4 files changed, 455 insertions, 0 deletions

diff --git a/security/apparmor/apparmorfs.c b/security/apparmor/apparmorfs.c
new file mode 100644
index 000000000000..7320331b44ab
--- /dev/null
+++ b/security/apparmor/apparmorfs.c
@@ -0,0 +1,239 @@
+/*
+ * AppArmor security module
+ *
+ * This file contains AppArmor /sys/kernel/security/apparmor interface functions
+ *
+ * Copyright (C) 1998-2008 Novell/SUSE
+ * Copyright 2009-2010 Canonical Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, version 2 of the
+ * License.
+ */
+
+#include <linux/security.h>
+#include <linux/vmalloc.h>
+#include <linux/module.h>
+#include <linux/seq_file.h>
+#include <linux/uaccess.h>
+#include <linux/namei.h>
+
+#include "include/apparmor.h"
+#include "include/apparmorfs.h"
+#include "include/audit.h"
+#include "include/context.h"
+#include "include/policy.h"
+
+/**
+ * aa_simple_write_to_buffer - common routine for getting policy from user
+ * @op: operation doing the user buffer copy
+ * @userbuf: user buffer to copy data from  (NOT NULL)
+ * @alloc_size: size of user buffer
+ * @copy_size: size of data to copy from user buffer
+ * @pos: position write is at in the file (NOT NULL)
+ *
+ * Returns: kernel buffer containing copy of user buffer data or an
+ *          ERR_PTR on failure.
+ */
+static char *aa_simple_write_to_buffer(int op, const char __user *userbuf,
+                                       size_t alloc_size, size_t copy_size,
+                                       loff_t *pos)
+{
+        char *data;
+
+        if (*pos != 0)
+                /* only writes from pos 0, that is complete writes */
+                return ERR_PTR(-ESPIPE);
+
+        /*
+         * Don't allow profile load/replace/remove from profiles that don't
+         * have CAP_MAC_ADMIN
+         */
+        if (!aa_may_manage_policy(op))
+                return ERR_PTR(-EACCES);
+
+        /* freed by caller to simple_write_to_buffer */
+        data = kvmalloc(alloc_size);
+        if (data == NULL)
+                return ERR_PTR(-ENOMEM);
+
+        if (copy_from_user(data, userbuf, copy_size)) {
+                kvfree(data);
+                return ERR_PTR(-EFAULT);
+        }
+
+        return data;
+}
+
+
+/* .load file hook fn to load policy */
+static ssize_t profile_load(struct file *f, const char __user *buf, size_t size,
+                            loff_t *pos)
+{
+        char *data;
+        ssize_t error;
+
+        data = aa_simple_write_to_buffer(OP_PROF_LOAD, buf, size, size, pos);
+
+        error = PTR_ERR(data);
+        if (!IS_ERR(data)) {
+                error = aa_replace_profiles(data, size, PROF_ADD);
+                kvfree(data);
+        }
+
+        return error;
+}
+
+static const struct file_operations aa_fs_profile_load = {
+        .write = profile_load
+};
+
+/* .replace file hook fn to load and/or replace policy */
+static ssize_t profile_replace(struct file *f, const char __user *buf,
+                               size_t size, loff_t *pos)
+{
+        char *data;
+        ssize_t error;
+
+        data = aa_simple_write_to_buffer(OP_PROF_REPL, buf, size, size, pos);
+        error = PTR_ERR(data);
+        if (!IS_ERR(data)) {
+                error = aa_replace_profiles(data, size, PROF_REPLACE);
+                kvfree(data);
+        }
+
+        return error;
+}
+
+static const struct file_operations aa_fs_profile_replace = {
+        .write = profile_replace
+};
+
+/* .remove file hook fn to remove loaded policy */
+static ssize_t profile_remove(struct file *f, const char __user *buf,
+                              size_t size, loff_t *pos)
+{
+        char *data;
+        ssize_t error;
+
+        /*
+         * aa_remove_profile needs a null terminated string so 1 extra
+         * byte is allocated and the copied data is null terminated.
+         */
+        data = aa_simple_write_to_buffer(OP_PROF_RM, buf, size + 1, size, pos);
+
+        error = PTR_ERR(data);
+        if (!IS_ERR(data)) {
+                data[size] = 0;
+                error = aa_remove_profiles(data, size);
+                kvfree(data);
+        }
+
+        return error;
+}
+
+static const struct file_operations aa_fs_profile_remove = {
+        .write = profile_remove
+};
+
+/** Base file system setup **/
+
+static struct dentry *aa_fs_dentry __initdata;
+
+static void __init aafs_remove(const char *name)
+{
+        struct dentry *dentry;
+
+        dentry = lookup_one_len(name, aa_fs_dentry, strlen(name));
+        if (!IS_ERR(dentry)) {
+                securityfs_remove(dentry);
+                dput(dentry);
+        }
+}
+
+/**
+ * aafs_create - create an entry in the apparmor filesystem
+ * @name: name of the entry (NOT NULL)
+ * @mask: file permission mask of the file
+ * @fops: file operations for the file (NOT NULL)
+ *
+ * Used aafs_remove to remove entries created with this fn.
+ */
+static int __init aafs_create(const char *name, int mask,
+                              const struct file_operations *fops)
+{
+        struct dentry *dentry;
+
+        dentry = securityfs_create_file(name, S_IFREG | mask, aa_fs_dentry,
+                                        NULL, fops);
+
+        return IS_ERR(dentry) ? PTR_ERR(dentry) : 0;
+}
+
+/**
+ * aa_destroy_aafs - cleanup and free aafs
+ *
+ * releases dentries allocated by aa_create_aafs
+ */
+void __init aa_destroy_aafs(void)
+{
+        if (aa_fs_dentry) {
+                aafs_remove(".remove");
+                aafs_remove(".replace");
+                aafs_remove(".load");
+
+                securityfs_remove(aa_fs_dentry);
+                aa_fs_dentry = NULL;
+        }
+}
+
+/**
+ * aa_create_aafs - create the apparmor security filesystem
+ *
+ * dentries created here are released by aa_destroy_aafs
+ *
+ * Returns: error on failure
+ */
+int __init aa_create_aafs(void)
+{
+        int error;
+
+        if (!apparmor_initialized)
+                return 0;
+
+        if (aa_fs_dentry) {
+                AA_ERROR("%s: AppArmor securityfs already exists\n", __func__);
+                return -EEXIST;
+        }
+
+        aa_fs_dentry = securityfs_create_dir("apparmor", NULL);
+        if (IS_ERR(aa_fs_dentry)) {
+                error = PTR_ERR(aa_fs_dentry);
+                aa_fs_dentry = NULL;
+                goto error;
+        }
+
+        error = aafs_create(".load", 0640, &aa_fs_profile_load);
+        if (error)
+                goto error;
+        error = aafs_create(".replace", 0640, &aa_fs_profile_replace);
+        if (error)
+                goto error;
+        error = aafs_create(".remove", 0640, &aa_fs_profile_remove);
+        if (error)
+                goto error;
+
+        /* TODO: add support for apparmorfs_null and apparmorfs_mnt */
+
+        /* Report that AppArmor fs is enabled */
+        aa_info_message("AppArmor Filesystem Enabled");
+        return 0;
+
+error:
+        aa_destroy_aafs();
+        AA_ERROR("Error creating AppArmor securityfs\n");
+        return error;
+}
+
+fs_initcall(aa_create_aafs);
diff --git a/security/apparmor/include/apparmorfs.h b/security/apparmor/include/apparmorfs.h
new file mode 100644
index 000000000000..cb1e93a114d7
--- /dev/null
+++ b/security/apparmor/include/apparmorfs.h
@@ -0,0 +1,20 @@
+/*
+ * AppArmor security module
+ *
+ * This file contains AppArmor filesystem definitions.
+ *
+ * Copyright (C) 1998-2008 Novell/SUSE
+ * Copyright 2009-2010 Canonical Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, version 2 of the
+ * License.
+ */
+
+#ifndef __AA_APPARMORFS_H
+#define __AA_APPARMORFS_H
+
+extern void __init aa_destroy_aafs(void);
+
+#endif /* __AA_APPARMORFS_H */
diff --git a/security/apparmor/include/procattr.h b/security/apparmor/include/procattr.h
new file mode 100644
index 000000000000..544aa6b766a4
--- /dev/null
+++ b/security/apparmor/include/procattr.h
@@ -0,0 +1,26 @@
+/*
+ * AppArmor security module
+ *
+ * This file contains AppArmor /proc/<pid>/attr/ interface function definitions.
+ *
+ * Copyright (C) 1998-2008 Novell/SUSE
+ * Copyright 2009-2010 Canonical Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, version 2 of the
+ * License.
+ */
+
+#ifndef __AA_PROCATTR_H
+#define __AA_PROCATTR_H
+
+#define AA_DO_TEST 1
+#define AA_ONEXEC  1
+
+int aa_getprocattr(struct aa_profile *profile, char **string);
+int aa_setprocattr_changehat(char *args, size_t size, int test);
+int aa_setprocattr_changeprofile(char *fqname, bool onexec, int test);
+int aa_setprocattr_permipc(char *fqname);
+
+#endif /* __AA_PROCATTR_H */
diff --git a/security/apparmor/procattr.c b/security/apparmor/procattr.c
new file mode 100644
index 000000000000..04a2cf8d1b65
--- /dev/null
+++ b/security/apparmor/procattr.c
@@ -0,0 +1,170 @@
+/*
+ * AppArmor security module
+ *
+ * This file contains AppArmor /proc/<pid>/attr/ interface functions
+ *
+ * Copyright (C) 1998-2008 Novell/SUSE
+ * Copyright 2009-2010 Canonical Ltd.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, version 2 of the
+ * License.
+ */
+
+#include "include/apparmor.h"
+#include "include/context.h"
+#include "include/policy.h"
+#include "include/domain.h"
+
+
+/**
+ * aa_getprocattr - Return the profile information for @profile
+ * @profile: the profile to print profile info about  (NOT NULL)
+ * @string: Returns - string containing the profile info (NOT NULL)
+ *
+ * Returns: length of @string on success else error on failure
+ *
+ * Requires: profile != NULL
+ *
+ * Creates a string containing the namespace_name://profile_name for
+ * @profile.
+ *
+ * Returns: size of string placed in @string else error code on failure
+ */
+int aa_getprocattr(struct aa_profile *profile, char **string)
+{
+        char *str;
+        int len = 0, mode_len = 0, ns_len = 0, name_len;
+        const char *mode_str = profile_mode_names[profile->mode];
+        const char *ns_name = NULL;
+        struct aa_namespace *ns = profile->ns;
+        struct aa_namespace *current_ns = __aa_current_profile()->ns;
+        char *s;
+
+        if (!aa_ns_visible(current_ns, ns))
+                return -EACCES;
+
+        ns_name = aa_ns_name(current_ns, ns);
+        ns_len = strlen(ns_name);
+
+        /* if the visible ns_name is > 0 increase size for : :// seperator */
+        if (ns_len)
+                ns_len += 4;
+
+        /* unconfined profiles don't have a mode string appended */
+        if (!unconfined(profile))
+                mode_len = strlen(mode_str) + 3;        /* + 3 for _() */
+
+        name_len = strlen(profile->base.hname);
+        len = mode_len + ns_len + name_len + 1;     /* + 1 for \n */
+        s = str = kmalloc(len + 1, GFP_KERNEL);     /* + 1 \0 */
+        if (!str)
+                return -ENOMEM;
+
+        if (ns_len) {
+                /* skip over prefix current_ns->base.hname and separating // */
+                sprintf(s, ":%s://", ns_name);
+                s += ns_len;
+        }
+        if (unconfined(profile))
+                /* mode string not being appended */
+                sprintf(s, "%s\n", profile->base.hname);
+        else
+                sprintf(s, "%s (%s)\n", profile->base.hname, mode_str);
+        *string = str;
+
+        /* NOTE: len does not include \0 of string, not saved as part of file */
+        return len;
+}
+
+/**
+ * split_token_from_name - separate a string of form  <token>^<name>
+ * @op: operation being checked
+ * @args: string to parse  (NOT NULL)
+ * @token: stores returned parsed token value  (NOT NULL)
+ *
+ * Returns: start position of name after token else NULL on failure
+ */
+static char *split_token_from_name(int op, char *args, u64 * token)
+{
+        char *name;
+
+        *token = simple_strtoull(args, &name, 16);
+        if ((name == args) || *name != '^') {
+                AA_ERROR("%s: Invalid input '%s'", op_table[op], args);
+                return ERR_PTR(-EINVAL);
+        }
+
+        name++;                 /* skip ^ */
+        if (!*name)
+                name = NULL;
+        return name;
+}
+
+/**
+ * aa_setprocattr_chagnehat - handle procattr interface to change_hat
+ * @args: args received from writing to /proc/<pid>/attr/current (NOT NULL)
+ * @size: size of the args
+ * @test: true if this is a test of change_hat permissions
+ *
+ * Returns: %0 or error code if change_hat fails
+ */
+int aa_setprocattr_changehat(char *args, size_t size, int test)
+{
+        char *hat;
+        u64 token;
+        const char *hats[16];           /* current hard limit on # of names */
+        int count = 0;
+
+        hat = split_token_from_name(OP_CHANGE_HAT, args, &token);
+        if (IS_ERR(hat))
+                return PTR_ERR(hat);
+
+        if (!hat && !token) {
+                AA_ERROR("change_hat: Invalid input, NULL hat and NULL magic");
+                return -EINVAL;
+        }
+
+        if (hat) {
+                /* set up hat name vector, args guaranteed null terminated
+                 * at args[size] by setprocattr.
+                 *
+                 * If there are multiple hat names in the buffer each is
+                 * separated by a \0.  Ie. userspace writes them pre tokenized
+                 */
+                char *end = args + size;
+                for (count = 0; (hat < end) && count < 16; ++count) {
+                        char *next = hat + strlen(hat) + 1;
+                        hats[count] = hat;
+                        hat = next;
+                }
+        }
+
+        AA_DEBUG("%s: Magic 0x%llx Hat '%s'\n",
+                 __func__, token, hat ? hat : NULL);
+
+        return aa_change_hat(hats, count, token, test);
+}
+
+/**
+ * aa_setprocattr_changeprofile - handle procattr interface to changeprofile
+ * @fqname: args received from writting to /proc/<pid>/attr/current (NOT NULL)
+ * @onexec: true if change_profile should be delayed until exec
+ * @test: true if this is a test of change_profile permissions
+ *
+ * Returns: %0 or error code if change_profile fails
+ */
+int aa_setprocattr_changeprofile(char *fqname, bool onexec, int test)
+{
+        char *name, *ns_name;
+
+        name = aa_split_fqname(fqname, &ns_name);
+        return aa_change_profile(ns_name, name, onexec, test);
+}
+
+int aa_setprocattr_permipc(char *fqname)
+{
+        /* TODO: add ipc permission querying */
+        return -ENOTSUPP;
+}