[RFC PATCH ghak32 V2 09/13] audit: add containerid support for config/feature/user records

Richard Guy Briggs
2018-03-16T09:00:36Z

Add container ID auxiliary records to configuration change, feature set change
and user generated standalone records.

Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
---
kernel/audit.c | 50 ++++++++++++++++++++++++++++++++++++++++----------
kernel/auditfilter.c | 5 ++++-
2 files changed, 44 insertions(+), 11 deletions(-)

diff --git a/kernel/audit.c b/kernel/audit.c
index b238be5..08662b4 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -400,8 +400,9 @@ static int audit_log_config_change(char *function_name, u32 new, u32 old,
{
struct audit_buffer *ab;
int rc = 0;
+ struct audit_context *context = audit_alloc_local();

- ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
+ ab = audit_log_start(context, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
if (unlikely(!ab))
return rc;
audit_log_format(ab, "%s=%u old=%u", function_name, new, old);
@@ -411,6 +412,8 @@ static int audit_log_config_change(char *function_name, u32 new, u32 old,
allow_changes = 0; /* Something weird, deny request */
audit_log_format(ab, " res=%d", allow_changes);
audit_log_end(ab);
+ audit_log_container_info(context, "config", audit_get_containerid(current));
+ audit_free_context(context);
return rc;
}

@@ -1058,7 +1061,8 @@ static int audit_netlink_ok(struct sk_buff *skb, u16 msg_type)
return err;
}

-static void audit_log_common_recv_msg(struct audit_buffer **ab, u16 msg_type)
+static void audit_log_common_recv_msg(struct audit_context *context,
+ struct audit_buffer **ab, u16 msg_type)
{
uid_t uid = from_kuid(&init_user_ns, current_uid());
pid_t pid = task_tgid_nr(current);
@@ -1068,7 +1072,7 @@ static void audit_log_common_recv_msg(struct audit_buffer **ab, u16 msg_type)
return;
}

- *ab = audit_log_start(NULL, GFP_KERNEL, msg_type);
+ *ab = audit_log_start(context, GFP_KERNEL, msg_type);
if (unlikely(!*ab))
return;
audit_log_format(*ab, "pid=%d uid=%u", pid, uid);
@@ -1097,11 +1101,12 @@ static void audit_log_feature_change(int which, u32 old_feature, u32 new_feature
u32 old_lock, u32 new_lock, int res)
{
struct audit_buffer *ab;
+ struct audit_context *context = audit_alloc_local();

if (audit_enabled == AUDIT_OFF)
return;

- ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_FEATURE_CHANGE);
+ ab = audit_log_start(context, GFP_KERNEL, AUDIT_FEATURE_CHANGE);
if (!ab)
return;
audit_log_task_info(ab, current);
@@ -1109,6 +1114,8 @@ static void audit_log_feature_change(int which, u32 old_feature, u32 new_feature
audit_feature_names[which], !!old_feature, !!new_feature,
!!old_lock, !!new_lock, res);
audit_log_end(ab);
+ audit_log_container_info(context, "feature", audit_get_containerid(current));
+ audit_free_context(context);
}

static int audit_set_feature(struct sk_buff *skb)
@@ -1337,13 +1344,15 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)

err = audit_filter(msg_type, AUDIT_FILTER_USER);
if (err == 1) { /* match or error */
+ struct audit_context *context = audit_alloc_local();
+
err = 0;
if (msg_type == AUDIT_USER_TTY) {
err = tty_audit_push();
if (err)
break;
}
- audit_log_common_recv_msg(&ab, msg_type);
+ audit_log_common_recv_msg(context, &ab, msg_type);
if (msg_type != AUDIT_USER_TTY)
audit_log_format(ab, " msg='%.*s'",
AUDIT_MESSAGE_TEXT_MAX,
@@ -1359,6 +1368,9 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
audit_log_n_untrustedstring(ab, data, size);
}
audit_log_end(ab);
+ audit_log_container_info(context, "user",
+ audit_get_containerid(current));
+ audit_free_context(context);
}
break;
case AUDIT_ADD_RULE:
@@ -1366,9 +1378,14 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
if (nlmsg_len(nlh) < sizeof(struct audit_rule_data))
return -EINVAL;
if (audit_enabled == AUDIT_LOCKED) {
- audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE);
+ struct audit_context *context = audit_alloc_local();
+
+ audit_log_common_recv_msg(context, &ab, AUDIT_CONFIG_CHANGE);
audit_log_format(ab, " audit_enabled=%d res=0", audit_enabled);
audit_log_end(ab);
+ audit_log_container_info(context, "config",
+ audit_get_containerid(current));
+ audit_free_context(context);
return -EPERM;
}
err = audit_rule_change(msg_type, seq, data, nlmsg_len(nlh));
@@ -1376,17 +1393,23 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
case AUDIT_LIST_RULES:
err = audit_list_rules_send(skb, seq);
break;
- case AUDIT_TRIM:
+ case AUDIT_TRIM: {
+ struct audit_context *context = audit_alloc_local();
audit_trim_trees();
- audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE);
+ audit_log_common_recv_msg(context, &ab, AUDIT_CONFIG_CHANGE);
audit_log_format(ab, " op=trim res=1");
audit_log_end(ab);
+ audit_log_container_info(context, "config",
+ audit_get_containerid(current));
+ audit_free_context(context);
break;
+ }
case AUDIT_MAKE_EQUIV: {
void *bufp = data;
u32 sizes[2];
size_t msglen = nlmsg_len(nlh);
char *old, *new;
+ struct audit_context *context = audit_alloc_local();

err = -EINVAL;
if (msglen < 2 * sizeof(u32))
@@ -1408,7 +1431,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
/* OK, here comes... */
err = audit_tag_tree(old, new);

- audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE);
+ audit_log_common_recv_msg(context, &ab, AUDIT_CONFIG_CHANGE);

audit_log_format(ab, " op=make_equiv old=");
audit_log_untrustedstring(ab, old);
@@ -1418,6 +1441,9 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
audit_log_end(ab);
kfree(old);
kfree(new);
+ audit_log_container_info(context, "config",
+ audit_get_containerid(current));
+ audit_free_context(context);
break;
}
case AUDIT_SIGNAL_INFO:
@@ -1459,6 +1485,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
struct audit_tty_status s, old;
struct audit_buffer *ab;
unsigned int t;
+ struct audit_context *context = audit_alloc_local();

memset(&s, 0, sizeof(s));
/* guard against past and future API changes */
@@ -1477,12 +1504,15 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
old.enabled = t & AUDIT_TTY_ENABLE;
old.log_passwd = !!(t & AUDIT_TTY_LOG_PASSWD);

- audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE);
+ audit_log_common_recv_msg(context, &ab, AUDIT_CONFIG_CHANGE);
audit_log_format(ab, " op=tty_set old-enabled=%d new-enabled=%d"
" old-log_passwd=%d new-log_passwd=%d res=%d",
old.enabled, s.enabled, old.log_passwd,
s.log_passwd, !err);
audit_log_end(ab);
+ audit_log_container_info(context, "config",
+ audit_get_containerid(current));
+ audit_free_context(context);
break;
}
default:
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index c4c8746..5f7f4d6 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -1109,11 +1109,12 @@ static void audit_log_rule_change(char *action, struct audit_krule *rule, int re
struct audit_buffer *ab;
uid_t loginuid = from_kuid(&init_user_ns, audit_get_loginuid(current));
unsigned int sessionid = audit_get_sessionid(current);
+ struct audit_context *context = audit_alloc_local();

if (!audit_enabled)
return;

- ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
+ ab = audit_log_start(context, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
if (!ab)
return;
audit_log_format(ab, "auid=%u ses=%u" ,loginuid, sessionid);
@@ -1122,6 +1123,8 @@ static void audit_log_rule_change(char *action, struct audit_krule *rule, int re
audit_log_key(ab, rule->filterkey);
audit_log_format(ab, " list=%d res=%d", rule->listnr, res);
audit_log_end(ab);
+ audit_log_container_info(context, "config", audit_get_containerid(current));
+ audit_free_context(context);
}

/**
--
1.8.3.1