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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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188 lines
4.1 KiB
C
188 lines
4.1 KiB
C
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/*
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* AppArmor security module
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*
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* This file contains AppArmor network mediation
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*
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* Copyright (C) 1998-2008 Novell/SUSE
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* Copyright 2009-2017 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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#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/label.h"
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#include "include/net.h"
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#include "include/policy.h"
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#include "net_names.h"
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struct aa_sfs_entry aa_sfs_entry_network[] = {
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AA_SFS_FILE_STRING("af_mask", AA_SFS_AF_MASK),
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{ }
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};
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static const char * const net_mask_names[] = {
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"unknown",
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"send",
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"receive",
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"unknown",
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"create",
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"shutdown",
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"connect",
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"unknown",
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"setattr",
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"getattr",
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"setcred",
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"getcred",
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"chmod",
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"chown",
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"chgrp",
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"lock",
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"mmap",
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"mprot",
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"unknown",
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"unknown",
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"accept",
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"bind",
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"listen",
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"unknown",
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"setopt",
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"getopt",
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"unknown",
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"unknown",
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"unknown",
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"unknown",
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"unknown",
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"unknown",
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};
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/* audit callback for net specific fields */
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void audit_net_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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audit_log_format(ab, " family=");
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if (address_family_names[sa->u.net->family])
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audit_log_string(ab, address_family_names[sa->u.net->family]);
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else
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audit_log_format(ab, "\"unknown(%d)\"", sa->u.net->family);
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audit_log_format(ab, " sock_type=");
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if (sock_type_names[aad(sa)->net.type])
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audit_log_string(ab, sock_type_names[aad(sa)->net.type]);
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else
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audit_log_format(ab, "\"unknown(%d)\"", aad(sa)->net.type);
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audit_log_format(ab, " protocol=%d", aad(sa)->net.protocol);
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if (aad(sa)->request & NET_PERMS_MASK) {
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audit_log_format(ab, " requested_mask=");
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aa_audit_perm_mask(ab, aad(sa)->request, NULL, 0,
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net_mask_names, NET_PERMS_MASK);
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if (aad(sa)->denied & NET_PERMS_MASK) {
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audit_log_format(ab, " denied_mask=");
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aa_audit_perm_mask(ab, aad(sa)->denied, NULL, 0,
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net_mask_names, NET_PERMS_MASK);
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}
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}
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if (aad(sa)->peer) {
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audit_log_format(ab, " peer=");
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aa_label_xaudit(ab, labels_ns(aad(sa)->label), aad(sa)->peer,
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FLAGS_NONE, GFP_ATOMIC);
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}
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}
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/* Generic af perm */
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int aa_profile_af_perm(struct aa_profile *profile, struct common_audit_data *sa,
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u32 request, u16 family, int type)
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{
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struct aa_perms perms = { };
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unsigned int state;
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__be16 buffer[2];
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AA_BUG(family >= AF_MAX);
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AA_BUG(type < 0 || type >= SOCK_MAX);
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if (profile_unconfined(profile))
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return 0;
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state = PROFILE_MEDIATES(profile, AA_CLASS_NET);
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if (!state)
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return 0;
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buffer[0] = cpu_to_be16(family);
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buffer[1] = cpu_to_be16((u16) type);
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state = aa_dfa_match_len(profile->policy.dfa, state, (char *) &buffer,
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4);
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aa_compute_perms(profile->policy.dfa, state, &perms);
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aa_apply_modes_to_perms(profile, &perms);
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return aa_check_perms(profile, &perms, request, sa, audit_net_cb);
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}
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int aa_af_perm(struct aa_label *label, const char *op, u32 request, u16 family,
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int type, int protocol)
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{
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struct aa_profile *profile;
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DEFINE_AUDIT_NET(sa, op, NULL, family, type, protocol);
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return fn_for_each_confined(label, profile,
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aa_profile_af_perm(profile, &sa, request, family,
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type));
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}
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static int aa_label_sk_perm(struct aa_label *label, const char *op, u32 request,
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struct sock *sk)
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{
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struct aa_profile *profile;
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DEFINE_AUDIT_SK(sa, op, sk);
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AA_BUG(!label);
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AA_BUG(!sk);
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if (unconfined(label))
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return 0;
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return fn_for_each_confined(label, profile,
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aa_profile_af_sk_perm(profile, &sa, request, sk));
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}
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int aa_sk_perm(const char *op, u32 request, struct sock *sk)
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{
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struct aa_label *label;
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int error;
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AA_BUG(!sk);
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AA_BUG(in_interrupt());
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/* TODO: switch to begin_current_label ???? */
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label = begin_current_label_crit_section();
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error = aa_label_sk_perm(label, op, request, sk);
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end_current_label_crit_section(label);
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return error;
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}
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int aa_sock_file_perm(struct aa_label *label, const char *op, u32 request,
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struct socket *sock)
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{
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AA_BUG(!label);
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AA_BUG(!sock);
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AA_BUG(!sock->sk);
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return aa_label_sk_perm(label, op, request, sock->sk);
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}
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