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Add getpeereid function

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This commit is contained in:
Guillem Jover 2010-12-17 10:50:56 +01:00
parent acb7c42d7c
commit 5b19adfa82
5 changed files with 275 additions and 0 deletions
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2
Makefile
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@ -26,6 +26,7 @@ LIB_SRCS := \
err.c \
fgetln.c \
flopen.c \
getpeereid.c \
heapsort.c \
humanize_number.c \
dehumanize_number.c \
@ -84,6 +85,7 @@ LIB_MANS := \
strlcat.3 \
fgetln.3 \
flopen.3 \
getpeereid.3 \
readpassphrase.3 \
reallocf.3 \
humanize_number.3 \

1
Versions
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@ -67,5 +67,6 @@ LIBBSD_0.2 {
LIBBSD_0.3 {
reallocf;
getpeereid;
} LIBBSD_0.2;

2
include/bsd/unistd.h
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@ -39,6 +39,8 @@ mode_t getmode(const void *set, mode_t mode);
void *setmode(const char *mode_str);
void setproctitle(const char *fmt, ...);
int getpeereid(int s, uid_t *euid, gid_t *egid);
__END_DECLS
#endif

138
src/getpeereid.3 Normal file
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@ -0,0 +1,138 @@
.\"
.\" Copyright (c) 2001 Dima Dorfman.
.\" 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.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
.\"
.\" $FreeBSD$
.\"
.Dd July 15, 2001
.Dt GETPEEREID 3
.Os
.Sh NAME
.Nm getpeereid
.Nd get the effective credentials of a UNIX-domain peer
.Sh LIBRARY
.ds str-Lb-libbsd Utility functions from BSD systems (libbsd, \-lbsd)
.Lb libbsd
.Sh SYNOPSIS
.In sys/types.h
.In unistd.h
.Ft int
.Fn getpeereid "int s" "uid_t *euid" "gid_t *egid"
.Sh DESCRIPTION
The
.Fn getpeereid
function returns the effective user and group IDs of the
peer connected to a
.Ux Ns -domain
socket.
The argument
.Fa s
must be a
.Ux Ns -domain
socket
.Pq Xr unix 4
of type
.Dv SOCK_STREAM
on which either
.Xr connect 2
or
.Xr listen 2
have been called.
The effective used ID is placed in
.Fa euid ,
and the effective group ID in
.Fa egid .
.Pp
The credentials returned to the
.Xr listen 2
caller are those of its peer at the time it called
.Xr connect 2 ;
the credentials returned to the
.Xr connect 2
caller are those of its peer at the time it called
.Xr listen 2 .
This mechanism is reliable; there is no way for either side to influence
the credentials returned to its peer except by calling the appropriate
system call (i.e., either
.Xr connect 2
or
.Xr listen 2 )
under different effective credentials.
.Pp
One common use of this routine is for a
.Ux Ns -domain
server
to verify the credentials of its client.
Likewise, the client can verify the credentials of the server.
.Sh IMPLEMENTATION NOTES
On
.Fx ,
.Fn getpeereid
is implemented in terms of the
.Dv LOCAL_PEERCRED
.Xr unix 4
socket option.
.Sh RETURN VALUES
.Rv -std getpeereid
.Sh ERRORS
The
.Fn getpeereid
function
fails if:
.Bl -tag -width Er
.It Bq Er EBADF
The argument
.Fa s
is not a valid descriptor.
.It Bq Er ENOTSOCK
The argument
.Fa s
is a file, not a socket.
.It Bq Er ENOTCONN
The argument
.Fa s
does not refer to a socket on which
.Xr connect 2
or
.Xr listen 2
have been called.
.It Bq Er EINVAL
The argument
.Fa s
does not refer to a socket of type
.Dv SOCK_STREAM ,
or the kernel returned invalid data.
.El
.Sh SEE ALSO
.Xr connect 2 ,
.Xr getpeername 2 ,
.Xr getsockname 2 ,
.Xr getsockopt 2 ,
.Xr listen 2 ,
.Xr unix 4
.Sh HISTORY
The
.Fn getpeereid
function appeared in
.Fx 4.6 .

132
src/getpeereid.c Normal file
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@ -0,0 +1,132 @@
/*
* Copyright © 2010 Guillem Jover
*
* 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. The name of the author 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 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 AUTHOR 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.
*/
#include <sys/cdefs.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <errno.h>
#include <unistd.h>
#if defined(SO_PEERCRED)
/* Linux and OpenBSD */
int
getpeereid(int s, uid_t *euid, gid_t *egid)
{
/* XXX: This should be autodetected at build time instead. */
#if defined(__linux__)
struct ucred cred;
#elif defined(__OpenBSD__)
struct sockpeercred cred;
#endif
socklen_t credlen = sizeof(cred);
int ret;
ret = getsockopt(s, SOL_SOCKET, SO_PEERCRED, &cred, &credlen);
if (ret != 0)
return ret;
*euid = cred.uid;
*egid = cred.gid;
return 0;
}
#elif defined(LOCAL_PEERCRED)
/* FreeBSD */
#include <sys/ucred.h>
int
getpeereid(int s, uid_t *euid, gid_t *egid)
{
struct xucred cred;
socklen_t credlen = sizeof(cred);
int ret;
ret = getsockopt(s, 0, LOCAL_PEERCRED, &cred, &credlen);
if (ret != 0)
return ret;
if (cred.cr_version != XUCRED_VERSION)
return EINVAL;
*euid = cred.cr_uid;
*egid = cred.cr_gid;
return 0;
}
#elif defined(LOCAL_PEEREID)
/* NetBSD */
int
getpeereid(int s, uid_t *euid, gid_t *egid)
{
struct unpcbid cred;
socklen_t credlen = sizeof(cred);
int ret;
ret = getsockopt(s, 0, LOCAL_PEEREID, &cred, &credlen);
if (ret != 0)
return ret;
*euid = cred.unp_euid;
*egid = cred.unp_egid;
return 0;
}
#elif defined(__sun)
/* Solaris */
int
getpeereid(int s, uid_t *euid, gid_t *egid)
{
ucred_t cred_inst;
ucred_t *cred = &cred_inst;
int ret;
ret = getpeerucred(s, &cred);
if (ret != 0)
return ret;
*euid = ucred_geteuid(cred);
if (*euid < 0)
return -1;
*egid = ucred_getegid(cred);
if (*egid < 0)
return -1;
return 0;
}
#else
#warning "This platform needs an implementation of getpeereid()"
int
getpeereid(int s, uid_t *euid, gid_t *egid)
{
*euid = geteuid();
*egid = getegid();
return 0;
}
#endif