/*
* Copyright (c) 2014 Bull SAS
+ *
+ * Copyright (c) 2015, 2016, Intel Corporation.
* Author: Sebastien Buisson sebastien.buisson@bull.net
*/
* Handler for storing security labels as extended attributes.
*/
-
+#include <linux/types.h>
#include <linux/security.h>
+#ifdef HAVE_LINUX_SELINUX_IS_ENABLED
#include <linux/selinux.h>
+#endif
#include <linux/xattr.h>
#include "llite_internal.h"
-#ifdef HAVE_SECURITY_IINITSEC_CALLBACK
+#ifndef XATTR_SELINUX_SUFFIX
+# define XATTR_SELINUX_SUFFIX "selinux"
+#endif
+
+#ifndef XATTR_NAME_SELINUX
+# define XATTR_NAME_SELINUX XATTR_SECURITY_PREFIX XATTR_SELINUX_SUFFIX
+#endif
+
+/*
+ * Check for LL_SBI_FILE_SECCTX before calling.
+ */
+int ll_dentry_init_security(struct dentry *dentry, int mode, struct qstr *name,
+ const char **secctx_name, void **secctx,
+ __u32 *secctx_size)
+{
+ int rc;
+
+ /*
+ * security_dentry_init_security() is strange. Like
+ * security_inode_init_security() it may return a context (provided a
+ * Linux security module is enabled) but unlike
+ * security_inode_init_security() it does not return to us the name of
+ * the extended attribute to store the context under (for example
+ * "security.selinux"). So we only call it when we think we know what
+ * the name of the extended attribute will be. This is OK-ish since
+ * SELinux is the only module that implements
+ * security_dentry_init_security(). Note that the NFS client code just
+ * calls it and assumes that if anything is returned then it must come
+ * from SELinux.
+ */
+
+ if (!selinux_is_enabled())
+ return 0;
+
+ rc = security_dentry_init_security(dentry, mode, name, secctx,
+ secctx_size);
+ if (rc == -EOPNOTSUPP)
+ return 0;
+ if (rc < 0)
+ return rc;
+
+ *secctx_name = XATTR_NAME_SELINUX;
+
+ return 0;
+}
+
/**
- * A helper function for ll_security_inode_init_security()
+ * A helper function for security_inode_init_security()
* that takes care of setting xattrs
*
* Get security context of @inode from @xattr_array,
ll_initxattrs(struct inode *inode, const struct xattr *xattr_array,
void *fs_info)
{
- const struct xattr *xattr;
struct dentry *dentry = fs_info;
- size_t name_len;
- char *full_name;
+ const struct xattr *xattr;
int err = 0;
- for (xattr = xattr_array; xattr->name != NULL; xattr++) {
- name_len = strlen(XATTR_SECURITY_PREFIX) + strlen(xattr->name)
- + 1;
- OBD_ALLOC(full_name, name_len);
- if (full_name == NULL)
- return -ENOMEM;
- strlcpy(full_name, XATTR_SECURITY_PREFIX, name_len);
- strlcat(full_name, xattr->name, name_len);
-
- err = ll_setxattr(dentry, full_name, xattr->value,
- xattr->value_len, 0);
+ for (xattr = xattr_array; xattr->name; xattr++) {
+ char *full_name;
- OBD_FREE(full_name, name_len);
+ full_name = kasprintf(GFP_KERNEL, "%s%s",
+ XATTR_SECURITY_PREFIX, xattr->name);
+ if (!full_name) {
+ err = -ENOMEM;
+ break;
+ }
+ err = ll_vfs_setxattr(dentry, inode, full_name, xattr->value,
+ xattr->value_len, XATTR_CREATE);
+ kfree(full_name);
if (err < 0)
break;
}
* \retval < 0 failure to get security context or set xattr
*/
int
-ll_init_security(struct dentry *dentry, struct inode *inode, struct inode *dir)
+ll_inode_init_security(struct dentry *dentry, struct inode *inode,
+ struct inode *dir)
{
+ int rc;
+
if (!selinux_is_enabled())
return 0;
- return ll_security_inode_init_security(inode, dir, NULL, NULL, 0,
- &ll_initxattrs, dentry);
+ rc = security_inode_init_security(inode, dir, NULL,
+ &ll_initxattrs, dentry);
+ if (rc == -EOPNOTSUPP)
+ return 0;
+
+ return rc;
}
-#else /* !HAVE_SECURITY_IINITSEC_CALLBACK */
+
/**
- * Initializes security context
- *
- * Get security context of @inode in @dir,
- * and put it in 'security.xxx' xattr of @dentry.
+ * Get security context xattr name used by policy.
*
- * \retval 0 success, or SELinux is disabled
- * \retval -ENOMEM if no memory could be allocated for xattr name
- * \retval < 0 failure to get security context or set xattr
+ * \retval >= 0 length of xattr name
+ * \retval < 0 failure to get security context xattr name
*/
int
-ll_init_security(struct dentry *dentry, struct inode *inode, struct inode *dir)
+ll_listsecurity(struct inode *inode, char *secctx_name, size_t secctx_name_size)
{
- int err;
- size_t len, name_len;
- void *value;
- char *name, *full_name;
+ int rc;
if (!selinux_is_enabled())
return 0;
- err = ll_security_inode_init_security(inode, dir, &name, &value, &len,
- NULL, dentry);
- if (err != 0) {
- if (err == -EOPNOTSUPP)
- return 0;
- return err;
- }
-
- name_len = strlen(XATTR_SECURITY_PREFIX) + strlen(name) + 1;
- OBD_ALLOC(full_name, name_len);
- if (full_name == NULL)
- GOTO(out_free, err = -ENOMEM);
- strlcpy(full_name, XATTR_SECURITY_PREFIX, name_len);
- strlcat(full_name, name, name_len);
-
- err = ll_setxattr(dentry, full_name, value, len, 0);
- OBD_FREE(full_name, name_len);
-
-out_free:
- kfree(name);
- kfree(value);
-
- return err;
+ rc = security_inode_listsecurity(inode, secctx_name, secctx_name_size);
+ if (rc >= secctx_name_size)
+ rc = -ERANGE;
+ else if (rc >= 0)
+ secctx_name[rc] = '\0';
+ return rc;
}
-#endif /* HAVE_SECURITY_IINITSEC_CALLBACK */
git://git.whamcloud.com / fs / lustre-release.git / blobdiff