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nexedi
linux
Commits
aa9aeea8
Commit
aa9aeea8
authored
May 29, 2017
by
John Johansen
Browse files
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Plain Diff
apparmor: add gerneric permissions struct and support fns
Signed-off-by:
John Johansen
<
john.johansen@canonical.com
>
parent
b5b2557c
Changes
4
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Showing
4 changed files
with
153 additions
and
17 deletions
+153
-17
security/apparmor/file.c
security/apparmor/file.c
+15
-15
security/apparmor/include/audit.h
security/apparmor/include/audit.h
+2
-2
security/apparmor/include/perms.h
security/apparmor/include/perms.h
+34
-0
security/apparmor/lib.c
security/apparmor/lib.c
+102
-0
No files found.
security/apparmor/file.c
View file @
aa9aeea8
...
...
@@ -56,15 +56,15 @@ static void file_audit_cb(struct audit_buffer *ab, void *va)
struct
common_audit_data
*
sa
=
va
;
kuid_t
fsuid
=
current_fsuid
();
if
(
aad
(
sa
)
->
fs
.
request
&
AA_AUDIT_FILE_MASK
)
{
if
(
aad
(
sa
)
->
request
&
AA_AUDIT_FILE_MASK
)
{
audit_log_format
(
ab
,
" requested_mask="
);
audit_file_mask
(
ab
,
aad
(
sa
)
->
fs
.
request
);
audit_file_mask
(
ab
,
aad
(
sa
)
->
request
);
}
if
(
aad
(
sa
)
->
fs
.
denied
&
AA_AUDIT_FILE_MASK
)
{
if
(
aad
(
sa
)
->
denied
&
AA_AUDIT_FILE_MASK
)
{
audit_log_format
(
ab
,
" denied_mask="
);
audit_file_mask
(
ab
,
aad
(
sa
)
->
fs
.
denied
);
audit_file_mask
(
ab
,
aad
(
sa
)
->
denied
);
}
if
(
aad
(
sa
)
->
fs
.
request
&
AA_AUDIT_FILE_MASK
)
{
if
(
aad
(
sa
)
->
request
&
AA_AUDIT_FILE_MASK
)
{
audit_log_format
(
ab
,
" fsuid=%d"
,
from_kuid
(
&
init_user_ns
,
fsuid
));
audit_log_format
(
ab
,
" ouid=%d"
,
...
...
@@ -100,7 +100,7 @@ int aa_audit_file(struct aa_profile *profile, struct file_perms *perms,
DEFINE_AUDIT_DATA
(
sa
,
LSM_AUDIT_DATA_TASK
,
op
);
sa
.
u
.
tsk
=
NULL
;
aad
(
&
sa
)
->
fs
.
request
=
request
;
aad
(
&
sa
)
->
request
=
request
;
aad
(
&
sa
)
->
name
=
name
;
aad
(
&
sa
)
->
fs
.
target
=
target
;
aad
(
&
sa
)
->
fs
.
ouid
=
ouid
;
...
...
@@ -115,30 +115,30 @@ int aa_audit_file(struct aa_profile *profile, struct file_perms *perms,
mask
=
0xffff
;
/* mask off perms that are not being force audited */
aad
(
&
sa
)
->
fs
.
request
&=
mask
;
aad
(
&
sa
)
->
request
&=
mask
;
if
(
likely
(
!
aad
(
&
sa
)
->
fs
.
request
))
if
(
likely
(
!
aad
(
&
sa
)
->
request
))
return
0
;
type
=
AUDIT_APPARMOR_AUDIT
;
}
else
{
/* only report permissions that were denied */
aad
(
&
sa
)
->
fs
.
request
=
aad
(
&
sa
)
->
fs
.
request
&
~
perms
->
allow
;
AA_BUG
(
!
aad
(
&
sa
)
->
fs
.
request
);
aad
(
&
sa
)
->
request
=
aad
(
&
sa
)
->
request
&
~
perms
->
allow
;
AA_BUG
(
!
aad
(
&
sa
)
->
request
);
if
(
aad
(
&
sa
)
->
fs
.
request
&
perms
->
kill
)
if
(
aad
(
&
sa
)
->
request
&
perms
->
kill
)
type
=
AUDIT_APPARMOR_KILL
;
/* quiet known rejects, assumes quiet and kill do not overlap */
if
((
aad
(
&
sa
)
->
fs
.
request
&
perms
->
quiet
)
&&
if
((
aad
(
&
sa
)
->
request
&
perms
->
quiet
)
&&
AUDIT_MODE
(
profile
)
!=
AUDIT_NOQUIET
&&
AUDIT_MODE
(
profile
)
!=
AUDIT_ALL
)
aad
(
&
sa
)
->
fs
.
request
&=
~
perms
->
quiet
;
aad
(
&
sa
)
->
request
&=
~
perms
->
quiet
;
if
(
!
aad
(
&
sa
)
->
fs
.
request
)
if
(
!
aad
(
&
sa
)
->
request
)
return
COMPLAIN_MODE
(
profile
)
?
0
:
aad
(
&
sa
)
->
error
;
}
aad
(
&
sa
)
->
fs
.
denied
=
aad
(
&
sa
)
->
fs
.
request
&
~
perms
->
allow
;
aad
(
&
sa
)
->
denied
=
aad
(
&
sa
)
->
request
&
~
perms
->
allow
;
return
aa_audit
(
type
,
profile
,
&
sa
,
file_audit_cb
);
}
...
...
security/apparmor/include/audit.h
View file @
aa9aeea8
...
...
@@ -107,14 +107,14 @@ struct apparmor_audit_data {
void
*
profile
;
const
char
*
name
;
const
char
*
info
;
u32
request
;
u32
denied
;
union
{
/* these entries require a custom callback fn */
struct
{
struct
aa_profile
*
peer
;
struct
{
const
char
*
target
;
u32
request
;
u32
denied
;
kuid_t
ouid
;
}
fs
;
};
...
...
security/apparmor/include/perms.h
View file @
aa9aeea8
...
...
@@ -66,6 +66,40 @@
extern
const
char
aa_file_perm_chrs
[];
extern
const
char
*
aa_file_perm_names
[];
struct
aa_perms
{
u32
allow
;
u32
audit
;
/* set only when allow is set */
u32
deny
;
/* explicit deny, or conflict if allow also set */
u32
quiet
;
/* set only when ~allow | deny */
u32
kill
;
/* set only when ~allow | deny */
u32
stop
;
/* set only when ~allow | deny */
u32
complain
;
/* accumulates only used when ~allow & ~deny */
u32
cond
;
/* set only when ~allow and ~deny */
u32
hide
;
/* set only when ~allow | deny */
u32
prompt
;
/* accumulates only used when ~allow & ~deny */
/* Reserved:
* u32 subtree; / * set only when allow is set * /
*/
u16
xindex
;
};
#define ALL_PERMS_MASK 0xffffffff
extern
struct
aa_perms
allperms
;
struct
aa_profile
;
void
aa_perm_mask_to_str
(
char
*
str
,
const
char
*
chrs
,
u32
mask
);
void
aa_audit_perm_names
(
struct
audit_buffer
*
ab
,
const
char
**
names
,
u32
mask
);
void
aa_audit_perm_mask
(
struct
audit_buffer
*
ab
,
u32
mask
,
const
char
*
chrs
,
u32
chrsmask
,
const
char
**
names
,
u32
namesmask
);
void
aa_apply_modes_to_perms
(
struct
aa_profile
*
profile
,
struct
aa_perms
*
perms
);
void
aa_compute_perms
(
struct
aa_dfa
*
dfa
,
unsigned
int
state
,
struct
aa_perms
*
perms
);
#endif
/* __AA_PERM_H */
security/apparmor/lib.c
View file @
aa9aeea8
...
...
@@ -24,6 +24,10 @@
#include "include/perms.h"
#include "include/policy.h"
struct
aa_perms
allperms
=
{
.
allow
=
ALL_PERMS_MASK
,
.
quiet
=
ALL_PERMS_MASK
,
.
hide
=
ALL_PERMS_MASK
};
/**
* aa_split_fqname - split a fqname into a profile and namespace name
* @fqname: a full qualified name in namespace profile format (NOT NULL)
...
...
@@ -188,6 +192,104 @@ void aa_perm_mask_to_str(char *str, const char *chrs, u32 mask)
*
str
=
'\0'
;
}
void
aa_audit_perm_names
(
struct
audit_buffer
*
ab
,
const
char
**
names
,
u32
mask
)
{
const
char
*
fmt
=
"%s"
;
unsigned
int
i
,
perm
=
1
;
bool
prev
=
false
;
for
(
i
=
0
;
i
<
32
;
perm
<<=
1
,
i
++
)
{
if
(
mask
&
perm
)
{
audit_log_format
(
ab
,
fmt
,
names
[
i
]);
if
(
!
prev
)
{
prev
=
true
;
fmt
=
" %s"
;
}
}
}
}
void
aa_audit_perm_mask
(
struct
audit_buffer
*
ab
,
u32
mask
,
const
char
*
chrs
,
u32
chrsmask
,
const
char
**
names
,
u32
namesmask
)
{
char
str
[
33
];
audit_log_format
(
ab
,
"
\"
"
);
if
((
mask
&
chrsmask
)
&&
chrs
)
{
aa_perm_mask_to_str
(
str
,
chrs
,
mask
&
chrsmask
);
mask
&=
~
chrsmask
;
audit_log_format
(
ab
,
"%s"
,
str
);
if
(
mask
&
namesmask
)
audit_log_format
(
ab
,
" "
);
}
if
((
mask
&
namesmask
)
&&
names
)
aa_audit_perm_names
(
ab
,
names
,
mask
&
namesmask
);
audit_log_format
(
ab
,
"
\"
"
);
}
/**
* aa_apply_modes_to_perms - apply namespace and profile flags to perms
* @profile: that perms where computed from
* @perms: perms to apply mode modifiers to
*
* TODO: split into profile and ns based flags for when accumulating perms
*/
void
aa_apply_modes_to_perms
(
struct
aa_profile
*
profile
,
struct
aa_perms
*
perms
)
{
switch
(
AUDIT_MODE
(
profile
))
{
case
AUDIT_ALL
:
perms
->
audit
=
ALL_PERMS_MASK
;
/* fall through */
case
AUDIT_NOQUIET
:
perms
->
quiet
=
0
;
break
;
case
AUDIT_QUIET
:
perms
->
audit
=
0
;
/* fall through */
case
AUDIT_QUIET_DENIED
:
perms
->
quiet
=
ALL_PERMS_MASK
;
break
;
}
if
(
KILL_MODE
(
profile
))
perms
->
kill
=
ALL_PERMS_MASK
;
else
if
(
COMPLAIN_MODE
(
profile
))
perms
->
complain
=
ALL_PERMS_MASK
;
/*
* TODO:
* else if (PROMPT_MODE(profile))
* perms->prompt = ALL_PERMS_MASK;
*/
}
static
u32
map_other
(
u32
x
)
{
return
((
x
&
0x3
)
<<
8
)
|
/* SETATTR/GETATTR */
((
x
&
0x1c
)
<<
18
)
|
/* ACCEPT/BIND/LISTEN */
((
x
&
0x60
)
<<
19
);
/* SETOPT/GETOPT */
}
void
aa_compute_perms
(
struct
aa_dfa
*
dfa
,
unsigned
int
state
,
struct
aa_perms
*
perms
)
{
perms
->
deny
=
0
;
perms
->
kill
=
perms
->
stop
=
0
;
perms
->
complain
=
perms
->
cond
=
0
;
perms
->
hide
=
0
;
perms
->
prompt
=
0
;
perms
->
allow
=
dfa_user_allow
(
dfa
,
state
);
perms
->
audit
=
dfa_user_audit
(
dfa
,
state
);
perms
->
quiet
=
dfa_user_quiet
(
dfa
,
state
);
/* for v5 perm mapping in the policydb, the other set is used
* to extend the general perm set
*/
perms
->
allow
|=
map_other
(
dfa_other_allow
(
dfa
,
state
));
perms
->
audit
|=
map_other
(
dfa_other_audit
(
dfa
,
state
));
perms
->
quiet
|=
map_other
(
dfa_other_quiet
(
dfa
,
state
));
// perms->xindex = dfa_user_xindex(dfa, state);
}
/**
* aa_policy_init - initialize a policy structure
* @policy: policy to initialize (NOT NULL)
...
...
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