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Linux/security/apparmor/net.c

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  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 }
188 

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