security/apparmor/net.c

   1 /*
   2  * AppArmor security module
   3  *
   4  * This file contains AppArmor network mediation
   5  *
   6  * Copyright (C) 1998-2008 Novell/SUSE
   7  * Copyright 2009-2017 Canonical Ltd.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation, version 2 of the
  12  * License.
  13  */
  14
  15 #include "include/apparmor.h"
  16 #include "include/audit.h"
  17 #include "include/cred.h"
  18 #include "include/label.h"
  19 #include "include/net.h"
  20 #include "include/policy.h"
  21
  22 #include "net_names.h"
  23
  24
  25 struct aa_sfs_entry aa_sfs_entry_network[] = {
  26         AA_SFS_FILE_STRING("af_mask",   AA_SFS_AF_MASK),
  27         { }
  28 };
  29
  30 static const char * const net_mask_names[] = {
  31         "unknown",
  32         "send",
  33         "receive",
  34         "unknown",
  35
  36         "create",
  37         "shutdown",
  38         "connect",
  39         "unknown",
  40
  41         "setattr",
  42         "getattr",
  43         "setcred",
  44         "getcred",
  45
  46         "chmod",
  47         "chown",
  48         "chgrp",
  49         "lock",
  50
  51         "mmap",
  52         "mprot",
  53         "unknown",
  54         "unknown",
  55
  56         "accept",
  57         "bind",
  58         "listen",
  59         "unknown",
  60
  61         "setopt",
  62         "getopt",
  63         "unknown",
  64         "unknown",
  65
  66         "unknown",
  67         "unknown",
  68         "unknown",
  69         "unknown",
  70 };
  71
  72
  73 /* audit callback for net specific fields */
  74 void audit_net_cb(struct audit_buffer *ab, void *va)
  75 {
  76         struct common_audit_data *sa = va;
  77
  78         audit_log_format(ab, " family=");
  79         if (address_family_names[sa->u.net->family])
  80                 audit_log_string(ab, address_family_names[sa->u.net->family]);
  81         else
  82                 audit_log_format(ab, "\"unknown(%d)\"", sa->u.net->family);
  83         audit_log_format(ab, " sock_type=");
  84         if (sock_type_names[aad(sa)->net.type])
  85                 audit_log_string(ab, sock_type_names[aad(sa)->net.type]);
  86         else
  87                 audit_log_format(ab, "\"unknown(%d)\"", aad(sa)->net.type);
  88         audit_log_format(ab, " protocol=%d", aad(sa)->net.protocol);
  89
  90         if (aad(sa)->request & NET_PERMS_MASK) {
  91                 audit_log_format(ab, " requested_mask=");
  92                 aa_audit_perm_mask(ab, aad(sa)->request, NULL, 0,
  93                                    net_mask_names, NET_PERMS_MASK);
  94
  95                 if (aad(sa)->denied & NET_PERMS_MASK) {
  96                         audit_log_format(ab, " denied_mask=");
  97                         aa_audit_perm_mask(ab, aad(sa)->denied, NULL, 0,
  98                                            net_mask_names, NET_PERMS_MASK);
  99                 }
 100         }
 101         if (aad(sa)->peer) {
 102                 audit_log_format(ab, " peer=");
 103                 aa_label_xaudit(ab, labels_ns(aad(sa)->label), aad(sa)->peer,
 104                                 FLAGS_NONE, GFP_ATOMIC);
 105         }
 106 }
 107
 108 /* Generic af perm */
 109 int aa_profile_af_perm(struct aa_profile *profile, struct common_audit_data *sa,
 110                        u32 request, u16 family, int type)
 111 {
 112         struct aa_perms perms = { };
 113         unsigned int state;
 114         __be16 buffer[2];
 115
 116         AA_BUG(family >= AF_MAX);
 117         AA_BUG(type < 0 || type >= SOCK_MAX);
 118
 119         if (profile_unconfined(profile))
 120                 return 0;
 121         state = PROFILE_MEDIATES(profile, AA_CLASS_NET);
 122         if (!state)
 123                 return 0;
 124
 125         buffer[0] = cpu_to_be16(family);
 126         buffer[1] = cpu_to_be16((u16) type);
 127         state = aa_dfa_match_len(profile->policy.dfa, state, (char *) &buffer,
 128                                  4);
 129         aa_compute_perms(profile->policy.dfa, state, &perms);
 130         aa_apply_modes_to_perms(profile, &perms);
 131
 132         return aa_check_perms(profile, &perms, request, sa, audit_net_cb);
 133 }
 134
 135 int aa_af_perm(struct aa_label *label, const char *op, u32 request, u16 family,
 136                int type, int protocol)
 137 {
 138         struct aa_profile *profile;
 139         DEFINE_AUDIT_NET(sa, op, NULL, family, type, protocol);
 140
 141         return fn_for_each_confined(label, profile,
 142                         aa_profile_af_perm(profile, &sa, request, family,
 143                                            type));
 144 }
 145
 146 static int aa_label_sk_perm(struct aa_label *label, const char *op, u32 request,
 147                             struct sock *sk)
 148 {
 149         struct aa_profile *profile;
 150         DEFINE_AUDIT_SK(sa, op, sk);
 151
 152         AA_BUG(!label);
 153         AA_BUG(!sk);
 154
 155         if (unconfined(label))
 156                 return 0;
 157
 158         return fn_for_each_confined(label, profile,
 159                         aa_profile_af_sk_perm(profile, &sa, request, sk));
 160 }
 161
 162 int aa_sk_perm(const char *op, u32 request, struct sock *sk)
 163 {
 164         struct aa_label *label;
 165         int error;
 166
 167         AA_BUG(!sk);
 168         AA_BUG(in_interrupt());
 169
 170         /* TODO: switch to begin_current_label ???? */
 171         label = begin_current_label_crit_section();
 172         error = aa_label_sk_perm(label, op, request, sk);
 173         end_current_label_crit_section(label);
 174
 175         return error;
 176 }
 177
 178
 179 int aa_sock_file_perm(struct aa_label *label, const char *op, u32 request,
 180                       struct socket *sock)
 181 {
 182         AA_BUG(!label);
 183         AA_BUG(!sock);
 184         AA_BUG(!sock->sk);
 185
 186         return aa_label_sk_perm(label, op, request, sock->sk);
 187 }