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@@ -0,0 +1,2518 @@
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+/*
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+ * Simplified MAC Kernel (smack) security module
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+ *
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+ * This file contains the smack hook function implementations.
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+ *
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+ * Author:
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+ * Casey Schaufler <casey@schaufler-ca.com>
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+ *
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+ * Copyright (C) 2007 Casey Schaufler <casey@schaufler-ca.com>
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License version 2,
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+ * as published by the Free Software Foundation.
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+ */
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+
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+#include <linux/xattr.h>
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+#include <linux/pagemap.h>
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+#include <linux/mount.h>
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+#include <linux/stat.h>
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+#include <linux/ext2_fs.h>
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+#include <linux/kd.h>
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+#include <asm/ioctls.h>
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+#include <linux/tcp.h>
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+#include <linux/udp.h>
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+#include <linux/mutex.h>
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+#include <linux/pipe_fs_i.h>
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+#include <net/netlabel.h>
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+#include <net/cipso_ipv4.h>
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+
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+#include "smack.h"
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+
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+/*
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+ * I hope these are the hokeyist lines of code in the module. Casey.
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+ */
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+#define DEVPTS_SUPER_MAGIC 0x1cd1
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+#define SOCKFS_MAGIC 0x534F434B
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+#define TMPFS_MAGIC 0x01021994
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+
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+/**
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+ * smk_fetch - Fetch the smack label from a file.
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+ * @ip: a pointer to the inode
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+ * @dp: a pointer to the dentry
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+ *
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+ * Returns a pointer to the master list entry for the Smack label
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+ * or NULL if there was no label to fetch.
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+ */
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+static char *smk_fetch(struct inode *ip, struct dentry *dp)
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+{
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+ int rc;
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+ char in[SMK_LABELLEN];
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+
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+ if (ip->i_op->getxattr == NULL)
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+ return NULL;
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+
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+ rc = ip->i_op->getxattr(dp, XATTR_NAME_SMACK, in, SMK_LABELLEN);
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+ if (rc < 0)
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+ return NULL;
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+
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+ return smk_import(in, rc);
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+}
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+
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+/**
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+ * new_inode_smack - allocate an inode security blob
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+ * @smack: a pointer to the Smack label to use in the blob
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+ *
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+ * Returns the new blob or NULL if there's no memory available
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+ */
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+struct inode_smack *new_inode_smack(char *smack)
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+{
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+ struct inode_smack *isp;
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+
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+ isp = kzalloc(sizeof(struct inode_smack), GFP_KERNEL);
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+ if (isp == NULL)
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+ return NULL;
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+
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+ isp->smk_inode = smack;
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+ isp->smk_flags = 0;
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+ mutex_init(&isp->smk_lock);
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+
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+ return isp;
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+}
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+
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+/*
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+ * LSM hooks.
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+ * We he, that is fun!
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+ */
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+
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+/**
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+ * smack_ptrace - Smack approval on ptrace
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+ * @ptp: parent task pointer
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+ * @ctp: child task pointer
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+ *
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+ * Returns 0 if access is OK, an error code otherwise
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+ *
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+ * Do the capability checks, and require read and write.
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+ */
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+static int smack_ptrace(struct task_struct *ptp, struct task_struct *ctp)
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+{
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+ int rc;
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+
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+ rc = cap_ptrace(ptp, ctp);
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+ if (rc != 0)
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+ return rc;
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+
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+ rc = smk_access(ptp->security, ctp->security, MAY_READWRITE);
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+ if (rc != 0 && __capable(ptp, CAP_MAC_OVERRIDE))
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+ return 0;
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+
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+ return rc;
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+}
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+
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+/**
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+ * smack_syslog - Smack approval on syslog
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+ * @type: message type
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+ *
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+ * Require that the task has the floor label
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+ *
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+ * Returns 0 on success, error code otherwise.
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+ */
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+static int smack_syslog(int type)
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+{
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+ int rc;
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+ char *sp = current->security;
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+
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+ rc = cap_syslog(type);
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+ if (rc != 0)
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+ return rc;
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+
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+ if (capable(CAP_MAC_OVERRIDE))
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+ return 0;
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+
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+ if (sp != smack_known_floor.smk_known)
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+ rc = -EACCES;
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+
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+ return rc;
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+}
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+
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+
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+/*
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+ * Superblock Hooks.
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+ */
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+
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+/**
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+ * smack_sb_alloc_security - allocate a superblock blob
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+ * @sb: the superblock getting the blob
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+ *
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+ * Returns 0 on success or -ENOMEM on error.
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+ */
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+static int smack_sb_alloc_security(struct super_block *sb)
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+{
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+ struct superblock_smack *sbsp;
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+
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+ sbsp = kzalloc(sizeof(struct superblock_smack), GFP_KERNEL);
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+
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+ if (sbsp == NULL)
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+ return -ENOMEM;
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+
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+ sbsp->smk_root = smack_known_floor.smk_known;
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+ sbsp->smk_default = smack_known_floor.smk_known;
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+ sbsp->smk_floor = smack_known_floor.smk_known;
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+ sbsp->smk_hat = smack_known_hat.smk_known;
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+ sbsp->smk_initialized = 0;
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+ spin_lock_init(&sbsp->smk_sblock);
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+
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+ sb->s_security = sbsp;
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+
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+ return 0;
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+}
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+
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+/**
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+ * smack_sb_free_security - free a superblock blob
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+ * @sb: the superblock getting the blob
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+ *
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+ */
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+static void smack_sb_free_security(struct super_block *sb)
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+{
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+ kfree(sb->s_security);
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+ sb->s_security = NULL;
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+}
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+
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+/**
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+ * smack_sb_copy_data - copy mount options data for processing
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+ * @type: file system type
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+ * @orig: where to start
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+ * @smackopts
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+ *
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+ * Returns 0 on success or -ENOMEM on error.
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+ *
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+ * Copy the Smack specific mount options out of the mount
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+ * options list.
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+ */
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+static int smack_sb_copy_data(struct file_system_type *type, void *orig,
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+ void *smackopts)
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+{
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+ char *cp, *commap, *otheropts, *dp;
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+
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+ /* Binary mount data: just copy */
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+ if (type->fs_flags & FS_BINARY_MOUNTDATA) {
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+ copy_page(smackopts, orig);
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+ return 0;
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+ }
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+
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+ otheropts = (char *)get_zeroed_page(GFP_KERNEL);
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+ if (otheropts == NULL)
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+ return -ENOMEM;
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+
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+ for (cp = orig, commap = orig; commap != NULL; cp = commap + 1) {
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+ if (strstr(cp, SMK_FSDEFAULT) == cp)
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+ dp = smackopts;
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+ else if (strstr(cp, SMK_FSFLOOR) == cp)
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+ dp = smackopts;
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+ else if (strstr(cp, SMK_FSHAT) == cp)
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+ dp = smackopts;
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+ else if (strstr(cp, SMK_FSROOT) == cp)
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+ dp = smackopts;
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+ else
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+ dp = otheropts;
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+
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+ commap = strchr(cp, ',');
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+ if (commap != NULL)
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+ *commap = '\0';
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+
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+ if (*dp != '\0')
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+ strcat(dp, ",");
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+ strcat(dp, cp);
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+ }
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+
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+ strcpy(orig, otheropts);
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+ free_page((unsigned long)otheropts);
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+
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+ return 0;
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+}
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+
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+/**
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+ * smack_sb_kern_mount - Smack specific mount processing
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+ * @sb: the file system superblock
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+ * @data: the smack mount options
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+ *
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+ * Returns 0 on success, an error code on failure
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+ */
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+static int smack_sb_kern_mount(struct super_block *sb, void *data)
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+{
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+ struct dentry *root = sb->s_root;
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+ struct inode *inode = root->d_inode;
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+ struct superblock_smack *sp = sb->s_security;
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+ struct inode_smack *isp;
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+ char *op;
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+ char *commap;
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+ char *nsp;
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+
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+ spin_lock(&sp->smk_sblock);
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+ if (sp->smk_initialized != 0) {
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+ spin_unlock(&sp->smk_sblock);
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+ return 0;
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+ }
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+ sp->smk_initialized = 1;
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+ spin_unlock(&sp->smk_sblock);
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+
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+ for (op = data; op != NULL; op = commap) {
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+ commap = strchr(op, ',');
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+ if (commap != NULL)
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+ *commap++ = '\0';
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+
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+ if (strncmp(op, SMK_FSHAT, strlen(SMK_FSHAT)) == 0) {
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+ op += strlen(SMK_FSHAT);
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+ nsp = smk_import(op, 0);
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+ if (nsp != NULL)
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+ sp->smk_hat = nsp;
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+ } else if (strncmp(op, SMK_FSFLOOR, strlen(SMK_FSFLOOR)) == 0) {
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+ op += strlen(SMK_FSFLOOR);
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+ nsp = smk_import(op, 0);
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+ if (nsp != NULL)
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+ sp->smk_floor = nsp;
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+ } else if (strncmp(op, SMK_FSDEFAULT,
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+ strlen(SMK_FSDEFAULT)) == 0) {
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+ op += strlen(SMK_FSDEFAULT);
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+ nsp = smk_import(op, 0);
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+ if (nsp != NULL)
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+ sp->smk_default = nsp;
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+ } else if (strncmp(op, SMK_FSROOT, strlen(SMK_FSROOT)) == 0) {
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+ op += strlen(SMK_FSROOT);
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+ nsp = smk_import(op, 0);
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+ if (nsp != NULL)
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+ sp->smk_root = nsp;
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+ }
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+ }
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+
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+ /*
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+ * Initialize the root inode.
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+ */
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+ isp = inode->i_security;
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+ if (isp == NULL)
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+ inode->i_security = new_inode_smack(sp->smk_root);
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+ else
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+ isp->smk_inode = sp->smk_root;
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+
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+ return 0;
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+}
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+
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+/**
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+ * smack_sb_statfs - Smack check on statfs
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+ * @dentry: identifies the file system in question
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+ *
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+ * Returns 0 if current can read the floor of the filesystem,
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+ * and error code otherwise
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+ */
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+static int smack_sb_statfs(struct dentry *dentry)
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+{
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+ struct superblock_smack *sbp = dentry->d_sb->s_security;
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+
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+ return smk_curacc(sbp->smk_floor, MAY_READ);
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+}
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+
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+/**
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+ * smack_sb_mount - Smack check for mounting
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+ * @dev_name: unused
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+ * @nd: mount point
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+ * @type: unused
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+ * @flags: unused
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+ * @data: unused
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+ *
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+ * Returns 0 if current can write the floor of the filesystem
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+ * being mounted on, an error code otherwise.
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+ */
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+static int smack_sb_mount(char *dev_name, struct nameidata *nd,
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+ char *type, unsigned long flags, void *data)
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+{
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+ struct superblock_smack *sbp = nd->mnt->mnt_sb->s_security;
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+
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+ return smk_curacc(sbp->smk_floor, MAY_WRITE);
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+}
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+
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+/**
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+ * smack_sb_umount - Smack check for unmounting
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+ * @mnt: file system to unmount
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+ * @flags: unused
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+ *
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+ * Returns 0 if current can write the floor of the filesystem
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+ * being unmounted, an error code otherwise.
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+ */
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+static int smack_sb_umount(struct vfsmount *mnt, int flags)
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+{
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+ struct superblock_smack *sbp;
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+
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+ sbp = mnt->mnt_sb->s_security;
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+
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+ return smk_curacc(sbp->smk_floor, MAY_WRITE);
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+}
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+
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+/*
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+ * Inode hooks
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+ */
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+
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+/**
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+ * smack_inode_alloc_security - allocate an inode blob
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+ * @inode - the inode in need of a blob
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+ *
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+ * Returns 0 if it gets a blob, -ENOMEM otherwise
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+ */
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+static int smack_inode_alloc_security(struct inode *inode)
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+{
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+ inode->i_security = new_inode_smack(current->security);
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+ if (inode->i_security == NULL)
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+ return -ENOMEM;
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+ return 0;
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+}
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+
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+/**
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+ * smack_inode_free_security - free an inode blob
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+ * @inode - the inode with a blob
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+ *
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+ * Clears the blob pointer in inode
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+ */
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+static void smack_inode_free_security(struct inode *inode)
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+{
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+ kfree(inode->i_security);
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+ inode->i_security = NULL;
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+}
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+
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+/**
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+ * smack_inode_init_security - copy out the smack from an inode
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+ * @inode: the inode
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+ * @dir: unused
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+ * @name: where to put the attribute name
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+ * @value: where to put the attribute value
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+ * @len: where to put the length of the attribute
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+ *
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+ * Returns 0 if it all works out, -ENOMEM if there's no memory
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+ */
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+static int smack_inode_init_security(struct inode *inode, struct inode *dir,
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+ char **name, void **value, size_t *len)
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+{
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+ char *isp = smk_of_inode(inode);
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+
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+ if (name) {
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+ *name = kstrdup(XATTR_SMACK_SUFFIX, GFP_KERNEL);
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+ if (*name == NULL)
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+ return -ENOMEM;
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+ }
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+
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+ if (value) {
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+ *value = kstrdup(isp, GFP_KERNEL);
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+ if (*value == NULL)
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+ return -ENOMEM;
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+ }
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+
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+ if (len)
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+ *len = strlen(isp) + 1;
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+
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+ return 0;
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+}
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+
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+/**
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+ * smack_inode_link - Smack check on link
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+ * @old_dentry: the existing object
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+ * @dir: unused
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+ * @new_dentry: the new object
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+ *
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+ * Returns 0 if access is permitted, an error code otherwise
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+ */
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+static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
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+ struct dentry *new_dentry)
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+{
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+ int rc;
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+ char *isp;
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+
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+ isp = smk_of_inode(old_dentry->d_inode);
|
|
|
+ rc = smk_curacc(isp, MAY_WRITE);
|
|
|
+
|
|
|
+ if (rc == 0 && new_dentry->d_inode != NULL) {
|
|
|
+ isp = smk_of_inode(new_dentry->d_inode);
|
|
|
+ rc = smk_curacc(isp, MAY_WRITE);
|
|
|
+ }
|
|
|
+
|
|
|
+ return rc;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_inode_unlink - Smack check on inode deletion
|
|
|
+ * @dir: containing directory object
|
|
|
+ * @dentry: file to unlink
|
|
|
+ *
|
|
|
+ * Returns 0 if current can write the containing directory
|
|
|
+ * and the object, error code otherwise
|
|
|
+ */
|
|
|
+static int smack_inode_unlink(struct inode *dir, struct dentry *dentry)
|
|
|
+{
|
|
|
+ struct inode *ip = dentry->d_inode;
|
|
|
+ int rc;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * You need write access to the thing you're unlinking
|
|
|
+ */
|
|
|
+ rc = smk_curacc(smk_of_inode(ip), MAY_WRITE);
|
|
|
+ if (rc == 0)
|
|
|
+ /*
|
|
|
+ * You also need write access to the containing directory
|
|
|
+ */
|
|
|
+ rc = smk_curacc(smk_of_inode(dir), MAY_WRITE);
|
|
|
+
|
|
|
+ return rc;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_inode_rmdir - Smack check on directory deletion
|
|
|
+ * @dir: containing directory object
|
|
|
+ * @dentry: directory to unlink
|
|
|
+ *
|
|
|
+ * Returns 0 if current can write the containing directory
|
|
|
+ * and the directory, error code otherwise
|
|
|
+ */
|
|
|
+static int smack_inode_rmdir(struct inode *dir, struct dentry *dentry)
|
|
|
+{
|
|
|
+ int rc;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * You need write access to the thing you're removing
|
|
|
+ */
|
|
|
+ rc = smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE);
|
|
|
+ if (rc == 0)
|
|
|
+ /*
|
|
|
+ * You also need write access to the containing directory
|
|
|
+ */
|
|
|
+ rc = smk_curacc(smk_of_inode(dir), MAY_WRITE);
|
|
|
+
|
|
|
+ return rc;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_inode_rename - Smack check on rename
|
|
|
+ * @old_inode: the old directory
|
|
|
+ * @old_dentry: unused
|
|
|
+ * @new_inode: the new directory
|
|
|
+ * @new_dentry: unused
|
|
|
+ *
|
|
|
+ * Read and write access is required on both the old and
|
|
|
+ * new directories.
|
|
|
+ *
|
|
|
+ * Returns 0 if access is permitted, an error code otherwise
|
|
|
+ */
|
|
|
+static int smack_inode_rename(struct inode *old_inode,
|
|
|
+ struct dentry *old_dentry,
|
|
|
+ struct inode *new_inode,
|
|
|
+ struct dentry *new_dentry)
|
|
|
+{
|
|
|
+ int rc;
|
|
|
+ char *isp;
|
|
|
+
|
|
|
+ isp = smk_of_inode(old_dentry->d_inode);
|
|
|
+ rc = smk_curacc(isp, MAY_READWRITE);
|
|
|
+
|
|
|
+ if (rc == 0 && new_dentry->d_inode != NULL) {
|
|
|
+ isp = smk_of_inode(new_dentry->d_inode);
|
|
|
+ rc = smk_curacc(isp, MAY_READWRITE);
|
|
|
+ }
|
|
|
+
|
|
|
+ return rc;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_inode_permission - Smack version of permission()
|
|
|
+ * @inode: the inode in question
|
|
|
+ * @mask: the access requested
|
|
|
+ * @nd: unused
|
|
|
+ *
|
|
|
+ * This is the important Smack hook.
|
|
|
+ *
|
|
|
+ * Returns 0 if access is permitted, -EACCES otherwise
|
|
|
+ */
|
|
|
+static int smack_inode_permission(struct inode *inode, int mask,
|
|
|
+ struct nameidata *nd)
|
|
|
+{
|
|
|
+ /*
|
|
|
+ * No permission to check. Existence test. Yup, it's there.
|
|
|
+ */
|
|
|
+ if (mask == 0)
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ return smk_curacc(smk_of_inode(inode), mask);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_inode_setattr - Smack check for setting attributes
|
|
|
+ * @dentry: the object
|
|
|
+ * @iattr: for the force flag
|
|
|
+ *
|
|
|
+ * Returns 0 if access is permitted, an error code otherwise
|
|
|
+ */
|
|
|
+static int smack_inode_setattr(struct dentry *dentry, struct iattr *iattr)
|
|
|
+{
|
|
|
+ /*
|
|
|
+ * Need to allow for clearing the setuid bit.
|
|
|
+ */
|
|
|
+ if (iattr->ia_valid & ATTR_FORCE)
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_inode_getattr - Smack check for getting attributes
|
|
|
+ * @mnt: unused
|
|
|
+ * @dentry: the object
|
|
|
+ *
|
|
|
+ * Returns 0 if access is permitted, an error code otherwise
|
|
|
+ */
|
|
|
+static int smack_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
|
|
|
+{
|
|
|
+ return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_inode_setxattr - Smack check for setting xattrs
|
|
|
+ * @dentry: the object
|
|
|
+ * @name: name of the attribute
|
|
|
+ * @value: unused
|
|
|
+ * @size: unused
|
|
|
+ * @flags: unused
|
|
|
+ *
|
|
|
+ * This protects the Smack attribute explicitly.
|
|
|
+ *
|
|
|
+ * Returns 0 if access is permitted, an error code otherwise
|
|
|
+ */
|
|
|
+static int smack_inode_setxattr(struct dentry *dentry, char *name,
|
|
|
+ void *value, size_t size, int flags)
|
|
|
+{
|
|
|
+ if (!capable(CAP_MAC_ADMIN)) {
|
|
|
+ if (strcmp(name, XATTR_NAME_SMACK) == 0 ||
|
|
|
+ strcmp(name, XATTR_NAME_SMACKIPIN) == 0 ||
|
|
|
+ strcmp(name, XATTR_NAME_SMACKIPOUT) == 0)
|
|
|
+ return -EPERM;
|
|
|
+ }
|
|
|
+
|
|
|
+ return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_inode_post_setxattr - Apply the Smack update approved above
|
|
|
+ * @dentry: object
|
|
|
+ * @name: attribute name
|
|
|
+ * @value: attribute value
|
|
|
+ * @size: attribute size
|
|
|
+ * @flags: unused
|
|
|
+ *
|
|
|
+ * Set the pointer in the inode blob to the entry found
|
|
|
+ * in the master label list.
|
|
|
+ */
|
|
|
+static void smack_inode_post_setxattr(struct dentry *dentry, char *name,
|
|
|
+ void *value, size_t size, int flags)
|
|
|
+{
|
|
|
+ struct inode_smack *isp;
|
|
|
+ char *nsp;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Not SMACK
|
|
|
+ */
|
|
|
+ if (strcmp(name, XATTR_NAME_SMACK))
|
|
|
+ return;
|
|
|
+
|
|
|
+ if (size >= SMK_LABELLEN)
|
|
|
+ return;
|
|
|
+
|
|
|
+ isp = dentry->d_inode->i_security;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * No locking is done here. This is a pointer
|
|
|
+ * assignment.
|
|
|
+ */
|
|
|
+ nsp = smk_import(value, size);
|
|
|
+ if (nsp != NULL)
|
|
|
+ isp->smk_inode = nsp;
|
|
|
+ else
|
|
|
+ isp->smk_inode = smack_known_invalid.smk_known;
|
|
|
+
|
|
|
+ return;
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ * smack_inode_getxattr - Smack check on getxattr
|
|
|
+ * @dentry: the object
|
|
|
+ * @name: unused
|
|
|
+ *
|
|
|
+ * Returns 0 if access is permitted, an error code otherwise
|
|
|
+ */
|
|
|
+static int smack_inode_getxattr(struct dentry *dentry, char *name)
|
|
|
+{
|
|
|
+ return smk_curacc(smk_of_inode(dentry->d_inode), MAY_READ);
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ * smack_inode_removexattr - Smack check on removexattr
|
|
|
+ * @dentry: the object
|
|
|
+ * @name: name of the attribute
|
|
|
+ *
|
|
|
+ * Removing the Smack attribute requires CAP_MAC_ADMIN
|
|
|
+ *
|
|
|
+ * Returns 0 if access is permitted, an error code otherwise
|
|
|
+ */
|
|
|
+static int smack_inode_removexattr(struct dentry *dentry, char *name)
|
|
|
+{
|
|
|
+ if (strcmp(name, XATTR_NAME_SMACK) == 0 && !capable(CAP_MAC_ADMIN))
|
|
|
+ return -EPERM;
|
|
|
+
|
|
|
+ return smk_curacc(smk_of_inode(dentry->d_inode), MAY_WRITE);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_inode_getsecurity - get smack xattrs
|
|
|
+ * @inode: the object
|
|
|
+ * @name: attribute name
|
|
|
+ * @buffer: where to put the result
|
|
|
+ * @size: size of the buffer
|
|
|
+ * @err: unused
|
|
|
+ *
|
|
|
+ * Returns the size of the attribute or an error code
|
|
|
+ */
|
|
|
+static int smack_inode_getsecurity(const struct inode *inode,
|
|
|
+ const char *name, void **buffer,
|
|
|
+ bool alloc)
|
|
|
+{
|
|
|
+ struct socket_smack *ssp;
|
|
|
+ struct socket *sock;
|
|
|
+ struct super_block *sbp;
|
|
|
+ struct inode *ip = (struct inode *)inode;
|
|
|
+ char *isp;
|
|
|
+ int ilen;
|
|
|
+ int rc = 0;
|
|
|
+
|
|
|
+ if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
|
|
|
+ isp = smk_of_inode(inode);
|
|
|
+ ilen = strlen(isp) + 1;
|
|
|
+ *buffer = isp;
|
|
|
+ return ilen;
|
|
|
+ }
|
|
|
+
|
|
|
+ /*
|
|
|
+ * The rest of the Smack xattrs are only on sockets.
|
|
|
+ */
|
|
|
+ sbp = ip->i_sb;
|
|
|
+ if (sbp->s_magic != SOCKFS_MAGIC)
|
|
|
+ return -EOPNOTSUPP;
|
|
|
+
|
|
|
+ sock = SOCKET_I(ip);
|
|
|
+ if (sock == NULL)
|
|
|
+ return -EOPNOTSUPP;
|
|
|
+
|
|
|
+ ssp = sock->sk->sk_security;
|
|
|
+
|
|
|
+ if (strcmp(name, XATTR_SMACK_IPIN) == 0)
|
|
|
+ isp = ssp->smk_in;
|
|
|
+ else if (strcmp(name, XATTR_SMACK_IPOUT) == 0)
|
|
|
+ isp = ssp->smk_out;
|
|
|
+ else
|
|
|
+ return -EOPNOTSUPP;
|
|
|
+
|
|
|
+ ilen = strlen(isp) + 1;
|
|
|
+ if (rc == 0) {
|
|
|
+ *buffer = isp;
|
|
|
+ rc = ilen;
|
|
|
+ }
|
|
|
+
|
|
|
+ return rc;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_inode_listsecurity - list the Smack attributes
|
|
|
+ * @inode: the object
|
|
|
+ * @buffer: where they go
|
|
|
+ * @buffer_size: size of buffer
|
|
|
+ *
|
|
|
+ * Returns 0 on success, -EINVAL otherwise
|
|
|
+ */
|
|
|
+static int smack_inode_listsecurity(struct inode *inode, char *buffer,
|
|
|
+ size_t buffer_size)
|
|
|
+{
|
|
|
+ int len = strlen(XATTR_NAME_SMACK);
|
|
|
+
|
|
|
+ if (buffer != NULL && len <= buffer_size) {
|
|
|
+ memcpy(buffer, XATTR_NAME_SMACK, len);
|
|
|
+ return len;
|
|
|
+ }
|
|
|
+ return -EINVAL;
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ * File Hooks
|
|
|
+ */
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_file_permission - Smack check on file operations
|
|
|
+ * @file: unused
|
|
|
+ * @mask: unused
|
|
|
+ *
|
|
|
+ * Returns 0
|
|
|
+ *
|
|
|
+ * Should access checks be done on each read or write?
|
|
|
+ * UNICOS and SELinux say yes.
|
|
|
+ * Trusted Solaris, Trusted Irix, and just about everyone else says no.
|
|
|
+ *
|
|
|
+ * I'll say no for now. Smack does not do the frequent
|
|
|
+ * label changing that SELinux does.
|
|
|
+ */
|
|
|
+static int smack_file_permission(struct file *file, int mask)
|
|
|
+{
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_file_alloc_security - assign a file security blob
|
|
|
+ * @file: the object
|
|
|
+ *
|
|
|
+ * The security blob for a file is a pointer to the master
|
|
|
+ * label list, so no allocation is done.
|
|
|
+ *
|
|
|
+ * Returns 0
|
|
|
+ */
|
|
|
+static int smack_file_alloc_security(struct file *file)
|
|
|
+{
|
|
|
+ file->f_security = current->security;
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_file_free_security - clear a file security blob
|
|
|
+ * @file: the object
|
|
|
+ *
|
|
|
+ * The security blob for a file is a pointer to the master
|
|
|
+ * label list, so no memory is freed.
|
|
|
+ */
|
|
|
+static void smack_file_free_security(struct file *file)
|
|
|
+{
|
|
|
+ file->f_security = NULL;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_file_ioctl - Smack check on ioctls
|
|
|
+ * @file: the object
|
|
|
+ * @cmd: what to do
|
|
|
+ * @arg: unused
|
|
|
+ *
|
|
|
+ * Relies heavily on the correct use of the ioctl command conventions.
|
|
|
+ *
|
|
|
+ * Returns 0 if allowed, error code otherwise
|
|
|
+ */
|
|
|
+static int smack_file_ioctl(struct file *file, unsigned int cmd,
|
|
|
+ unsigned long arg)
|
|
|
+{
|
|
|
+ int rc = 0;
|
|
|
+
|
|
|
+ if (_IOC_DIR(cmd) & _IOC_WRITE)
|
|
|
+ rc = smk_curacc(file->f_security, MAY_WRITE);
|
|
|
+
|
|
|
+ if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ))
|
|
|
+ rc = smk_curacc(file->f_security, MAY_READ);
|
|
|
+
|
|
|
+ return rc;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_file_lock - Smack check on file locking
|
|
|
+ * @file: the object
|
|
|
+ * @cmd unused
|
|
|
+ *
|
|
|
+ * Returns 0 if current has write access, error code otherwise
|
|
|
+ */
|
|
|
+static int smack_file_lock(struct file *file, unsigned int cmd)
|
|
|
+{
|
|
|
+ return smk_curacc(file->f_security, MAY_WRITE);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_file_fcntl - Smack check on fcntl
|
|
|
+ * @file: the object
|
|
|
+ * @cmd: what action to check
|
|
|
+ * @arg: unused
|
|
|
+ *
|
|
|
+ * Returns 0 if current has access, error code otherwise
|
|
|
+ */
|
|
|
+static int smack_file_fcntl(struct file *file, unsigned int cmd,
|
|
|
+ unsigned long arg)
|
|
|
+{
|
|
|
+ int rc;
|
|
|
+
|
|
|
+ switch (cmd) {
|
|
|
+ case F_DUPFD:
|
|
|
+ case F_GETFD:
|
|
|
+ case F_GETFL:
|
|
|
+ case F_GETLK:
|
|
|
+ case F_GETOWN:
|
|
|
+ case F_GETSIG:
|
|
|
+ rc = smk_curacc(file->f_security, MAY_READ);
|
|
|
+ break;
|
|
|
+ case F_SETFD:
|
|
|
+ case F_SETFL:
|
|
|
+ case F_SETLK:
|
|
|
+ case F_SETLKW:
|
|
|
+ case F_SETOWN:
|
|
|
+ case F_SETSIG:
|
|
|
+ rc = smk_curacc(file->f_security, MAY_WRITE);
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ rc = smk_curacc(file->f_security, MAY_READWRITE);
|
|
|
+ }
|
|
|
+
|
|
|
+ return rc;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_file_set_fowner - set the file security blob value
|
|
|
+ * @file: object in question
|
|
|
+ *
|
|
|
+ * Returns 0
|
|
|
+ * Further research may be required on this one.
|
|
|
+ */
|
|
|
+static int smack_file_set_fowner(struct file *file)
|
|
|
+{
|
|
|
+ file->f_security = current->security;
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_file_send_sigiotask - Smack on sigio
|
|
|
+ * @tsk: The target task
|
|
|
+ * @fown: the object the signal come from
|
|
|
+ * @signum: unused
|
|
|
+ *
|
|
|
+ * Allow a privileged task to get signals even if it shouldn't
|
|
|
+ *
|
|
|
+ * Returns 0 if a subject with the object's smack could
|
|
|
+ * write to the task, an error code otherwise.
|
|
|
+ */
|
|
|
+static int smack_file_send_sigiotask(struct task_struct *tsk,
|
|
|
+ struct fown_struct *fown, int signum)
|
|
|
+{
|
|
|
+ struct file *file;
|
|
|
+ int rc;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * struct fown_struct is never outside the context of a struct file
|
|
|
+ */
|
|
|
+ file = container_of(fown, struct file, f_owner);
|
|
|
+ rc = smk_access(file->f_security, tsk->security, MAY_WRITE);
|
|
|
+ if (rc != 0 && __capable(tsk, CAP_MAC_OVERRIDE))
|
|
|
+ return 0;
|
|
|
+ return rc;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_file_receive - Smack file receive check
|
|
|
+ * @file: the object
|
|
|
+ *
|
|
|
+ * Returns 0 if current has access, error code otherwise
|
|
|
+ */
|
|
|
+static int smack_file_receive(struct file *file)
|
|
|
+{
|
|
|
+ int may = 0;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * This code relies on bitmasks.
|
|
|
+ */
|
|
|
+ if (file->f_mode & FMODE_READ)
|
|
|
+ may = MAY_READ;
|
|
|
+ if (file->f_mode & FMODE_WRITE)
|
|
|
+ may |= MAY_WRITE;
|
|
|
+
|
|
|
+ return smk_curacc(file->f_security, may);
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ * Task hooks
|
|
|
+ */
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_task_alloc_security - "allocate" a task blob
|
|
|
+ * @tsk: the task in need of a blob
|
|
|
+ *
|
|
|
+ * Smack isn't using copies of blobs. Everyone
|
|
|
+ * points to an immutable list. No alloc required.
|
|
|
+ * No data copy required.
|
|
|
+ *
|
|
|
+ * Always returns 0
|
|
|
+ */
|
|
|
+static int smack_task_alloc_security(struct task_struct *tsk)
|
|
|
+{
|
|
|
+ tsk->security = current->security;
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_task_free_security - "free" a task blob
|
|
|
+ * @task: the task with the blob
|
|
|
+ *
|
|
|
+ * Smack isn't using copies of blobs. Everyone
|
|
|
+ * points to an immutable list. The blobs never go away.
|
|
|
+ * There is no leak here.
|
|
|
+ */
|
|
|
+static void smack_task_free_security(struct task_struct *task)
|
|
|
+{
|
|
|
+ task->security = NULL;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_task_setpgid - Smack check on setting pgid
|
|
|
+ * @p: the task object
|
|
|
+ * @pgid: unused
|
|
|
+ *
|
|
|
+ * Return 0 if write access is permitted
|
|
|
+ */
|
|
|
+static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
|
|
|
+{
|
|
|
+ return smk_curacc(p->security, MAY_WRITE);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_task_getpgid - Smack access check for getpgid
|
|
|
+ * @p: the object task
|
|
|
+ *
|
|
|
+ * Returns 0 if current can read the object task, error code otherwise
|
|
|
+ */
|
|
|
+static int smack_task_getpgid(struct task_struct *p)
|
|
|
+{
|
|
|
+ return smk_curacc(p->security, MAY_READ);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_task_getsid - Smack access check for getsid
|
|
|
+ * @p: the object task
|
|
|
+ *
|
|
|
+ * Returns 0 if current can read the object task, error code otherwise
|
|
|
+ */
|
|
|
+static int smack_task_getsid(struct task_struct *p)
|
|
|
+{
|
|
|
+ return smk_curacc(p->security, MAY_READ);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_task_getsecid - get the secid of the task
|
|
|
+ * @p: the object task
|
|
|
+ * @secid: where to put the result
|
|
|
+ *
|
|
|
+ * Sets the secid to contain a u32 version of the smack label.
|
|
|
+ */
|
|
|
+static void smack_task_getsecid(struct task_struct *p, u32 *secid)
|
|
|
+{
|
|
|
+ *secid = smack_to_secid(p->security);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_task_setnice - Smack check on setting nice
|
|
|
+ * @p: the task object
|
|
|
+ * @nice: unused
|
|
|
+ *
|
|
|
+ * Return 0 if write access is permitted
|
|
|
+ */
|
|
|
+static int smack_task_setnice(struct task_struct *p, int nice)
|
|
|
+{
|
|
|
+ return smk_curacc(p->security, MAY_WRITE);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_task_setioprio - Smack check on setting ioprio
|
|
|
+ * @p: the task object
|
|
|
+ * @ioprio: unused
|
|
|
+ *
|
|
|
+ * Return 0 if write access is permitted
|
|
|
+ */
|
|
|
+static int smack_task_setioprio(struct task_struct *p, int ioprio)
|
|
|
+{
|
|
|
+ return smk_curacc(p->security, MAY_WRITE);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_task_getioprio - Smack check on reading ioprio
|
|
|
+ * @p: the task object
|
|
|
+ *
|
|
|
+ * Return 0 if read access is permitted
|
|
|
+ */
|
|
|
+static int smack_task_getioprio(struct task_struct *p)
|
|
|
+{
|
|
|
+ return smk_curacc(p->security, MAY_READ);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_task_setscheduler - Smack check on setting scheduler
|
|
|
+ * @p: the task object
|
|
|
+ * @policy: unused
|
|
|
+ * @lp: unused
|
|
|
+ *
|
|
|
+ * Return 0 if read access is permitted
|
|
|
+ */
|
|
|
+static int smack_task_setscheduler(struct task_struct *p, int policy,
|
|
|
+ struct sched_param *lp)
|
|
|
+{
|
|
|
+ return smk_curacc(p->security, MAY_WRITE);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_task_getscheduler - Smack check on reading scheduler
|
|
|
+ * @p: the task object
|
|
|
+ *
|
|
|
+ * Return 0 if read access is permitted
|
|
|
+ */
|
|
|
+static int smack_task_getscheduler(struct task_struct *p)
|
|
|
+{
|
|
|
+ return smk_curacc(p->security, MAY_READ);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_task_movememory - Smack check on moving memory
|
|
|
+ * @p: the task object
|
|
|
+ *
|
|
|
+ * Return 0 if write access is permitted
|
|
|
+ */
|
|
|
+static int smack_task_movememory(struct task_struct *p)
|
|
|
+{
|
|
|
+ return smk_curacc(p->security, MAY_WRITE);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_task_kill - Smack check on signal delivery
|
|
|
+ * @p: the task object
|
|
|
+ * @info: unused
|
|
|
+ * @sig: unused
|
|
|
+ * @secid: identifies the smack to use in lieu of current's
|
|
|
+ *
|
|
|
+ * Return 0 if write access is permitted
|
|
|
+ *
|
|
|
+ * The secid behavior is an artifact of an SELinux hack
|
|
|
+ * in the USB code. Someday it may go away.
|
|
|
+ */
|
|
|
+static int smack_task_kill(struct task_struct *p, struct siginfo *info,
|
|
|
+ int sig, u32 secid)
|
|
|
+{
|
|
|
+ /*
|
|
|
+ * Special cases where signals really ought to go through
|
|
|
+ * in spite of policy. Stephen Smalley suggests it may
|
|
|
+ * make sense to change the caller so that it doesn't
|
|
|
+ * bother with the LSM hook in these cases.
|
|
|
+ */
|
|
|
+ if (info != SEND_SIG_NOINFO &&
|
|
|
+ (is_si_special(info) || SI_FROMKERNEL(info)))
|
|
|
+ return 0;
|
|
|
+ /*
|
|
|
+ * Sending a signal requires that the sender
|
|
|
+ * can write the receiver.
|
|
|
+ */
|
|
|
+ if (secid == 0)
|
|
|
+ return smk_curacc(p->security, MAY_WRITE);
|
|
|
+ /*
|
|
|
+ * If the secid isn't 0 we're dealing with some USB IO
|
|
|
+ * specific behavior. This is not clean. For one thing
|
|
|
+ * we can't take privilege into account.
|
|
|
+ */
|
|
|
+ return smk_access(smack_from_secid(secid), p->security, MAY_WRITE);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_task_wait - Smack access check for waiting
|
|
|
+ * @p: task to wait for
|
|
|
+ *
|
|
|
+ * Returns 0 if current can wait for p, error code otherwise
|
|
|
+ */
|
|
|
+static int smack_task_wait(struct task_struct *p)
|
|
|
+{
|
|
|
+ int rc;
|
|
|
+
|
|
|
+ rc = smk_access(current->security, p->security, MAY_WRITE);
|
|
|
+ if (rc == 0)
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Allow the operation to succeed if either task
|
|
|
+ * has privilege to perform operations that might
|
|
|
+ * account for the smack labels having gotten to
|
|
|
+ * be different in the first place.
|
|
|
+ *
|
|
|
+ * This breaks the strict subjet/object access
|
|
|
+ * control ideal, taking the object's privilege
|
|
|
+ * state into account in the decision as well as
|
|
|
+ * the smack value.
|
|
|
+ */
|
|
|
+ if (capable(CAP_MAC_OVERRIDE) || __capable(p, CAP_MAC_OVERRIDE))
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ return rc;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_task_to_inode - copy task smack into the inode blob
|
|
|
+ * @p: task to copy from
|
|
|
+ * inode: inode to copy to
|
|
|
+ *
|
|
|
+ * Sets the smack pointer in the inode security blob
|
|
|
+ */
|
|
|
+static void smack_task_to_inode(struct task_struct *p, struct inode *inode)
|
|
|
+{
|
|
|
+ struct inode_smack *isp = inode->i_security;
|
|
|
+ isp->smk_inode = p->security;
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ * Socket hooks.
|
|
|
+ */
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_sk_alloc_security - Allocate a socket blob
|
|
|
+ * @sk: the socket
|
|
|
+ * @family: unused
|
|
|
+ * @priority: memory allocation priority
|
|
|
+ *
|
|
|
+ * Assign Smack pointers to current
|
|
|
+ *
|
|
|
+ * Returns 0 on success, -ENOMEM is there's no memory
|
|
|
+ */
|
|
|
+static int smack_sk_alloc_security(struct sock *sk, int family, gfp_t gfp_flags)
|
|
|
+{
|
|
|
+ char *csp = current->security;
|
|
|
+ struct socket_smack *ssp;
|
|
|
+
|
|
|
+ ssp = kzalloc(sizeof(struct socket_smack), gfp_flags);
|
|
|
+ if (ssp == NULL)
|
|
|
+ return -ENOMEM;
|
|
|
+
|
|
|
+ ssp->smk_in = csp;
|
|
|
+ ssp->smk_out = csp;
|
|
|
+ ssp->smk_packet[0] = '\0';
|
|
|
+
|
|
|
+ sk->sk_security = ssp;
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_sk_free_security - Free a socket blob
|
|
|
+ * @sk: the socket
|
|
|
+ *
|
|
|
+ * Clears the blob pointer
|
|
|
+ */
|
|
|
+static void smack_sk_free_security(struct sock *sk)
|
|
|
+{
|
|
|
+ kfree(sk->sk_security);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_set_catset - convert a capset to netlabel mls categories
|
|
|
+ * @catset: the Smack categories
|
|
|
+ * @sap: where to put the netlabel categories
|
|
|
+ *
|
|
|
+ * Allocates and fills attr.mls.cat
|
|
|
+ */
|
|
|
+static void smack_set_catset(char *catset, struct netlbl_lsm_secattr *sap)
|
|
|
+{
|
|
|
+ unsigned char *cp;
|
|
|
+ unsigned char m;
|
|
|
+ int cat;
|
|
|
+ int rc;
|
|
|
+ int byte;
|
|
|
+
|
|
|
+ if (catset == 0)
|
|
|
+ return;
|
|
|
+
|
|
|
+ sap->flags |= NETLBL_SECATTR_MLS_CAT;
|
|
|
+ sap->attr.mls.cat = netlbl_secattr_catmap_alloc(GFP_ATOMIC);
|
|
|
+ sap->attr.mls.cat->startbit = 0;
|
|
|
+
|
|
|
+ for (cat = 1, cp = catset, byte = 0; byte < SMK_LABELLEN; cp++, byte++)
|
|
|
+ for (m = 0x80; m != 0; m >>= 1, cat++) {
|
|
|
+ if ((m & *cp) == 0)
|
|
|
+ continue;
|
|
|
+ rc = netlbl_secattr_catmap_setbit(sap->attr.mls.cat,
|
|
|
+ cat, GFP_ATOMIC);
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_to_secattr - fill a secattr from a smack value
|
|
|
+ * @smack: the smack value
|
|
|
+ * @nlsp: where the result goes
|
|
|
+ *
|
|
|
+ * Casey says that CIPSO is good enough for now.
|
|
|
+ * It can be used to effect.
|
|
|
+ * It can also be abused to effect when necessary.
|
|
|
+ * Appologies to the TSIG group in general and GW in particular.
|
|
|
+ */
|
|
|
+static void smack_to_secattr(char *smack, struct netlbl_lsm_secattr *nlsp)
|
|
|
+{
|
|
|
+ struct smack_cipso cipso;
|
|
|
+ int rc;
|
|
|
+
|
|
|
+ switch (smack_net_nltype) {
|
|
|
+ case NETLBL_NLTYPE_CIPSOV4:
|
|
|
+ nlsp->domain = NULL;
|
|
|
+ nlsp->flags = NETLBL_SECATTR_DOMAIN;
|
|
|
+ nlsp->flags |= NETLBL_SECATTR_MLS_LVL;
|
|
|
+
|
|
|
+ rc = smack_to_cipso(smack, &cipso);
|
|
|
+ if (rc == 0) {
|
|
|
+ nlsp->attr.mls.lvl = cipso.smk_level;
|
|
|
+ smack_set_catset(cipso.smk_catset, nlsp);
|
|
|
+ } else {
|
|
|
+ nlsp->attr.mls.lvl = smack_cipso_direct;
|
|
|
+ smack_set_catset(smack, nlsp);
|
|
|
+ }
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+ break;
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_netlabel - Set the secattr on a socket
|
|
|
+ * @sk: the socket
|
|
|
+ *
|
|
|
+ * Convert the outbound smack value (smk_out) to a
|
|
|
+ * secattr and attach it to the socket.
|
|
|
+ *
|
|
|
+ * Returns 0 on success or an error code
|
|
|
+ */
|
|
|
+static int smack_netlabel(struct sock *sk)
|
|
|
+{
|
|
|
+ struct socket_smack *ssp = sk->sk_security;
|
|
|
+ struct netlbl_lsm_secattr secattr;
|
|
|
+ int rc = 0;
|
|
|
+
|
|
|
+ netlbl_secattr_init(&secattr);
|
|
|
+ smack_to_secattr(ssp->smk_out, &secattr);
|
|
|
+ if (secattr.flags != NETLBL_SECATTR_NONE)
|
|
|
+ rc = netlbl_sock_setattr(sk, &secattr);
|
|
|
+
|
|
|
+ netlbl_secattr_destroy(&secattr);
|
|
|
+ return rc;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_inode_setsecurity - set smack xattrs
|
|
|
+ * @inode: the object
|
|
|
+ * @name: attribute name
|
|
|
+ * @value: attribute value
|
|
|
+ * @size: size of the attribute
|
|
|
+ * @flags: unused
|
|
|
+ *
|
|
|
+ * Sets the named attribute in the appropriate blob
|
|
|
+ *
|
|
|
+ * Returns 0 on success, or an error code
|
|
|
+ */
|
|
|
+static int smack_inode_setsecurity(struct inode *inode, const char *name,
|
|
|
+ const void *value, size_t size, int flags)
|
|
|
+{
|
|
|
+ char *sp;
|
|
|
+ struct inode_smack *nsp = inode->i_security;
|
|
|
+ struct socket_smack *ssp;
|
|
|
+ struct socket *sock;
|
|
|
+
|
|
|
+ if (value == NULL || size > SMK_LABELLEN)
|
|
|
+ return -EACCES;
|
|
|
+
|
|
|
+ sp = smk_import(value, size);
|
|
|
+ if (sp == NULL)
|
|
|
+ return -EINVAL;
|
|
|
+
|
|
|
+ if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
|
|
|
+ nsp->smk_inode = sp;
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+ /*
|
|
|
+ * The rest of the Smack xattrs are only on sockets.
|
|
|
+ */
|
|
|
+ if (inode->i_sb->s_magic != SOCKFS_MAGIC)
|
|
|
+ return -EOPNOTSUPP;
|
|
|
+
|
|
|
+ sock = SOCKET_I(inode);
|
|
|
+ if (sock == NULL)
|
|
|
+ return -EOPNOTSUPP;
|
|
|
+
|
|
|
+ ssp = sock->sk->sk_security;
|
|
|
+
|
|
|
+ if (strcmp(name, XATTR_SMACK_IPIN) == 0)
|
|
|
+ ssp->smk_in = sp;
|
|
|
+ else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
|
|
|
+ ssp->smk_out = sp;
|
|
|
+ return smack_netlabel(sock->sk);
|
|
|
+ } else
|
|
|
+ return -EOPNOTSUPP;
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_socket_post_create - finish socket setup
|
|
|
+ * @sock: the socket
|
|
|
+ * @family: protocol family
|
|
|
+ * @type: unused
|
|
|
+ * @protocol: unused
|
|
|
+ * @kern: unused
|
|
|
+ *
|
|
|
+ * Sets the netlabel information on the socket
|
|
|
+ *
|
|
|
+ * Returns 0 on success, and error code otherwise
|
|
|
+ */
|
|
|
+static int smack_socket_post_create(struct socket *sock, int family,
|
|
|
+ int type, int protocol, int kern)
|
|
|
+{
|
|
|
+ if (family != PF_INET)
|
|
|
+ return 0;
|
|
|
+ /*
|
|
|
+ * Set the outbound netlbl.
|
|
|
+ */
|
|
|
+ return smack_netlabel(sock->sk);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_flags_to_may - convert S_ to MAY_ values
|
|
|
+ * @flags: the S_ value
|
|
|
+ *
|
|
|
+ * Returns the equivalent MAY_ value
|
|
|
+ */
|
|
|
+static int smack_flags_to_may(int flags)
|
|
|
+{
|
|
|
+ int may = 0;
|
|
|
+
|
|
|
+ if (flags & S_IRUGO)
|
|
|
+ may |= MAY_READ;
|
|
|
+ if (flags & S_IWUGO)
|
|
|
+ may |= MAY_WRITE;
|
|
|
+ if (flags & S_IXUGO)
|
|
|
+ may |= MAY_EXEC;
|
|
|
+
|
|
|
+ return may;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_msg_msg_alloc_security - Set the security blob for msg_msg
|
|
|
+ * @msg: the object
|
|
|
+ *
|
|
|
+ * Returns 0
|
|
|
+ */
|
|
|
+static int smack_msg_msg_alloc_security(struct msg_msg *msg)
|
|
|
+{
|
|
|
+ msg->security = current->security;
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_msg_msg_free_security - Clear the security blob for msg_msg
|
|
|
+ * @msg: the object
|
|
|
+ *
|
|
|
+ * Clears the blob pointer
|
|
|
+ */
|
|
|
+static void smack_msg_msg_free_security(struct msg_msg *msg)
|
|
|
+{
|
|
|
+ msg->security = NULL;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_of_shm - the smack pointer for the shm
|
|
|
+ * @shp: the object
|
|
|
+ *
|
|
|
+ * Returns a pointer to the smack value
|
|
|
+ */
|
|
|
+static char *smack_of_shm(struct shmid_kernel *shp)
|
|
|
+{
|
|
|
+ return (char *)shp->shm_perm.security;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_shm_alloc_security - Set the security blob for shm
|
|
|
+ * @shp: the object
|
|
|
+ *
|
|
|
+ * Returns 0
|
|
|
+ */
|
|
|
+static int smack_shm_alloc_security(struct shmid_kernel *shp)
|
|
|
+{
|
|
|
+ struct kern_ipc_perm *isp = &shp->shm_perm;
|
|
|
+
|
|
|
+ isp->security = current->security;
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_shm_free_security - Clear the security blob for shm
|
|
|
+ * @shp: the object
|
|
|
+ *
|
|
|
+ * Clears the blob pointer
|
|
|
+ */
|
|
|
+static void smack_shm_free_security(struct shmid_kernel *shp)
|
|
|
+{
|
|
|
+ struct kern_ipc_perm *isp = &shp->shm_perm;
|
|
|
+
|
|
|
+ isp->security = NULL;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_shm_associate - Smack access check for shm
|
|
|
+ * @shp: the object
|
|
|
+ * @shmflg: access requested
|
|
|
+ *
|
|
|
+ * Returns 0 if current has the requested access, error code otherwise
|
|
|
+ */
|
|
|
+static int smack_shm_associate(struct shmid_kernel *shp, int shmflg)
|
|
|
+{
|
|
|
+ char *ssp = smack_of_shm(shp);
|
|
|
+ int may;
|
|
|
+
|
|
|
+ may = smack_flags_to_may(shmflg);
|
|
|
+ return smk_curacc(ssp, may);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_shm_shmctl - Smack access check for shm
|
|
|
+ * @shp: the object
|
|
|
+ * @cmd: what it wants to do
|
|
|
+ *
|
|
|
+ * Returns 0 if current has the requested access, error code otherwise
|
|
|
+ */
|
|
|
+static int smack_shm_shmctl(struct shmid_kernel *shp, int cmd)
|
|
|
+{
|
|
|
+ char *ssp = smack_of_shm(shp);
|
|
|
+ int may;
|
|
|
+
|
|
|
+ switch (cmd) {
|
|
|
+ case IPC_STAT:
|
|
|
+ case SHM_STAT:
|
|
|
+ may = MAY_READ;
|
|
|
+ break;
|
|
|
+ case IPC_SET:
|
|
|
+ case SHM_LOCK:
|
|
|
+ case SHM_UNLOCK:
|
|
|
+ case IPC_RMID:
|
|
|
+ may = MAY_READWRITE;
|
|
|
+ break;
|
|
|
+ case IPC_INFO:
|
|
|
+ case SHM_INFO:
|
|
|
+ /*
|
|
|
+ * System level information.
|
|
|
+ */
|
|
|
+ return 0;
|
|
|
+ default:
|
|
|
+ return -EINVAL;
|
|
|
+ }
|
|
|
+
|
|
|
+ return smk_curacc(ssp, may);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_shm_shmat - Smack access for shmat
|
|
|
+ * @shp: the object
|
|
|
+ * @shmaddr: unused
|
|
|
+ * @shmflg: access requested
|
|
|
+ *
|
|
|
+ * Returns 0 if current has the requested access, error code otherwise
|
|
|
+ */
|
|
|
+static int smack_shm_shmat(struct shmid_kernel *shp, char __user *shmaddr,
|
|
|
+ int shmflg)
|
|
|
+{
|
|
|
+ char *ssp = smack_of_shm(shp);
|
|
|
+ int may;
|
|
|
+
|
|
|
+ may = smack_flags_to_may(shmflg);
|
|
|
+ return smk_curacc(ssp, may);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_of_sem - the smack pointer for the sem
|
|
|
+ * @sma: the object
|
|
|
+ *
|
|
|
+ * Returns a pointer to the smack value
|
|
|
+ */
|
|
|
+static char *smack_of_sem(struct sem_array *sma)
|
|
|
+{
|
|
|
+ return (char *)sma->sem_perm.security;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_sem_alloc_security - Set the security blob for sem
|
|
|
+ * @sma: the object
|
|
|
+ *
|
|
|
+ * Returns 0
|
|
|
+ */
|
|
|
+static int smack_sem_alloc_security(struct sem_array *sma)
|
|
|
+{
|
|
|
+ struct kern_ipc_perm *isp = &sma->sem_perm;
|
|
|
+
|
|
|
+ isp->security = current->security;
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_sem_free_security - Clear the security blob for sem
|
|
|
+ * @sma: the object
|
|
|
+ *
|
|
|
+ * Clears the blob pointer
|
|
|
+ */
|
|
|
+static void smack_sem_free_security(struct sem_array *sma)
|
|
|
+{
|
|
|
+ struct kern_ipc_perm *isp = &sma->sem_perm;
|
|
|
+
|
|
|
+ isp->security = NULL;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_sem_associate - Smack access check for sem
|
|
|
+ * @sma: the object
|
|
|
+ * @semflg: access requested
|
|
|
+ *
|
|
|
+ * Returns 0 if current has the requested access, error code otherwise
|
|
|
+ */
|
|
|
+static int smack_sem_associate(struct sem_array *sma, int semflg)
|
|
|
+{
|
|
|
+ char *ssp = smack_of_sem(sma);
|
|
|
+ int may;
|
|
|
+
|
|
|
+ may = smack_flags_to_may(semflg);
|
|
|
+ return smk_curacc(ssp, may);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_sem_shmctl - Smack access check for sem
|
|
|
+ * @sma: the object
|
|
|
+ * @cmd: what it wants to do
|
|
|
+ *
|
|
|
+ * Returns 0 if current has the requested access, error code otherwise
|
|
|
+ */
|
|
|
+static int smack_sem_semctl(struct sem_array *sma, int cmd)
|
|
|
+{
|
|
|
+ char *ssp = smack_of_sem(sma);
|
|
|
+ int may;
|
|
|
+
|
|
|
+ switch (cmd) {
|
|
|
+ case GETPID:
|
|
|
+ case GETNCNT:
|
|
|
+ case GETZCNT:
|
|
|
+ case GETVAL:
|
|
|
+ case GETALL:
|
|
|
+ case IPC_STAT:
|
|
|
+ case SEM_STAT:
|
|
|
+ may = MAY_READ;
|
|
|
+ break;
|
|
|
+ case SETVAL:
|
|
|
+ case SETALL:
|
|
|
+ case IPC_RMID:
|
|
|
+ case IPC_SET:
|
|
|
+ may = MAY_READWRITE;
|
|
|
+ break;
|
|
|
+ case IPC_INFO:
|
|
|
+ case SEM_INFO:
|
|
|
+ /*
|
|
|
+ * System level information
|
|
|
+ */
|
|
|
+ return 0;
|
|
|
+ default:
|
|
|
+ return -EINVAL;
|
|
|
+ }
|
|
|
+
|
|
|
+ return smk_curacc(ssp, may);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_sem_semop - Smack checks of semaphore operations
|
|
|
+ * @sma: the object
|
|
|
+ * @sops: unused
|
|
|
+ * @nsops: unused
|
|
|
+ * @alter: unused
|
|
|
+ *
|
|
|
+ * Treated as read and write in all cases.
|
|
|
+ *
|
|
|
+ * Returns 0 if access is allowed, error code otherwise
|
|
|
+ */
|
|
|
+static int smack_sem_semop(struct sem_array *sma, struct sembuf *sops,
|
|
|
+ unsigned nsops, int alter)
|
|
|
+{
|
|
|
+ char *ssp = smack_of_sem(sma);
|
|
|
+
|
|
|
+ return smk_curacc(ssp, MAY_READWRITE);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_msg_alloc_security - Set the security blob for msg
|
|
|
+ * @msq: the object
|
|
|
+ *
|
|
|
+ * Returns 0
|
|
|
+ */
|
|
|
+static int smack_msg_queue_alloc_security(struct msg_queue *msq)
|
|
|
+{
|
|
|
+ struct kern_ipc_perm *kisp = &msq->q_perm;
|
|
|
+
|
|
|
+ kisp->security = current->security;
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_msg_free_security - Clear the security blob for msg
|
|
|
+ * @msq: the object
|
|
|
+ *
|
|
|
+ * Clears the blob pointer
|
|
|
+ */
|
|
|
+static void smack_msg_queue_free_security(struct msg_queue *msq)
|
|
|
+{
|
|
|
+ struct kern_ipc_perm *kisp = &msq->q_perm;
|
|
|
+
|
|
|
+ kisp->security = NULL;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_of_msq - the smack pointer for the msq
|
|
|
+ * @msq: the object
|
|
|
+ *
|
|
|
+ * Returns a pointer to the smack value
|
|
|
+ */
|
|
|
+static char *smack_of_msq(struct msg_queue *msq)
|
|
|
+{
|
|
|
+ return (char *)msq->q_perm.security;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_msg_queue_associate - Smack access check for msg_queue
|
|
|
+ * @msq: the object
|
|
|
+ * @msqflg: access requested
|
|
|
+ *
|
|
|
+ * Returns 0 if current has the requested access, error code otherwise
|
|
|
+ */
|
|
|
+static int smack_msg_queue_associate(struct msg_queue *msq, int msqflg)
|
|
|
+{
|
|
|
+ char *msp = smack_of_msq(msq);
|
|
|
+ int may;
|
|
|
+
|
|
|
+ may = smack_flags_to_may(msqflg);
|
|
|
+ return smk_curacc(msp, may);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_msg_queue_msgctl - Smack access check for msg_queue
|
|
|
+ * @msq: the object
|
|
|
+ * @cmd: what it wants to do
|
|
|
+ *
|
|
|
+ * Returns 0 if current has the requested access, error code otherwise
|
|
|
+ */
|
|
|
+static int smack_msg_queue_msgctl(struct msg_queue *msq, int cmd)
|
|
|
+{
|
|
|
+ char *msp = smack_of_msq(msq);
|
|
|
+ int may;
|
|
|
+
|
|
|
+ switch (cmd) {
|
|
|
+ case IPC_STAT:
|
|
|
+ case MSG_STAT:
|
|
|
+ may = MAY_READ;
|
|
|
+ break;
|
|
|
+ case IPC_SET:
|
|
|
+ case IPC_RMID:
|
|
|
+ may = MAY_READWRITE;
|
|
|
+ break;
|
|
|
+ case IPC_INFO:
|
|
|
+ case MSG_INFO:
|
|
|
+ /*
|
|
|
+ * System level information
|
|
|
+ */
|
|
|
+ return 0;
|
|
|
+ default:
|
|
|
+ return -EINVAL;
|
|
|
+ }
|
|
|
+
|
|
|
+ return smk_curacc(msp, may);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_msg_queue_msgsnd - Smack access check for msg_queue
|
|
|
+ * @msq: the object
|
|
|
+ * @msg: unused
|
|
|
+ * @msqflg: access requested
|
|
|
+ *
|
|
|
+ * Returns 0 if current has the requested access, error code otherwise
|
|
|
+ */
|
|
|
+static int smack_msg_queue_msgsnd(struct msg_queue *msq, struct msg_msg *msg,
|
|
|
+ int msqflg)
|
|
|
+{
|
|
|
+ char *msp = smack_of_msq(msq);
|
|
|
+ int rc;
|
|
|
+
|
|
|
+ rc = smack_flags_to_may(msqflg);
|
|
|
+ return smk_curacc(msp, rc);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_msg_queue_msgsnd - Smack access check for msg_queue
|
|
|
+ * @msq: the object
|
|
|
+ * @msg: unused
|
|
|
+ * @target: unused
|
|
|
+ * @type: unused
|
|
|
+ * @mode: unused
|
|
|
+ *
|
|
|
+ * Returns 0 if current has read and write access, error code otherwise
|
|
|
+ */
|
|
|
+static int smack_msg_queue_msgrcv(struct msg_queue *msq, struct msg_msg *msg,
|
|
|
+ struct task_struct *target, long type, int mode)
|
|
|
+{
|
|
|
+ char *msp = smack_of_msq(msq);
|
|
|
+
|
|
|
+ return smk_curacc(msp, MAY_READWRITE);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_ipc_permission - Smack access for ipc_permission()
|
|
|
+ * @ipp: the object permissions
|
|
|
+ * @flag: access requested
|
|
|
+ *
|
|
|
+ * Returns 0 if current has read and write access, error code otherwise
|
|
|
+ */
|
|
|
+static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
|
|
|
+{
|
|
|
+ char *isp = ipp->security;
|
|
|
+ int may;
|
|
|
+
|
|
|
+ may = smack_flags_to_may(flag);
|
|
|
+ return smk_curacc(isp, may);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_d_instantiate - Make sure the blob is correct on an inode
|
|
|
+ * @opt_dentry: unused
|
|
|
+ * @inode: the object
|
|
|
+ *
|
|
|
+ * Set the inode's security blob if it hasn't been done already.
|
|
|
+ */
|
|
|
+static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
|
|
|
+{
|
|
|
+ struct super_block *sbp;
|
|
|
+ struct superblock_smack *sbsp;
|
|
|
+ struct inode_smack *isp;
|
|
|
+ char *csp = current->security;
|
|
|
+ char *fetched;
|
|
|
+ char *final;
|
|
|
+ struct dentry *dp;
|
|
|
+
|
|
|
+ if (inode == NULL)
|
|
|
+ return;
|
|
|
+
|
|
|
+ isp = inode->i_security;
|
|
|
+
|
|
|
+ mutex_lock(&isp->smk_lock);
|
|
|
+ /*
|
|
|
+ * If the inode is already instantiated
|
|
|
+ * take the quick way out
|
|
|
+ */
|
|
|
+ if (isp->smk_flags & SMK_INODE_INSTANT)
|
|
|
+ goto unlockandout;
|
|
|
+
|
|
|
+ sbp = inode->i_sb;
|
|
|
+ sbsp = sbp->s_security;
|
|
|
+ /*
|
|
|
+ * We're going to use the superblock default label
|
|
|
+ * if there's no label on the file.
|
|
|
+ */
|
|
|
+ final = sbsp->smk_default;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * This is pretty hackish.
|
|
|
+ * Casey says that we shouldn't have to do
|
|
|
+ * file system specific code, but it does help
|
|
|
+ * with keeping it simple.
|
|
|
+ */
|
|
|
+ switch (sbp->s_magic) {
|
|
|
+ case SMACK_MAGIC:
|
|
|
+ /*
|
|
|
+ * Casey says that it's a little embarassing
|
|
|
+ * that the smack file system doesn't do
|
|
|
+ * extended attributes.
|
|
|
+ */
|
|
|
+ final = smack_known_star.smk_known;
|
|
|
+ break;
|
|
|
+ case PIPEFS_MAGIC:
|
|
|
+ /*
|
|
|
+ * Casey says pipes are easy (?)
|
|
|
+ */
|
|
|
+ final = smack_known_star.smk_known;
|
|
|
+ break;
|
|
|
+ case DEVPTS_SUPER_MAGIC:
|
|
|
+ /*
|
|
|
+ * devpts seems content with the label of the task.
|
|
|
+ * Programs that change smack have to treat the
|
|
|
+ * pty with respect.
|
|
|
+ */
|
|
|
+ final = csp;
|
|
|
+ break;
|
|
|
+ case SOCKFS_MAGIC:
|
|
|
+ /*
|
|
|
+ * Casey says sockets get the smack of the task.
|
|
|
+ */
|
|
|
+ final = csp;
|
|
|
+ break;
|
|
|
+ case PROC_SUPER_MAGIC:
|
|
|
+ /*
|
|
|
+ * Casey says procfs appears not to care.
|
|
|
+ * The superblock default suffices.
|
|
|
+ */
|
|
|
+ break;
|
|
|
+ case TMPFS_MAGIC:
|
|
|
+ /*
|
|
|
+ * Device labels should come from the filesystem,
|
|
|
+ * but watch out, because they're volitile,
|
|
|
+ * getting recreated on every reboot.
|
|
|
+ */
|
|
|
+ final = smack_known_star.smk_known;
|
|
|
+ /*
|
|
|
+ * No break.
|
|
|
+ *
|
|
|
+ * If a smack value has been set we want to use it,
|
|
|
+ * but since tmpfs isn't giving us the opportunity
|
|
|
+ * to set mount options simulate setting the
|
|
|
+ * superblock default.
|
|
|
+ */
|
|
|
+ default:
|
|
|
+ /*
|
|
|
+ * This isn't an understood special case.
|
|
|
+ * Get the value from the xattr.
|
|
|
+ *
|
|
|
+ * No xattr support means, alas, no SMACK label.
|
|
|
+ * Use the aforeapplied default.
|
|
|
+ * It would be curious if the label of the task
|
|
|
+ * does not match that assigned.
|
|
|
+ */
|
|
|
+ if (inode->i_op->getxattr == NULL)
|
|
|
+ break;
|
|
|
+ /*
|
|
|
+ * Get the dentry for xattr.
|
|
|
+ */
|
|
|
+ if (opt_dentry == NULL) {
|
|
|
+ dp = d_find_alias(inode);
|
|
|
+ if (dp == NULL)
|
|
|
+ break;
|
|
|
+ } else {
|
|
|
+ dp = dget(opt_dentry);
|
|
|
+ if (dp == NULL)
|
|
|
+ break;
|
|
|
+ }
|
|
|
+
|
|
|
+ fetched = smk_fetch(inode, dp);
|
|
|
+ if (fetched != NULL)
|
|
|
+ final = fetched;
|
|
|
+
|
|
|
+ dput(dp);
|
|
|
+ break;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (final == NULL)
|
|
|
+ isp->smk_inode = csp;
|
|
|
+ else
|
|
|
+ isp->smk_inode = final;
|
|
|
+
|
|
|
+ isp->smk_flags |= SMK_INODE_INSTANT;
|
|
|
+
|
|
|
+unlockandout:
|
|
|
+ mutex_unlock(&isp->smk_lock);
|
|
|
+ return;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_getprocattr - Smack process attribute access
|
|
|
+ * @p: the object task
|
|
|
+ * @name: the name of the attribute in /proc/.../attr
|
|
|
+ * @value: where to put the result
|
|
|
+ *
|
|
|
+ * Places a copy of the task Smack into value
|
|
|
+ *
|
|
|
+ * Returns the length of the smack label or an error code
|
|
|
+ */
|
|
|
+static int smack_getprocattr(struct task_struct *p, char *name, char **value)
|
|
|
+{
|
|
|
+ char *cp;
|
|
|
+ int slen;
|
|
|
+
|
|
|
+ if (strcmp(name, "current") != 0)
|
|
|
+ return -EINVAL;
|
|
|
+
|
|
|
+ cp = kstrdup(p->security, GFP_KERNEL);
|
|
|
+ if (cp == NULL)
|
|
|
+ return -ENOMEM;
|
|
|
+
|
|
|
+ slen = strlen(cp);
|
|
|
+ *value = cp;
|
|
|
+ return slen;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_setprocattr - Smack process attribute setting
|
|
|
+ * @p: the object task
|
|
|
+ * @name: the name of the attribute in /proc/.../attr
|
|
|
+ * @value: the value to set
|
|
|
+ * @size: the size of the value
|
|
|
+ *
|
|
|
+ * Sets the Smack value of the task. Only setting self
|
|
|
+ * is permitted and only with privilege
|
|
|
+ *
|
|
|
+ * Returns the length of the smack label or an error code
|
|
|
+ */
|
|
|
+static int smack_setprocattr(struct task_struct *p, char *name,
|
|
|
+ void *value, size_t size)
|
|
|
+{
|
|
|
+ char *newsmack;
|
|
|
+
|
|
|
+ if (!__capable(p, CAP_MAC_ADMIN))
|
|
|
+ return -EPERM;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Changing another process' Smack value is too dangerous
|
|
|
+ * and supports no sane use case.
|
|
|
+ */
|
|
|
+ if (p != current)
|
|
|
+ return -EPERM;
|
|
|
+
|
|
|
+ if (value == NULL || size == 0 || size >= SMK_LABELLEN)
|
|
|
+ return -EINVAL;
|
|
|
+
|
|
|
+ if (strcmp(name, "current") != 0)
|
|
|
+ return -EINVAL;
|
|
|
+
|
|
|
+ newsmack = smk_import(value, size);
|
|
|
+ if (newsmack == NULL)
|
|
|
+ return -EINVAL;
|
|
|
+
|
|
|
+ p->security = newsmack;
|
|
|
+ return size;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_unix_stream_connect - Smack access on UDS
|
|
|
+ * @sock: one socket
|
|
|
+ * @other: the other socket
|
|
|
+ * @newsk: unused
|
|
|
+ *
|
|
|
+ * Return 0 if a subject with the smack of sock could access
|
|
|
+ * an object with the smack of other, otherwise an error code
|
|
|
+ */
|
|
|
+static int smack_unix_stream_connect(struct socket *sock,
|
|
|
+ struct socket *other, struct sock *newsk)
|
|
|
+{
|
|
|
+ struct inode *sp = SOCK_INODE(sock);
|
|
|
+ struct inode *op = SOCK_INODE(other);
|
|
|
+
|
|
|
+ return smk_access(smk_of_inode(sp), smk_of_inode(op), MAY_READWRITE);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_unix_may_send - Smack access on UDS
|
|
|
+ * @sock: one socket
|
|
|
+ * @other: the other socket
|
|
|
+ *
|
|
|
+ * Return 0 if a subject with the smack of sock could access
|
|
|
+ * an object with the smack of other, otherwise an error code
|
|
|
+ */
|
|
|
+static int smack_unix_may_send(struct socket *sock, struct socket *other)
|
|
|
+{
|
|
|
+ struct inode *sp = SOCK_INODE(sock);
|
|
|
+ struct inode *op = SOCK_INODE(other);
|
|
|
+
|
|
|
+ return smk_access(smk_of_inode(sp), smk_of_inode(op), MAY_WRITE);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_from_secattr - Convert a netlabel attr.mls.lvl/attr.mls.cat
|
|
|
+ * pair to smack
|
|
|
+ * @sap: netlabel secattr
|
|
|
+ * @sip: where to put the result
|
|
|
+ *
|
|
|
+ * Copies a smack label into sip
|
|
|
+ */
|
|
|
+static void smack_from_secattr(struct netlbl_lsm_secattr *sap, char *sip)
|
|
|
+{
|
|
|
+ char smack[SMK_LABELLEN];
|
|
|
+ int pcat;
|
|
|
+
|
|
|
+ if ((sap->flags & NETLBL_SECATTR_MLS_LVL) == 0) {
|
|
|
+ /*
|
|
|
+ * If there are flags but no level netlabel isn't
|
|
|
+ * behaving the way we expect it to.
|
|
|
+ *
|
|
|
+ * Without guidance regarding the smack value
|
|
|
+ * for the packet fall back on the network
|
|
|
+ * ambient value.
|
|
|
+ */
|
|
|
+ strncpy(sip, smack_net_ambient, SMK_MAXLEN);
|
|
|
+ return;
|
|
|
+ }
|
|
|
+ /*
|
|
|
+ * Get the categories, if any
|
|
|
+ */
|
|
|
+ memset(smack, '\0', SMK_LABELLEN);
|
|
|
+ if ((sap->flags & NETLBL_SECATTR_MLS_CAT) != 0)
|
|
|
+ for (pcat = -1;;) {
|
|
|
+ pcat = netlbl_secattr_catmap_walk(sap->attr.mls.cat,
|
|
|
+ pcat + 1);
|
|
|
+ if (pcat < 0)
|
|
|
+ break;
|
|
|
+ smack_catset_bit(pcat, smack);
|
|
|
+ }
|
|
|
+ /*
|
|
|
+ * If it is CIPSO using smack direct mapping
|
|
|
+ * we are already done. WeeHee.
|
|
|
+ */
|
|
|
+ if (sap->attr.mls.lvl == smack_cipso_direct) {
|
|
|
+ memcpy(sip, smack, SMK_MAXLEN);
|
|
|
+ return;
|
|
|
+ }
|
|
|
+ /*
|
|
|
+ * Look it up in the supplied table if it is not a direct mapping.
|
|
|
+ */
|
|
|
+ smack_from_cipso(sap->attr.mls.lvl, smack, sip);
|
|
|
+ return;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_socket_sock_rcv_skb - Smack packet delivery access check
|
|
|
+ * @sk: socket
|
|
|
+ * @skb: packet
|
|
|
+ *
|
|
|
+ * Returns 0 if the packet should be delivered, an error code otherwise
|
|
|
+ */
|
|
|
+static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
|
|
|
+{
|
|
|
+ struct netlbl_lsm_secattr secattr;
|
|
|
+ struct socket_smack *ssp = sk->sk_security;
|
|
|
+ char smack[SMK_LABELLEN];
|
|
|
+ int rc;
|
|
|
+
|
|
|
+ if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)
|
|
|
+ return 0;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Translate what netlabel gave us.
|
|
|
+ */
|
|
|
+ memset(smack, '\0', SMK_LABELLEN);
|
|
|
+ netlbl_secattr_init(&secattr);
|
|
|
+ rc = netlbl_skbuff_getattr(skb, sk->sk_family, &secattr);
|
|
|
+ if (rc == 0)
|
|
|
+ smack_from_secattr(&secattr, smack);
|
|
|
+ else
|
|
|
+ strncpy(smack, smack_net_ambient, SMK_MAXLEN);
|
|
|
+ netlbl_secattr_destroy(&secattr);
|
|
|
+ /*
|
|
|
+ * Receiving a packet requires that the other end
|
|
|
+ * be able to write here. Read access is not required.
|
|
|
+ * This is the simplist possible security model
|
|
|
+ * for networking.
|
|
|
+ */
|
|
|
+ return smk_access(smack, ssp->smk_in, MAY_WRITE);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_socket_getpeersec_stream - pull in packet label
|
|
|
+ * @sock: the socket
|
|
|
+ * @optval: user's destination
|
|
|
+ * @optlen: size thereof
|
|
|
+ * @len: max thereoe
|
|
|
+ *
|
|
|
+ * returns zero on success, an error code otherwise
|
|
|
+ */
|
|
|
+static int smack_socket_getpeersec_stream(struct socket *sock,
|
|
|
+ char __user *optval,
|
|
|
+ int __user *optlen, unsigned len)
|
|
|
+{
|
|
|
+ struct socket_smack *ssp;
|
|
|
+ int slen;
|
|
|
+ int rc = 0;
|
|
|
+
|
|
|
+ ssp = sock->sk->sk_security;
|
|
|
+ slen = strlen(ssp->smk_packet) + 1;
|
|
|
+
|
|
|
+ if (slen > len)
|
|
|
+ rc = -ERANGE;
|
|
|
+ else if (copy_to_user(optval, ssp->smk_packet, slen) != 0)
|
|
|
+ rc = -EFAULT;
|
|
|
+
|
|
|
+ if (put_user(slen, optlen) != 0)
|
|
|
+ rc = -EFAULT;
|
|
|
+
|
|
|
+ return rc;
|
|
|
+}
|
|
|
+
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_socket_getpeersec_dgram - pull in packet label
|
|
|
+ * @sock: the socket
|
|
|
+ * @skb: packet data
|
|
|
+ * @secid: pointer to where to put the secid of the packet
|
|
|
+ *
|
|
|
+ * Sets the netlabel socket state on sk from parent
|
|
|
+ */
|
|
|
+static int smack_socket_getpeersec_dgram(struct socket *sock,
|
|
|
+ struct sk_buff *skb, u32 *secid)
|
|
|
+
|
|
|
+{
|
|
|
+ struct netlbl_lsm_secattr secattr;
|
|
|
+ struct sock *sk;
|
|
|
+ char smack[SMK_LABELLEN];
|
|
|
+ int family = PF_INET;
|
|
|
+ u32 s;
|
|
|
+ int rc;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Only works for families with packets.
|
|
|
+ */
|
|
|
+ if (sock != NULL) {
|
|
|
+ sk = sock->sk;
|
|
|
+ if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)
|
|
|
+ return 0;
|
|
|
+ family = sk->sk_family;
|
|
|
+ }
|
|
|
+ /*
|
|
|
+ * Translate what netlabel gave us.
|
|
|
+ */
|
|
|
+ memset(smack, '\0', SMK_LABELLEN);
|
|
|
+ netlbl_secattr_init(&secattr);
|
|
|
+ rc = netlbl_skbuff_getattr(skb, family, &secattr);
|
|
|
+ if (rc == 0)
|
|
|
+ smack_from_secattr(&secattr, smack);
|
|
|
+ netlbl_secattr_destroy(&secattr);
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Give up if we couldn't get anything
|
|
|
+ */
|
|
|
+ if (rc != 0)
|
|
|
+ return rc;
|
|
|
+
|
|
|
+ s = smack_to_secid(smack);
|
|
|
+ if (s == 0)
|
|
|
+ return -EINVAL;
|
|
|
+
|
|
|
+ *secid = s;
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_sock_graft - graft access state between two sockets
|
|
|
+ * @sk: fresh sock
|
|
|
+ * @parent: donor socket
|
|
|
+ *
|
|
|
+ * Sets the netlabel socket state on sk from parent
|
|
|
+ */
|
|
|
+static void smack_sock_graft(struct sock *sk, struct socket *parent)
|
|
|
+{
|
|
|
+ struct socket_smack *ssp;
|
|
|
+ int rc;
|
|
|
+
|
|
|
+ if (sk == NULL)
|
|
|
+ return;
|
|
|
+
|
|
|
+ if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6)
|
|
|
+ return;
|
|
|
+
|
|
|
+ ssp = sk->sk_security;
|
|
|
+ ssp->smk_in = current->security;
|
|
|
+ ssp->smk_out = current->security;
|
|
|
+ ssp->smk_packet[0] = '\0';
|
|
|
+
|
|
|
+ rc = smack_netlabel(sk);
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_inet_conn_request - Smack access check on connect
|
|
|
+ * @sk: socket involved
|
|
|
+ * @skb: packet
|
|
|
+ * @req: unused
|
|
|
+ *
|
|
|
+ * Returns 0 if a task with the packet label could write to
|
|
|
+ * the socket, otherwise an error code
|
|
|
+ */
|
|
|
+static int smack_inet_conn_request(struct sock *sk, struct sk_buff *skb,
|
|
|
+ struct request_sock *req)
|
|
|
+{
|
|
|
+ struct netlbl_lsm_secattr skb_secattr;
|
|
|
+ struct socket_smack *ssp = sk->sk_security;
|
|
|
+ char smack[SMK_LABELLEN];
|
|
|
+ int rc;
|
|
|
+
|
|
|
+ if (skb == NULL)
|
|
|
+ return -EACCES;
|
|
|
+
|
|
|
+ memset(smack, '\0', SMK_LABELLEN);
|
|
|
+ netlbl_secattr_init(&skb_secattr);
|
|
|
+ rc = netlbl_skbuff_getattr(skb, sk->sk_family, &skb_secattr);
|
|
|
+ if (rc == 0)
|
|
|
+ smack_from_secattr(&skb_secattr, smack);
|
|
|
+ else
|
|
|
+ strncpy(smack, smack_known_huh.smk_known, SMK_MAXLEN);
|
|
|
+ netlbl_secattr_destroy(&skb_secattr);
|
|
|
+ /*
|
|
|
+ * Receiving a packet requires that the other end
|
|
|
+ * be able to write here. Read access is not required.
|
|
|
+ *
|
|
|
+ * If the request is successful save the peer's label
|
|
|
+ * so that SO_PEERCRED can report it.
|
|
|
+ */
|
|
|
+ rc = smk_access(smack, ssp->smk_in, MAY_WRITE);
|
|
|
+ if (rc == 0)
|
|
|
+ strncpy(ssp->smk_packet, smack, SMK_MAXLEN);
|
|
|
+
|
|
|
+ return rc;
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ * Key management security hooks
|
|
|
+ *
|
|
|
+ * Casey has not tested key support very heavily.
|
|
|
+ * The permission check is most likely too restrictive.
|
|
|
+ * If you care about keys please have a look.
|
|
|
+ */
|
|
|
+#ifdef CONFIG_KEYS
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_key_alloc - Set the key security blob
|
|
|
+ * @key: object
|
|
|
+ * @tsk: the task associated with the key
|
|
|
+ * @flags: unused
|
|
|
+ *
|
|
|
+ * No allocation required
|
|
|
+ *
|
|
|
+ * Returns 0
|
|
|
+ */
|
|
|
+static int smack_key_alloc(struct key *key, struct task_struct *tsk,
|
|
|
+ unsigned long flags)
|
|
|
+{
|
|
|
+ key->security = tsk->security;
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_key_free - Clear the key security blob
|
|
|
+ * @key: the object
|
|
|
+ *
|
|
|
+ * Clear the blob pointer
|
|
|
+ */
|
|
|
+static void smack_key_free(struct key *key)
|
|
|
+{
|
|
|
+ key->security = NULL;
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ * smack_key_permission - Smack access on a key
|
|
|
+ * @key_ref: gets to the object
|
|
|
+ * @context: task involved
|
|
|
+ * @perm: unused
|
|
|
+ *
|
|
|
+ * Return 0 if the task has read and write to the object,
|
|
|
+ * an error code otherwise
|
|
|
+ */
|
|
|
+static int smack_key_permission(key_ref_t key_ref,
|
|
|
+ struct task_struct *context, key_perm_t perm)
|
|
|
+{
|
|
|
+ struct key *keyp;
|
|
|
+
|
|
|
+ keyp = key_ref_to_ptr(key_ref);
|
|
|
+ if (keyp == NULL)
|
|
|
+ return -EINVAL;
|
|
|
+ /*
|
|
|
+ * If the key hasn't been initialized give it access so that
|
|
|
+ * it may do so.
|
|
|
+ */
|
|
|
+ if (keyp->security == NULL)
|
|
|
+ return 0;
|
|
|
+ /*
|
|
|
+ * This should not occur
|
|
|
+ */
|
|
|
+ if (context->security == NULL)
|
|
|
+ return -EACCES;
|
|
|
+
|
|
|
+ return smk_access(context->security, keyp->security, MAY_READWRITE);
|
|
|
+}
|
|
|
+#endif /* CONFIG_KEYS */
|
|
|
+
|
|
|
+/*
|
|
|
+ * smack_secid_to_secctx - return the smack label for a secid
|
|
|
+ * @secid: incoming integer
|
|
|
+ * @secdata: destination
|
|
|
+ * @seclen: how long it is
|
|
|
+ *
|
|
|
+ * Exists for networking code.
|
|
|
+ */
|
|
|
+static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
|
|
|
+{
|
|
|
+ char *sp = smack_from_secid(secid);
|
|
|
+
|
|
|
+ *secdata = sp;
|
|
|
+ *seclen = strlen(sp);
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ * smack_release_secctx - don't do anything.
|
|
|
+ * @key_ref: unused
|
|
|
+ * @context: unused
|
|
|
+ * @perm: unused
|
|
|
+ *
|
|
|
+ * Exists to make sure nothing gets done, and properly
|
|
|
+ */
|
|
|
+static void smack_release_secctx(char *secdata, u32 seclen)
|
|
|
+{
|
|
|
+}
|
|
|
+
|
|
|
+static struct security_operations smack_ops = {
|
|
|
+ .ptrace = smack_ptrace,
|
|
|
+ .capget = cap_capget,
|
|
|
+ .capset_check = cap_capset_check,
|
|
|
+ .capset_set = cap_capset_set,
|
|
|
+ .capable = cap_capable,
|
|
|
+ .syslog = smack_syslog,
|
|
|
+ .settime = cap_settime,
|
|
|
+ .vm_enough_memory = cap_vm_enough_memory,
|
|
|
+
|
|
|
+ .bprm_apply_creds = cap_bprm_apply_creds,
|
|
|
+ .bprm_set_security = cap_bprm_set_security,
|
|
|
+ .bprm_secureexec = cap_bprm_secureexec,
|
|
|
+
|
|
|
+ .sb_alloc_security = smack_sb_alloc_security,
|
|
|
+ .sb_free_security = smack_sb_free_security,
|
|
|
+ .sb_copy_data = smack_sb_copy_data,
|
|
|
+ .sb_kern_mount = smack_sb_kern_mount,
|
|
|
+ .sb_statfs = smack_sb_statfs,
|
|
|
+ .sb_mount = smack_sb_mount,
|
|
|
+ .sb_umount = smack_sb_umount,
|
|
|
+
|
|
|
+ .inode_alloc_security = smack_inode_alloc_security,
|
|
|
+ .inode_free_security = smack_inode_free_security,
|
|
|
+ .inode_init_security = smack_inode_init_security,
|
|
|
+ .inode_link = smack_inode_link,
|
|
|
+ .inode_unlink = smack_inode_unlink,
|
|
|
+ .inode_rmdir = smack_inode_rmdir,
|
|
|
+ .inode_rename = smack_inode_rename,
|
|
|
+ .inode_permission = smack_inode_permission,
|
|
|
+ .inode_setattr = smack_inode_setattr,
|
|
|
+ .inode_getattr = smack_inode_getattr,
|
|
|
+ .inode_setxattr = smack_inode_setxattr,
|
|
|
+ .inode_post_setxattr = smack_inode_post_setxattr,
|
|
|
+ .inode_getxattr = smack_inode_getxattr,
|
|
|
+ .inode_removexattr = smack_inode_removexattr,
|
|
|
+ .inode_getsecurity = smack_inode_getsecurity,
|
|
|
+ .inode_setsecurity = smack_inode_setsecurity,
|
|
|
+ .inode_listsecurity = smack_inode_listsecurity,
|
|
|
+
|
|
|
+ .file_permission = smack_file_permission,
|
|
|
+ .file_alloc_security = smack_file_alloc_security,
|
|
|
+ .file_free_security = smack_file_free_security,
|
|
|
+ .file_ioctl = smack_file_ioctl,
|
|
|
+ .file_lock = smack_file_lock,
|
|
|
+ .file_fcntl = smack_file_fcntl,
|
|
|
+ .file_set_fowner = smack_file_set_fowner,
|
|
|
+ .file_send_sigiotask = smack_file_send_sigiotask,
|
|
|
+ .file_receive = smack_file_receive,
|
|
|
+
|
|
|
+ .task_alloc_security = smack_task_alloc_security,
|
|
|
+ .task_free_security = smack_task_free_security,
|
|
|
+ .task_post_setuid = cap_task_post_setuid,
|
|
|
+ .task_setpgid = smack_task_setpgid,
|
|
|
+ .task_getpgid = smack_task_getpgid,
|
|
|
+ .task_getsid = smack_task_getsid,
|
|
|
+ .task_getsecid = smack_task_getsecid,
|
|
|
+ .task_setnice = smack_task_setnice,
|
|
|
+ .task_setioprio = smack_task_setioprio,
|
|
|
+ .task_getioprio = smack_task_getioprio,
|
|
|
+ .task_setscheduler = smack_task_setscheduler,
|
|
|
+ .task_getscheduler = smack_task_getscheduler,
|
|
|
+ .task_movememory = smack_task_movememory,
|
|
|
+ .task_kill = smack_task_kill,
|
|
|
+ .task_wait = smack_task_wait,
|
|
|
+ .task_reparent_to_init = cap_task_reparent_to_init,
|
|
|
+ .task_to_inode = smack_task_to_inode,
|
|
|
+
|
|
|
+ .ipc_permission = smack_ipc_permission,
|
|
|
+
|
|
|
+ .msg_msg_alloc_security = smack_msg_msg_alloc_security,
|
|
|
+ .msg_msg_free_security = smack_msg_msg_free_security,
|
|
|
+
|
|
|
+ .msg_queue_alloc_security = smack_msg_queue_alloc_security,
|
|
|
+ .msg_queue_free_security = smack_msg_queue_free_security,
|
|
|
+ .msg_queue_associate = smack_msg_queue_associate,
|
|
|
+ .msg_queue_msgctl = smack_msg_queue_msgctl,
|
|
|
+ .msg_queue_msgsnd = smack_msg_queue_msgsnd,
|
|
|
+ .msg_queue_msgrcv = smack_msg_queue_msgrcv,
|
|
|
+
|
|
|
+ .shm_alloc_security = smack_shm_alloc_security,
|
|
|
+ .shm_free_security = smack_shm_free_security,
|
|
|
+ .shm_associate = smack_shm_associate,
|
|
|
+ .shm_shmctl = smack_shm_shmctl,
|
|
|
+ .shm_shmat = smack_shm_shmat,
|
|
|
+
|
|
|
+ .sem_alloc_security = smack_sem_alloc_security,
|
|
|
+ .sem_free_security = smack_sem_free_security,
|
|
|
+ .sem_associate = smack_sem_associate,
|
|
|
+ .sem_semctl = smack_sem_semctl,
|
|
|
+ .sem_semop = smack_sem_semop,
|
|
|
+
|
|
|
+ .netlink_send = cap_netlink_send,
|
|
|
+ .netlink_recv = cap_netlink_recv,
|
|
|
+
|
|
|
+ .d_instantiate = smack_d_instantiate,
|
|
|
+
|
|
|
+ .getprocattr = smack_getprocattr,
|
|
|
+ .setprocattr = smack_setprocattr,
|
|
|
+
|
|
|
+ .unix_stream_connect = smack_unix_stream_connect,
|
|
|
+ .unix_may_send = smack_unix_may_send,
|
|
|
+
|
|
|
+ .socket_post_create = smack_socket_post_create,
|
|
|
+ .socket_sock_rcv_skb = smack_socket_sock_rcv_skb,
|
|
|
+ .socket_getpeersec_stream = smack_socket_getpeersec_stream,
|
|
|
+ .socket_getpeersec_dgram = smack_socket_getpeersec_dgram,
|
|
|
+ .sk_alloc_security = smack_sk_alloc_security,
|
|
|
+ .sk_free_security = smack_sk_free_security,
|
|
|
+ .sock_graft = smack_sock_graft,
|
|
|
+ .inet_conn_request = smack_inet_conn_request,
|
|
|
+ /* key management security hooks */
|
|
|
+#ifdef CONFIG_KEYS
|
|
|
+ .key_alloc = smack_key_alloc,
|
|
|
+ .key_free = smack_key_free,
|
|
|
+ .key_permission = smack_key_permission,
|
|
|
+#endif /* CONFIG_KEYS */
|
|
|
+ .secid_to_secctx = smack_secid_to_secctx,
|
|
|
+ .release_secctx = smack_release_secctx,
|
|
|
+};
|
|
|
+
|
|
|
+/**
|
|
|
+ * smack_init - initialize the smack system
|
|
|
+ *
|
|
|
+ * Returns 0
|
|
|
+ */
|
|
|
+static __init int smack_init(void)
|
|
|
+{
|
|
|
+ printk(KERN_INFO "Smack: Initializing.\n");
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Set the security state for the initial task.
|
|
|
+ */
|
|
|
+ current->security = &smack_known_floor.smk_known;
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Initialize locks
|
|
|
+ */
|
|
|
+ spin_lock_init(&smack_known_unset.smk_cipsolock);
|
|
|
+ spin_lock_init(&smack_known_huh.smk_cipsolock);
|
|
|
+ spin_lock_init(&smack_known_hat.smk_cipsolock);
|
|
|
+ spin_lock_init(&smack_known_star.smk_cipsolock);
|
|
|
+ spin_lock_init(&smack_known_floor.smk_cipsolock);
|
|
|
+ spin_lock_init(&smack_known_invalid.smk_cipsolock);
|
|
|
+
|
|
|
+ /*
|
|
|
+ * Register with LSM
|
|
|
+ */
|
|
|
+ if (register_security(&smack_ops))
|
|
|
+ panic("smack: Unable to register with kernel.\n");
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+/*
|
|
|
+ * Smack requires early initialization in order to label
|
|
|
+ * all processes and objects when they are created.
|
|
|
+ */
|
|
|
+security_initcall(smack_init);
|
|
|
+
|
Casey Schaufler