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apparmor: add per policy ns .load, .replace, .remove interface files 

Having per policy ns interface files helps with containers restoring
policy.

Signed-off-by: John Johansen <john.johansen@canonical.com>
This commit is contained in:
John Johansen 2017-01-16 00:42:58 -08:00
parent 12dd7171d6
commit b7fd2c0340
2 changed files with 130 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

146
security/apparmor/apparmorfs.c
View File

@ -117,7 +117,7 @@ static struct aa_loaddata *aa_simple_write_to_buffer(int op,
}
static ssize_t policy_update(int binop, const char __user *buf, size_t size,
loff_t *pos)
loff_t *pos, struct aa_ns *ns)
{
ssize_t error;
struct aa_loaddata *data;
@ -126,24 +126,29 @@ static ssize_t policy_update(int binop, const char __user *buf, size_t size,
/* high level check about policy management - fine grained in
* below after unpack
*/
error = aa_may_manage_policy(profile, profile->ns, op);
error = aa_may_manage_policy(profile, ns, op);
if (error)
return error;
data = aa_simple_write_to_buffer(op, buf, size, size, pos);
error = PTR_ERR(data);
if (!IS_ERR(data)) {
error = aa_replace_profiles(profile->ns, profile, binop, data);
error = aa_replace_profiles(ns ? ns : profile->ns, profile,
binop, data);
aa_put_loaddata(data);
}
return error;
}
/* .load file hook fn to load policy */
static ssize_t profile_load(struct file *f, const char __user *buf, size_t size,
loff_t *pos)
{
int error = policy_update(PROF_ADD, buf, size, pos);
struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
int error = policy_update(PROF_ADD, buf, size, pos, ns);
aa_put_ns(ns);
return error;
}
@ -157,7 +162,10 @@ static const struct file_operations aa_fs_profile_load = {
static ssize_t profile_replace(struct file *f, const char __user *buf,
size_t size, loff_t *pos)
{
int error = policy_update(PROF_REPLACE, buf, size, pos);
struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
int error = policy_update(PROF_REPLACE, buf, size, pos, ns);
aa_put_ns(ns);
return error;
}
@ -167,18 +175,20 @@ static const struct file_operations aa_fs_profile_replace = {
.llseek = default_llseek,
};
/* .remove file hook fn to remove loaded policy */
static ssize_t profile_remove(struct file *f, const char __user *buf,
size_t size, loff_t *pos)
{
struct aa_loaddata *data;
struct aa_profile *profile;
ssize_t error;
struct aa_ns *ns = aa_get_ns(f->f_inode->i_private);
profile = aa_current_profile();
/* high level check about policy management - fine grained in
* below after unpack
*/
error = aa_may_manage_policy(profile, profile->ns, OP_PROF_RM);
error = aa_may_manage_policy(profile, ns, OP_PROF_RM);
if (error)
goto out;
@ -192,11 +202,12 @@ static ssize_t profile_remove(struct file *f, const char __user *buf,
error = PTR_ERR(data);
if (!IS_ERR(data)) {
data->data[size] = 0;
error = aa_remove_profiles(profile->ns, profile, data->data,
size);
error = aa_remove_profiles(ns ? ns : profile->ns, profile,
data->data, size);
aa_put_loaddata(data);
}
out:
aa_put_ns(ns);
return error;
}
@ -676,12 +687,77 @@ void __aa_fs_ns_rmdir(struct aa_ns *ns)
mutex_unlock(&sub->lock);
}
if (ns_subns_dir(ns)) {
sub = d_inode(ns_subns_dir(ns))->i_private;
aa_put_ns(sub);
}
if (ns_subload(ns)) {
sub = d_inode(ns_subload(ns))->i_private;
aa_put_ns(sub);
}
if (ns_subreplace(ns)) {
sub = d_inode(ns_subreplace(ns))->i_private;
aa_put_ns(sub);
}
if (ns_subremove(ns)) {
sub = d_inode(ns_subremove(ns))->i_private;
aa_put_ns(sub);
}
for (i = AAFS_NS_SIZEOF - 1; i >= 0; --i) {
securityfs_remove(ns->dents[i]);
ns->dents[i] = NULL;
}
}
/* assumes cleanup in caller */
static int __aa_fs_ns_mkdir_entries(struct aa_ns *ns, struct dentry *dir)
{
struct dentry *dent;
AA_BUG(!ns);
AA_BUG(!dir);
dent = securityfs_create_dir("profiles", dir);
if (IS_ERR(dent))
return PTR_ERR(dent);
ns_subprofs_dir(ns) = dent;
dent = securityfs_create_dir("raw_data", dir);
if (IS_ERR(dent))
return PTR_ERR(dent);
ns_subdata_dir(ns) = dent;
dent = securityfs_create_file(".load", 0640, dir, ns,
&aa_fs_profile_load);
if (IS_ERR(dent))
return PTR_ERR(dent);
aa_get_ns(ns);
ns_subload(ns) = dent;
dent = securityfs_create_file(".replace", 0640, dir, ns,
&aa_fs_profile_replace);
if (IS_ERR(dent))
return PTR_ERR(dent);
aa_get_ns(ns);
ns_subreplace(ns) = dent;
dent = securityfs_create_file(".remove", 0640, dir, ns,
&aa_fs_profile_remove);
if (IS_ERR(dent))
return PTR_ERR(dent);
aa_get_ns(ns);
ns_subremove(ns) = dent;
dent = securityfs_create_dir("namespaces", dir);
if (IS_ERR(dent))
return PTR_ERR(dent);
aa_get_ns(ns);
ns_subns_dir(ns) = dent;
return 0;
}
int __aa_fs_ns_mkdir(struct aa_ns *ns, struct dentry *parent, const char *name)
{
struct aa_ns *sub;
@ -689,30 +765,31 @@ int __aa_fs_ns_mkdir(struct aa_ns *ns, struct dentry *parent, const char *name)
struct dentry *dent, *dir;
int error;
AA_BUG(!ns);
AA_BUG(!parent);
AA_BUG(!mutex_is_locked(&ns->lock));
if (!name)
name = ns->base.name;
/* create ns dir if it doesn't already exist */
dent = securityfs_create_dir(name, parent);
if (IS_ERR(dent))
goto fail;
ns_dir(ns) = dir = dent;
error = __aa_fs_ns_mkdir_entries(ns, dir);
if (error)
goto fail2;
dent = securityfs_create_dir("profiles", dir);
if (IS_ERR(dent))
goto fail;
ns_subprofs_dir(ns) = dent;
dent = securityfs_create_dir("namespaces", dir);
if (IS_ERR(dent))
goto fail;
ns_subns_dir(ns) = dent;
/* profiles */
list_for_each_entry(child, &ns->base.profiles, base.list) {
error = __aa_fs_profile_mkdir(child, ns_subprofs_dir(ns));
if (error)
goto fail2;
}
/* subnamespaces */
list_for_each_entry(sub, &ns->sub_ns, base.list) {
mutex_lock(&sub->lock);
error = __aa_fs_ns_mkdir(sub, ns_subns_dir(ns), NULL);
@ -1003,12 +1080,9 @@ static struct aa_fs_entry aa_fs_entry_features[] = {
};
static struct aa_fs_entry aa_fs_entry_apparmor[] = {
AA_FS_FILE_FOPS(".load", 0640, &aa_fs_profile_load),
AA_FS_FILE_FOPS(".replace", 0640, &aa_fs_profile_replace),
AA_FS_FILE_FOPS(".remove", 0640, &aa_fs_profile_remove),
AA_FS_FILE_FOPS(".ns_level", 0666, &aa_fs_ns_level),
AA_FS_FILE_FOPS(".ns_name", 0640, &aa_fs_ns_name),
AA_FS_FILE_FOPS("profiles", 0640, &aa_fs_profiles_fops),
AA_FS_FILE_FOPS("profiles", 0440, &aa_fs_profiles_fops),
AA_FS_DIR("features", aa_fs_entry_features),
{ }
};
@ -1172,6 +1246,7 @@ out:
*/
static int __init aa_create_aafs(void)
{
struct dentry *dent;
int error;
if (!apparmor_initialized)
@ -1187,7 +1262,34 @@ static int __init aa_create_aafs(void)
if (error)
goto error;
dent = securityfs_create_file(".load", 0666, aa_fs_entry.dentry,
NULL, &aa_fs_profile_load);
if (IS_ERR(dent)) {
error = PTR_ERR(dent);
goto error;
}
ns_subload(root_ns) = dent;
dent = securityfs_create_file(".replace", 0666, aa_fs_entry.dentry,
NULL, &aa_fs_profile_replace);
if (IS_ERR(dent)) {
error = PTR_ERR(dent);
goto error;
}
ns_subreplace(root_ns) = dent;
dent = securityfs_create_file(".remove", 0666, aa_fs_entry.dentry,
NULL, &aa_fs_profile_remove);
if (IS_ERR(dent)) {
error = PTR_ERR(dent);
goto error;
}
ns_subremove(root_ns) = dent;
mutex_lock(&root_ns->lock);
error = __aa_fs_ns_mkdir(root_ns, aa_fs_entry.dentry, "policy");
mutex_unlock(&root_ns->lock);
if (error)
goto error;

6
security/apparmor/include/apparmorfs.h
View File

@ -71,6 +71,9 @@ enum aafs_ns_type {
AAFS_NS_PROFS,
AAFS_NS_NS,
AAFS_NS_RAW_DATA,
AAFS_NS_LOAD,
AAFS_NS_REPLACE,
AAFS_NS_REMOVE,
AAFS_NS_COUNT,
AAFS_NS_MAX_COUNT,
AAFS_NS_SIZE,
@ -96,6 +99,9 @@ enum aafs_prof_type {
#define ns_subns_dir(X) ((X)->dents[AAFS_NS_NS])
#define ns_subprofs_dir(X) ((X)->dents[AAFS_NS_PROFS])
#define ns_subdata_dir(X) ((X)->dents[AAFS_NS_RAW_DATA])
#define ns_subload(X) ((X)->dents[AAFS_NS_LOAD])
#define ns_subreplace(X) ((X)->dents[AAFS_NS_REPLACE])
#define ns_subremove(X) ((X)->dents[AAFS_NS_REMOVE])
#define prof_dir(X) ((X)->dents[AAFS_PROF_DIR])
#define prof_child_dir(X) ((X)->dents[AAFS_PROF_PROFS])