4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see http://www.gnu.org/licenses
23 * Copyright (c) 2014 Bull SAS
24 * Author: Sebastien Buisson sebastien.buisson@bull.net
28 * lustre/llite/xattr_security.c
29 * Handler for storing security labels as extended attributes.
33 #include <linux/security.h>
34 #include <linux/selinux.h>
35 #include <linux/xattr.h>
36 #include "llite_internal.h"
38 #ifdef HAVE_SECURITY_IINITSEC_CALLBACK
40 * A helper function for ll_security_inode_init_security()
41 * that takes care of setting xattrs
43 * Get security context of @inode from @xattr_array,
44 * and put it in 'security.xxx' xattr of dentry
48 * \retval -ENOMEM if no memory could be allocated for xattr name
49 * \retval < 0 failure to set xattr
52 ll_initxattrs(struct inode *inode, const struct xattr *xattr_array,
55 const struct xattr *xattr;
56 struct dentry *dentry = fs_info;
61 for (xattr = xattr_array; xattr->name != NULL; xattr++) {
62 name_len = strlen(XATTR_SECURITY_PREFIX) + strlen(xattr->name)
64 OBD_ALLOC(full_name, name_len);
65 if (full_name == NULL)
67 strlcpy(full_name, XATTR_SECURITY_PREFIX, name_len);
68 strlcat(full_name, xattr->name, name_len);
70 err = ll_setxattr(dentry, full_name, xattr->value,
73 OBD_FREE(full_name, name_len);
82 * Initializes security context
84 * Get security context of @inode in @dir,
85 * and put it in 'security.xxx' xattr of @dentry.
87 * \retval 0 success, or SELinux is disabled
88 * \retval -ENOMEM if no memory could be allocated for xattr name
89 * \retval < 0 failure to get security context or set xattr
92 ll_init_security(struct dentry *dentry, struct inode *inode, struct inode *dir)
94 if (!selinux_is_enabled())
97 return ll_security_inode_init_security(inode, dir, NULL, NULL, 0,
98 &ll_initxattrs, dentry);
100 #else /* !HAVE_SECURITY_IINITSEC_CALLBACK */
102 * Initializes security context
104 * Get security context of @inode in @dir,
105 * and put it in 'security.xxx' xattr of @dentry.
107 * \retval 0 success, or SELinux is disabled
108 * \retval -ENOMEM if no memory could be allocated for xattr name
109 * \retval < 0 failure to get security context or set xattr
112 ll_init_security(struct dentry *dentry, struct inode *inode, struct inode *dir)
115 size_t len, name_len;
117 char *name, *full_name;
119 if (!selinux_is_enabled())
122 err = ll_security_inode_init_security(inode, dir, &name, &value, &len,
125 if (err == -EOPNOTSUPP)
130 name_len = strlen(XATTR_SECURITY_PREFIX) + strlen(name) + 1;
131 OBD_ALLOC(full_name, name_len);
132 if (full_name == NULL)
133 GOTO(out_free, err = -ENOMEM);
134 strlcpy(full_name, XATTR_SECURITY_PREFIX, name_len);
135 strlcat(full_name, name, name_len);
137 err = ll_setxattr(dentry, full_name, value, len, 0);
138 OBD_FREE(full_name, name_len);
146 #endif /* HAVE_SECURITY_IINITSEC_CALLBACK */