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apparmor: Parse secmark policy

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Add support for parsing secmark policy provided by userspace, and
store that in the overall policy.

Signed-off-by: Matthew Garrett <mjg59@google.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
This commit is contained in:
Matthew Garrett 2018-05-24 13:27:46 -07:00 committed by John Johansen
parent 617a629c08
commit 9caafbe2b4
4 changed files with 77 additions and 0 deletions
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10
security/apparmor/include/net.h
View File

@ -83,6 +83,13 @@ struct aa_sk_ctx {
__e; \
})
struct aa_secmark {
u8 audit;
u8 deny;
u32 secid;
char *label;
};
extern struct aa_sfs_entry aa_sfs_entry_network[];
void audit_net_cb(struct audit_buffer *ab, void *va);
@ -103,4 +110,7 @@ int aa_sk_perm(const char *op, u32 request, struct sock *sk);
int aa_sock_file_perm(struct aa_label *label, const char *op, u32 request,
struct socket *sock);
int apparmor_secmark_check(struct aa_label *label, char *op, u32 request,
u32 secid, struct sock *sk);
#endif /* __AA_NET_H */

3
security/apparmor/include/policy.h
View File

@ -155,6 +155,9 @@ struct aa_profile {
struct aa_rlimit rlimits;
int secmark_count;
struct aa_secmark *secmark;
struct aa_loaddata *rawdata;
unsigned char *hash;
char *dirname;

3
security/apparmor/policy.c
View File

@ -231,6 +231,9 @@ void aa_free_profile(struct aa_profile *profile)
for (i = 0; i < profile->xattr_count; i++)
kzfree(profile->xattrs[i]);
kzfree(profile->xattrs);
for (i=0; i < profile->secmark_count; i++)
kzfree(profile->secmark[i].label);
kzfree(profile->secmark);
kzfree(profile->dirname);
aa_put_dfa(profile->xmatch);
aa_put_dfa(profile->policy.dfa);

61
security/apparmor/policy_unpack.c
View File

@ -292,6 +292,19 @@ static bool unpack_nameX(struct aa_ext *e, enum aa_code code, const char *name)
return 0;
}
static bool unpack_u8(struct aa_ext *e, u8 *data, const char *name)
{
if (unpack_nameX(e, AA_U8, name)) {
if (!inbounds(e, sizeof(u8)))
return 0;
if (data)
*data = get_unaligned((u8 *)e->pos);
e->pos += sizeof(u8);
return 1;
}
return 0;
}
static bool unpack_u32(struct aa_ext *e, u32 *data, const char *name)
{
if (unpack_nameX(e, AA_U32, name)) {
@ -529,6 +542,49 @@ static bool unpack_xattrs(struct aa_ext *e, struct aa_profile *profile)
return 0;
}
static bool unpack_secmark(struct aa_ext *e, struct aa_profile *profile)
{
void *pos = e->pos;
int i, size;
if (unpack_nameX(e, AA_STRUCT, "secmark")) {
size = unpack_array(e, NULL);
profile->secmark = kcalloc(size, sizeof(struct aa_secmark),
GFP_KERNEL);
if (!profile->secmark)
goto fail;
profile->secmark_count = size;
for (i = 0; i < size; i++) {
if (!unpack_u8(e, &profile->secmark[i].audit, NULL))
goto fail;
if (!unpack_u8(e, &profile->secmark[i].deny, NULL))
goto fail;
if (!unpack_strdup(e, &profile->secmark[i].label, NULL))
goto fail;
}
if (!unpack_nameX(e, AA_ARRAYEND, NULL))
goto fail;
if (!unpack_nameX(e, AA_STRUCTEND, NULL))
goto fail;
}
return 1;
fail:
if (profile->secmark) {
for (i = 0; i < size; i++)
kfree(profile->secmark[i].label);
kfree(profile->secmark);
profile->secmark_count = 0;
}
e->pos = pos;
return 0;
}
static bool unpack_rlimits(struct aa_ext *e, struct aa_profile *profile)
{
void *pos = e->pos;
@ -727,6 +783,11 @@ static struct aa_profile *unpack_profile(struct aa_ext *e, char **ns_name)
goto fail;
}
if (!unpack_secmark(e, profile)) {
info = "failed to unpack profile secmark rules";
goto fail;
}
if (unpack_nameX(e, AA_STRUCT, "policydb")) {
/* generic policy dfa - optional and may be NULL */
info = "failed to unpack policydb";