permission.c (292dd876ee765c478b27c93cc51e93a558ed58bf) permission.c (b6dff3ec5e116e3af6f537d4caedcad6b9e5082a)
1/* permission.c: key permission determination
2 *
3 * Copyright (C) 2005 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version

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17/*
18 * check to see whether permission is granted to use a key in the desired way,
19 * but permit the security modules to override
20 */
21int key_task_permission(const key_ref_t key_ref,
22 struct task_struct *context,
23 key_perm_t perm)
24{
1/* permission.c: key permission determination
2 *
3 * Copyright (C) 2005 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version

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17/*
18 * check to see whether permission is granted to use a key in the desired way,
19 * but permit the security modules to override
20 */
21int key_task_permission(const key_ref_t key_ref,
22 struct task_struct *context,
23 key_perm_t perm)
24{
25 struct cred *cred = context->cred;
25 struct key *key;
26 key_perm_t kperm;
27 int ret;
28
29 key = key_ref_to_ptr(key_ref);
30
31 /* use the second 8-bits of permissions for keys the caller owns */
26 struct key *key;
27 key_perm_t kperm;
28 int ret;
29
30 key = key_ref_to_ptr(key_ref);
31
32 /* use the second 8-bits of permissions for keys the caller owns */
32 if (key->uid == context->fsuid) {
33 if (key->uid == cred->fsuid) {
33 kperm = key->perm >> 16;
34 goto use_these_perms;
35 }
36
37 /* use the third 8-bits of permissions for keys the caller has a group
38 * membership in common with */
39 if (key->gid != -1 && key->perm & KEY_GRP_ALL) {
34 kperm = key->perm >> 16;
35 goto use_these_perms;
36 }
37
38 /* use the third 8-bits of permissions for keys the caller has a group
39 * membership in common with */
40 if (key->gid != -1 && key->perm & KEY_GRP_ALL) {
40 if (key->gid == context->fsgid) {
41 if (key->gid == cred->fsgid) {
41 kperm = key->perm >> 8;
42 goto use_these_perms;
43 }
44
42 kperm = key->perm >> 8;
43 goto use_these_perms;
44 }
45
45 task_lock(context);
46 ret = groups_search(context->group_info, key->gid);
47 task_unlock(context);
46 spin_lock(&cred->lock);
47 ret = groups_search(cred->group_info, key->gid);
48 spin_unlock(&cred->lock);
48
49 if (ret) {
50 kperm = key->perm >> 8;
51 goto use_these_perms;
52 }
53 }
54
55 /* otherwise use the least-significant 8-bits */

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50 if (ret) {
51 kperm = key->perm >> 8;
52 goto use_these_perms;
53 }
54 }
55
56 /* otherwise use the least-significant 8-bits */

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