1 /* Copyright (C) 1989,1991,1993,1996-2006,2008,2010,2011
2 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
28 #include <sys/param.h>
29 #include <sys/types.h>
32 #include "../nscd/nscd-client.h"
33 #include "../nscd/nscd_proto.h"
36 /* Type of the lookup function. */
37 typedef enum nss_status (*initgroups_dyn_function
) (const char *, gid_t
,
38 long int *, long int *,
39 gid_t
**, long int, int *);
41 /* The lookup function for the first entry of this service. */
42 extern int __nss_group_lookup (service_user
**nip
, const char *name
,
44 extern void *__nss_lookup_function (service_user
*ni
, const char *fct_name
);
46 extern service_user
*__nss_group_database attribute_hidden
;
47 service_user
*__nss_initgroups_database
;
48 static bool use_initgroups_entry
;
51 #include "compat-initgroups.c"
55 internal_getgrouplist (const char *user
, gid_t group
, long int *size
,
56 gid_t
**groupsp
, long int limit
)
59 if (__nss_not_use_nscd_group
> 0
60 && ++__nss_not_use_nscd_group
> NSS_NSCD_RETRY
)
61 __nss_not_use_nscd_group
= 0;
62 if (!__nss_not_use_nscd_group
63 && !__nss_database_custom
[NSS_DBSIDX_group
])
65 int n
= __nscd_getgrouplist (user
, group
, size
, groupsp
, limit
);
69 /* nscd is not usable. */
70 __nss_not_use_nscd_group
= 1;
74 enum nss_status status
= NSS_STATUS_UNAVAIL
;
77 /* Never store more than the starting *SIZE number of elements. */
79 (*groupsp
)[0] = group
;
80 /* Start is one, because we have the first group as parameter. */
83 if (__nss_initgroups_database
== NULL
)
85 if (__nss_database_lookup ("initgroups", NULL
, "",
86 &__nss_initgroups_database
) < 0)
88 if (__nss_group_database
== NULL
)
89 no_more
= __nss_database_lookup ("group", NULL
, "compat files",
90 &__nss_group_database
);
92 __nss_initgroups_database
= __nss_group_database
;
95 use_initgroups_entry
= true;
98 /* __nss_initgroups_database might have been set through
99 __nss_configure_lookup in which case use_initgroups_entry was
101 use_initgroups_entry
= __nss_initgroups_database
!= __nss_group_database
;
103 service_user
*nip
= __nss_initgroups_database
;
106 long int prev_start
= start
;
108 initgroups_dyn_function fct
= __nss_lookup_function (nip
,
111 status
= compat_call (nip
, user
, group
, &start
, size
, groupsp
,
114 status
= DL_CALL_FCT (fct
, (user
, group
, &start
, size
, groupsp
,
117 /* Remove duplicates. */
118 long int cnt
= prev_start
;
122 for (inner
= 0; inner
< prev_start
; ++inner
)
123 if ((*groupsp
)[inner
] == (*groupsp
)[cnt
])
126 if (inner
< prev_start
)
127 (*groupsp
)[cnt
] = (*groupsp
)[--start
];
132 /* This is really only for debugging. */
133 if (NSS_STATUS_TRYAGAIN
> status
|| status
> NSS_STATUS_RETURN
)
134 __libc_fatal ("illegal status in internal_getgrouplist");
136 /* For compatibility reason we will continue to look for more
137 entries using the next service even though data has already
138 been found if the nsswitch.conf file contained only a 'groups'
139 line and no 'initgroups' line. If the latter is available
140 we always respect the status. This means that the default
141 for successful lookups is to return. */
142 if ((use_initgroups_entry
|| status
!= NSS_STATUS_SUCCESS
)
143 && nss_next_action (nip
, status
) == NSS_ACTION_RETURN
)
146 if (nip
->next
== NULL
)
155 /* Store at most *NGROUPS members of the group set for USER into
156 *GROUPS. Also include GROUP. The actual number of groups found is
157 returned in *NGROUPS. Return -1 if the if *NGROUPS is too small. */
159 getgrouplist (const char *user
, gid_t group
, gid_t
*groups
, int *ngroups
)
161 long int size
= MAX (1, *ngroups
);
163 gid_t
*newgroups
= (gid_t
*) malloc (size
* sizeof (gid_t
));
164 if (__builtin_expect (newgroups
== NULL
, 0))
165 /* No more memory. */
166 // XXX This is wrong. The user provided memory, we have to use
167 // XXX it. The internal functions must be called with the user
168 // XXX provided buffer and not try to increase the size if it is
169 // XXX too small. For initgroups a flag could say: increase size.
172 int total
= internal_getgrouplist (user
, group
, &size
, &newgroups
, -1);
174 memcpy (groups
, newgroups
, MIN (*ngroups
, total
) * sizeof (gid_t
));
178 int retval
= total
> *ngroups
? -1 : total
;
184 static_link_warning (getgrouplist
)
186 /* Initialize the group set for the current user
187 by reading the group database and using all groups
188 of which USER is a member. Also include GROUP. */
190 initgroups (const char *user
, gid_t group
)
192 #if defined NGROUPS_MAX && NGROUPS_MAX == 0
194 /* No extra groups allowed. */
204 /* We always use sysconf even if NGROUPS_MAX is defined. That way, the
205 limit can be raised in the kernel configuration without having to
207 long int limit
= __sysconf (_SC_NGROUPS_MAX
);
210 /* We limit the size of the intially allocated array. */
211 size
= MIN (limit
, 64);
213 /* No fixed limit on groups. Pick a starting buffer size. */
216 groups
= (gid_t
*) malloc (size
* sizeof (gid_t
));
217 if (__builtin_expect (groups
== NULL
, 0))
218 /* No more memory. */
221 ngroups
= internal_getgrouplist (user
, group
, &size
, &groups
, limit
);
223 /* Try to set the maximum number of groups the kernel can handle. */
225 result
= setgroups (ngroups
, groups
);
226 while (result
== -1 && errno
== EINVAL
&& --ngroups
> 0);
234 static_link_warning (initgroups
)