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
25 * Copyright (c) 2015, 2016, Intel Corporation.
26 * Author: Sebastien Buisson sebastien.buisson@bull.net
30 * lustre/llite/xattr_security.c
31 * Handler for storing security labels as extended attributes.
34 #include <linux/types.h>
35 #include <linux/security.h>
36 #ifdef HAVE_LINUX_SELINUX_IS_ENABLED
37 #include <linux/selinux.h>
39 #include <linux/xattr.h>
40 #include "llite_internal.h"
42 #ifndef XATTR_SELINUX_SUFFIX
43 # define XATTR_SELINUX_SUFFIX "selinux"
46 #ifndef XATTR_NAME_SELINUX
47 # define XATTR_NAME_SELINUX XATTR_SECURITY_PREFIX XATTR_SELINUX_SUFFIX
51 * Check for LL_SBI_FILE_SECCTX before calling.
53 int ll_dentry_init_security(struct dentry *dentry, int mode, struct qstr *name,
54 const char **secctx_name, void **secctx,
57 #ifdef HAVE_SECURITY_DENTRY_INIT_SECURITY
61 * security_dentry_init_security() is strange. Like
62 * security_inode_init_security() it may return a context (provided a
63 * Linux security module is enabled) but unlike
64 * security_inode_init_security() it does not return to us the name of
65 * the extended attribute to store the context under (for example
66 * "security.selinux"). So we only call it when we think we know what
67 * the name of the extended attribute will be. This is OK-ish since
68 * SELinux is the only module that implements
69 * security_dentry_init_security(). Note that the NFS client code just
70 * calls it and assumes that if anything is returned then it must come
74 if (!selinux_is_enabled())
77 rc = security_dentry_init_security(dentry, mode, name, secctx,
79 if (rc == -EOPNOTSUPP)
84 *secctx_name = XATTR_NAME_SELINUX;
85 #endif /* HAVE_SECURITY_DENTRY_INIT_SECURITY */
90 #ifdef HAVE_SECURITY_IINITSEC_CALLBACK
92 * A helper function for ll_security_inode_init_security()
93 * that takes care of setting xattrs
95 * Get security context of @inode from @xattr_array,
96 * and put it in 'security.xxx' xattr of dentry
100 * \retval -ENOMEM if no memory could be allocated for xattr name
101 * \retval < 0 failure to set xattr
104 ll_initxattrs(struct inode *inode, const struct xattr *xattr_array,
107 struct dentry *dentry = fs_info;
108 const struct xattr *xattr;
111 for (xattr = xattr_array; xattr->name; xattr++) {
114 full_name = kasprintf(GFP_KERNEL, "%s%s",
115 XATTR_SECURITY_PREFIX, xattr->name);
121 err = __vfs_setxattr(dentry, inode, full_name, xattr->value,
122 xattr->value_len, XATTR_CREATE);
131 * Initializes security context
133 * Get security context of @inode in @dir,
134 * and put it in 'security.xxx' xattr of @dentry.
136 * \retval 0 success, or SELinux is disabled
137 * \retval -ENOMEM if no memory could be allocated for xattr name
138 * \retval < 0 failure to get security context or set xattr
141 ll_inode_init_security(struct dentry *dentry, struct inode *inode,
146 if (!selinux_is_enabled())
149 rc = ll_security_inode_init_security(inode, dir, NULL, NULL, 0,
150 &ll_initxattrs, dentry);
151 if (rc == -EOPNOTSUPP)
156 #else /* !HAVE_SECURITY_IINITSEC_CALLBACK */
158 * Initializes security context
160 * Get security context of @inode in @dir,
161 * and put it in 'security.xxx' xattr of @dentry.
163 * \retval 0 success, or SELinux is disabled
164 * \retval -ENOMEM if no memory could be allocated for xattr name
165 * \retval < 0 failure to get security context or set xattr
168 ll_inode_init_security(struct dentry *dentry, struct inode *inode,
177 if (!selinux_is_enabled())
180 err = ll_security_inode_init_security(inode, dir, &name, &value, &len,
183 if (err == -EOPNOTSUPP)
188 full_name = kasprintf(GFP_KERNEL, "%s%s", XATTR_SECURITY_PREFIX, name);
190 GOTO(out_free, err = -ENOMEM);
192 err = __vfs_setxattr(dentry, inode, full_name, value, len,
201 #endif /* HAVE_SECURITY_IINITSEC_CALLBACK */
204 * Get security context xattr name used by policy.
206 * \retval >= 0 length of xattr name
207 * \retval < 0 failure to get security context xattr name
210 ll_listsecurity(struct inode *inode, char *secctx_name, size_t secctx_name_size)
214 if (!selinux_is_enabled())
217 #ifdef HAVE_SECURITY_INODE_LISTSECURITY
218 rc = security_inode_listsecurity(inode, secctx_name, secctx_name_size);
219 if (rc >= secctx_name_size)
222 secctx_name[rc] = '\0';
224 #else /* !HAVE_SECURITY_INODE_LISTSECURITY */
225 rc = sizeof(XATTR_NAME_SELINUX);
226 if (secctx_name && rc < secctx_name_size) {
227 memcpy(secctx_name, XATTR_NAME_SELINUX, rc);
228 secctx_name[rc] = '\0';
233 #endif /* HAVE_SECURITY_INODE_LISTSECURITY */