![Matthew Garrett](/assets/img/avatar_default.png)
Add support for parsing secmark policy provided by userspace, and store that in the overall policy. Signed-off-by: Matthew Garrett <mjg59@google.com> Signed-off-by: John Johansen <john.johansen@canonical.com>
1095 lines
26 KiB
C
1095 lines
26 KiB
C
/*
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* AppArmor security module
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*
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* This file contains AppArmor functions for unpacking policy loaded from
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* userspace.
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*
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* Copyright (C) 1998-2008 Novell/SUSE
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* Copyright 2009-2010 Canonical Ltd.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2 of the
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* License.
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*
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* AppArmor uses a serialized binary format for loading policy. To find
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* policy format documentation see Documentation/admin-guide/LSM/apparmor.rst
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* All policy is validated before it is used.
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*/
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#include <asm/unaligned.h>
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#include <linux/ctype.h>
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#include <linux/errno.h>
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#include "include/apparmor.h"
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#include "include/audit.h"
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#include "include/cred.h"
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#include "include/crypto.h"
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#include "include/match.h"
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#include "include/path.h"
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#include "include/policy.h"
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#include "include/policy_unpack.h"
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#define K_ABI_MASK 0x3ff
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#define FORCE_COMPLAIN_FLAG 0x800
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#define VERSION_LT(X, Y) (((X) & K_ABI_MASK) < ((Y) & K_ABI_MASK))
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#define VERSION_GT(X, Y) (((X) & K_ABI_MASK) > ((Y) & K_ABI_MASK))
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#define v5 5 /* base version */
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#define v6 6 /* per entry policydb mediation check */
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#define v7 7
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#define v8 8 /* full network masking */
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/*
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* The AppArmor interface treats data as a type byte followed by the
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* actual data. The interface has the notion of a a named entry
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* which has a name (AA_NAME typecode followed by name string) followed by
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* the entries typecode and data. Named types allow for optional
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* elements and extensions to be added and tested for without breaking
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* backwards compatibility.
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*/
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enum aa_code {
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AA_U8,
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AA_U16,
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AA_U32,
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AA_U64,
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AA_NAME, /* same as string except it is items name */
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AA_STRING,
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AA_BLOB,
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AA_STRUCT,
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AA_STRUCTEND,
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AA_LIST,
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AA_LISTEND,
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AA_ARRAY,
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AA_ARRAYEND,
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};
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/*
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* aa_ext is the read of the buffer containing the serialized profile. The
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* data is copied into a kernel buffer in apparmorfs and then handed off to
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* the unpack routines.
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*/
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struct aa_ext {
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void *start;
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void *end;
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void *pos; /* pointer to current position in the buffer */
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u32 version;
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};
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/* audit callback for unpack fields */
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static void audit_cb(struct audit_buffer *ab, void *va)
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{
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struct common_audit_data *sa = va;
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if (aad(sa)->iface.ns) {
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audit_log_format(ab, " ns=");
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audit_log_untrustedstring(ab, aad(sa)->iface.ns);
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}
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if (aad(sa)->name) {
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audit_log_format(ab, " name=");
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audit_log_untrustedstring(ab, aad(sa)->name);
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}
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if (aad(sa)->iface.pos)
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audit_log_format(ab, " offset=%ld", aad(sa)->iface.pos);
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}
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/**
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* audit_iface - do audit message for policy unpacking/load/replace/remove
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* @new: profile if it has been allocated (MAYBE NULL)
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* @ns_name: name of the ns the profile is to be loaded to (MAY BE NULL)
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* @name: name of the profile being manipulated (MAYBE NULL)
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* @info: any extra info about the failure (MAYBE NULL)
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* @e: buffer position info
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* @error: error code
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*
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* Returns: %0 or error
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*/
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static int audit_iface(struct aa_profile *new, const char *ns_name,
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const char *name, const char *info, struct aa_ext *e,
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int error)
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{
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struct aa_profile *profile = labels_profile(aa_current_raw_label());
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DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_NONE, NULL);
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if (e)
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aad(&sa)->iface.pos = e->pos - e->start;
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aad(&sa)->iface.ns = ns_name;
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if (new)
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aad(&sa)->name = new->base.hname;
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else
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aad(&sa)->name = name;
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aad(&sa)->info = info;
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aad(&sa)->error = error;
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return aa_audit(AUDIT_APPARMOR_STATUS, profile, &sa, audit_cb);
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}
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void __aa_loaddata_update(struct aa_loaddata *data, long revision)
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{
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AA_BUG(!data);
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AA_BUG(!data->ns);
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AA_BUG(!data->dents[AAFS_LOADDATA_REVISION]);
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AA_BUG(!mutex_is_locked(&data->ns->lock));
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AA_BUG(data->revision > revision);
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data->revision = revision;
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d_inode(data->dents[AAFS_LOADDATA_DIR])->i_mtime =
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current_time(d_inode(data->dents[AAFS_LOADDATA_DIR]));
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d_inode(data->dents[AAFS_LOADDATA_REVISION])->i_mtime =
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current_time(d_inode(data->dents[AAFS_LOADDATA_REVISION]));
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}
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bool aa_rawdata_eq(struct aa_loaddata *l, struct aa_loaddata *r)
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{
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if (l->size != r->size)
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return false;
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if (aa_g_hash_policy && memcmp(l->hash, r->hash, aa_hash_size()) != 0)
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return false;
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return memcmp(l->data, r->data, r->size) == 0;
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}
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/*
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* need to take the ns mutex lock which is NOT safe most places that
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* put_loaddata is called, so we have to delay freeing it
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*/
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static void do_loaddata_free(struct work_struct *work)
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{
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struct aa_loaddata *d = container_of(work, struct aa_loaddata, work);
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struct aa_ns *ns = aa_get_ns(d->ns);
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if (ns) {
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mutex_lock_nested(&ns->lock, ns->level);
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__aa_fs_remove_rawdata(d);
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mutex_unlock(&ns->lock);
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aa_put_ns(ns);
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}
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kzfree(d->hash);
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kzfree(d->name);
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kvfree(d->data);
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kzfree(d);
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}
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void aa_loaddata_kref(struct kref *kref)
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{
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struct aa_loaddata *d = container_of(kref, struct aa_loaddata, count);
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if (d) {
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INIT_WORK(&d->work, do_loaddata_free);
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schedule_work(&d->work);
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}
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}
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struct aa_loaddata *aa_loaddata_alloc(size_t size)
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{
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struct aa_loaddata *d;
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d = kzalloc(sizeof(*d), GFP_KERNEL);
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if (d == NULL)
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return ERR_PTR(-ENOMEM);
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d->data = kvzalloc(size, GFP_KERNEL);
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if (!d->data) {
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kfree(d);
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return ERR_PTR(-ENOMEM);
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}
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kref_init(&d->count);
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INIT_LIST_HEAD(&d->list);
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return d;
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}
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/* test if read will be in packed data bounds */
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static bool inbounds(struct aa_ext *e, size_t size)
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{
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return (size <= e->end - e->pos);
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}
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static void *kvmemdup(const void *src, size_t len)
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{
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void *p = kvmalloc(len, GFP_KERNEL);
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if (p)
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memcpy(p, src, len);
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return p;
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}
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/**
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* aa_u16_chunck - test and do bounds checking for a u16 size based chunk
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* @e: serialized data read head (NOT NULL)
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* @chunk: start address for chunk of data (NOT NULL)
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*
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* Returns: the size of chunk found with the read head at the end of the chunk.
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*/
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static size_t unpack_u16_chunk(struct aa_ext *e, char **chunk)
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{
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size_t size = 0;
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if (!inbounds(e, sizeof(u16)))
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return 0;
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size = le16_to_cpu(get_unaligned((__le16 *) e->pos));
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e->pos += sizeof(__le16);
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if (!inbounds(e, size))
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return 0;
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*chunk = e->pos;
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e->pos += size;
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return size;
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}
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/* unpack control byte */
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static bool unpack_X(struct aa_ext *e, enum aa_code code)
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{
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if (!inbounds(e, 1))
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return 0;
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if (*(u8 *) e->pos != code)
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return 0;
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e->pos++;
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return 1;
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}
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/**
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* unpack_nameX - check is the next element is of type X with a name of @name
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* @e: serialized data extent information (NOT NULL)
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* @code: type code
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* @name: name to match to the serialized element. (MAYBE NULL)
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*
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* check that the next serialized data element is of type X and has a tag
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* name @name. If @name is specified then there must be a matching
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* name element in the stream. If @name is NULL any name element will be
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* skipped and only the typecode will be tested.
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*
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* Returns 1 on success (both type code and name tests match) and the read
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* head is advanced past the headers
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*
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* Returns: 0 if either match fails, the read head does not move
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*/
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static bool unpack_nameX(struct aa_ext *e, enum aa_code code, const char *name)
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{
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/*
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* May need to reset pos if name or type doesn't match
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*/
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void *pos = e->pos;
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/*
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* Check for presence of a tagname, and if present name size
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* AA_NAME tag value is a u16.
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*/
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if (unpack_X(e, AA_NAME)) {
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char *tag = NULL;
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size_t size = unpack_u16_chunk(e, &tag);
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/* if a name is specified it must match. otherwise skip tag */
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if (name && (!size || strcmp(name, tag)))
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goto fail;
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} else if (name) {
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/* if a name is specified and there is no name tag fail */
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goto fail;
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}
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/* now check if type code matches */
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if (unpack_X(e, code))
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return 1;
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fail:
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e->pos = pos;
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return 0;
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}
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static bool unpack_u8(struct aa_ext *e, u8 *data, const char *name)
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{
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if (unpack_nameX(e, AA_U8, name)) {
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if (!inbounds(e, sizeof(u8)))
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return 0;
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if (data)
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*data = get_unaligned((u8 *)e->pos);
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e->pos += sizeof(u8);
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return 1;
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}
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return 0;
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}
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static bool unpack_u32(struct aa_ext *e, u32 *data, const char *name)
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{
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if (unpack_nameX(e, AA_U32, name)) {
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if (!inbounds(e, sizeof(u32)))
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return 0;
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if (data)
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*data = le32_to_cpu(get_unaligned((__le32 *) e->pos));
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e->pos += sizeof(u32);
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return 1;
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}
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return 0;
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}
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static bool unpack_u64(struct aa_ext *e, u64 *data, const char *name)
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{
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if (unpack_nameX(e, AA_U64, name)) {
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if (!inbounds(e, sizeof(u64)))
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return 0;
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if (data)
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*data = le64_to_cpu(get_unaligned((__le64 *) e->pos));
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e->pos += sizeof(u64);
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return 1;
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}
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return 0;
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}
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static size_t unpack_array(struct aa_ext *e, const char *name)
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{
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if (unpack_nameX(e, AA_ARRAY, name)) {
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int size;
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if (!inbounds(e, sizeof(u16)))
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return 0;
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size = (int)le16_to_cpu(get_unaligned((__le16 *) e->pos));
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e->pos += sizeof(u16);
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return size;
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}
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return 0;
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}
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static size_t unpack_blob(struct aa_ext *e, char **blob, const char *name)
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{
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if (unpack_nameX(e, AA_BLOB, name)) {
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u32 size;
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if (!inbounds(e, sizeof(u32)))
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return 0;
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size = le32_to_cpu(get_unaligned((__le32 *) e->pos));
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e->pos += sizeof(u32);
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if (inbounds(e, (size_t) size)) {
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*blob = e->pos;
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e->pos += size;
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return size;
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}
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}
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return 0;
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}
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static int unpack_str(struct aa_ext *e, const char **string, const char *name)
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{
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char *src_str;
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size_t size = 0;
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void *pos = e->pos;
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*string = NULL;
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if (unpack_nameX(e, AA_STRING, name)) {
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size = unpack_u16_chunk(e, &src_str);
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if (size) {
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/* strings are null terminated, length is size - 1 */
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if (src_str[size - 1] != 0)
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goto fail;
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*string = src_str;
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}
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}
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return size;
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fail:
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e->pos = pos;
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return 0;
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}
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|
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static int unpack_strdup(struct aa_ext *e, char **string, const char *name)
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{
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const char *tmp;
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void *pos = e->pos;
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int res = unpack_str(e, &tmp, name);
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*string = NULL;
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if (!res)
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return 0;
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|
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*string = kmemdup(tmp, res, GFP_KERNEL);
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if (!*string) {
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e->pos = pos;
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return 0;
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}
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|
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return res;
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}
|
|
|
|
|
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/**
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* unpack_dfa - unpack a file rule dfa
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* @e: serialized data extent information (NOT NULL)
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*
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* returns dfa or ERR_PTR or NULL if no dfa
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|
*/
|
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static struct aa_dfa *unpack_dfa(struct aa_ext *e)
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{
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char *blob = NULL;
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size_t size;
|
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struct aa_dfa *dfa = NULL;
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|
|
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size = unpack_blob(e, &blob, "aadfa");
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if (size) {
|
|
/*
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|
* The dfa is aligned with in the blob to 8 bytes
|
|
* from the beginning of the stream.
|
|
* alignment adjust needed by dfa unpack
|
|
*/
|
|
size_t sz = blob - (char *) e->start -
|
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((e->pos - e->start) & 7);
|
|
size_t pad = ALIGN(sz, 8) - sz;
|
|
int flags = TO_ACCEPT1_FLAG(YYTD_DATA32) |
|
|
TO_ACCEPT2_FLAG(YYTD_DATA32) | DFA_FLAG_VERIFY_STATES;
|
|
dfa = aa_dfa_unpack(blob + pad, size - pad, flags);
|
|
|
|
if (IS_ERR(dfa))
|
|
return dfa;
|
|
|
|
}
|
|
|
|
return dfa;
|
|
}
|
|
|
|
/**
|
|
* unpack_trans_table - unpack a profile transition table
|
|
* @e: serialized data extent information (NOT NULL)
|
|
* @profile: profile to add the accept table to (NOT NULL)
|
|
*
|
|
* Returns: 1 if table successfully unpacked
|
|
*/
|
|
static bool unpack_trans_table(struct aa_ext *e, struct aa_profile *profile)
|
|
{
|
|
void *saved_pos = e->pos;
|
|
|
|
/* exec table is optional */
|
|
if (unpack_nameX(e, AA_STRUCT, "xtable")) {
|
|
int i, size;
|
|
|
|
size = unpack_array(e, NULL);
|
|
/* currently 4 exec bits and entries 0-3 are reserved iupcx */
|
|
if (size > 16 - 4)
|
|
goto fail;
|
|
profile->file.trans.table = kcalloc(size, sizeof(char *),
|
|
GFP_KERNEL);
|
|
if (!profile->file.trans.table)
|
|
goto fail;
|
|
|
|
profile->file.trans.size = size;
|
|
for (i = 0; i < size; i++) {
|
|
char *str;
|
|
int c, j, pos, size2 = unpack_strdup(e, &str, NULL);
|
|
/* unpack_strdup verifies that the last character is
|
|
* null termination byte.
|
|
*/
|
|
if (!size2)
|
|
goto fail;
|
|
profile->file.trans.table[i] = str;
|
|
/* verify that name doesn't start with space */
|
|
if (isspace(*str))
|
|
goto fail;
|
|
|
|
/* count internal # of internal \0 */
|
|
for (c = j = 0; j < size2 - 1; j++) {
|
|
if (!str[j]) {
|
|
pos = j;
|
|
c++;
|
|
}
|
|
}
|
|
if (*str == ':') {
|
|
/* first character after : must be valid */
|
|
if (!str[1])
|
|
goto fail;
|
|
/* beginning with : requires an embedded \0,
|
|
* verify that exactly 1 internal \0 exists
|
|
* trailing \0 already verified by unpack_strdup
|
|
*
|
|
* convert \0 back to : for label_parse
|
|
*/
|
|
if (c == 1)
|
|
str[pos] = ':';
|
|
else if (c > 1)
|
|
goto fail;
|
|
} else if (c)
|
|
/* fail - all other cases with embedded \0 */
|
|
goto fail;
|
|
}
|
|
if (!unpack_nameX(e, AA_ARRAYEND, NULL))
|
|
goto fail;
|
|
if (!unpack_nameX(e, AA_STRUCTEND, NULL))
|
|
goto fail;
|
|
}
|
|
return 1;
|
|
|
|
fail:
|
|
aa_free_domain_entries(&profile->file.trans);
|
|
e->pos = saved_pos;
|
|
return 0;
|
|
}
|
|
|
|
static bool unpack_xattrs(struct aa_ext *e, struct aa_profile *profile)
|
|
{
|
|
void *pos = e->pos;
|
|
|
|
if (unpack_nameX(e, AA_STRUCT, "xattrs")) {
|
|
int i, size;
|
|
|
|
size = unpack_array(e, NULL);
|
|
profile->xattr_count = size;
|
|
profile->xattrs = kcalloc(size, sizeof(char *), GFP_KERNEL);
|
|
if (!profile->xattrs)
|
|
goto fail;
|
|
for (i = 0; i < size; i++) {
|
|
if (!unpack_strdup(e, &profile->xattrs[i], NULL))
|
|
goto fail;
|
|
}
|
|
if (!unpack_nameX(e, AA_ARRAYEND, NULL))
|
|
goto fail;
|
|
if (!unpack_nameX(e, AA_STRUCTEND, NULL))
|
|
goto fail;
|
|
}
|
|
|
|
return 1;
|
|
|
|
fail:
|
|
e->pos = pos;
|
|
return 0;
|
|
}
|
|
|
|
static bool unpack_secmark(struct aa_ext *e, struct aa_profile *profile)
|
|
{
|
|
void *pos = e->pos;
|
|
int i, size;
|
|
|
|
if (unpack_nameX(e, AA_STRUCT, "secmark")) {
|
|
size = unpack_array(e, NULL);
|
|
|
|
profile->secmark = kcalloc(size, sizeof(struct aa_secmark),
|
|
GFP_KERNEL);
|
|
if (!profile->secmark)
|
|
goto fail;
|
|
|
|
profile->secmark_count = size;
|
|
|
|
for (i = 0; i < size; i++) {
|
|
if (!unpack_u8(e, &profile->secmark[i].audit, NULL))
|
|
goto fail;
|
|
if (!unpack_u8(e, &profile->secmark[i].deny, NULL))
|
|
goto fail;
|
|
if (!unpack_strdup(e, &profile->secmark[i].label, NULL))
|
|
goto fail;
|
|
}
|
|
if (!unpack_nameX(e, AA_ARRAYEND, NULL))
|
|
goto fail;
|
|
if (!unpack_nameX(e, AA_STRUCTEND, NULL))
|
|
goto fail;
|
|
}
|
|
|
|
return 1;
|
|
|
|
fail:
|
|
if (profile->secmark) {
|
|
for (i = 0; i < size; i++)
|
|
kfree(profile->secmark[i].label);
|
|
kfree(profile->secmark);
|
|
profile->secmark_count = 0;
|
|
}
|
|
|
|
e->pos = pos;
|
|
return 0;
|
|
}
|
|
|
|
static bool unpack_rlimits(struct aa_ext *e, struct aa_profile *profile)
|
|
{
|
|
void *pos = e->pos;
|
|
|
|
/* rlimits are optional */
|
|
if (unpack_nameX(e, AA_STRUCT, "rlimits")) {
|
|
int i, size;
|
|
u32 tmp = 0;
|
|
if (!unpack_u32(e, &tmp, NULL))
|
|
goto fail;
|
|
profile->rlimits.mask = tmp;
|
|
|
|
size = unpack_array(e, NULL);
|
|
if (size > RLIM_NLIMITS)
|
|
goto fail;
|
|
for (i = 0; i < size; i++) {
|
|
u64 tmp2 = 0;
|
|
int a = aa_map_resource(i);
|
|
if (!unpack_u64(e, &tmp2, NULL))
|
|
goto fail;
|
|
profile->rlimits.limits[a].rlim_max = tmp2;
|
|
}
|
|
if (!unpack_nameX(e, AA_ARRAYEND, NULL))
|
|
goto fail;
|
|
if (!unpack_nameX(e, AA_STRUCTEND, NULL))
|
|
goto fail;
|
|
}
|
|
return 1;
|
|
|
|
fail:
|
|
e->pos = pos;
|
|
return 0;
|
|
}
|
|
|
|
static u32 strhash(const void *data, u32 len, u32 seed)
|
|
{
|
|
const char * const *key = data;
|
|
|
|
return jhash(*key, strlen(*key), seed);
|
|
}
|
|
|
|
static int datacmp(struct rhashtable_compare_arg *arg, const void *obj)
|
|
{
|
|
const struct aa_data *data = obj;
|
|
const char * const *key = arg->key;
|
|
|
|
return strcmp(data->key, *key);
|
|
}
|
|
|
|
/**
|
|
* unpack_profile - unpack a serialized profile
|
|
* @e: serialized data extent information (NOT NULL)
|
|
*
|
|
* NOTE: unpack profile sets audit struct if there is a failure
|
|
*/
|
|
static struct aa_profile *unpack_profile(struct aa_ext *e, char **ns_name)
|
|
{
|
|
struct aa_profile *profile = NULL;
|
|
const char *tmpname, *tmpns = NULL, *name = NULL;
|
|
const char *info = "failed to unpack profile";
|
|
size_t ns_len;
|
|
struct rhashtable_params params = { 0 };
|
|
char *key = NULL;
|
|
struct aa_data *data;
|
|
int i, error = -EPROTO;
|
|
kernel_cap_t tmpcap;
|
|
u32 tmp;
|
|
|
|
*ns_name = NULL;
|
|
|
|
/* check that we have the right struct being passed */
|
|
if (!unpack_nameX(e, AA_STRUCT, "profile"))
|
|
goto fail;
|
|
if (!unpack_str(e, &name, NULL))
|
|
goto fail;
|
|
if (*name == '\0')
|
|
goto fail;
|
|
|
|
tmpname = aa_splitn_fqname(name, strlen(name), &tmpns, &ns_len);
|
|
if (tmpns) {
|
|
*ns_name = kstrndup(tmpns, ns_len, GFP_KERNEL);
|
|
if (!*ns_name) {
|
|
info = "out of memory";
|
|
goto fail;
|
|
}
|
|
name = tmpname;
|
|
}
|
|
|
|
profile = aa_alloc_profile(name, NULL, GFP_KERNEL);
|
|
if (!profile)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
/* profile renaming is optional */
|
|
(void) unpack_str(e, &profile->rename, "rename");
|
|
|
|
/* attachment string is optional */
|
|
(void) unpack_str(e, &profile->attach, "attach");
|
|
|
|
/* xmatch is optional and may be NULL */
|
|
profile->xmatch = unpack_dfa(e);
|
|
if (IS_ERR(profile->xmatch)) {
|
|
error = PTR_ERR(profile->xmatch);
|
|
profile->xmatch = NULL;
|
|
info = "bad xmatch";
|
|
goto fail;
|
|
}
|
|
/* xmatch_len is not optional if xmatch is set */
|
|
if (profile->xmatch) {
|
|
if (!unpack_u32(e, &tmp, NULL)) {
|
|
info = "missing xmatch len";
|
|
goto fail;
|
|
}
|
|
profile->xmatch_len = tmp;
|
|
}
|
|
|
|
/* disconnected attachment string is optional */
|
|
(void) unpack_str(e, &profile->disconnected, "disconnected");
|
|
|
|
/* per profile debug flags (complain, audit) */
|
|
if (!unpack_nameX(e, AA_STRUCT, "flags")) {
|
|
info = "profile missing flags";
|
|
goto fail;
|
|
}
|
|
info = "failed to unpack profile flags";
|
|
if (!unpack_u32(e, &tmp, NULL))
|
|
goto fail;
|
|
if (tmp & PACKED_FLAG_HAT)
|
|
profile->label.flags |= FLAG_HAT;
|
|
if (!unpack_u32(e, &tmp, NULL))
|
|
goto fail;
|
|
if (tmp == PACKED_MODE_COMPLAIN || (e->version & FORCE_COMPLAIN_FLAG))
|
|
profile->mode = APPARMOR_COMPLAIN;
|
|
else if (tmp == PACKED_MODE_KILL)
|
|
profile->mode = APPARMOR_KILL;
|
|
else if (tmp == PACKED_MODE_UNCONFINED)
|
|
profile->mode = APPARMOR_UNCONFINED;
|
|
if (!unpack_u32(e, &tmp, NULL))
|
|
goto fail;
|
|
if (tmp)
|
|
profile->audit = AUDIT_ALL;
|
|
|
|
if (!unpack_nameX(e, AA_STRUCTEND, NULL))
|
|
goto fail;
|
|
|
|
/* path_flags is optional */
|
|
if (unpack_u32(e, &profile->path_flags, "path_flags"))
|
|
profile->path_flags |= profile->label.flags &
|
|
PATH_MEDIATE_DELETED;
|
|
else
|
|
/* set a default value if path_flags field is not present */
|
|
profile->path_flags = PATH_MEDIATE_DELETED;
|
|
|
|
info = "failed to unpack profile capabilities";
|
|
if (!unpack_u32(e, &(profile->caps.allow.cap[0]), NULL))
|
|
goto fail;
|
|
if (!unpack_u32(e, &(profile->caps.audit.cap[0]), NULL))
|
|
goto fail;
|
|
if (!unpack_u32(e, &(profile->caps.quiet.cap[0]), NULL))
|
|
goto fail;
|
|
if (!unpack_u32(e, &tmpcap.cap[0], NULL))
|
|
goto fail;
|
|
|
|
info = "failed to unpack upper profile capabilities";
|
|
if (unpack_nameX(e, AA_STRUCT, "caps64")) {
|
|
/* optional upper half of 64 bit caps */
|
|
if (!unpack_u32(e, &(profile->caps.allow.cap[1]), NULL))
|
|
goto fail;
|
|
if (!unpack_u32(e, &(profile->caps.audit.cap[1]), NULL))
|
|
goto fail;
|
|
if (!unpack_u32(e, &(profile->caps.quiet.cap[1]), NULL))
|
|
goto fail;
|
|
if (!unpack_u32(e, &(tmpcap.cap[1]), NULL))
|
|
goto fail;
|
|
if (!unpack_nameX(e, AA_STRUCTEND, NULL))
|
|
goto fail;
|
|
}
|
|
|
|
info = "failed to unpack extended profile capabilities";
|
|
if (unpack_nameX(e, AA_STRUCT, "capsx")) {
|
|
/* optional extended caps mediation mask */
|
|
if (!unpack_u32(e, &(profile->caps.extended.cap[0]), NULL))
|
|
goto fail;
|
|
if (!unpack_u32(e, &(profile->caps.extended.cap[1]), NULL))
|
|
goto fail;
|
|
if (!unpack_nameX(e, AA_STRUCTEND, NULL))
|
|
goto fail;
|
|
}
|
|
|
|
if (!unpack_xattrs(e, profile)) {
|
|
info = "failed to unpack profile xattrs";
|
|
goto fail;
|
|
}
|
|
|
|
if (!unpack_rlimits(e, profile)) {
|
|
info = "failed to unpack profile rlimits";
|
|
goto fail;
|
|
}
|
|
|
|
if (!unpack_secmark(e, profile)) {
|
|
info = "failed to unpack profile secmark rules";
|
|
goto fail;
|
|
}
|
|
|
|
if (unpack_nameX(e, AA_STRUCT, "policydb")) {
|
|
/* generic policy dfa - optional and may be NULL */
|
|
info = "failed to unpack policydb";
|
|
profile->policy.dfa = unpack_dfa(e);
|
|
if (IS_ERR(profile->policy.dfa)) {
|
|
error = PTR_ERR(profile->policy.dfa);
|
|
profile->policy.dfa = NULL;
|
|
goto fail;
|
|
} else if (!profile->policy.dfa) {
|
|
error = -EPROTO;
|
|
goto fail;
|
|
}
|
|
if (!unpack_u32(e, &profile->policy.start[0], "start"))
|
|
/* default start state */
|
|
profile->policy.start[0] = DFA_START;
|
|
/* setup class index */
|
|
for (i = AA_CLASS_FILE; i <= AA_CLASS_LAST; i++) {
|
|
profile->policy.start[i] =
|
|
aa_dfa_next(profile->policy.dfa,
|
|
profile->policy.start[0],
|
|
i);
|
|
}
|
|
if (!unpack_nameX(e, AA_STRUCTEND, NULL))
|
|
goto fail;
|
|
} else
|
|
profile->policy.dfa = aa_get_dfa(nulldfa);
|
|
|
|
/* get file rules */
|
|
profile->file.dfa = unpack_dfa(e);
|
|
if (IS_ERR(profile->file.dfa)) {
|
|
error = PTR_ERR(profile->file.dfa);
|
|
profile->file.dfa = NULL;
|
|
info = "failed to unpack profile file rules";
|
|
goto fail;
|
|
} else if (profile->file.dfa) {
|
|
if (!unpack_u32(e, &profile->file.start, "dfa_start"))
|
|
/* default start state */
|
|
profile->file.start = DFA_START;
|
|
} else if (profile->policy.dfa &&
|
|
profile->policy.start[AA_CLASS_FILE]) {
|
|
profile->file.dfa = aa_get_dfa(profile->policy.dfa);
|
|
profile->file.start = profile->policy.start[AA_CLASS_FILE];
|
|
} else
|
|
profile->file.dfa = aa_get_dfa(nulldfa);
|
|
|
|
if (!unpack_trans_table(e, profile)) {
|
|
info = "failed to unpack profile transition table";
|
|
goto fail;
|
|
}
|
|
|
|
if (unpack_nameX(e, AA_STRUCT, "data")) {
|
|
info = "out of memory";
|
|
profile->data = kzalloc(sizeof(*profile->data), GFP_KERNEL);
|
|
if (!profile->data)
|
|
goto fail;
|
|
|
|
params.nelem_hint = 3;
|
|
params.key_len = sizeof(void *);
|
|
params.key_offset = offsetof(struct aa_data, key);
|
|
params.head_offset = offsetof(struct aa_data, head);
|
|
params.hashfn = strhash;
|
|
params.obj_cmpfn = datacmp;
|
|
|
|
if (rhashtable_init(profile->data, ¶ms)) {
|
|
info = "failed to init key, value hash table";
|
|
goto fail;
|
|
}
|
|
|
|
while (unpack_strdup(e, &key, NULL)) {
|
|
data = kzalloc(sizeof(*data), GFP_KERNEL);
|
|
if (!data) {
|
|
kzfree(key);
|
|
goto fail;
|
|
}
|
|
|
|
data->key = key;
|
|
data->size = unpack_blob(e, &data->data, NULL);
|
|
data->data = kvmemdup(data->data, data->size);
|
|
if (data->size && !data->data) {
|
|
kzfree(data->key);
|
|
kzfree(data);
|
|
goto fail;
|
|
}
|
|
|
|
rhashtable_insert_fast(profile->data, &data->head,
|
|
profile->data->p);
|
|
}
|
|
|
|
if (!unpack_nameX(e, AA_STRUCTEND, NULL)) {
|
|
info = "failed to unpack end of key, value data table";
|
|
goto fail;
|
|
}
|
|
}
|
|
|
|
if (!unpack_nameX(e, AA_STRUCTEND, NULL)) {
|
|
info = "failed to unpack end of profile";
|
|
goto fail;
|
|
}
|
|
|
|
return profile;
|
|
|
|
fail:
|
|
if (profile)
|
|
name = NULL;
|
|
else if (!name)
|
|
name = "unknown";
|
|
audit_iface(profile, NULL, name, info, e, error);
|
|
aa_free_profile(profile);
|
|
|
|
return ERR_PTR(error);
|
|
}
|
|
|
|
/**
|
|
* verify_head - unpack serialized stream header
|
|
* @e: serialized data read head (NOT NULL)
|
|
* @required: whether the header is required or optional
|
|
* @ns: Returns - namespace if one is specified else NULL (NOT NULL)
|
|
*
|
|
* Returns: error or 0 if header is good
|
|
*/
|
|
static int verify_header(struct aa_ext *e, int required, const char **ns)
|
|
{
|
|
int error = -EPROTONOSUPPORT;
|
|
const char *name = NULL;
|
|
*ns = NULL;
|
|
|
|
/* get the interface version */
|
|
if (!unpack_u32(e, &e->version, "version")) {
|
|
if (required) {
|
|
audit_iface(NULL, NULL, NULL, "invalid profile format",
|
|
e, error);
|
|
return error;
|
|
}
|
|
}
|
|
|
|
/* Check that the interface version is currently supported.
|
|
* if not specified use previous version
|
|
* Mask off everything that is not kernel abi version
|
|
*/
|
|
if (VERSION_LT(e->version, v5) || VERSION_GT(e->version, v7)) {
|
|
audit_iface(NULL, NULL, NULL, "unsupported interface version",
|
|
e, error);
|
|
return error;
|
|
}
|
|
|
|
/* read the namespace if present */
|
|
if (unpack_str(e, &name, "namespace")) {
|
|
if (*name == '\0') {
|
|
audit_iface(NULL, NULL, NULL, "invalid namespace name",
|
|
e, error);
|
|
return error;
|
|
}
|
|
if (*ns && strcmp(*ns, name))
|
|
audit_iface(NULL, NULL, NULL, "invalid ns change", e,
|
|
error);
|
|
else if (!*ns)
|
|
*ns = name;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static bool verify_xindex(int xindex, int table_size)
|
|
{
|
|
int index, xtype;
|
|
xtype = xindex & AA_X_TYPE_MASK;
|
|
index = xindex & AA_X_INDEX_MASK;
|
|
if (xtype == AA_X_TABLE && index >= table_size)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
/* verify dfa xindexes are in range of transition tables */
|
|
static bool verify_dfa_xindex(struct aa_dfa *dfa, int table_size)
|
|
{
|
|
int i;
|
|
for (i = 0; i < dfa->tables[YYTD_ID_ACCEPT]->td_lolen; i++) {
|
|
if (!verify_xindex(dfa_user_xindex(dfa, i), table_size))
|
|
return 0;
|
|
if (!verify_xindex(dfa_other_xindex(dfa, i), table_size))
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* verify_profile - Do post unpack analysis to verify profile consistency
|
|
* @profile: profile to verify (NOT NULL)
|
|
*
|
|
* Returns: 0 if passes verification else error
|
|
*/
|
|
static int verify_profile(struct aa_profile *profile)
|
|
{
|
|
if (profile->file.dfa &&
|
|
!verify_dfa_xindex(profile->file.dfa,
|
|
profile->file.trans.size)) {
|
|
audit_iface(profile, NULL, NULL, "Invalid named transition",
|
|
NULL, -EPROTO);
|
|
return -EPROTO;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void aa_load_ent_free(struct aa_load_ent *ent)
|
|
{
|
|
if (ent) {
|
|
aa_put_profile(ent->rename);
|
|
aa_put_profile(ent->old);
|
|
aa_put_profile(ent->new);
|
|
kfree(ent->ns_name);
|
|
kzfree(ent);
|
|
}
|
|
}
|
|
|
|
struct aa_load_ent *aa_load_ent_alloc(void)
|
|
{
|
|
struct aa_load_ent *ent = kzalloc(sizeof(*ent), GFP_KERNEL);
|
|
if (ent)
|
|
INIT_LIST_HEAD(&ent->list);
|
|
return ent;
|
|
}
|
|
|
|
/**
|
|
* aa_unpack - unpack packed binary profile(s) data loaded from user space
|
|
* @udata: user data copied to kmem (NOT NULL)
|
|
* @lh: list to place unpacked profiles in a aa_repl_ws
|
|
* @ns: Returns namespace profile is in if specified else NULL (NOT NULL)
|
|
*
|
|
* Unpack user data and return refcounted allocated profile(s) stored in
|
|
* @lh in order of discovery, with the list chain stored in base.list
|
|
* or error
|
|
*
|
|
* Returns: profile(s) on @lh else error pointer if fails to unpack
|
|
*/
|
|
int aa_unpack(struct aa_loaddata *udata, struct list_head *lh,
|
|
const char **ns)
|
|
{
|
|
struct aa_load_ent *tmp, *ent;
|
|
struct aa_profile *profile = NULL;
|
|
int error;
|
|
struct aa_ext e = {
|
|
.start = udata->data,
|
|
.end = udata->data + udata->size,
|
|
.pos = udata->data,
|
|
};
|
|
|
|
*ns = NULL;
|
|
while (e.pos < e.end) {
|
|
char *ns_name = NULL;
|
|
void *start;
|
|
error = verify_header(&e, e.pos == e.start, ns);
|
|
if (error)
|
|
goto fail;
|
|
|
|
start = e.pos;
|
|
profile = unpack_profile(&e, &ns_name);
|
|
if (IS_ERR(profile)) {
|
|
error = PTR_ERR(profile);
|
|
goto fail;
|
|
}
|
|
|
|
error = verify_profile(profile);
|
|
if (error)
|
|
goto fail_profile;
|
|
|
|
if (aa_g_hash_policy)
|
|
error = aa_calc_profile_hash(profile, e.version, start,
|
|
e.pos - start);
|
|
if (error)
|
|
goto fail_profile;
|
|
|
|
ent = aa_load_ent_alloc();
|
|
if (!ent) {
|
|
error = -ENOMEM;
|
|
goto fail_profile;
|
|
}
|
|
|
|
ent->new = profile;
|
|
ent->ns_name = ns_name;
|
|
list_add_tail(&ent->list, lh);
|
|
}
|
|
udata->abi = e.version & K_ABI_MASK;
|
|
if (aa_g_hash_policy) {
|
|
udata->hash = aa_calc_hash(udata->data, udata->size);
|
|
if (IS_ERR(udata->hash)) {
|
|
error = PTR_ERR(udata->hash);
|
|
udata->hash = NULL;
|
|
goto fail;
|
|
}
|
|
}
|
|
return 0;
|
|
|
|
fail_profile:
|
|
aa_put_profile(profile);
|
|
|
|
fail:
|
|
list_for_each_entry_safe(ent, tmp, lh, list) {
|
|
list_del_init(&ent->list);
|
|
aa_load_ent_free(ent);
|
|
}
|
|
|
|
return error;
|
|
}
|