newuidmap,newgidmap: New suid helpers for using subordinate uids and gids
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
This commit is contained in:
Eric W. Biederman
Serge Hallyn
parent
2cffa14105
commit
673c2a6f9a
@ -32,6 +32,8 @@ libmisc_a_SOURCES = \
|
|||||||
getgr_nam_gid.c \
|
getgr_nam_gid.c \
|
||||||
getrange.c \
|
getrange.c \
|
||||||
hushed.c \
|
hushed.c \
|
||||||
|
idmapping.h \
|
||||||
|
idmapping.c \
|
||||||
isexpired.c \
|
isexpired.c \
|
||||||
limits.c \
|
limits.c \
|
||||||
list.c log.c \
|
list.c log.c \
|
||||||
|
|||||||
126
libmisc/idmapping.c
Normal file
126
libmisc/idmapping.c
Normal file
@ -0,0 +1,126 @@
|
|||||||
|
/*
|
||||||
|
* Copyright (c) 2013 Eric Biederman
|
||||||
|
* 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. The name of the copyright holders or contributors may not be used to
|
||||||
|
* endorse or promote products derived from this software without
|
||||||
|
* specific prior written permission.
|
||||||
|
*
|
||||||
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
|
||||||
|
* HOLDERS 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.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include <config.h>
|
||||||
|
#include <sys/types.h>
|
||||||
|
#include <sys/stat.h>
|
||||||
|
#include <fcntl.h>
|
||||||
|
#include <limits.h>
|
||||||
|
#include <stdlib.h>
|
||||||
|
#include "prototypes.h"
|
||||||
|
#include "idmapping.h"
|
||||||
|
|
||||||
|
struct map_range *get_map_ranges(int ranges, int argc, char **argv)
|
||||||
|
{
|
||||||
|
struct map_range *mappings, *mapping;
|
||||||
|
int idx, argidx;
|
||||||
|
|
||||||
|
if ((ranges * 3) > argc) {
|
||||||
|
fprintf(stderr, "ranges: %u argc: %d\n",
|
||||||
|
ranges, argc);
|
||||||
|
fprintf(stderr,
|
||||||
|
_( "%s: Not enough arguments to form %u mappings\n"),
|
||||||
|
Prog, ranges);
|
||||||
|
return NULL;
|
||||||
|
}
|
||||||
|
|
||||||
|
mappings = calloc(ranges, sizeof(*mappings));
|
||||||
|
if (!mappings) {
|
||||||
|
fprintf(stderr, _( "%s: Memory allocation failure\n"),
|
||||||
|
Prog);
|
||||||
|
exit(EXIT_FAILURE);
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Gather up the ranges from the command line */
|
||||||
|
mapping = mappings;
|
||||||
|
for (idx = 0; idx < ranges; idx++, argidx += 3, mapping++) {
|
||||||
|
if (!getulong(argv[argidx + 0], &mapping->upper))
|
||||||
|
return NULL;
|
||||||
|
if (!getulong(argv[argidx + 1], &mapping->lower))
|
||||||
|
return NULL;
|
||||||
|
if (!getulong(argv[argidx + 2], &mapping->count))
|
||||||
|
return NULL;
|
||||||
|
}
|
||||||
|
return mappings;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Number of ascii digits needed to print any unsigned long in decimal.
|
||||||
|
* There are approximately 10 bits for every 3 decimal digits.
|
||||||
|
* So from bits to digits the formula is roundup((Number of bits)/10) * 3.
|
||||||
|
* For common sizes of integers this works out to:
|
||||||
|
* 2bytes --> 6 ascii estimate -> 65536 (5 real)
|
||||||
|
* 4bytes --> 12 ascii estimated -> 4294967296 (10 real)
|
||||||
|
* 8bytes --> 21 ascii estimated -> 18446744073709551616 (20 real)
|
||||||
|
* 16bytes --> 39 ascii estimated -> 340282366920938463463374607431768211456 (39 real)
|
||||||
|
*/
|
||||||
|
#define ULONG_DIGITS ((((sizeof(unsigned long) * CHAR_BIT) + 9)/10)*3)
|
||||||
|
|
||||||
|
|
||||||
|
void write_mapping(int proc_dir_fd, int ranges, struct map_range *mappings,
|
||||||
|
const char *map_file)
|
||||||
|
{
|
||||||
|
int idx;
|
||||||
|
struct map_range *mapping;
|
||||||
|
size_t bufsize;
|
||||||
|
char *buf, *pos;
|
||||||
|
int fd;
|
||||||
|
|
||||||
|
bufsize = ranges * ((ULONG_DIGITS + 1) * 3);
|
||||||
|
pos = buf = xmalloc(bufsize);
|
||||||
|
|
||||||
|
/* Build the mapping command */
|
||||||
|
mapping = mappings;
|
||||||
|
for (idx = 0; idx < ranges; idx++, mapping++) {
|
||||||
|
/* Append this range to the string that will be written */
|
||||||
|
int written = snprintf(pos, bufsize - (pos - buf),
|
||||||
|
"%lu %lu %lu\n",
|
||||||
|
mapping->upper,
|
||||||
|
mapping->lower,
|
||||||
|
mapping->count);
|
||||||
|
if ((written <= 0) || (written >= (bufsize - (pos - buf)))) {
|
||||||
|
fprintf(stderr, _("%s: snprintf failed!\n"), Prog);
|
||||||
|
exit(EXIT_FAILURE);
|
||||||
|
}
|
||||||
|
pos += written;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Write the mapping to the maping file */
|
||||||
|
fd = openat(proc_dir_fd, map_file, O_WRONLY);
|
||||||
|
if (fd < 0) {
|
||||||
|
fprintf(stderr, _("%s: open of %s failed: %s\n"),
|
||||||
|
Prog, map_file, strerror(errno));
|
||||||
|
exit(EXIT_FAILURE);
|
||||||
|
}
|
||||||
|
if (write(fd, buf, pos - buf) != (pos - buf)) {
|
||||||
|
fprintf(stderr, _("%s: write to %s failed: %s\n"),
|
||||||
|
Prog, map_file, strerror(errno));
|
||||||
|
exit(EXIT_FAILURE);
|
||||||
|
}
|
||||||
|
close(fd);
|
||||||
|
}
|
||||||
44
libmisc/idmapping.h
Normal file
44
libmisc/idmapping.h
Normal file
@ -0,0 +1,44 @@
|
|||||||
|
/*
|
||||||
|
* Copyright (c) 2013 Eric Biederman
|
||||||
|
* 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. The name of the copyright holders or contributors may not be used to
|
||||||
|
* endorse or promote products derived from this software without
|
||||||
|
* specific prior written permission.
|
||||||
|
*
|
||||||
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
|
||||||
|
* HOLDERS 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.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#ifndef _IDMAPPING_H_
|
||||||
|
#define _IDMAPPING_H_
|
||||||
|
|
||||||
|
struct map_range {
|
||||||
|
unsigned long upper;
|
||||||
|
unsigned long lower;
|
||||||
|
unsigned long count;
|
||||||
|
};
|
||||||
|
|
||||||
|
extern struct map_range *get_map_ranges(int ranges, int argc, char **argv);
|
||||||
|
extern void write_mapping(int proc_dir_fd, int ranges,
|
||||||
|
struct map_range *mappings, const char *map_file);
|
||||||
|
|
||||||
|
#endif /* _ID_MAPPING_H_ */
|
||||||
|
|
||||||
@ -30,7 +30,9 @@ man_MANS = \
|
|||||||
man1/login.1 \
|
man1/login.1 \
|
||||||
man5/login.defs.5 \
|
man5/login.defs.5 \
|
||||||
man8/logoutd.8 \
|
man8/logoutd.8 \
|
||||||
|
man1/newgidmap.1 \
|
||||||
man1/newgrp.1 \
|
man1/newgrp.1 \
|
||||||
|
man1/newuidmap.1 \
|
||||||
man8/newusers.8 \
|
man8/newusers.8 \
|
||||||
man8/nologin.8 \
|
man8/nologin.8 \
|
||||||
man1/passwd.1 \
|
man1/passwd.1 \
|
||||||
@ -83,7 +85,9 @@ man_XMANS = \
|
|||||||
login.access.5.xml \
|
login.access.5.xml \
|
||||||
login.defs.5.xml \
|
login.defs.5.xml \
|
||||||
logoutd.8.xml \
|
logoutd.8.xml \
|
||||||
|
newgidmap.1.xml \
|
||||||
newgrp.1.xml \
|
newgrp.1.xml \
|
||||||
|
newuidmap.1.xml \
|
||||||
newusers.8.xml \
|
newusers.8.xml \
|
||||||
nologin.8.xml \
|
nologin.8.xml \
|
||||||
passwd.1.xml \
|
passwd.1.xml \
|
||||||
|
|||||||
157
man/newgidmap.1.xml
Normal file
157
man/newgidmap.1.xml
Normal file
@ -0,0 +1,157 @@
|
|||||||
|
<?xml version="1.0" encoding="UTF-8"?>
|
||||||
|
<!--
|
||||||
|
Copyright (c) 2013 Eric W. Biederman
|
||||||
|
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. The name of the copyright holders or contributors may not be used to
|
||||||
|
endorse or promote products derived from this software without
|
||||||
|
specific prior written permission.
|
||||||
|
|
||||||
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
|
||||||
|
HOLDERS 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.
|
||||||
|
-->
|
||||||
|
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook V4.5//EN"
|
||||||
|
"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
|
||||||
|
<!-- SHADOW-CONFIG-HERE -->
|
||||||
|
]>
|
||||||
|
|
||||||
|
<refentry id='newgidmap.1'>
|
||||||
|
<refmeta>
|
||||||
|
<refentrytitle>newgidmap</refentrytitle>
|
||||||
|
<manvolnum>1</manvolnum>
|
||||||
|
<refmiscinfo class="sectdesc">User Commands</refmiscinfo>
|
||||||
|
<refmiscinfo class="source">shadow-utils</refmiscinfo>
|
||||||
|
<refmiscinfo class="version">&SHADOW_UTILS_VERSION;</refmiscinfo>
|
||||||
|
</refmeta>
|
||||||
|
<refnamediv id='name'>
|
||||||
|
<refname>newgidmap</refname>
|
||||||
|
<refpurpose>set the gid mapping of a user namespace</refpurpose>
|
||||||
|
</refnamediv>
|
||||||
|
|
||||||
|
<refsynopsisdiv id='synopsis'>
|
||||||
|
<cmdsynopsis>
|
||||||
|
<command>newgidmap</command>
|
||||||
|
<arg choice='plain'>
|
||||||
|
<replaceable>pid</replaceable>
|
||||||
|
</arg>
|
||||||
|
<arg choice='plain'>
|
||||||
|
<replaceable>gid</replaceable>
|
||||||
|
</arg>
|
||||||
|
<arg choice='plain'>
|
||||||
|
<replaceable>lowergid</replaceable>
|
||||||
|
</arg>
|
||||||
|
<arg choice='plain'>
|
||||||
|
<replaceable>count</replaceable>
|
||||||
|
</arg>
|
||||||
|
<arg choice='opt'>
|
||||||
|
<arg choice='plain'>
|
||||||
|
<replaceable>pid</replaceable>
|
||||||
|
</arg>
|
||||||
|
<arg choice='plain'>
|
||||||
|
<replaceable>gid</replaceable>
|
||||||
|
</arg>
|
||||||
|
<arg choice='plain'>
|
||||||
|
<replaceable>lowergid</replaceable>
|
||||||
|
</arg>
|
||||||
|
<arg choice='plain'>
|
||||||
|
<replaceable>count</replaceable>
|
||||||
|
</arg>
|
||||||
|
<arg choice='opt'>
|
||||||
|
<replaceable>...</replaceable>
|
||||||
|
</arg>
|
||||||
|
</arg>
|
||||||
|
</cmdsynopsis>
|
||||||
|
</refsynopsisdiv>
|
||||||
|
|
||||||
|
<refsect1 id='description'>
|
||||||
|
<title>DESCRIPTION</title>
|
||||||
|
<para>
|
||||||
|
The <command>newgidmap</command> sets <filename>/proc/[pid]/gid_map</filename> based on it's
|
||||||
|
command line arguments and the gids allowed in <filename>/etc/subgid</filename>.
|
||||||
|
</para>
|
||||||
|
|
||||||
|
</refsect1>
|
||||||
|
|
||||||
|
<refsect1 id='options'>
|
||||||
|
<title>OPTIONS</title>
|
||||||
|
<para>
|
||||||
|
There currently are no options to the <command>newgidmap</command> command.
|
||||||
|
</para>
|
||||||
|
<variablelist remap='IP'>
|
||||||
|
</variablelist>
|
||||||
|
</refsect1>
|
||||||
|
|
||||||
|
<refsect1 id='note'>
|
||||||
|
<title>NOTE</title>
|
||||||
|
<para>
|
||||||
|
The only restriction placed on the login shell is that the command
|
||||||
|
name must be listed in <filename>/etc/shells</filename>, unless the
|
||||||
|
invoker is the superuser, and then any value may be added. An
|
||||||
|
account with a restricted login shell may not change her login shell.
|
||||||
|
For this reason, placing <filename>/bin/rsh</filename> in
|
||||||
|
<filename>/etc/shells</filename> is discouraged since accidentally
|
||||||
|
changing to a restricted shell would prevent the user from ever
|
||||||
|
changing her login shell back to its original value.
|
||||||
|
</para>
|
||||||
|
</refsect1>
|
||||||
|
|
||||||
|
|
||||||
|
<refsect1 id='files'>
|
||||||
|
<title>FILES</title>
|
||||||
|
<variablelist>
|
||||||
|
<varlistentry>
|
||||||
|
<term><filename>/etc/subgid</filename></term>
|
||||||
|
<listitem>
|
||||||
|
<para>List of users subordinate user IDs.</para>
|
||||||
|
</listitem>
|
||||||
|
</varlistentry>
|
||||||
|
<varlistentry>
|
||||||
|
<term><filename>/proc/[pid]/gid_map</filename></term>
|
||||||
|
<listitem>
|
||||||
|
<para>Mapping of gids from one between user namespaces.</para>
|
||||||
|
</listitem>
|
||||||
|
</varlistentry>
|
||||||
|
</variablelist>
|
||||||
|
</refsect1>
|
||||||
|
|
||||||
|
<refsect1 id='see_also'>
|
||||||
|
<title>SEE ALSO</title>
|
||||||
|
<para>
|
||||||
|
<citerefentry>
|
||||||
|
<refentrytitle>login.defs</refentrytitle><manvolnum>5</manvolnum>
|
||||||
|
</citerefentry>,
|
||||||
|
<citerefentry>
|
||||||
|
<refentrytitle>useradd</refentrytitle><manvolnum>8</manvolnum>
|
||||||
|
</citerefentry>,
|
||||||
|
<citerefentry>
|
||||||
|
<refentrytitle>usermod</refentrytitle><manvolnum>8</manvolnum>
|
||||||
|
</citerefentry>,
|
||||||
|
<citerefentry>
|
||||||
|
<refentrytitle>newusers</refentrytitle><manvolnum>8</manvolnum>
|
||||||
|
</citerefentry>,
|
||||||
|
<citerefentry>
|
||||||
|
<refentrytitle>userdel</refentrytitle><manvolnum>8</manvolnum>
|
||||||
|
</citerefentry>,
|
||||||
|
<citerefentry>
|
||||||
|
<refentrytitle>subgid</refentrytitle><manvolnum>5</manvolnum>
|
||||||
|
</citerefentry>.
|
||||||
|
</para>
|
||||||
|
</refsect1>
|
||||||
|
</refentry>
|
||||||
154
man/newuidmap.1.xml
Normal file
154
man/newuidmap.1.xml
Normal file
@ -0,0 +1,154 @@
|
|||||||
|
<?xml version="1.0" encoding="UTF-8"?>
|
||||||
|
<!--
|
||||||
|
Copyright (c) 2013 Eric W. Biederman
|
||||||
|
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. The name of the copyright holders or contributors may not be used to
|
||||||
|
endorse or promote products derived from this software without
|
||||||
|
specific prior written permission.
|
||||||
|
|
||||||
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
|
||||||
|
HOLDERS 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.
|
||||||
|
-->
|
||||||
|
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook V4.5//EN"
|
||||||
|
"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
|
||||||
|
<!-- SHADOW-CONFIG-HERE -->
|
||||||
|
]>
|
||||||
|
|
||||||
|
<refentry id='newuidmap.1'>
|
||||||
|
<refmeta>
|
||||||
|
<refentrytitle>newuidmap</refentrytitle>
|
||||||
|
<manvolnum>1</manvolnum>
|
||||||
|
<refmiscinfo class="sectdesc">User Commands</refmiscinfo>
|
||||||
|
<refmiscinfo class="source">shadow-utils</refmiscinfo>
|
||||||
|
<refmiscinfo class="version">&SHADOW_UTILS_VERSION;</refmiscinfo>
|
||||||
|
</refmeta>
|
||||||
|
<refnamediv id='name'>
|
||||||
|
<refname>newuidmap</refname>
|
||||||
|
<refpurpose>set the uid mapping of a user namespace</refpurpose>
|
||||||
|
</refnamediv>
|
||||||
|
|
||||||
|
<refsynopsisdiv id='synopsis'>
|
||||||
|
<cmdsynopsis>
|
||||||
|
<command>newuidmap</command>
|
||||||
|
<arg choice='plain'>
|
||||||
|
<replaceable>pid</replaceable>
|
||||||
|
</arg>
|
||||||
|
<arg choice='plain'>
|
||||||
|
<replaceable>uid</replaceable>
|
||||||
|
</arg>
|
||||||
|
<arg choice='plain'>
|
||||||
|
<replaceable>loweruid</replaceable>
|
||||||
|
</arg>
|
||||||
|
<arg choice='plain'>
|
||||||
|
<replaceable>count</replaceable>
|
||||||
|
</arg>
|
||||||
|
<arg choice='opt'>
|
||||||
|
<arg choice='plain'>
|
||||||
|
<replaceable>uid</replaceable>
|
||||||
|
</arg>
|
||||||
|
<arg choice='plain'>
|
||||||
|
<replaceable>loweruid</replaceable>
|
||||||
|
</arg>
|
||||||
|
<arg choice='plain'>
|
||||||
|
<replaceable>count</replaceable>
|
||||||
|
</arg>
|
||||||
|
<arg choice='opt'>
|
||||||
|
<replaceable>...</replaceable>
|
||||||
|
</arg>
|
||||||
|
</arg>
|
||||||
|
</cmdsynopsis>
|
||||||
|
</refsynopsisdiv>
|
||||||
|
|
||||||
|
<refsect1 id='description'>
|
||||||
|
<title>DESCRIPTION</title>
|
||||||
|
<para>
|
||||||
|
The <command>newuidmap</command> sets <filename>/proc/[pid]/uid_map</filename> based on it's
|
||||||
|
command line arguments and the uids allowed in <filename>/etc/subuid</filename>.
|
||||||
|
</para>
|
||||||
|
|
||||||
|
</refsect1>
|
||||||
|
|
||||||
|
<refsect1 id='options'>
|
||||||
|
<title>OPTIONS</title>
|
||||||
|
<para>
|
||||||
|
There currently are no options to the <command>newuidmap</command> command.
|
||||||
|
</para>
|
||||||
|
<variablelist remap='IP'>
|
||||||
|
</variablelist>
|
||||||
|
</refsect1>
|
||||||
|
|
||||||
|
<refsect1 id='note'>
|
||||||
|
<title>NOTE</title>
|
||||||
|
<para>
|
||||||
|
The only restriction placed on the login shell is that the command
|
||||||
|
name must be listed in <filename>/etc/shells</filename>, unless the
|
||||||
|
invoker is the superuser, and then any value may be added. An
|
||||||
|
account with a restricted login shell may not change her login shell.
|
||||||
|
For this reason, placing <filename>/bin/rsh</filename> in
|
||||||
|
<filename>/etc/shells</filename> is discouraged since accidentally
|
||||||
|
changing to a restricted shell would prevent the user from ever
|
||||||
|
changing her login shell back to its original value.
|
||||||
|
</para>
|
||||||
|
</refsect1>
|
||||||
|
|
||||||
|
|
||||||
|
<refsect1 id='files'>
|
||||||
|
<title>FILES</title>
|
||||||
|
<variablelist>
|
||||||
|
<varlistentry>
|
||||||
|
<term><filename>/etc/subuid</filename></term>
|
||||||
|
<listitem>
|
||||||
|
<para>List of users subordinate user IDs.</para>
|
||||||
|
</listitem>
|
||||||
|
</varlistentry>
|
||||||
|
<varlistentry>
|
||||||
|
<term><filename>/proc/[pid]/uid_map</filename></term>
|
||||||
|
<listitem>
|
||||||
|
<para>Mapping of uids from one between user namespaces.</para>
|
||||||
|
</listitem>
|
||||||
|
</varlistentry>
|
||||||
|
</variablelist>
|
||||||
|
</refsect1>
|
||||||
|
|
||||||
|
<refsect1 id='see_also'>
|
||||||
|
<title>SEE ALSO</title>
|
||||||
|
<para>
|
||||||
|
<citerefentry>
|
||||||
|
<refentrytitle>login.defs</refentrytitle><manvolnum>5</manvolnum>
|
||||||
|
</citerefentry>,
|
||||||
|
<citerefentry>
|
||||||
|
<refentrytitle>useradd</refentrytitle><manvolnum>8</manvolnum>
|
||||||
|
</citerefentry>,
|
||||||
|
<citerefentry>
|
||||||
|
<refentrytitle>usermod</refentrytitle><manvolnum>8</manvolnum>
|
||||||
|
</citerefentry>,
|
||||||
|
<citerefentry>
|
||||||
|
<refentrytitle>newusers</refentrytitle><manvolnum>8</manvolnum>
|
||||||
|
</citerefentry>,
|
||||||
|
<citerefentry>
|
||||||
|
<refentrytitle>userdel</refentrytitle><manvolnum>8</manvolnum>
|
||||||
|
</citerefentry>,
|
||||||
|
<citerefentry>
|
||||||
|
<refentrytitle>subuid</refentrytitle><manvolnum>5</manvolnum>
|
||||||
|
</citerefentry>.
|
||||||
|
</para>
|
||||||
|
</refsect1>
|
||||||
|
</refentry>
|
||||||
@ -24,7 +24,8 @@ INCLUDES = \
|
|||||||
|
|
||||||
bin_PROGRAMS = groups login su
|
bin_PROGRAMS = groups login su
|
||||||
sbin_PROGRAMS = nologin
|
sbin_PROGRAMS = nologin
|
||||||
ubin_PROGRAMS = faillog lastlog chage chfn chsh expiry gpasswd newgrp passwd
|
ubin_PROGRAMS = faillog lastlog chage chfn chsh expiry gpasswd newgrp passwd \
|
||||||
|
newgidmap newuidmap
|
||||||
usbin_PROGRAMS = \
|
usbin_PROGRAMS = \
|
||||||
chgpasswd \
|
chgpasswd \
|
||||||
chpasswd \
|
chpasswd \
|
||||||
@ -49,7 +50,7 @@ usbin_PROGRAMS = \
|
|||||||
noinst_PROGRAMS = id sulogin
|
noinst_PROGRAMS = id sulogin
|
||||||
|
|
||||||
suidbins = su
|
suidbins = su
|
||||||
suidubins = chage chfn chsh expiry gpasswd newgrp passwd
|
suidubins = chage chfn chsh expiry gpasswd newgrp passwd newuidmap newgidmap
|
||||||
if ACCT_TOOLS_SETUID
|
if ACCT_TOOLS_SETUID
|
||||||
suidubins += chage chgpasswd chpasswd groupadd groupdel groupmod newusers useradd userdel usermod
|
suidubins += chage chgpasswd chpasswd groupadd groupdel groupmod newusers useradd userdel usermod
|
||||||
endif
|
endif
|
||||||
|
|||||||
183
src/newgidmap.c
Normal file
183
src/newgidmap.c
Normal file
@ -0,0 +1,183 @@
|
|||||||
|
/*
|
||||||
|
* Copyright (c) 2013 Eric Biederman
|
||||||
|
* 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. The name of the copyright holders or contributors may not be used to
|
||||||
|
* endorse or promote products derived from this software without
|
||||||
|
* specific prior written permission.
|
||||||
|
*
|
||||||
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
|
||||||
|
* HOLDERS 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.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include <config.h>
|
||||||
|
#include <stdio.h>
|
||||||
|
#include <string.h>
|
||||||
|
#include <errno.h>
|
||||||
|
#include <stdbool.h>
|
||||||
|
#include <stdlib.h>
|
||||||
|
#include <sys/types.h>
|
||||||
|
#include <sys/stat.h>
|
||||||
|
#include <fcntl.h>
|
||||||
|
#include "defines.h"
|
||||||
|
#include "prototypes.h"
|
||||||
|
#include "subordinateio.h"
|
||||||
|
#include "idmapping.h"
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Global variables
|
||||||
|
*/
|
||||||
|
const char *Prog;
|
||||||
|
|
||||||
|
static bool verify_range(struct passwd *pw, struct map_range *range)
|
||||||
|
{
|
||||||
|
/* An empty range is invalid */
|
||||||
|
if (range->count == 0)
|
||||||
|
return false;
|
||||||
|
|
||||||
|
/* Test /etc/subgid */
|
||||||
|
if (have_sub_gids(pw->pw_name, range->lower, range->count))
|
||||||
|
return true;
|
||||||
|
|
||||||
|
/* Allow a process to map it's own gid */
|
||||||
|
if ((range->count == 1) && (pw->pw_gid == range->lower))
|
||||||
|
return true;
|
||||||
|
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
|
||||||
|
static void verify_ranges(struct passwd *pw, int ranges,
|
||||||
|
struct map_range *mappings)
|
||||||
|
{
|
||||||
|
struct map_range *mapping;
|
||||||
|
int idx;
|
||||||
|
|
||||||
|
mapping = mappings;
|
||||||
|
for (idx = 0; idx < ranges; idx++, mapping++) {
|
||||||
|
if (!verify_range(pw, mapping)) {
|
||||||
|
fprintf(stderr, _( "%s: gid range [%lu-%lu) -> [%lu-%lu) not allowed\n"),
|
||||||
|
Prog,
|
||||||
|
mapping->upper,
|
||||||
|
mapping->upper + mapping->count,
|
||||||
|
mapping->lower,
|
||||||
|
mapping->lower + mapping->count);
|
||||||
|
exit(EXIT_FAILURE);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
static void usage(void)
|
||||||
|
{
|
||||||
|
fprintf(stderr, _("usage: %s <pid> <gid> <lowergid> <count> [ <gid> <lowergid> <count> ] ... \n"), Prog);
|
||||||
|
exit(EXIT_FAILURE);
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* newgidmap - Set the gid_map for the specified process
|
||||||
|
*/
|
||||||
|
int main(int argc, char **argv)
|
||||||
|
{
|
||||||
|
char proc_dir_name[PATH_MAX];
|
||||||
|
char *target_str;
|
||||||
|
pid_t target, parent;
|
||||||
|
int proc_dir_fd;
|
||||||
|
int ranges;
|
||||||
|
struct map_range *mappings;
|
||||||
|
struct stat st;
|
||||||
|
struct passwd *pw;
|
||||||
|
int written;
|
||||||
|
|
||||||
|
Prog = Basename (argv[0]);
|
||||||
|
|
||||||
|
/*
|
||||||
|
* The valid syntax are
|
||||||
|
* newgidmap target_pid
|
||||||
|
*/
|
||||||
|
if (argc < 2)
|
||||||
|
usage();
|
||||||
|
|
||||||
|
/* Find the process that needs it's user namespace
|
||||||
|
* gid mapping set.
|
||||||
|
*/
|
||||||
|
target_str = argv[1];
|
||||||
|
if (!get_pid(target_str, &target))
|
||||||
|
usage();
|
||||||
|
|
||||||
|
written = snprintf(proc_dir_name, sizeof(proc_dir_name), "/proc/%u/",
|
||||||
|
target);
|
||||||
|
if ((written <= 0) || (written >= sizeof(proc_dir_name))) {
|
||||||
|
fprintf(stderr, "%s: snprintf of proc path failed: %s\n",
|
||||||
|
Prog, strerror(errno));
|
||||||
|
}
|
||||||
|
|
||||||
|
proc_dir_fd = open(proc_dir_name, O_DIRECTORY);
|
||||||
|
if (proc_dir_fd < 0) {
|
||||||
|
fprintf(stderr, _("%s: Could not open proc directory for target %u\n"),
|
||||||
|
Prog, target);
|
||||||
|
return EXIT_FAILURE;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Who am i? */
|
||||||
|
pw = get_my_pwent ();
|
||||||
|
if (NULL == pw) {
|
||||||
|
fprintf (stderr,
|
||||||
|
_("%s: Cannot determine your user name.\n"),
|
||||||
|
Prog);
|
||||||
|
SYSLOG ((LOG_WARN, "Cannot determine the user name of the caller (UID %lu)",
|
||||||
|
(unsigned long) getuid ()));
|
||||||
|
return EXIT_FAILURE;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Get the effective uid and effective gid of the target process */
|
||||||
|
if (fstat(proc_dir_fd, &st) < 0) {
|
||||||
|
fprintf(stderr, _("%s: Could not stat directory for target %u\n"),
|
||||||
|
Prog, target);
|
||||||
|
return EXIT_FAILURE;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Verify real user and real group matches the password entry
|
||||||
|
* and the effective user and group of the program whose
|
||||||
|
* mappings we have been asked to set.
|
||||||
|
*/
|
||||||
|
if ((getuid() != pw->pw_uid) ||
|
||||||
|
(getgid() != pw->pw_gid) ||
|
||||||
|
(pw->pw_uid != st.st_uid) ||
|
||||||
|
(pw->pw_gid != st.st_gid)) {
|
||||||
|
fprintf(stderr, _( "%s: Target %u is owned by a different user\n" ),
|
||||||
|
Prog, target);
|
||||||
|
return EXIT_FAILURE;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (!sub_gid_open(O_RDONLY)) {
|
||||||
|
return EXIT_FAILURE;
|
||||||
|
}
|
||||||
|
|
||||||
|
ranges = ((argc - 2) + 2) / 3;
|
||||||
|
mappings = get_map_ranges(ranges, argc - 2, argv + 2);
|
||||||
|
if (!mappings)
|
||||||
|
usage();
|
||||||
|
|
||||||
|
verify_ranges(pw, ranges, mappings);
|
||||||
|
|
||||||
|
write_mapping(proc_dir_fd, ranges, mappings, "gid_map");
|
||||||
|
sub_gid_close();
|
||||||
|
|
||||||
|
return EXIT_SUCCESS;
|
||||||
|
}
|
||||||
183
src/newuidmap.c
Normal file
183
src/newuidmap.c
Normal file
@ -0,0 +1,183 @@
|
|||||||
|
/*
|
||||||
|
* Copyright (c) 2013 Eric Biederman
|
||||||
|
* 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. The name of the copyright holders or contributors may not be used to
|
||||||
|
* endorse or promote products derived from this software without
|
||||||
|
* specific prior written permission.
|
||||||
|
*
|
||||||
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
|
||||||
|
* HOLDERS 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.
|
||||||
|
*/
|
||||||
|
|
||||||
|
#include <config.h>
|
||||||
|
#include <stdio.h>
|
||||||
|
#include <string.h>
|
||||||
|
#include <errno.h>
|
||||||
|
#include <stdbool.h>
|
||||||
|
#include <stdlib.h>
|
||||||
|
#include <sys/types.h>
|
||||||
|
#include <sys/stat.h>
|
||||||
|
#include <fcntl.h>
|
||||||
|
#include "defines.h"
|
||||||
|
#include "prototypes.h"
|
||||||
|
#include "subordinateio.h"
|
||||||
|
#include "idmapping.h"
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Global variables
|
||||||
|
*/
|
||||||
|
const char *Prog;
|
||||||
|
|
||||||
|
static bool verify_range(struct passwd *pw, struct map_range *range)
|
||||||
|
{
|
||||||
|
/* An empty range is invalid */
|
||||||
|
if (range->count == 0)
|
||||||
|
return false;
|
||||||
|
|
||||||
|
/* Test /etc/subuid */
|
||||||
|
if (have_sub_uids(pw->pw_name, range->lower, range->count))
|
||||||
|
return true;
|
||||||
|
|
||||||
|
/* Allow a process to map it's own uid */
|
||||||
|
if ((range->count == 1) && (pw->pw_uid == range->lower))
|
||||||
|
return true;
|
||||||
|
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
|
||||||
|
static void verify_ranges(struct passwd *pw, int ranges,
|
||||||
|
struct map_range *mappings)
|
||||||
|
{
|
||||||
|
struct map_range *mapping;
|
||||||
|
int idx;
|
||||||
|
|
||||||
|
mapping = mappings;
|
||||||
|
for (idx = 0; idx < ranges; idx++, mapping++) {
|
||||||
|
if (!verify_range(pw, mapping)) {
|
||||||
|
fprintf(stderr, _( "%s: uid range [%lu-%lu) -> [%lu-%lu) not allowed\n"),
|
||||||
|
Prog,
|
||||||
|
mapping->upper,
|
||||||
|
mapping->upper + mapping->count,
|
||||||
|
mapping->lower,
|
||||||
|
mapping->lower + mapping->count);
|
||||||
|
exit(EXIT_FAILURE);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
void usage(void)
|
||||||
|
{
|
||||||
|
fprintf(stderr, _("usage: %s <pid> <uid> <loweruid> <count> [ <uid> <loweruid> <count> ] ... \n"), Prog);
|
||||||
|
exit(EXIT_FAILURE);
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* newuidmap - Set the uid_map for the specified process
|
||||||
|
*/
|
||||||
|
int main(int argc, char **argv)
|
||||||
|
{
|
||||||
|
char proc_dir_name[PATH_MAX];
|
||||||
|
char *target_str;
|
||||||
|
pid_t target, parent;
|
||||||
|
int proc_dir_fd;
|
||||||
|
int ranges;
|
||||||
|
struct map_range *mappings;
|
||||||
|
struct stat st;
|
||||||
|
struct passwd *pw;
|
||||||
|
int written;
|
||||||
|
|
||||||
|
Prog = Basename (argv[0]);
|
||||||
|
|
||||||
|
/*
|
||||||
|
* The valid syntax are
|
||||||
|
* newuidmap target_pid
|
||||||
|
*/
|
||||||
|
if (argc < 2)
|
||||||
|
usage();
|
||||||
|
|
||||||
|
/* Find the process that needs it's user namespace
|
||||||
|
* uid mapping set.
|
||||||
|
*/
|
||||||
|
target_str = argv[1];
|
||||||
|
if (!get_pid(target_str, &target))
|
||||||
|
usage();
|
||||||
|
|
||||||
|
written = snprintf(proc_dir_name, sizeof(proc_dir_name), "/proc/%u/",
|
||||||
|
target);
|
||||||
|
if ((written <= 0) || (written >= sizeof(proc_dir_name))) {
|
||||||
|
fprintf(stderr, "%s: snprintf of proc path failed: %s\n",
|
||||||
|
Prog, strerror(errno));
|
||||||
|
}
|
||||||
|
|
||||||
|
proc_dir_fd = open(proc_dir_name, O_DIRECTORY);
|
||||||
|
if (proc_dir_fd < 0) {
|
||||||
|
fprintf(stderr, _("%s: Could not open proc directory for target %u\n"),
|
||||||
|
Prog, target);
|
||||||
|
return EXIT_FAILURE;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Who am i? */
|
||||||
|
pw = get_my_pwent ();
|
||||||
|
if (NULL == pw) {
|
||||||
|
fprintf (stderr,
|
||||||
|
_("%s: Cannot determine your user name.\n"),
|
||||||
|
Prog);
|
||||||
|
SYSLOG ((LOG_WARN, "Cannot determine the user name of the caller (UID %lu)",
|
||||||
|
(unsigned long) getuid ()));
|
||||||
|
return EXIT_FAILURE;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Get the effective uid and effective gid of the target process */
|
||||||
|
if (fstat(proc_dir_fd, &st) < 0) {
|
||||||
|
fprintf(stderr, _("%s: Could not stat directory for target %u\n"),
|
||||||
|
Prog, target);
|
||||||
|
return EXIT_FAILURE;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Verify real user and real group matches the password entry
|
||||||
|
* and the effective user and group of the program whose
|
||||||
|
* mappings we have been asked to set.
|
||||||
|
*/
|
||||||
|
if ((getuid() != pw->pw_uid) ||
|
||||||
|
(getgid() != pw->pw_gid) ||
|
||||||
|
(pw->pw_uid != st.st_uid) ||
|
||||||
|
(pw->pw_gid != st.st_gid)) {
|
||||||
|
fprintf(stderr, _( "%s: Target %u is owned by a different user\n" ),
|
||||||
|
Prog, target);
|
||||||
|
return EXIT_FAILURE;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (!sub_uid_open(O_RDONLY)) {
|
||||||
|
return EXIT_FAILURE;
|
||||||
|
}
|
||||||
|
|
||||||
|
ranges = ((argc - 2) + 2) / 3;
|
||||||
|
mappings = get_map_ranges(ranges, argc - 2, argv + 2);
|
||||||
|
if (!mappings)
|
||||||
|
usage();
|
||||||
|
|
||||||
|
verify_ranges(pw, ranges, mappings);
|
||||||
|
|
||||||
|
write_mapping(proc_dir_fd, ranges, mappings, "uid_map");
|
||||||
|
sub_uid_close();
|
||||||
|
|
||||||
|
return EXIT_SUCCESS;
|
||||||
|
}
|
||||||
Loading…
Reference in New Issue
Block a user