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Commit | Line | Data |
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c2c0f25c | 1 | From e37c855a09ba7a8fa69334e9e3c7f5b0f66de896 Mon Sep 17 00:00:00 2001 |
0fa3db16 AM |
2 | From: John Johansen <john.johansen@canonical.com> |
3 | Date: Mon, 4 Oct 2010 15:03:36 -0700 | |
c2c0f25c | 4 | Subject: UBUNTU: SAUCE: AppArmor: basic networking rules |
1e8b8f9b AM |
5 | |
6 | Base support for network mediation. | |
76514441 AM |
7 | |
8 | Signed-off-by: John Johansen <john.johansen@canonical.com> | |
5882c9d4 | 9 | |
5882c9d4 AM |
10 | diff --git a/security/apparmor/.gitignore b/security/apparmor/.gitignore |
11 | index 9cdec70..d5b291e 100644 | |
12 | --- a/security/apparmor/.gitignore | |
13 | +++ b/security/apparmor/.gitignore | |
14 | @@ -1,5 +1,6 @@ | |
15 | # | |
16 | # Generated include files | |
17 | # | |
18 | +net_names.h | |
19 | capability_names.h | |
20 | rlim_names.h | |
fc63ffa9 | 21 | diff --git a/security/apparmor/Makefile b/security/apparmor/Makefile |
5882c9d4 | 22 | index d693df8..5dbb72f 100644 |
fc63ffa9 AM |
23 | --- a/security/apparmor/Makefile |
24 | +++ b/security/apparmor/Makefile | |
5882c9d4 | 25 | @@ -4,10 +4,10 @@ obj-$(CONFIG_SECURITY_APPARMOR) += apparmor.o |
ceaf2cfb | 26 | |
fc63ffa9 AM |
27 | apparmor-y := apparmorfs.o audit.o capability.o context.o ipc.o lib.o match.o \ |
28 | path.o domain.o policy.o policy_unpack.o procattr.o lsm.o \ | |
29 | - resource.o sid.o file.o | |
30 | + resource.o sid.o file.o net.o | |
5882c9d4 | 31 | apparmor-$(CONFIG_SECURITY_APPARMOR_HASH) += crypto.o |
ceaf2cfb | 32 | |
948a1326 | 33 | -clean-files := capability_names.h rlim_names.h |
1e8b8f9b | 34 | +clean-files := capability_names.h rlim_names.h net_names.h |
ceaf2cfb | 35 | |
ceaf2cfb | 36 | |
948a1326 | 37 | # Build a lower case string table of capability names |
5882c9d4 AM |
38 | @@ -25,6 +25,38 @@ cmd_make-caps = echo "static const char *const capability_names[] = {" > $@ ;\ |
39 | -e 's/^\#define[ \t]+CAP_([A-Z0-9_]+)[ \t]+([0-9]+)/\L\1/p' | \ | |
40 | tr '\n' ' ' | sed -e 's/ $$/"\n/' >> $@ | |
948a1326 | 41 | |
1e8b8f9b | 42 | +# Build a lower case string table of address family names |
948a1326 | 43 | +# Transform lines from |
1e8b8f9b AM |
44 | +# define AF_LOCAL 1 /* POSIX name for AF_UNIX */ |
45 | +# #define AF_INET 2 /* Internet IP Protocol */ | |
46 | +# to | |
47 | +# [1] = "local", | |
48 | +# [2] = "inet", | |
49 | +# | |
50 | +# and build the securityfs entries for the mapping. | |
51 | +# Transforms lines from | |
52 | +# #define AF_INET 2 /* Internet IP Protocol */ | |
948a1326 | 53 | +# to |
1e8b8f9b | 54 | +# #define AA_FS_AF_MASK "local inet" |
ceaf2cfb | 55 | +quiet_cmd_make-af = GEN $@ |
948a1326 | 56 | +cmd_make-af = echo "static const char *address_family_names[] = {" > $@ ;\ |
1e8b8f9b AM |
57 | + sed $< >>$@ -r -n -e "/AF_MAX/d" -e "/AF_LOCAL/d" -e \ |
58 | + 's/^\#define[ \t]+AF_([A-Z0-9_]+)[ \t]+([0-9]+)(.*)/[\2] = "\L\1",/p';\ | |
59 | + echo "};" >> $@ ;\ | |
60 | + echo -n '\#define AA_FS_AF_MASK "' >> $@ ;\ | |
61 | + sed -r -n 's/^\#define[ \t]+AF_([A-Z0-9_]+)[ \t]+([0-9]+)(.*)/\L\1/p'\ | |
62 | + $< | tr '\n' ' ' | sed -e 's/ $$/"\n/' >> $@ | |
63 | + | |
64 | +# Build a lower case string table of sock type names | |
65 | +# Transform lines from | |
66 | +# SOCK_STREAM = 1, | |
67 | +# to | |
68 | +# [1] = "stream", | |
69 | +quiet_cmd_make-sock = GEN $@ | |
70 | +cmd_make-sock = echo "static const char *sock_type_names[] = {" >> $@ ;\ | |
71 | + sed $^ >>$@ -r -n \ | |
72 | + -e 's/^\tSOCK_([A-Z0-9_]+)[\t]+=[ \t]+([0-9]+)(.*)/[\2] = "\L\1",/p';\ | |
948a1326 | 73 | + echo "};" >> $@ |
1e8b8f9b AM |
74 | |
75 | # Build a lower case string table of rlimit names. | |
76 | # Transforms lines from | |
5882c9d4 | 77 | @@ -61,6 +93,7 @@ cmd_make-rlim = echo "static const char *const rlim_names[RLIM_NLIMITS] = {" \ |
1e8b8f9b AM |
78 | tr '\n' ' ' | sed -e 's/ $$/"\n/' >> $@ |
79 | ||
fc63ffa9 | 80 | $(obj)/capability.o : $(obj)/capability_names.h |
1e8b8f9b | 81 | +$(obj)/net.o : $(obj)/net_names.h |
fc63ffa9 | 82 | $(obj)/resource.o : $(obj)/rlim_names.h |
5882c9d4 | 83 | $(obj)/capability_names.h : $(srctree)/include/uapi/linux/capability.h \ |
1e8b8f9b | 84 | $(src)/Makefile |
5882c9d4 AM |
85 | @@ -68,3 +101,8 @@ $(obj)/capability_names.h : $(srctree)/include/uapi/linux/capability.h \ |
86 | $(obj)/rlim_names.h : $(srctree)/include/uapi/asm-generic/resource.h \ | |
1e8b8f9b | 87 | $(src)/Makefile |
948a1326 | 88 | $(call cmd,make-rlim) |
1e8b8f9b AM |
89 | +$(obj)/net_names.h : $(srctree)/include/linux/socket.h \ |
90 | + $(srctree)/include/linux/net.h \ | |
91 | + $(src)/Makefile | |
948a1326 | 92 | + $(call cmd,make-af) |
1e8b8f9b AM |
93 | + $(call cmd,make-sock) |
94 | diff --git a/security/apparmor/apparmorfs.c b/security/apparmor/apparmorfs.c | |
c2c0f25c | 95 | index ad4fa49..6362c5a 100644 |
1e8b8f9b AM |
96 | --- a/security/apparmor/apparmorfs.c |
97 | +++ b/security/apparmor/apparmorfs.c | |
5882c9d4 AM |
98 | @@ -806,6 +806,7 @@ static struct aa_fs_entry aa_fs_entry_features[] = { |
99 | AA_FS_DIR("policy", aa_fs_entry_policy), | |
1e8b8f9b AM |
100 | AA_FS_DIR("domain", aa_fs_entry_domain), |
101 | AA_FS_DIR("file", aa_fs_entry_file), | |
102 | + AA_FS_DIR("network", aa_fs_entry_network), | |
103 | AA_FS_FILE_U64("capability", VFS_CAP_FLAGS_MASK), | |
104 | AA_FS_DIR("rlimit", aa_fs_entry_rlimit), | |
5882c9d4 | 105 | AA_FS_DIR("caps", aa_fs_entry_caps), |
1e8b8f9b | 106 | diff --git a/security/apparmor/include/audit.h b/security/apparmor/include/audit.h |
c2c0f25c | 107 | index ba3dfd1..5d3c419 100644 |
1e8b8f9b AM |
108 | --- a/security/apparmor/include/audit.h |
109 | +++ b/security/apparmor/include/audit.h | |
c2c0f25c | 110 | @@ -125,6 +125,10 @@ struct apparmor_audit_data { |
1e8b8f9b | 111 | u32 denied; |
5882c9d4 | 112 | kuid_t ouid; |
1e8b8f9b AM |
113 | } fs; |
114 | + struct { | |
115 | + int type, protocol; | |
116 | + struct sock *sk; | |
117 | + } net; | |
118 | }; | |
119 | }; | |
120 | ||
fc63ffa9 | 121 | diff --git a/security/apparmor/include/net.h b/security/apparmor/include/net.h |
ceaf2cfb | 122 | new file mode 100644 |
1e8b8f9b | 123 | index 0000000..cb8a121 |
ceaf2cfb | 124 | --- /dev/null |
fc63ffa9 | 125 | +++ b/security/apparmor/include/net.h |
1e8b8f9b | 126 | @@ -0,0 +1,44 @@ |
9474138d AM |
127 | +/* |
128 | + * AppArmor security module | |
129 | + * | |
fc63ffa9 | 130 | + * This file contains AppArmor network mediation definitions. |
9474138d AM |
131 | + * |
132 | + * Copyright (C) 1998-2008 Novell/SUSE | |
1e8b8f9b | 133 | + * Copyright 2009-2012 Canonical Ltd. |
9474138d AM |
134 | + * |
135 | + * This program is free software; you can redistribute it and/or | |
136 | + * modify it under the terms of the GNU General Public License as | |
137 | + * published by the Free Software Foundation, version 2 of the | |
138 | + * License. | |
139 | + */ | |
140 | + | |
fc63ffa9 AM |
141 | +#ifndef __AA_NET_H |
142 | +#define __AA_NET_H | |
2380c486 | 143 | + |
fc63ffa9 | 144 | +#include <net/sock.h> |
9474138d | 145 | + |
1e8b8f9b AM |
146 | +#include "apparmorfs.h" |
147 | + | |
fc63ffa9 AM |
148 | +/* struct aa_net - network confinement data |
149 | + * @allowed: basic network families permissions | |
150 | + * @audit_network: which network permissions to force audit | |
151 | + * @quiet_network: which network permissions to quiet rejects | |
152 | + */ | |
153 | +struct aa_net { | |
154 | + u16 allow[AF_MAX]; | |
155 | + u16 audit[AF_MAX]; | |
156 | + u16 quiet[AF_MAX]; | |
157 | +}; | |
ceaf2cfb | 158 | + |
1e8b8f9b AM |
159 | +extern struct aa_fs_entry aa_fs_entry_network[]; |
160 | + | |
fc63ffa9 AM |
161 | +extern int aa_net_perm(int op, struct aa_profile *profile, u16 family, |
162 | + int type, int protocol, struct sock *sk); | |
163 | +extern int aa_revalidate_sk(int op, struct sock *sk); | |
ceaf2cfb | 164 | + |
fc63ffa9 AM |
165 | +static inline void aa_free_net_rules(struct aa_net *new) |
166 | +{ | |
167 | + /* NOP */ | |
ceaf2cfb AM |
168 | +} |
169 | + | |
fc63ffa9 AM |
170 | +#endif /* __AA_NET_H */ |
171 | diff --git a/security/apparmor/include/policy.h b/security/apparmor/include/policy.h | |
5882c9d4 | 172 | index c28b0f2..b524d88 100644 |
fc63ffa9 AM |
173 | --- a/security/apparmor/include/policy.h |
174 | +++ b/security/apparmor/include/policy.h | |
175 | @@ -27,6 +27,7 @@ | |
176 | #include "capability.h" | |
177 | #include "domain.h" | |
178 | #include "file.h" | |
179 | +#include "net.h" | |
180 | #include "resource.h" | |
181 | ||
5882c9d4 AM |
182 | extern const char *const aa_profile_mode_names[]; |
183 | @@ -176,6 +177,7 @@ struct aa_replacedby { | |
1e8b8f9b | 184 | * @policy: general match rules governing policy |
fc63ffa9 AM |
185 | * @file: The set of rules governing basic file access and domain transitions |
186 | * @caps: capabilities for the profile | |
187 | + * @net: network controls for the profile | |
188 | * @rlimits: rlimits for the profile | |
189 | * | |
5882c9d4 AM |
190 | * @dents: dentries for the profiles file entries in apparmorfs |
191 | @@ -217,6 +219,7 @@ struct aa_profile { | |
1e8b8f9b | 192 | struct aa_policydb policy; |
fc63ffa9 AM |
193 | struct aa_file_rules file; |
194 | struct aa_caps caps; | |
195 | + struct aa_net net; | |
196 | struct aa_rlimit rlimits; | |
fc63ffa9 | 197 | |
5882c9d4 | 198 | unsigned char *hash; |
fc63ffa9 | 199 | diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c |
c2c0f25c | 200 | index dec607c..47fd244 100644 |
fc63ffa9 AM |
201 | --- a/security/apparmor/lsm.c |
202 | +++ b/security/apparmor/lsm.c | |
948a1326 | 203 | @@ -32,6 +32,7 @@ |
fc63ffa9 AM |
204 | #include "include/context.h" |
205 | #include "include/file.h" | |
206 | #include "include/ipc.h" | |
207 | +#include "include/net.h" | |
208 | #include "include/path.h" | |
209 | #include "include/policy.h" | |
210 | #include "include/procattr.h" | |
c2c0f25c | 211 | @@ -605,6 +606,104 @@ static int apparmor_task_setrlimit(struct task_struct *task, |
fc63ffa9 AM |
212 | return error; |
213 | } | |
214 | ||
215 | +static int apparmor_socket_create(int family, int type, int protocol, int kern) | |
ceaf2cfb | 216 | +{ |
fc63ffa9 AM |
217 | + struct aa_profile *profile; |
218 | + int error = 0; | |
ceaf2cfb | 219 | + |
fc63ffa9 AM |
220 | + if (kern) |
221 | + return 0; | |
ceaf2cfb | 222 | + |
fc63ffa9 AM |
223 | + profile = __aa_current_profile(); |
224 | + if (!unconfined(profile)) | |
225 | + error = aa_net_perm(OP_CREATE, profile, family, type, protocol, | |
226 | + NULL); | |
227 | + return error; | |
228 | +} | |
ceaf2cfb | 229 | + |
fc63ffa9 AM |
230 | +static int apparmor_socket_bind(struct socket *sock, |
231 | + struct sockaddr *address, int addrlen) | |
9474138d | 232 | +{ |
fc63ffa9 | 233 | + struct sock *sk = sock->sk; |
9474138d | 234 | + |
fc63ffa9 AM |
235 | + return aa_revalidate_sk(OP_BIND, sk); |
236 | +} | |
ceaf2cfb | 237 | + |
fc63ffa9 AM |
238 | +static int apparmor_socket_connect(struct socket *sock, |
239 | + struct sockaddr *address, int addrlen) | |
240 | +{ | |
241 | + struct sock *sk = sock->sk; | |
ceaf2cfb | 242 | + |
fc63ffa9 | 243 | + return aa_revalidate_sk(OP_CONNECT, sk); |
9474138d AM |
244 | +} |
245 | + | |
fc63ffa9 | 246 | +static int apparmor_socket_listen(struct socket *sock, int backlog) |
9474138d | 247 | +{ |
fc63ffa9 AM |
248 | + struct sock *sk = sock->sk; |
249 | + | |
250 | + return aa_revalidate_sk(OP_LISTEN, sk); | |
9474138d AM |
251 | +} |
252 | + | |
fc63ffa9 | 253 | +static int apparmor_socket_accept(struct socket *sock, struct socket *newsock) |
9474138d | 254 | +{ |
fc63ffa9 | 255 | + struct sock *sk = sock->sk; |
9474138d | 256 | + |
fc63ffa9 AM |
257 | + return aa_revalidate_sk(OP_ACCEPT, sk); |
258 | +} | |
9474138d | 259 | + |
fc63ffa9 AM |
260 | +static int apparmor_socket_sendmsg(struct socket *sock, |
261 | + struct msghdr *msg, int size) | |
76514441 | 262 | +{ |
fc63ffa9 | 263 | + struct sock *sk = sock->sk; |
76514441 | 264 | + |
fc63ffa9 | 265 | + return aa_revalidate_sk(OP_SENDMSG, sk); |
76514441 AM |
266 | +} |
267 | + | |
fc63ffa9 AM |
268 | +static int apparmor_socket_recvmsg(struct socket *sock, |
269 | + struct msghdr *msg, int size, int flags) | |
270 | +{ | |
271 | + struct sock *sk = sock->sk; | |
ceaf2cfb | 272 | + |
fc63ffa9 AM |
273 | + return aa_revalidate_sk(OP_RECVMSG, sk); |
274 | +} | |
ceaf2cfb | 275 | + |
fc63ffa9 AM |
276 | +static int apparmor_socket_getsockname(struct socket *sock) |
277 | +{ | |
278 | + struct sock *sk = sock->sk; | |
ceaf2cfb | 279 | + |
fc63ffa9 | 280 | + return aa_revalidate_sk(OP_GETSOCKNAME, sk); |
9474138d AM |
281 | +} |
282 | + | |
fc63ffa9 | 283 | +static int apparmor_socket_getpeername(struct socket *sock) |
9474138d | 284 | +{ |
fc63ffa9 | 285 | + struct sock *sk = sock->sk; |
9474138d | 286 | + |
fc63ffa9 AM |
287 | + return aa_revalidate_sk(OP_GETPEERNAME, sk); |
288 | +} | |
ceaf2cfb | 289 | + |
fc63ffa9 AM |
290 | +static int apparmor_socket_getsockopt(struct socket *sock, int level, |
291 | + int optname) | |
292 | +{ | |
293 | + struct sock *sk = sock->sk; | |
ceaf2cfb | 294 | + |
fc63ffa9 AM |
295 | + return aa_revalidate_sk(OP_GETSOCKOPT, sk); |
296 | +} | |
ceaf2cfb | 297 | + |
fc63ffa9 AM |
298 | +static int apparmor_socket_setsockopt(struct socket *sock, int level, |
299 | + int optname) | |
300 | +{ | |
301 | + struct sock *sk = sock->sk; | |
2380c486 | 302 | + |
fc63ffa9 AM |
303 | + return aa_revalidate_sk(OP_SETSOCKOPT, sk); |
304 | +} | |
ceaf2cfb | 305 | + |
fc63ffa9 AM |
306 | +static int apparmor_socket_shutdown(struct socket *sock, int how) |
307 | +{ | |
308 | + struct sock *sk = sock->sk; | |
ceaf2cfb | 309 | + |
fc63ffa9 | 310 | + return aa_revalidate_sk(OP_SOCK_SHUTDOWN, sk); |
ceaf2cfb | 311 | +} |
948a1326 | 312 | + |
c2c0f25c AM |
313 | static struct security_hook_list apparmor_hooks[] = { |
314 | LSM_HOOK_INIT(ptrace_access_check, apparmor_ptrace_access_check), | |
315 | LSM_HOOK_INIT(ptrace_traceme, apparmor_ptrace_traceme), | |
316 | @@ -634,6 +733,19 @@ static struct security_hook_list apparmor_hooks[] = { | |
317 | LSM_HOOK_INIT(getprocattr, apparmor_getprocattr), | |
318 | LSM_HOOK_INIT(setprocattr, apparmor_setprocattr), | |
5d26c04f | 319 | |
c2c0f25c AM |
320 | + LSM_HOOK_INIT(socket_create, apparmor_socket_create), |
321 | + LSM_HOOK_INIT(socket_bind, apparmor_socket_bind), | |
322 | + LSM_HOOK_INIT(socket_connect, apparmor_socket_connect), | |
323 | + LSM_HOOK_INIT(socket_listen, apparmor_socket_listen), | |
324 | + LSM_HOOK_INIT(socket_accept, apparmor_socket_accept), | |
325 | + LSM_HOOK_INIT(socket_sendmsg, apparmor_socket_sendmsg), | |
326 | + LSM_HOOK_INIT(socket_recvmsg, apparmor_socket_recvmsg), | |
327 | + LSM_HOOK_INIT(socket_getsockname, apparmor_socket_getsockname), | |
328 | + LSM_HOOK_INIT(socket_getpeername, apparmor_socket_getpeername), | |
329 | + LSM_HOOK_INIT(socket_getsockopt, apparmor_socket_getsockopt), | |
330 | + LSM_HOOK_INIT(socket_setsockopt, apparmor_socket_setsockopt), | |
331 | + LSM_HOOK_INIT(socket_shutdown, apparmor_socket_shutdown), | |
332 | + | |
333 | LSM_HOOK_INIT(cred_alloc_blank, apparmor_cred_alloc_blank), | |
334 | LSM_HOOK_INIT(cred_free, apparmor_cred_free), | |
335 | LSM_HOOK_INIT(cred_prepare, apparmor_cred_prepare), | |
fc63ffa9 | 336 | diff --git a/security/apparmor/net.c b/security/apparmor/net.c |
ceaf2cfb | 337 | new file mode 100644 |
2dfbb274 | 338 | index 0000000..003dd18 |
ceaf2cfb | 339 | --- /dev/null |
fc63ffa9 | 340 | +++ b/security/apparmor/net.c |
1e8b8f9b | 341 | @@ -0,0 +1,162 @@ |
2380c486 | 342 | +/* |
9474138d AM |
343 | + * AppArmor security module |
344 | + * | |
fc63ffa9 | 345 | + * This file contains AppArmor network mediation |
2380c486 | 346 | + * |
9474138d | 347 | + * Copyright (C) 1998-2008 Novell/SUSE |
1e8b8f9b | 348 | + * Copyright 2009-2012 Canonical Ltd. |
2380c486 | 349 | + * |
9474138d AM |
350 | + * This program is free software; you can redistribute it and/or |
351 | + * modify it under the terms of the GNU General Public License as | |
352 | + * published by the Free Software Foundation, version 2 of the | |
353 | + * License. | |
2380c486 JR |
354 | + */ |
355 | + | |
9474138d AM |
356 | +#include "include/apparmor.h" |
357 | +#include "include/audit.h" | |
358 | +#include "include/context.h" | |
fc63ffa9 | 359 | +#include "include/net.h" |
9474138d | 360 | +#include "include/policy.h" |
2380c486 | 361 | + |
1e8b8f9b AM |
362 | +#include "net_names.h" |
363 | + | |
364 | +struct aa_fs_entry aa_fs_entry_network[] = { | |
365 | + AA_FS_FILE_STRING("af_mask", AA_FS_AF_MASK), | |
366 | + { } | |
9474138d AM |
367 | +}; |
368 | + | |
fc63ffa9 | 369 | +/* audit callback for net specific fields */ |
76514441 | 370 | +static void audit_cb(struct audit_buffer *ab, void *va) |
9474138d | 371 | +{ |
76514441 | 372 | + struct common_audit_data *sa = va; |
9474138d | 373 | + |
fc63ffa9 | 374 | + audit_log_format(ab, " family="); |
1e8b8f9b AM |
375 | + if (address_family_names[sa->u.net->family]) { |
376 | + audit_log_string(ab, address_family_names[sa->u.net->family]); | |
fc63ffa9 | 377 | + } else { |
1e8b8f9b | 378 | + audit_log_format(ab, "\"unknown(%d)\"", sa->u.net->family); |
fc63ffa9 | 379 | + } |
fc63ffa9 | 380 | + audit_log_format(ab, " sock_type="); |
1e8b8f9b AM |
381 | + if (sock_type_names[sa->aad->net.type]) { |
382 | + audit_log_string(ab, sock_type_names[sa->aad->net.type]); | |
fc63ffa9 | 383 | + } else { |
1e8b8f9b | 384 | + audit_log_format(ab, "\"unknown(%d)\"", sa->aad->net.type); |
fc63ffa9 | 385 | + } |
1e8b8f9b | 386 | + audit_log_format(ab, " protocol=%d", sa->aad->net.protocol); |
2380c486 JR |
387 | +} |
388 | + | |
389 | +/** | |
fc63ffa9 AM |
390 | + * audit_net - audit network access |
391 | + * @profile: profile being enforced (NOT NULL) | |
392 | + * @op: operation being checked | |
393 | + * @family: network family | |
394 | + * @type: network type | |
395 | + * @protocol: network protocol | |
396 | + * @sk: socket auditing is being applied to | |
397 | + * @error: error code for failure else 0 | |
ceaf2cfb | 398 | + * |
fc63ffa9 | 399 | + * Returns: %0 or sa->error else other errorcode on failure |
2380c486 | 400 | + */ |
fc63ffa9 AM |
401 | +static int audit_net(struct aa_profile *profile, int op, u16 family, int type, |
402 | + int protocol, struct sock *sk, int error) | |
2380c486 | 403 | +{ |
fc63ffa9 AM |
404 | + int audit_type = AUDIT_APPARMOR_AUTO; |
405 | + struct common_audit_data sa; | |
1e8b8f9b AM |
406 | + struct apparmor_audit_data aad = { }; |
407 | + struct lsm_network_audit net = { }; | |
fc63ffa9 | 408 | + if (sk) { |
0c3ec466 | 409 | + sa.type = LSM_AUDIT_DATA_NET; |
fc63ffa9 | 410 | + } else { |
0c3ec466 | 411 | + sa.type = LSM_AUDIT_DATA_NONE; |
2380c486 | 412 | + } |
fc63ffa9 | 413 | + /* todo fill in socket addr info */ |
1e8b8f9b AM |
414 | + sa.aad = &aad; |
415 | + sa.u.net = &net; | |
416 | + sa.aad->op = op, | |
417 | + sa.u.net->family = family; | |
418 | + sa.u.net->sk = sk; | |
419 | + sa.aad->net.type = type; | |
420 | + sa.aad->net.protocol = protocol; | |
421 | + sa.aad->error = error; | |
422 | + | |
423 | + if (likely(!sa.aad->error)) { | |
424 | + u16 audit_mask = profile->net.audit[sa.u.net->family]; | |
fc63ffa9 | 425 | + if (likely((AUDIT_MODE(profile) != AUDIT_ALL) && |
1e8b8f9b | 426 | + !(1 << sa.aad->net.type & audit_mask))) |
ceaf2cfb | 427 | + return 0; |
fc63ffa9 AM |
428 | + audit_type = AUDIT_APPARMOR_AUDIT; |
429 | + } else { | |
1e8b8f9b | 430 | + u16 quiet_mask = profile->net.quiet[sa.u.net->family]; |
fc63ffa9 | 431 | + u16 kill_mask = 0; |
1e8b8f9b | 432 | + u16 denied = (1 << sa.aad->net.type) & ~quiet_mask; |
9474138d | 433 | + |
fc63ffa9 AM |
434 | + if (denied & kill_mask) |
435 | + audit_type = AUDIT_APPARMOR_KILL; | |
9474138d | 436 | + |
fc63ffa9 AM |
437 | + if ((denied & quiet_mask) && |
438 | + AUDIT_MODE(profile) != AUDIT_NOQUIET && | |
439 | + AUDIT_MODE(profile) != AUDIT_ALL) | |
1e8b8f9b | 440 | + return COMPLAIN_MODE(profile) ? 0 : sa.aad->error; |
9474138d AM |
441 | + } |
442 | + | |
fc63ffa9 | 443 | + return aa_audit(audit_type, profile, GFP_KERNEL, &sa, audit_cb); |
ceaf2cfb AM |
444 | +} |
445 | + | |
2380c486 | 446 | +/** |
fc63ffa9 AM |
447 | + * aa_net_perm - very course network access check |
448 | + * @op: operation being checked | |
449 | + * @profile: profile being enforced (NOT NULL) | |
450 | + * @family: network family | |
451 | + * @type: network type | |
452 | + * @protocol: network protocol | |
2380c486 | 453 | + * |
fc63ffa9 | 454 | + * Returns: %0 else error if permission denied |
2380c486 | 455 | + */ |
fc63ffa9 AM |
456 | +int aa_net_perm(int op, struct aa_profile *profile, u16 family, int type, |
457 | + int protocol, struct sock *sk) | |
2380c486 | 458 | +{ |
fc63ffa9 AM |
459 | + u16 family_mask; |
460 | + int error; | |
ceaf2cfb | 461 | + |
fc63ffa9 AM |
462 | + if ((family < 0) || (family >= AF_MAX)) |
463 | + return -EINVAL; | |
ceaf2cfb | 464 | + |
fc63ffa9 AM |
465 | + if ((type < 0) || (type >= SOCK_MAX)) |
466 | + return -EINVAL; | |
76514441 | 467 | + |
fc63ffa9 AM |
468 | + /* unix domain and netlink sockets are handled by ipc */ |
469 | + if (family == AF_UNIX || family == AF_NETLINK) | |
470 | + return 0; | |
76514441 | 471 | + |
fc63ffa9 | 472 | + family_mask = profile->net.allow[family]; |
2380c486 | 473 | + |
fc63ffa9 | 474 | + error = (family_mask & (1 << type)) ? 0 : -EACCES; |
ceaf2cfb | 475 | + |
fc63ffa9 | 476 | + return audit_net(profile, op, family, type, protocol, sk, error); |
2380c486 JR |
477 | +} |
478 | + | |
76514441 | 479 | +/** |
fc63ffa9 AM |
480 | + * aa_revalidate_sk - Revalidate access to a sock |
481 | + * @op: operation being checked | |
482 | + * @sk: sock being revalidated (NOT NULL) | |
76514441 | 483 | + * |
fc63ffa9 | 484 | + * Returns: %0 else error if permission denied |
76514441 | 485 | + */ |
fc63ffa9 | 486 | +int aa_revalidate_sk(int op, struct sock *sk) |
2380c486 | 487 | +{ |
fc63ffa9 AM |
488 | + struct aa_profile *profile; |
489 | + int error = 0; | |
2380c486 | 490 | + |
fc63ffa9 AM |
491 | + /* aa_revalidate_sk should not be called from interrupt context |
492 | + * don't mediate these calls as they are not task related | |
493 | + */ | |
494 | + if (in_interrupt()) | |
495 | + return 0; | |
ceaf2cfb | 496 | + |
fc63ffa9 AM |
497 | + profile = __aa_current_profile(); |
498 | + if (!unconfined(profile)) | |
499 | + error = aa_net_perm(op, profile, sk->sk_family, sk->sk_type, | |
500 | + sk->sk_protocol, sk); | |
2380c486 | 501 | + |
fc63ffa9 | 502 | + return error; |
2380c486 | 503 | +} |
fc63ffa9 | 504 | diff --git a/security/apparmor/policy.c b/security/apparmor/policy.c |
5882c9d4 | 505 | index 705c287..e2afe29 100644 |
fc63ffa9 AM |
506 | --- a/security/apparmor/policy.c |
507 | +++ b/security/apparmor/policy.c | |
5882c9d4 | 508 | @@ -603,6 +603,7 @@ void aa_free_profile(struct aa_profile *profile) |
fc63ffa9 AM |
509 | |
510 | aa_free_file_rules(&profile->file); | |
511 | aa_free_cap_rules(&profile->caps); | |
512 | + aa_free_net_rules(&profile->net); | |
513 | aa_free_rlimit_rules(&profile->rlimits); | |
514 | ||
5882c9d4 | 515 | kzfree(profile->dirname); |
fc63ffa9 | 516 | diff --git a/security/apparmor/policy_unpack.c b/security/apparmor/policy_unpack.c |
5882c9d4 | 517 | index a689f10..1a35e6b 100644 |
fc63ffa9 AM |
518 | --- a/security/apparmor/policy_unpack.c |
519 | +++ b/security/apparmor/policy_unpack.c | |
1e8b8f9b | 520 | @@ -193,6 +193,19 @@ fail: |
fc63ffa9 AM |
521 | return 0; |
522 | } | |
523 | ||
524 | +static bool unpack_u16(struct aa_ext *e, u16 *data, const char *name) | |
2380c486 | 525 | +{ |
fc63ffa9 AM |
526 | + if (unpack_nameX(e, AA_U16, name)) { |
527 | + if (!inbounds(e, sizeof(u16))) | |
528 | + return 0; | |
529 | + if (data) | |
530 | + *data = le16_to_cpu(get_unaligned((u16 *) e->pos)); | |
531 | + e->pos += sizeof(u16); | |
532 | + return 1; | |
2380c486 | 533 | + } |
2380c486 JR |
534 | + return 0; |
535 | +} | |
536 | + | |
fc63ffa9 AM |
537 | static bool unpack_u32(struct aa_ext *e, u32 *data, const char *name) |
538 | { | |
539 | if (unpack_nameX(e, AA_U32, name)) { | |
5882c9d4 | 540 | @@ -476,6 +489,7 @@ static struct aa_profile *unpack_profile(struct aa_ext *e) |
fc63ffa9 AM |
541 | { |
542 | struct aa_profile *profile = NULL; | |
543 | const char *name = NULL; | |
2380c486 | 544 | + size_t size = 0; |
1e8b8f9b | 545 | int i, error = -EPROTO; |
fc63ffa9 AM |
546 | kernel_cap_t tmpcap; |
547 | u32 tmp; | |
5882c9d4 | 548 | @@ -576,6 +590,38 @@ static struct aa_profile *unpack_profile(struct aa_ext *e) |
fc63ffa9 AM |
549 | if (!unpack_rlimits(e, profile)) |
550 | goto fail; | |
551 | ||
ceaf2cfb | 552 | + size = unpack_array(e, "net_allowed_af"); |
2380c486 | 553 | + if (size) { |
2380c486 JR |
554 | + |
555 | + for (i = 0; i < size; i++) { | |
fc63ffa9 AM |
556 | + /* discard extraneous rules that this kernel will |
557 | + * never request | |
558 | + */ | |
1efb82ae | 559 | + if (i >= AF_MAX) { |
fc63ffa9 AM |
560 | + u16 tmp; |
561 | + if (!unpack_u16(e, &tmp, NULL) || | |
562 | + !unpack_u16(e, &tmp, NULL) || | |
563 | + !unpack_u16(e, &tmp, NULL)) | |
564 | + goto fail; | |
565 | + continue; | |
566 | + } | |
76514441 | 567 | + if (!unpack_u16(e, &profile->net.allow[i], NULL)) |
2380c486 | 568 | + goto fail; |
ceaf2cfb | 569 | + if (!unpack_u16(e, &profile->net.audit[i], NULL)) |
2380c486 | 570 | + goto fail; |
ceaf2cfb | 571 | + if (!unpack_u16(e, &profile->net.quiet[i], NULL)) |
2380c486 JR |
572 | + goto fail; |
573 | + } | |
ceaf2cfb | 574 | + if (!unpack_nameX(e, AA_ARRAYEND, NULL)) |
2380c486 | 575 | + goto fail; |
2380c486 | 576 | + } |
1e8b8f9b AM |
577 | + /* |
578 | + * allow unix domain and netlink sockets they are handled | |
579 | + * by IPC | |
580 | + */ | |
76514441 AM |
581 | + profile->net.allow[AF_UNIX] = 0xffff; |
582 | + profile->net.allow[AF_NETLINK] = 0xffff; | |
2380c486 | 583 | + |
1e8b8f9b AM |
584 | if (unpack_nameX(e, AA_STRUCT, "policydb")) { |
585 | /* generic policy dfa - optional and may be NULL */ | |
586 | profile->policy.dfa = unpack_dfa(e); | |
0fa3db16 | 587 | -- |
c2c0f25c | 588 | cgit v0.10.2 |
1e8b8f9b | 589 | |
c2c0f25c | 590 | From 6b77d90baf3807b70ca17309ad6c0bd39f3297e7 Mon Sep 17 00:00:00 2001 |
5882c9d4 AM |
591 | From: John Johansen <john.johansen@canonical.com> |
592 | Date: Fri, 29 Jun 2012 17:34:00 -0700 | |
c2c0f25c | 593 | Subject: apparmor: Fix quieting of audit messages for network mediation |
5882c9d4 AM |
594 | |
595 | If a profile specified a quieting of network denials for a given rule by | |
596 | either the quiet or deny rule qualifiers, the resultant quiet mask for | |
597 | denied requests was applied incorrectly, resulting in two potential bugs. | |
598 | 1. The misapplied quiet mask would prevent denials from being correctly | |
599 | tested against the kill mask/mode. Thus network access requests that | |
600 | should have resulted in the application being killed did not. | |
601 | ||
602 | 2. The actual quieting of the denied network request was not being applied. | |
603 | This would result in network rejections always being logged even when | |
604 | they had been specifically marked as quieted. | |
605 | ||
606 | Signed-off-by: John Johansen <john.johansen@canonical.com> | |
5882c9d4 AM |
607 | |
608 | diff --git a/security/apparmor/net.c b/security/apparmor/net.c | |
609 | index 003dd18..6e6e5c9 100644 | |
610 | --- a/security/apparmor/net.c | |
611 | +++ b/security/apparmor/net.c | |
612 | @@ -88,7 +88,7 @@ static int audit_net(struct aa_profile *profile, int op, u16 family, int type, | |
613 | } else { | |
614 | u16 quiet_mask = profile->net.quiet[sa.u.net->family]; | |
615 | u16 kill_mask = 0; | |
616 | - u16 denied = (1 << sa.aad->net.type) & ~quiet_mask; | |
617 | + u16 denied = (1 << sa.aad->net.type); | |
618 | ||
619 | if (denied & kill_mask) | |
620 | audit_type = AUDIT_APPARMOR_KILL; | |
621 | -- | |
c2c0f25c | 622 | cgit v0.10.2 |
5882c9d4 | 623 | |
c2c0f25c | 624 | From a71049ba973b214e88eae89f9cb0c4965d184ead Mon Sep 17 00:00:00 2001 |
0fa3db16 AM |
625 | From: John Johansen <john.johansen@canonical.com> |
626 | Date: Wed, 16 May 2012 10:58:05 -0700 | |
c2c0f25c | 627 | Subject: UBUNTU: SAUCE: apparmor: Add the ability to mediate mount |
1e8b8f9b AM |
628 | |
629 | Add the ability for apparmor to do mediation of mount operations. Mount | |
630 | rules require an updated apparmor_parser (2.8 series) for policy compilation. | |
631 | ||
632 | The basic form of the rules are. | |
633 | ||
634 | [audit] [deny] mount [conds]* [device] [ -> [conds] path], | |
635 | [audit] [deny] remount [conds]* [path], | |
636 | [audit] [deny] umount [conds]* [path], | |
637 | [audit] [deny] pivotroot [oldroot=<value>] <path> | |
638 | ||
639 | remount is just a short cut for mount options=remount | |
640 | ||
641 | where [conds] can be | |
642 | fstype=<expr> | |
643 | options=<expr> | |
644 | ||
645 | Example mount commands | |
646 | mount, # allow all mounts, but not umount or pivotroot | |
647 | ||
648 | mount fstype=procfs, # allow mounting procfs anywhere | |
649 | ||
650 | mount options=(bind, ro) /foo -> /bar, # readonly bind mount | |
651 | ||
652 | mount /dev/sda -> /mnt, | |
653 | ||
654 | mount /dev/sd** -> /mnt/**, | |
655 | ||
656 | mount fstype=overlayfs options=(rw,upperdir=/tmp/upper/,lowerdir=/) -> /mnt/ | |
657 | ||
658 | umount, | |
659 | ||
660 | umount /m*, | |
661 | ||
662 | See the apparmor userspace for full documentation | |
fc63ffa9 AM |
663 | |
664 | Signed-off-by: John Johansen <john.johansen@canonical.com> | |
1e8b8f9b | 665 | Acked-by: Kees Cook <kees@ubuntu.com> |
5882c9d4 | 666 | |
fc63ffa9 | 667 | diff --git a/security/apparmor/Makefile b/security/apparmor/Makefile |
5882c9d4 | 668 | index 5dbb72f..89b3445 100644 |
fc63ffa9 AM |
669 | --- a/security/apparmor/Makefile |
670 | +++ b/security/apparmor/Makefile | |
1e8b8f9b AM |
671 | @@ -4,7 +4,7 @@ obj-$(CONFIG_SECURITY_APPARMOR) += apparmor.o |
672 | ||
948a1326 | 673 | apparmor-y := apparmorfs.o audit.o capability.o context.o ipc.o lib.o match.o \ |
fc63ffa9 | 674 | path.o domain.o policy.o policy_unpack.o procattr.o lsm.o \ |
1e8b8f9b AM |
675 | - resource.o sid.o file.o net.o |
676 | + resource.o sid.o file.o net.o mount.o | |
5882c9d4 | 677 | apparmor-$(CONFIG_SECURITY_APPARMOR_HASH) += crypto.o |
fc63ffa9 | 678 | |
1e8b8f9b | 679 | clean-files := capability_names.h rlim_names.h net_names.h |
1e8b8f9b | 680 | diff --git a/security/apparmor/apparmorfs.c b/security/apparmor/apparmorfs.c |
c2c0f25c | 681 | index 6362c5a..4917747 100644 |
1e8b8f9b AM |
682 | --- a/security/apparmor/apparmorfs.c |
683 | +++ b/security/apparmor/apparmorfs.c | |
5882c9d4 | 684 | @@ -799,7 +799,18 @@ static struct aa_fs_entry aa_fs_entry_domain[] = { |
1e8b8f9b | 685 | |
5882c9d4 AM |
686 | static struct aa_fs_entry aa_fs_entry_policy[] = { |
687 | AA_FS_FILE_BOOLEAN("set_load", 1), | |
688 | - {} | |
689 | + { } | |
690 | +}; | |
691 | + | |
1e8b8f9b AM |
692 | +static struct aa_fs_entry aa_fs_entry_mount[] = { |
693 | + AA_FS_FILE_STRING("mask", "mount umount"), | |
694 | + { } | |
695 | +}; | |
696 | + | |
697 | +static struct aa_fs_entry aa_fs_entry_namespaces[] = { | |
698 | + AA_FS_FILE_BOOLEAN("profile", 1), | |
699 | + AA_FS_FILE_BOOLEAN("pivot_root", 1), | |
700 | + { } | |
5882c9d4 AM |
701 | }; |
702 | ||
1e8b8f9b | 703 | static struct aa_fs_entry aa_fs_entry_features[] = { |
5882c9d4 | 704 | @@ -807,6 +818,8 @@ static struct aa_fs_entry aa_fs_entry_features[] = { |
1e8b8f9b AM |
705 | AA_FS_DIR("domain", aa_fs_entry_domain), |
706 | AA_FS_DIR("file", aa_fs_entry_file), | |
707 | AA_FS_DIR("network", aa_fs_entry_network), | |
708 | + AA_FS_DIR("mount", aa_fs_entry_mount), | |
709 | + AA_FS_DIR("namespaces", aa_fs_entry_namespaces), | |
710 | AA_FS_FILE_U64("capability", VFS_CAP_FLAGS_MASK), | |
711 | AA_FS_DIR("rlimit", aa_fs_entry_rlimit), | |
5882c9d4 | 712 | AA_FS_DIR("caps", aa_fs_entry_caps), |
1e8b8f9b | 713 | diff --git a/security/apparmor/audit.c b/security/apparmor/audit.c |
c2c0f25c | 714 | index 89c7865..7fdb5d7 100644 |
1e8b8f9b AM |
715 | --- a/security/apparmor/audit.c |
716 | +++ b/security/apparmor/audit.c | |
717 | @@ -44,6 +44,10 @@ const char *const op_table[] = { | |
718 | "file_mmap", | |
719 | "file_mprotect", | |
720 | ||
721 | + "pivotroot", | |
722 | + "mount", | |
723 | + "umount", | |
724 | + | |
725 | "create", | |
726 | "post_create", | |
727 | "bind", | |
728 | diff --git a/security/apparmor/domain.c b/security/apparmor/domain.c | |
c2c0f25c | 729 | index dc0027b..a2e3813 100644 |
1e8b8f9b AM |
730 | --- a/security/apparmor/domain.c |
731 | +++ b/security/apparmor/domain.c | |
c2c0f25c | 732 | @@ -236,7 +236,7 @@ static const char *next_name(int xtype, const char *name) |
1e8b8f9b AM |
733 | * |
734 | * Returns: refcounted profile, or NULL on failure (MAYBE NULL) | |
735 | */ | |
736 | -static struct aa_profile *x_table_lookup(struct aa_profile *profile, u32 xindex) | |
737 | +struct aa_profile *x_table_lookup(struct aa_profile *profile, u32 xindex) | |
738 | { | |
739 | struct aa_profile *new_profile = NULL; | |
740 | struct aa_namespace *ns = profile->ns; | |
741 | diff --git a/security/apparmor/include/apparmor.h b/security/apparmor/include/apparmor.h | |
c2c0f25c | 742 | index e4ea626..ce6ff6a 100644 |
1e8b8f9b AM |
743 | --- a/security/apparmor/include/apparmor.h |
744 | +++ b/security/apparmor/include/apparmor.h | |
5882c9d4 | 745 | @@ -30,8 +30,9 @@ |
1e8b8f9b AM |
746 | #define AA_CLASS_NET 4 |
747 | #define AA_CLASS_RLIMITS 5 | |
748 | #define AA_CLASS_DOMAIN 6 | |
749 | +#define AA_CLASS_MOUNT 7 | |
750 | ||
751 | -#define AA_CLASS_LAST AA_CLASS_DOMAIN | |
752 | +#define AA_CLASS_LAST AA_CLASS_MOUNT | |
753 | ||
754 | /* Control parameters settable through module/boot flags */ | |
755 | extern enum audit_mode aa_g_audit; | |
756 | diff --git a/security/apparmor/include/audit.h b/security/apparmor/include/audit.h | |
c2c0f25c | 757 | index 5d3c419..b9f1d57 100644 |
1e8b8f9b AM |
758 | --- a/security/apparmor/include/audit.h |
759 | +++ b/security/apparmor/include/audit.h | |
5882c9d4 | 760 | @@ -72,6 +72,10 @@ enum aa_ops { |
1e8b8f9b AM |
761 | OP_FMMAP, |
762 | OP_FMPROT, | |
763 | ||
764 | + OP_PIVOTROOT, | |
765 | + OP_MOUNT, | |
766 | + OP_UMOUNT, | |
767 | + | |
768 | OP_CREATE, | |
769 | OP_POST_CREATE, | |
770 | OP_BIND, | |
c2c0f25c | 771 | @@ -120,6 +124,13 @@ struct apparmor_audit_data { |
1e8b8f9b AM |
772 | unsigned long max; |
773 | } rlim; | |
774 | struct { | |
775 | + const char *src_name; | |
776 | + const char *type; | |
777 | + const char *trans; | |
778 | + const char *data; | |
779 | + unsigned long flags; | |
780 | + } mnt; | |
781 | + struct { | |
782 | const char *target; | |
783 | u32 request; | |
784 | u32 denied; | |
785 | diff --git a/security/apparmor/include/domain.h b/security/apparmor/include/domain.h | |
786 | index de04464..a3f70c5 100644 | |
787 | --- a/security/apparmor/include/domain.h | |
788 | +++ b/security/apparmor/include/domain.h | |
789 | @@ -23,6 +23,8 @@ struct aa_domain { | |
790 | char **table; | |
791 | }; | |
792 | ||
793 | +struct aa_profile *x_table_lookup(struct aa_profile *profile, u32 xindex); | |
794 | + | |
795 | int apparmor_bprm_set_creds(struct linux_binprm *bprm); | |
796 | int apparmor_bprm_secureexec(struct linux_binprm *bprm); | |
797 | void apparmor_bprm_committing_creds(struct linux_binprm *bprm); | |
798 | diff --git a/security/apparmor/include/mount.h b/security/apparmor/include/mount.h | |
ceaf2cfb | 799 | new file mode 100644 |
1e8b8f9b | 800 | index 0000000..bc17a53 |
ceaf2cfb | 801 | --- /dev/null |
1e8b8f9b AM |
802 | +++ b/security/apparmor/include/mount.h |
803 | @@ -0,0 +1,54 @@ | |
2380c486 | 804 | +/* |
9474138d AM |
805 | + * AppArmor security module |
806 | + * | |
1e8b8f9b | 807 | + * This file contains AppArmor file mediation function definitions. |
2380c486 | 808 | + * |
1e8b8f9b | 809 | + * Copyright 2012 Canonical Ltd. |
2380c486 | 810 | + * |
9474138d AM |
811 | + * This program is free software; you can redistribute it and/or |
812 | + * modify it under the terms of the GNU General Public License as | |
813 | + * published by the Free Software Foundation, version 2 of the | |
814 | + * License. | |
2380c486 JR |
815 | + */ |
816 | + | |
1e8b8f9b AM |
817 | +#ifndef __AA_MOUNT_H |
818 | +#define __AA_MOUNT_H | |
fc63ffa9 | 819 | + |
1e8b8f9b AM |
820 | +#include <linux/fs.h> |
821 | +#include <linux/path.h> | |
2380c486 | 822 | + |
1e8b8f9b AM |
823 | +#include "domain.h" |
824 | +#include "policy.h" | |
76514441 | 825 | + |
1e8b8f9b AM |
826 | +/* mount perms */ |
827 | +#define AA_MAY_PIVOTROOT 0x01 | |
828 | +#define AA_MAY_MOUNT 0x02 | |
829 | +#define AA_MAY_UMOUNT 0x04 | |
830 | +#define AA_AUDIT_DATA 0x40 | |
831 | +#define AA_CONT_MATCH 0x40 | |
fc63ffa9 | 832 | + |
1e8b8f9b | 833 | +#define AA_MS_IGNORE_MASK (MS_KERNMOUNT | MS_NOSEC | MS_ACTIVE | MS_BORN) |
fc63ffa9 | 834 | + |
1e8b8f9b AM |
835 | +int aa_remount(struct aa_profile *profile, struct path *path, |
836 | + unsigned long flags, void *data); | |
fc63ffa9 | 837 | + |
1e8b8f9b AM |
838 | +int aa_bind_mount(struct aa_profile *profile, struct path *path, |
839 | + const char *old_name, unsigned long flags); | |
fc63ffa9 | 840 | + |
fc63ffa9 | 841 | + |
1e8b8f9b AM |
842 | +int aa_mount_change_type(struct aa_profile *profile, struct path *path, |
843 | + unsigned long flags); | |
fc63ffa9 | 844 | + |
1e8b8f9b AM |
845 | +int aa_move_mount(struct aa_profile *profile, struct path *path, |
846 | + const char *old_name); | |
847 | + | |
848 | +int aa_new_mount(struct aa_profile *profile, const char *dev_name, | |
849 | + struct path *path, const char *type, unsigned long flags, | |
850 | + void *data); | |
851 | + | |
852 | +int aa_umount(struct aa_profile *profile, struct vfsmount *mnt, int flags); | |
853 | + | |
854 | +int aa_pivotroot(struct aa_profile *profile, struct path *old_path, | |
855 | + struct path *new_path); | |
856 | + | |
857 | +#endif /* __AA_MOUNT_H */ | |
858 | diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c | |
c2c0f25c | 859 | index 47fd244..fb92441 100644 |
1e8b8f9b AM |
860 | --- a/security/apparmor/lsm.c |
861 | +++ b/security/apparmor/lsm.c | |
862 | @@ -36,6 +36,7 @@ | |
863 | #include "include/path.h" | |
864 | #include "include/policy.h" | |
865 | #include "include/procattr.h" | |
866 | +#include "include/mount.h" | |
867 | ||
868 | /* Flag indicating whether initialization completed */ | |
869 | int apparmor_initialized __initdata; | |
c2c0f25c | 870 | @@ -492,6 +493,60 @@ static int apparmor_file_mprotect(struct vm_area_struct *vma, |
1e8b8f9b AM |
871 | !(vma->vm_flags & VM_SHARED) ? MAP_PRIVATE : 0); |
872 | } | |
873 | ||
68d1518e | 874 | +static int apparmor_sb_mount(const char *dev_name, struct path *path, const char *type, |
1e8b8f9b | 875 | + unsigned long flags, void *data) |
2380c486 | 876 | +{ |
1e8b8f9b AM |
877 | + struct aa_profile *profile; |
878 | + int error = 0; | |
76514441 | 879 | + |
1e8b8f9b AM |
880 | + /* Discard magic */ |
881 | + if ((flags & MS_MGC_MSK) == MS_MGC_VAL) | |
882 | + flags &= ~MS_MGC_MSK; | |
2380c486 | 883 | + |
1e8b8f9b AM |
884 | + flags &= ~AA_MS_IGNORE_MASK; |
885 | + | |
886 | + profile = __aa_current_profile(); | |
887 | + if (!unconfined(profile)) { | |
888 | + if (flags & MS_REMOUNT) | |
889 | + error = aa_remount(profile, path, flags, data); | |
890 | + else if (flags & MS_BIND) | |
891 | + error = aa_bind_mount(profile, path, dev_name, flags); | |
892 | + else if (flags & (MS_SHARED | MS_PRIVATE | MS_SLAVE | | |
893 | + MS_UNBINDABLE)) | |
894 | + error = aa_mount_change_type(profile, path, flags); | |
895 | + else if (flags & MS_MOVE) | |
896 | + error = aa_move_mount(profile, path, dev_name); | |
897 | + else | |
898 | + error = aa_new_mount(profile, dev_name, path, type, | |
899 | + flags, data); | |
2380c486 | 900 | + } |
1e8b8f9b AM |
901 | + return error; |
902 | +} | |
2380c486 | 903 | + |
1e8b8f9b AM |
904 | +static int apparmor_sb_umount(struct vfsmount *mnt, int flags) |
905 | +{ | |
906 | + struct aa_profile *profile; | |
907 | + int error = 0; | |
908 | + | |
909 | + profile = __aa_current_profile(); | |
910 | + if (!unconfined(profile)) | |
911 | + error = aa_umount(profile, mnt, flags); | |
912 | + | |
913 | + return error; | |
2380c486 JR |
914 | +} |
915 | + | |
1e8b8f9b | 916 | +static int apparmor_sb_pivotroot(struct path *old_path, struct path *new_path) |
2380c486 | 917 | +{ |
1e8b8f9b AM |
918 | + struct aa_profile *profile; |
919 | + int error = 0; | |
920 | + | |
921 | + profile = __aa_current_profile(); | |
922 | + if (!unconfined(profile)) | |
923 | + error = aa_pivotroot(profile, old_path, new_path); | |
924 | + | |
925 | + return error; | |
2380c486 JR |
926 | +} |
927 | + | |
1e8b8f9b AM |
928 | static int apparmor_getprocattr(struct task_struct *task, char *name, |
929 | char **value) | |
930 | { | |
c2c0f25c AM |
931 | @@ -710,6 +765,10 @@ static struct security_hook_list apparmor_hooks[] = { |
932 | LSM_HOOK_INIT(capget, apparmor_capget), | |
933 | LSM_HOOK_INIT(capable, apparmor_capable), | |
1e8b8f9b | 934 | |
c2c0f25c AM |
935 | + LSM_HOOK_INIT(sb_mount, apparmor_sb_mount), |
936 | + LSM_HOOK_INIT(sb_umount, apparmor_sb_umount), | |
937 | + LSM_HOOK_INIT(sb_pivotroot, apparmor_sb_pivotroot), | |
938 | + | |
939 | LSM_HOOK_INIT(path_link, apparmor_path_link), | |
940 | LSM_HOOK_INIT(path_unlink, apparmor_path_unlink), | |
941 | LSM_HOOK_INIT(path_symlink, apparmor_path_symlink), | |
1e8b8f9b AM |
942 | diff --git a/security/apparmor/mount.c b/security/apparmor/mount.c |
943 | new file mode 100644 | |
2dfbb274 | 944 | index 0000000..478aa4d |
1e8b8f9b AM |
945 | --- /dev/null |
946 | +++ b/security/apparmor/mount.c | |
947 | @@ -0,0 +1,620 @@ | |
948 | +/* | |
949 | + * AppArmor security module | |
fc63ffa9 | 950 | + * |
1e8b8f9b | 951 | + * This file contains AppArmor mediation of files |
ceaf2cfb | 952 | + * |
1e8b8f9b AM |
953 | + * Copyright (C) 1998-2008 Novell/SUSE |
954 | + * Copyright 2009-2012 Canonical Ltd. | |
955 | + * | |
956 | + * This program is free software; you can redistribute it and/or | |
957 | + * modify it under the terms of the GNU General Public License as | |
958 | + * published by the Free Software Foundation, version 2 of the | |
959 | + * License. | |
ceaf2cfb | 960 | + */ |
2380c486 | 961 | + |
1e8b8f9b AM |
962 | +#include <linux/fs.h> |
963 | +#include <linux/mount.h> | |
964 | +#include <linux/namei.h> | |
2380c486 | 965 | + |
1e8b8f9b AM |
966 | +#include "include/apparmor.h" |
967 | +#include "include/audit.h" | |
968 | +#include "include/context.h" | |
969 | +#include "include/domain.h" | |
970 | +#include "include/file.h" | |
971 | +#include "include/match.h" | |
972 | +#include "include/mount.h" | |
973 | +#include "include/path.h" | |
974 | +#include "include/policy.h" | |
ceaf2cfb | 975 | + |
2380c486 | 976 | + |
1e8b8f9b AM |
977 | +static void audit_mnt_flags(struct audit_buffer *ab, unsigned long flags) |
978 | +{ | |
979 | + if (flags & MS_RDONLY) | |
980 | + audit_log_format(ab, "ro"); | |
981 | + else | |
982 | + audit_log_format(ab, "rw"); | |
983 | + if (flags & MS_NOSUID) | |
984 | + audit_log_format(ab, ", nosuid"); | |
985 | + if (flags & MS_NODEV) | |
986 | + audit_log_format(ab, ", nodev"); | |
987 | + if (flags & MS_NOEXEC) | |
988 | + audit_log_format(ab, ", noexec"); | |
989 | + if (flags & MS_SYNCHRONOUS) | |
990 | + audit_log_format(ab, ", sync"); | |
991 | + if (flags & MS_REMOUNT) | |
992 | + audit_log_format(ab, ", remount"); | |
993 | + if (flags & MS_MANDLOCK) | |
994 | + audit_log_format(ab, ", mand"); | |
995 | + if (flags & MS_DIRSYNC) | |
996 | + audit_log_format(ab, ", dirsync"); | |
997 | + if (flags & MS_NOATIME) | |
998 | + audit_log_format(ab, ", noatime"); | |
999 | + if (flags & MS_NODIRATIME) | |
1000 | + audit_log_format(ab, ", nodiratime"); | |
1001 | + if (flags & MS_BIND) | |
1002 | + audit_log_format(ab, flags & MS_REC ? ", rbind" : ", bind"); | |
1003 | + if (flags & MS_MOVE) | |
1004 | + audit_log_format(ab, ", move"); | |
1005 | + if (flags & MS_SILENT) | |
1006 | + audit_log_format(ab, ", silent"); | |
1007 | + if (flags & MS_POSIXACL) | |
1008 | + audit_log_format(ab, ", acl"); | |
1009 | + if (flags & MS_UNBINDABLE) | |
1010 | + audit_log_format(ab, flags & MS_REC ? ", runbindable" : | |
1011 | + ", unbindable"); | |
1012 | + if (flags & MS_PRIVATE) | |
1013 | + audit_log_format(ab, flags & MS_REC ? ", rprivate" : | |
1014 | + ", private"); | |
1015 | + if (flags & MS_SLAVE) | |
1016 | + audit_log_format(ab, flags & MS_REC ? ", rslave" : | |
1017 | + ", slave"); | |
1018 | + if (flags & MS_SHARED) | |
1019 | + audit_log_format(ab, flags & MS_REC ? ", rshared" : | |
1020 | + ", shared"); | |
1021 | + if (flags & MS_RELATIME) | |
1022 | + audit_log_format(ab, ", relatime"); | |
1023 | + if (flags & MS_I_VERSION) | |
1024 | + audit_log_format(ab, ", iversion"); | |
1025 | + if (flags & MS_STRICTATIME) | |
1026 | + audit_log_format(ab, ", strictatime"); | |
1027 | + if (flags & MS_NOUSER) | |
1028 | + audit_log_format(ab, ", nouser"); | |
2380c486 JR |
1029 | +} |
1030 | + | |
ceaf2cfb | 1031 | +/** |
1e8b8f9b AM |
1032 | + * audit_cb - call back for mount specific audit fields |
1033 | + * @ab: audit_buffer (NOT NULL) | |
1034 | + * @va: audit struct to audit values of (NOT NULL) | |
ceaf2cfb | 1035 | + */ |
1e8b8f9b | 1036 | +static void audit_cb(struct audit_buffer *ab, void *va) |
2380c486 | 1037 | +{ |
1e8b8f9b | 1038 | + struct common_audit_data *sa = va; |
9474138d | 1039 | + |
1e8b8f9b AM |
1040 | + if (sa->aad->mnt.type) { |
1041 | + audit_log_format(ab, " fstype="); | |
1042 | + audit_log_untrustedstring(ab, sa->aad->mnt.type); | |
1043 | + } | |
1044 | + if (sa->aad->mnt.src_name) { | |
1045 | + audit_log_format(ab, " srcname="); | |
1046 | + audit_log_untrustedstring(ab, sa->aad->mnt.src_name); | |
1047 | + } | |
1048 | + if (sa->aad->mnt.trans) { | |
1049 | + audit_log_format(ab, " trans="); | |
1050 | + audit_log_untrustedstring(ab, sa->aad->mnt.trans); | |
1051 | + } | |
1052 | + if (sa->aad->mnt.flags || sa->aad->op == OP_MOUNT) { | |
1053 | + audit_log_format(ab, " flags=\""); | |
1054 | + audit_mnt_flags(ab, sa->aad->mnt.flags); | |
1055 | + audit_log_format(ab, "\""); | |
1056 | + } | |
1057 | + if (sa->aad->mnt.data) { | |
1058 | + audit_log_format(ab, " options="); | |
1059 | + audit_log_untrustedstring(ab, sa->aad->mnt.data); | |
1060 | + } | |
9474138d | 1061 | +} |
2380c486 | 1062 | + |
fc63ffa9 | 1063 | +/** |
1e8b8f9b AM |
1064 | + * audit_mount - handle the auditing of mount operations |
1065 | + * @profile: the profile being enforced (NOT NULL) | |
1066 | + * @gfp: allocation flags | |
1067 | + * @op: operation being mediated (NOT NULL) | |
1068 | + * @name: name of object being mediated (MAYBE NULL) | |
1069 | + * @src_name: src_name of object being mediated (MAYBE_NULL) | |
1070 | + * @type: type of filesystem (MAYBE_NULL) | |
1071 | + * @trans: name of trans (MAYBE NULL) | |
1072 | + * @flags: filesystem idependent mount flags | |
1073 | + * @data: filesystem mount flags | |
1074 | + * @request: permissions requested | |
1075 | + * @perms: the permissions computed for the request (NOT NULL) | |
1076 | + * @info: extra information message (MAYBE NULL) | |
1077 | + * @error: 0 if operation allowed else failure error code | |
9474138d | 1078 | + * |
1e8b8f9b | 1079 | + * Returns: %0 or error on failure |
76514441 | 1080 | + */ |
1e8b8f9b AM |
1081 | +static int audit_mount(struct aa_profile *profile, gfp_t gfp, int op, |
1082 | + const char *name, const char *src_name, | |
1083 | + const char *type, const char *trans, | |
1084 | + unsigned long flags, const void *data, u32 request, | |
1085 | + struct file_perms *perms, const char *info, int error) | |
2380c486 | 1086 | +{ |
1e8b8f9b | 1087 | + int audit_type = AUDIT_APPARMOR_AUTO; |
2dfbb274 | 1088 | + struct common_audit_data sa = { }; |
1e8b8f9b | 1089 | + struct apparmor_audit_data aad = { }; |
9474138d | 1090 | + |
1e8b8f9b AM |
1091 | + if (likely(!error)) { |
1092 | + u32 mask = perms->audit; | |
9474138d | 1093 | + |
1e8b8f9b AM |
1094 | + if (unlikely(AUDIT_MODE(profile) == AUDIT_ALL)) |
1095 | + mask = 0xffff; | |
76514441 | 1096 | + |
1e8b8f9b AM |
1097 | + /* mask off perms that are not being force audited */ |
1098 | + request &= mask; | |
fc63ffa9 | 1099 | + |
1e8b8f9b AM |
1100 | + if (likely(!request)) |
1101 | + return 0; | |
1102 | + audit_type = AUDIT_APPARMOR_AUDIT; | |
1103 | + } else { | |
1104 | + /* only report permissions that were denied */ | |
1105 | + request = request & ~perms->allow; | |
1106 | + | |
1107 | + if (request & perms->kill) | |
1108 | + audit_type = AUDIT_APPARMOR_KILL; | |
1109 | + | |
1110 | + /* quiet known rejects, assumes quiet and kill do not overlap */ | |
1111 | + if ((request & perms->quiet) && | |
1112 | + AUDIT_MODE(profile) != AUDIT_NOQUIET && | |
1113 | + AUDIT_MODE(profile) != AUDIT_ALL) | |
1114 | + request &= ~perms->quiet; | |
1115 | + | |
1116 | + if (!request) | |
1117 | + return COMPLAIN_MODE(profile) ? | |
1118 | + complain_error(error) : error; | |
1119 | + } | |
1120 | + | |
0c3ec466 | 1121 | + sa.type = LSM_AUDIT_DATA_NONE; |
1e8b8f9b AM |
1122 | + sa.aad = &aad; |
1123 | + sa.aad->op = op; | |
1124 | + sa.aad->name = name; | |
1125 | + sa.aad->mnt.src_name = src_name; | |
1126 | + sa.aad->mnt.type = type; | |
1127 | + sa.aad->mnt.trans = trans; | |
1128 | + sa.aad->mnt.flags = flags; | |
1129 | + if (data && (perms->audit & AA_AUDIT_DATA)) | |
1130 | + sa.aad->mnt.data = data; | |
1131 | + sa.aad->info = info; | |
1132 | + sa.aad->error = error; | |
1133 | + | |
1134 | + return aa_audit(audit_type, profile, gfp, &sa, audit_cb); | |
76514441 AM |
1135 | +} |
1136 | + | |
1137 | +/** | |
1e8b8f9b AM |
1138 | + * match_mnt_flags - Do an ordered match on mount flags |
1139 | + * @dfa: dfa to match against | |
1140 | + * @state: state to start in | |
1141 | + * @flags: mount flags to match against | |
76514441 | 1142 | + * |
1e8b8f9b AM |
1143 | + * Mount flags are encoded as an ordered match. This is done instead of |
1144 | + * checking against a simple bitmask, to allow for logical operations | |
1145 | + * on the flags. | |
76514441 | 1146 | + * |
1e8b8f9b | 1147 | + * Returns: next state after flags match |
76514441 | 1148 | + */ |
1e8b8f9b AM |
1149 | +static unsigned int match_mnt_flags(struct aa_dfa *dfa, unsigned int state, |
1150 | + unsigned long flags) | |
9474138d | 1151 | +{ |
1e8b8f9b | 1152 | + unsigned int i; |
fc63ffa9 | 1153 | + |
1e8b8f9b AM |
1154 | + for (i = 0; i <= 31 ; ++i) { |
1155 | + if ((1 << i) & flags) | |
1156 | + state = aa_dfa_next(dfa, state, i + 1); | |
1157 | + } | |
1158 | + | |
1159 | + return state; | |
9474138d AM |
1160 | +} |
1161 | + | |
1162 | +/** | |
1e8b8f9b AM |
1163 | + * compute_mnt_perms - compute mount permission associated with @state |
1164 | + * @dfa: dfa to match against (NOT NULL) | |
1165 | + * @state: state match finished in | |
ceaf2cfb | 1166 | + * |
1e8b8f9b | 1167 | + * Returns: mount permissions |
9474138d | 1168 | + */ |
1e8b8f9b AM |
1169 | +static struct file_perms compute_mnt_perms(struct aa_dfa *dfa, |
1170 | + unsigned int state) | |
9474138d | 1171 | +{ |
1e8b8f9b | 1172 | + struct file_perms perms; |
2380c486 | 1173 | + |
1e8b8f9b AM |
1174 | + perms.kill = 0; |
1175 | + perms.allow = dfa_user_allow(dfa, state); | |
1176 | + perms.audit = dfa_user_audit(dfa, state); | |
1177 | + perms.quiet = dfa_user_quiet(dfa, state); | |
1178 | + perms.xindex = dfa_user_xindex(dfa, state); | |
1179 | + | |
1180 | + return perms; | |
1181 | +} | |
1182 | + | |
1183 | +static const char const *mnt_info_table[] = { | |
1184 | + "match succeeded", | |
1185 | + "failed mntpnt match", | |
1186 | + "failed srcname match", | |
1187 | + "failed type match", | |
1188 | + "failed flags match", | |
1189 | + "failed data match" | |
1190 | +}; | |
1191 | + | |
1192 | +/* | |
1193 | + * Returns 0 on success else element that match failed in, this is the | |
1194 | + * index into the mnt_info_table above | |
1195 | + */ | |
1196 | +static int do_match_mnt(struct aa_dfa *dfa, unsigned int start, | |
1197 | + const char *mntpnt, const char *devname, | |
1198 | + const char *type, unsigned long flags, | |
1199 | + void *data, bool binary, struct file_perms *perms) | |
1200 | +{ | |
1201 | + unsigned int state; | |
1202 | + | |
1203 | + state = aa_dfa_match(dfa, start, mntpnt); | |
1204 | + state = aa_dfa_null_transition(dfa, state); | |
1205 | + if (!state) | |
1206 | + return 1; | |
1207 | + | |
1208 | + if (devname) | |
1209 | + state = aa_dfa_match(dfa, state, devname); | |
1210 | + state = aa_dfa_null_transition(dfa, state); | |
1211 | + if (!state) | |
1212 | + return 2; | |
1213 | + | |
1214 | + if (type) | |
1215 | + state = aa_dfa_match(dfa, state, type); | |
1216 | + state = aa_dfa_null_transition(dfa, state); | |
1217 | + if (!state) | |
1218 | + return 3; | |
1219 | + | |
1220 | + state = match_mnt_flags(dfa, state, flags); | |
1221 | + if (!state) | |
1222 | + return 4; | |
1223 | + *perms = compute_mnt_perms(dfa, state); | |
1224 | + if (perms->allow & AA_MAY_MOUNT) | |
1225 | + return 0; | |
1226 | + | |
1227 | + /* only match data if not binary and the DFA flags data is expected */ | |
1228 | + if (data && !binary && (perms->allow & AA_CONT_MATCH)) { | |
1229 | + state = aa_dfa_null_transition(dfa, state); | |
1230 | + if (!state) | |
1231 | + return 4; | |
1232 | + | |
1233 | + state = aa_dfa_match(dfa, state, data); | |
1234 | + if (!state) | |
1235 | + return 5; | |
1236 | + *perms = compute_mnt_perms(dfa, state); | |
1237 | + if (perms->allow & AA_MAY_MOUNT) | |
1238 | + return 0; | |
fc63ffa9 | 1239 | + } |
1e8b8f9b AM |
1240 | + |
1241 | + /* failed at end of flags match */ | |
1242 | + return 4; | |
9474138d AM |
1243 | +} |
1244 | + | |
ceaf2cfb | 1245 | +/** |
1e8b8f9b AM |
1246 | + * match_mnt - handle path matching for mount |
1247 | + * @profile: the confining profile | |
1248 | + * @mntpnt: string for the mntpnt (NOT NULL) | |
1249 | + * @devname: string for the devname/src_name (MAYBE NULL) | |
1250 | + * @type: string for the dev type (MAYBE NULL) | |
1251 | + * @flags: mount flags to match | |
1252 | + * @data: fs mount data (MAYBE NULL) | |
1253 | + * @binary: whether @data is binary | |
1254 | + * @perms: Returns: permission found by the match | |
1255 | + * @info: Returns: infomation string about the match for logging | |
fc63ffa9 | 1256 | + * |
1e8b8f9b | 1257 | + * Returns: 0 on success else error |
ceaf2cfb | 1258 | + */ |
1e8b8f9b AM |
1259 | +static int match_mnt(struct aa_profile *profile, const char *mntpnt, |
1260 | + const char *devname, const char *type, | |
1261 | + unsigned long flags, void *data, bool binary, | |
1262 | + struct file_perms *perms, const char **info) | |
9474138d | 1263 | +{ |
1e8b8f9b | 1264 | + int pos; |
2380c486 | 1265 | + |
1e8b8f9b AM |
1266 | + if (!profile->policy.dfa) |
1267 | + return -EACCES; | |
1268 | + | |
1269 | + pos = do_match_mnt(profile->policy.dfa, | |
1270 | + profile->policy.start[AA_CLASS_MOUNT], | |
1271 | + mntpnt, devname, type, flags, data, binary, perms); | |
1272 | + if (pos) { | |
1273 | + *info = mnt_info_table[pos]; | |
1274 | + return -EACCES; | |
1275 | + } | |
2380c486 | 1276 | + |
fc63ffa9 | 1277 | + return 0; |
9474138d | 1278 | +} |
9474138d | 1279 | + |
1e8b8f9b AM |
1280 | +static int path_flags(struct aa_profile *profile, struct path *path) |
1281 | +{ | |
1282 | + return profile->path_flags | | |
1283 | + S_ISDIR(path->dentry->d_inode->i_mode) ? PATH_IS_DIR : 0; | |
1284 | +} | |
9474138d | 1285 | + |
1e8b8f9b AM |
1286 | +int aa_remount(struct aa_profile *profile, struct path *path, |
1287 | + unsigned long flags, void *data) | |
9474138d | 1288 | +{ |
1e8b8f9b AM |
1289 | + struct file_perms perms = { }; |
1290 | + const char *name, *info = NULL; | |
1291 | + char *buffer = NULL; | |
1292 | + int binary, error; | |
1293 | + | |
1294 | + binary = path->dentry->d_sb->s_type->fs_flags & FS_BINARY_MOUNTDATA; | |
1295 | + | |
1296 | + error = aa_path_name(path, path_flags(profile, path), &buffer, &name, | |
1297 | + &info); | |
1298 | + if (error) | |
1299 | + goto audit; | |
1300 | + | |
1301 | + error = match_mnt(profile, name, NULL, NULL, flags, data, binary, | |
1302 | + &perms, &info); | |
1303 | + | |
1304 | +audit: | |
1305 | + error = audit_mount(profile, GFP_KERNEL, OP_MOUNT, name, NULL, NULL, | |
1306 | + NULL, flags, data, AA_MAY_MOUNT, &perms, info, | |
1307 | + error); | |
1308 | + kfree(buffer); | |
1309 | + | |
1310 | + return error; | |
9474138d AM |
1311 | +} |
1312 | + | |
1e8b8f9b AM |
1313 | +int aa_bind_mount(struct aa_profile *profile, struct path *path, |
1314 | + const char *dev_name, unsigned long flags) | |
9474138d | 1315 | +{ |
1e8b8f9b AM |
1316 | + struct file_perms perms = { }; |
1317 | + char *buffer = NULL, *old_buffer = NULL; | |
1318 | + const char *name, *old_name = NULL, *info = NULL; | |
1319 | + struct path old_path; | |
1320 | + int error; | |
1321 | + | |
1322 | + if (!dev_name || !*dev_name) | |
1323 | + return -EINVAL; | |
1324 | + | |
1325 | + flags &= MS_REC | MS_BIND; | |
1326 | + | |
1327 | + error = aa_path_name(path, path_flags(profile, path), &buffer, &name, | |
1328 | + &info); | |
1329 | + if (error) | |
1330 | + goto audit; | |
1331 | + | |
1332 | + error = kern_path(dev_name, LOOKUP_FOLLOW|LOOKUP_AUTOMOUNT, &old_path); | |
1333 | + if (error) | |
1334 | + goto audit; | |
1335 | + | |
1336 | + error = aa_path_name(&old_path, path_flags(profile, &old_path), | |
1337 | + &old_buffer, &old_name, &info); | |
1338 | + path_put(&old_path); | |
1339 | + if (error) | |
1340 | + goto audit; | |
1341 | + | |
1342 | + error = match_mnt(profile, name, old_name, NULL, flags, NULL, 0, | |
1343 | + &perms, &info); | |
1344 | + | |
1345 | +audit: | |
1346 | + error = audit_mount(profile, GFP_KERNEL, OP_MOUNT, name, old_name, | |
1347 | + NULL, NULL, flags, NULL, AA_MAY_MOUNT, &perms, | |
1348 | + info, error); | |
1349 | + kfree(buffer); | |
1350 | + kfree(old_buffer); | |
1351 | + | |
1352 | + return error; | |
9474138d | 1353 | +} |
fc63ffa9 | 1354 | + |
1e8b8f9b AM |
1355 | +int aa_mount_change_type(struct aa_profile *profile, struct path *path, |
1356 | + unsigned long flags) | |
1357 | +{ | |
1358 | + struct file_perms perms = { }; | |
1359 | + char *buffer = NULL; | |
1360 | + const char *name, *info = NULL; | |
1361 | + int error; | |
1362 | + | |
1363 | + /* These are the flags allowed by do_change_type() */ | |
1364 | + flags &= (MS_REC | MS_SILENT | MS_SHARED | MS_PRIVATE | MS_SLAVE | | |
1365 | + MS_UNBINDABLE); | |
1366 | + | |
1367 | + error = aa_path_name(path, path_flags(profile, path), &buffer, &name, | |
1368 | + &info); | |
fc63ffa9 | 1369 | + if (error) |
1e8b8f9b AM |
1370 | + goto audit; |
1371 | + | |
1372 | + error = match_mnt(profile, name, NULL, NULL, flags, NULL, 0, &perms, | |
1373 | + &info); | |
1374 | + | |
1375 | +audit: | |
1376 | + error = audit_mount(profile, GFP_KERNEL, OP_MOUNT, name, NULL, NULL, | |
1377 | + NULL, flags, NULL, AA_MAY_MOUNT, &perms, info, | |
1378 | + error); | |
1379 | + kfree(buffer); | |
1380 | + | |
1381 | + return error; | |
1382 | +} | |
1383 | + | |
1384 | +int aa_move_mount(struct aa_profile *profile, struct path *path, | |
1385 | + const char *orig_name) | |
1386 | +{ | |
1387 | + struct file_perms perms = { }; | |
1388 | + char *buffer = NULL, *old_buffer = NULL; | |
1389 | + const char *name, *old_name = NULL, *info = NULL; | |
1390 | + struct path old_path; | |
1391 | + int error; | |
1392 | + | |
1393 | + if (!orig_name || !*orig_name) | |
1394 | + return -EINVAL; | |
1395 | + | |
1396 | + error = aa_path_name(path, path_flags(profile, path), &buffer, &name, | |
1397 | + &info); | |
fc63ffa9 | 1398 | + if (error) |
1e8b8f9b AM |
1399 | + goto audit; |
1400 | + | |
1401 | + error = kern_path(orig_name, LOOKUP_FOLLOW, &old_path); | |
fc63ffa9 | 1402 | + if (error) |
1e8b8f9b AM |
1403 | + goto audit; |
1404 | + | |
1405 | + error = aa_path_name(&old_path, path_flags(profile, &old_path), | |
1406 | + &old_buffer, &old_name, &info); | |
1407 | + path_put(&old_path); | |
1408 | + if (error) | |
1409 | + goto audit; | |
1410 | + | |
1411 | + error = match_mnt(profile, name, old_name, NULL, MS_MOVE, NULL, 0, | |
1412 | + &perms, &info); | |
1413 | + | |
1414 | +audit: | |
1415 | + error = audit_mount(profile, GFP_KERNEL, OP_MOUNT, name, old_name, | |
1416 | + NULL, NULL, MS_MOVE, NULL, AA_MAY_MOUNT, &perms, | |
1417 | + info, error); | |
1418 | + kfree(buffer); | |
1419 | + kfree(old_buffer); | |
1420 | + | |
1421 | + return error; | |
1422 | +} | |
1423 | + | |
1424 | +int aa_new_mount(struct aa_profile *profile, const char *orig_dev_name, | |
1425 | + struct path *path, const char *type, unsigned long flags, | |
1426 | + void *data) | |
1427 | +{ | |
1428 | + struct file_perms perms = { }; | |
1429 | + char *buffer = NULL, *dev_buffer = NULL; | |
1430 | + const char *name = NULL, *dev_name = NULL, *info = NULL; | |
1431 | + int binary = 1; | |
1432 | + int error; | |
1433 | + | |
1434 | + dev_name = orig_dev_name; | |
1435 | + if (type) { | |
1436 | + int requires_dev; | |
1437 | + struct file_system_type *fstype = get_fs_type(type); | |
1438 | + if (!fstype) | |
1439 | + return -ENODEV; | |
1440 | + | |
1441 | + binary = fstype->fs_flags & FS_BINARY_MOUNTDATA; | |
1442 | + requires_dev = fstype->fs_flags & FS_REQUIRES_DEV; | |
1443 | + put_filesystem(fstype); | |
1444 | + | |
1445 | + if (requires_dev) { | |
1446 | + struct path dev_path; | |
1447 | + | |
1448 | + if (!dev_name || !*dev_name) { | |
1449 | + error = -ENOENT; | |
1450 | + goto out; | |
1451 | + } | |
1452 | + | |
1453 | + error = kern_path(dev_name, LOOKUP_FOLLOW, &dev_path); | |
1454 | + if (error) | |
1455 | + goto audit; | |
1456 | + | |
1457 | + error = aa_path_name(&dev_path, | |
1458 | + path_flags(profile, &dev_path), | |
1459 | + &dev_buffer, &dev_name, &info); | |
1460 | + path_put(&dev_path); | |
1461 | + if (error) | |
1462 | + goto audit; | |
1463 | + } | |
1464 | + } | |
1465 | + | |
1466 | + error = aa_path_name(path, path_flags(profile, path), &buffer, &name, | |
1467 | + &info); | |
1468 | + if (error) | |
1469 | + goto audit; | |
1470 | + | |
1471 | + error = match_mnt(profile, name, dev_name, type, flags, data, binary, | |
1472 | + &perms, &info); | |
1473 | + | |
1474 | +audit: | |
1475 | + error = audit_mount(profile, GFP_KERNEL, OP_MOUNT, name, dev_name, | |
1476 | + type, NULL, flags, data, AA_MAY_MOUNT, &perms, info, | |
1477 | + error); | |
1478 | + kfree(buffer); | |
1479 | + kfree(dev_buffer); | |
1480 | + | |
1481 | +out: | |
1482 | + return error; | |
1483 | + | |
1484 | +} | |
1485 | + | |
1486 | +int aa_umount(struct aa_profile *profile, struct vfsmount *mnt, int flags) | |
1487 | +{ | |
1488 | + struct file_perms perms = { }; | |
1489 | + char *buffer = NULL; | |
1490 | + const char *name, *info = NULL; | |
1491 | + int error; | |
1492 | + | |
1493 | + struct path path = { mnt, mnt->mnt_root }; | |
1494 | + error = aa_path_name(&path, path_flags(profile, &path), &buffer, &name, | |
1495 | + &info); | |
1496 | + if (error) | |
1497 | + goto audit; | |
1498 | + | |
1499 | + if (!error && profile->policy.dfa) { | |
1500 | + unsigned int state; | |
1501 | + state = aa_dfa_match(profile->policy.dfa, | |
1502 | + profile->policy.start[AA_CLASS_MOUNT], | |
1503 | + name); | |
1504 | + perms = compute_mnt_perms(profile->policy.dfa, state); | |
1505 | + } | |
1506 | + | |
1507 | + if (AA_MAY_UMOUNT & ~perms.allow) | |
1508 | + error = -EACCES; | |
1509 | + | |
1510 | +audit: | |
1511 | + error = audit_mount(profile, GFP_KERNEL, OP_UMOUNT, name, NULL, NULL, | |
1512 | + NULL, 0, NULL, AA_MAY_UMOUNT, &perms, info, error); | |
1513 | + kfree(buffer); | |
1514 | + | |
1515 | + return error; | |
1516 | +} | |
1517 | + | |
1518 | +int aa_pivotroot(struct aa_profile *profile, struct path *old_path, | |
1519 | + struct path *new_path) | |
1520 | +{ | |
1521 | + struct file_perms perms = { }; | |
1522 | + struct aa_profile *target = NULL; | |
1523 | + char *old_buffer = NULL, *new_buffer = NULL; | |
1524 | + const char *old_name, *new_name = NULL, *info = NULL; | |
1525 | + int error; | |
1526 | + | |
1527 | + error = aa_path_name(old_path, path_flags(profile, old_path), | |
1528 | + &old_buffer, &old_name, &info); | |
1529 | + if (error) | |
1530 | + goto audit; | |
1531 | + | |
1532 | + error = aa_path_name(new_path, path_flags(profile, new_path), | |
1533 | + &new_buffer, &new_name, &info); | |
1534 | + if (error) | |
1535 | + goto audit; | |
1536 | + | |
1537 | + if (profile->policy.dfa) { | |
1538 | + unsigned int state; | |
1539 | + state = aa_dfa_match(profile->policy.dfa, | |
1540 | + profile->policy.start[AA_CLASS_MOUNT], | |
1541 | + new_name); | |
1542 | + state = aa_dfa_null_transition(profile->policy.dfa, state); | |
1543 | + state = aa_dfa_match(profile->policy.dfa, state, old_name); | |
1544 | + perms = compute_mnt_perms(profile->policy.dfa, state); | |
1545 | + } | |
1546 | + | |
1547 | + if (AA_MAY_PIVOTROOT & perms.allow) { | |
1548 | + if ((perms.xindex & AA_X_TYPE_MASK) == AA_X_TABLE) { | |
1549 | + target = x_table_lookup(profile, perms.xindex); | |
1550 | + if (!target) | |
1551 | + error = -ENOENT; | |
1552 | + else | |
1553 | + error = aa_replace_current_profile(target); | |
1554 | + } | |
1555 | + } else | |
1556 | + error = -EACCES; | |
1557 | + | |
1558 | +audit: | |
1559 | + error = audit_mount(profile, GFP_KERNEL, OP_PIVOTROOT, new_name, | |
1560 | + old_name, NULL, target ? target->base.name : NULL, | |
1561 | + 0, NULL, AA_MAY_PIVOTROOT, &perms, info, error); | |
1562 | + aa_put_profile(target); | |
1563 | + kfree(old_buffer); | |
1564 | + kfree(new_buffer); | |
1565 | + | |
1566 | + return error; | |
1567 | +} | |
0fa3db16 | 1568 | -- |
c2c0f25c | 1569 | cgit v0.10.2 |
0fa3db16 | 1570 |