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apparmor: update policy capable checks to use a label 

Previously the policy capable checks assumed they were using the
current task. Make them take the task label so the query can be
made against an arbitrary task.

Signed-off-by: John Johansen <john.johansen@canonical.com>
This commit is contained in:
John Johansen 2020-06-30 17:00:11 -07:00
parent 5268d795d6
commit 92de220a7f
5 changed files with 51 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
security/apparmor/apparmorfs.c
View File

@ -1357,7 +1357,7 @@ static int rawdata_open(struct inode *inode, struct file *file)
struct aa_loaddata *loaddata;
struct rawdata_f_data *private;
if (!policy_view_capable(NULL))
if (!aa_current_policy_view_capable(NULL))
return -EACCES;
loaddata = __aa_get_loaddata(inode->i_private);
@ -2266,7 +2266,7 @@ static const struct seq_operations aa_sfs_profiles_op = {
static int profiles_open(struct inode *inode, struct file *file)
{
if (!policy_view_capable(NULL))
if (!aa_current_policy_view_capable(NULL))
return -EACCES;
return seq_open(file, &aa_sfs_profiles_op);

1
security/apparmor/include/label.h
View File

@ -148,6 +148,7 @@ do { \
#define __label_make_stale(X) ((X)->flags |= FLAG_STALE)
#define labels_ns(X) (vec_ns(&((X)->vec[0]), (X)->size))
#define labels_set(X) (&labels_ns(X)->labels)
#define labels_view(X) labels_ns(X)
#define labels_profile(X) ((X)->vec[(X)->size - 1])

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

@ -301,9 +301,11 @@ static inline int AUDIT_MODE(struct aa_profile *profile)
return profile->audit;
}
bool policy_view_capable(struct aa_ns *ns);
bool policy_admin_capable(struct aa_ns *ns);
bool aa_policy_view_capable(struct aa_label *label, struct aa_ns *ns);
bool aa_policy_admin_capable(struct aa_label *label, struct aa_ns *ns);
int aa_may_manage_policy(struct aa_label *label, struct aa_ns *ns,
u32 mask);
bool aa_current_policy_view_capable(struct aa_ns *ns);
bool aa_current_policy_admin_capable(struct aa_ns *ns);
#endif /* __AA_POLICY_H */

22
security/apparmor/lsm.c
View File

@ -1392,7 +1392,7 @@ static int param_set_aalockpolicy(const char *val, const struct kernel_param *kp
{
if (!apparmor_enabled)
return -EINVAL;
if (apparmor_initialized && !policy_admin_capable(NULL))
if (apparmor_initialized && !aa_current_policy_admin_capable(NULL))
return -EPERM;
return param_set_bool(val, kp);
}
@ -1401,7 +1401,7 @@ static int param_get_aalockpolicy(char *buffer, const struct kernel_param *kp)
{
if (!apparmor_enabled)
return -EINVAL;
if (apparmor_initialized && !policy_view_capable(NULL))
if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
return -EPERM;
return param_get_bool(buffer, kp);
}
@ -1410,7 +1410,7 @@ static int param_set_aabool(const char *val, const struct kernel_param *kp)
{
if (!apparmor_enabled)
return -EINVAL;
if (apparmor_initialized && !policy_admin_capable(NULL))
if (apparmor_initialized && !aa_current_policy_admin_capable(NULL))
return -EPERM;
return param_set_bool(val, kp);
}
@ -1419,7 +1419,7 @@ static int param_get_aabool(char *buffer, const struct kernel_param *kp)
{
if (!apparmor_enabled)
return -EINVAL;
if (apparmor_initialized && !policy_view_capable(NULL))
if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
return -EPERM;
return param_get_bool(buffer, kp);
}
@ -1445,7 +1445,7 @@ static int param_get_aauint(char *buffer, const struct kernel_param *kp)
{
if (!apparmor_enabled)
return -EINVAL;
if (apparmor_initialized && !policy_view_capable(NULL))
if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
return -EPERM;
return param_get_uint(buffer, kp);
}
@ -1516,7 +1516,7 @@ static int param_get_aacompressionlevel(char *buffer,
{
if (!apparmor_enabled)
return -EINVAL;
if (apparmor_initialized && !policy_view_capable(NULL))
if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
return -EPERM;
return param_get_int(buffer, kp);
}
@ -1525,7 +1525,7 @@ static int param_get_audit(char *buffer, const struct kernel_param *kp)
{
if (!apparmor_enabled)
return -EINVAL;
if (apparmor_initialized && !policy_view_capable(NULL))
if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
return -EPERM;
return sprintf(buffer, "%s", audit_mode_names[aa_g_audit]);
}
@ -1538,7 +1538,7 @@ static int param_set_audit(const char *val, const struct kernel_param *kp)
return -EINVAL;
if (!val)
return -EINVAL;
if (apparmor_initialized && !policy_admin_capable(NULL))
if (apparmor_initialized && !aa_current_policy_admin_capable(NULL))
return -EPERM;
i = match_string(audit_mode_names, AUDIT_MAX_INDEX, val);
@ -1553,7 +1553,7 @@ static int param_get_mode(char *buffer, const struct kernel_param *kp)
{
if (!apparmor_enabled)
return -EINVAL;
if (apparmor_initialized && !policy_view_capable(NULL))
if (apparmor_initialized && !aa_current_policy_view_capable(NULL))
return -EPERM;
return sprintf(buffer, "%s", aa_profile_mode_names[aa_g_profile_mode]);
@ -1567,7 +1567,7 @@ static int param_set_mode(const char *val, const struct kernel_param *kp)
return -EINVAL;
if (!val)
return -EINVAL;
if (apparmor_initialized && !policy_admin_capable(NULL))
if (apparmor_initialized && !aa_current_policy_admin_capable(NULL))
return -EPERM;
i = match_string(aa_profile_mode_names, APPARMOR_MODE_NAMES_MAX_INDEX,
@ -1703,7 +1703,7 @@ static int __init alloc_buffers(void)
static int apparmor_dointvec(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
if (!policy_admin_capable(NULL))
if (!aa_current_policy_admin_capable(NULL))
return -EPERM;
if (!apparmor_enabled)
return -EINVAL;

41
security/apparmor/policy.c
View File

@ -632,17 +632,18 @@ static int audit_policy(struct aa_label *label, const char *op,
}
/**
* policy_view_capable - check if viewing policy in at @ns is allowed
* ns: namespace being viewed by current task (may be NULL)
* aa_policy_view_capable - check if viewing policy in at @ns is allowed
* label: label that is trying to view policy in ns
* ns: namespace being viewed by @label (may be NULL if @label's ns)
* Returns: true if viewing policy is allowed
*
* If @ns is NULL then the namespace being viewed is assumed to be the
* tasks current namespace.
*/
bool policy_view_capable(struct aa_ns *ns)
bool aa_policy_view_capable(struct aa_label *label, struct aa_ns *ns)
{
struct user_namespace *user_ns = current_user_ns();
struct aa_ns *view_ns = aa_get_current_ns();
struct aa_ns *view_ns = labels_view(label);
bool root_in_user_ns = uid_eq(current_euid(), make_kuid(user_ns, 0)) ||
in_egroup_p(make_kgid(user_ns, 0));
bool response = false;
@ -654,12 +655,11 @@ bool policy_view_capable(struct aa_ns *ns)
(unprivileged_userns_apparmor_policy != 0 &&
user_ns->level == view_ns->level)))
response = true;
aa_put_ns(view_ns);
return response;
}
bool policy_admin_capable(struct aa_ns *ns)
bool aa_policy_admin_capable(struct aa_label *label, struct aa_ns *ns)
{
struct user_namespace *user_ns = current_user_ns();
bool capable = ns_capable(user_ns, CAP_MAC_ADMIN);
@ -667,7 +667,32 @@ bool policy_admin_capable(struct aa_ns *ns)
AA_DEBUG("cap_mac_admin? %d\n", capable);
AA_DEBUG("policy locked? %d\n", aa_g_lock_policy);
return policy_view_capable(ns) && capable && !aa_g_lock_policy;
return aa_policy_view_capable(label, ns) && capable &&
!aa_g_lock_policy;
}
bool aa_current_policy_view_capable(struct aa_ns *ns)
{
struct aa_label *label;
bool res;
label = __begin_current_label_crit_section();
res = aa_policy_view_capable(label, ns);
__end_current_label_crit_section(label);
return res;
}
bool aa_current_policy_admin_capable(struct aa_ns *ns)
{
struct aa_label *label;
bool res;
label = __begin_current_label_crit_section();
res = aa_policy_admin_capable(label, ns);
__end_current_label_crit_section(label);
return res;
}
/**
@ -693,7 +718,7 @@ int aa_may_manage_policy(struct aa_label *label, struct aa_ns *ns, u32 mask)
return audit_policy(label, op, NULL, NULL, "policy_locked",
-EACCES);
if (!policy_admin_capable(ns))
if (!aa_policy_admin_capable(label, ns))
return audit_policy(label, op, NULL, NULL, "not policy admin",
-EACCES);