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Implement find_new_sub_uids find_new_sub_gids

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Functions for finding new subordinate uid and gids ranges for use
with useradd.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman
2013-01-22 01:15:05 -08:00
committed by Serge Hallyn
parent f28ad4b251
commit a8f26262cf
4 changed files with 185 additions and 0 deletions
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9
lib/prototypes.h
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@@ -149,6 +149,15 @@ extern int find_new_uid (bool sys_user,
uid_t *uid,
/*@null@*/uid_t const *preferred_uid);
/* find_new_sub_gids.c */
extern int find_new_sub_gids (const char *owner,
gid_t *range_start, unsigned long *range_count);
/* find_new_sub_uids.c */
extern int find_new_sub_uids (const char *owner,
uid_t *range_start, unsigned long *range_count);
/* get_gid.c */
extern int get_gid (const char *gidstr, gid_t *gid);

2
libmisc/Makefile.am
View File

@@ -25,6 +25,8 @@ libmisc_a_SOURCES = \
failure.h \
find_new_gid.c \
find_new_uid.c \
find_new_sub_gids.c \
find_new_sub_uids.c \
getdate.h \
getdate.y \
getgr_nam_gid.c \

87
libmisc/find_new_sub_gids.c Normal file
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@@ -0,0 +1,87 @@
/*
* Copyright (c) 2012 Eric Biederman
*
* 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 <assert.h>
#include <stdio.h>
#include <errno.h>
#include "prototypes.h"
#include "subordinateio.h"
#include "getdef.h"
/*
* find_new_sub_gids - Find a new unused range of GIDs.
*
* If successful, find_new_sub_gids provides a range of unused
* user IDs in the [SUB_GID_MIN:SUB_GID_MAX] range.
*
* Return 0 on success, -1 if no unused GIDs are available.
*/
int find_new_sub_gids (const char *owner,
gid_t *range_start, unsigned long *range_count)
{
unsigned long min, max;
unsigned long count;
gid_t start;
assert (range_start != NULL);
assert (range_count != NULL);
min = getdef_ulong ("SUB_GID_MIN", 100000UL);
max = getdef_ulong ("SUB_GID_MAX", 600100000UL);
count = getdef_ulong ("SUB_GID_COUNT", 10000);
/* Is there a preferred range that works? */
if ((*range_count != 0) &&
(*range_start >= min) &&
(((*range_start) + (*range_count) - 1) <= max) &&
is_sub_gid_range_free(*range_start, *range_count)) {
return 0;
}
if (max < (min + count)) {
(void) fprintf (stderr,
_("%s: Invalid configuration: SUB_GID_MIN (%lu), SUB_GID_MAX (%lu)\n"),
Prog, min, max);
return -1;
}
start = sub_gid_find_free_range(min, max, count);
if (start == (gid_t)-1) {
fprintf (stderr,
_("%s: Can't get unique secondary GID range\n"),
Prog);
SYSLOG ((LOG_WARN, "no more available secondary GIDs on the system"));
return -1;
}
*range_start = start;
*range_count = count;
return 0;
}

87
libmisc/find_new_sub_uids.c Normal file
View File

@@ -0,0 +1,87 @@
/*
* Copyright (c) 2012 Eric Biederman
*
* 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 <assert.h>
#include <stdio.h>
#include <errno.h>
#include "prototypes.h"
#include "subordinateio.h"
#include "getdef.h"
/*
* find_new_sub_uids - Find a new unused range of UIDs.
*
* If successful, find_new_sub_uids provides a range of unused
* user IDs in the [SUB_UID_MIN:SUB_UID_MAX] range.
*
* Return 0 on success, -1 if no unused UIDs are available.
*/
int find_new_sub_uids (const char *owner,
uid_t *range_start, unsigned long *range_count)
{
unsigned long min, max;
unsigned long count;
uid_t start;
assert (range_start != NULL);
assert (range_count != NULL);
min = getdef_ulong ("SUB_UID_MIN", 100000UL);
max = getdef_ulong ("SUB_UID_MAX", 600100000UL);
count = getdef_ulong ("SUB_UID_COUNT", 10000);
/* Is there a preferred range that works? */
if ((*range_count != 0) &&
(*range_start >= min) &&
(((*range_start) + (*range_count) - 1) <= max) &&
is_sub_uid_range_free(*range_start, *range_count)) {
return 0;
}
if (max < (min + count)) {
(void) fprintf (stderr,
_("%s: Invalid configuration: SUB_UID_MIN (%lu), SUB_UID_MAX (%lu)\n"),
Prog, min, max);
return -1;
}
start = sub_uid_find_free_range(min, max, count);
if (start == (uid_t)-1) {
fprintf (stderr,
_("%s: Can't get unique secondary UID range\n"),
Prog);
SYSLOG ((LOG_WARN, "no more available secondary UIDs on the system"));
return -1;
}
*range_start = start;
*range_count = count;
return 0;
}