[PATCH ghak90 V7 17/21] audit: add support for loginuid/sessionid set/get by netlink

Add the ability to get and set the login uid and to get the session id using an audit netlink message using message types AUDIT_GET_LOGINUID 1024, AUDIT_SET_LOGINUID 1025 and AUDIT_GET_SESSIONID 1026 in addition to using the proc filesystem. Signed-off-by: Richard Guy Briggs <rgb(a)redhat.com&gt; --- include/uapi/linux/audit.h | 3 +++ kernel/audit.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 65 insertions(+) diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h index e26729fc9943..eef42c8eea77 100644 --- a/include/uapi/linux/audit.h +++ b/include/uapi/linux/audit.h @@ -75,6 +75,9 @@ #define AUDIT_SIGNAL_INFO2 1021 /* Get info auditd signal sender */ #define AUDIT_GET_CONTID 1022 /* Get contid of a task */ #define AUDIT_SET_CONTID 1023 /* Set contid of a task */ +#define AUDIT_GET_LOGINUID 1024 /* Get loginuid of a task */ +#define AUDIT_SET_LOGINUID 1025 /* Set loginuid of a task */ +#define AUDIT_GET_SESSIONID 1026 /* Set sessionid of a task */ #define AUDIT_FIRST_USER_MSG 1100 /* Userspace messages mostly uninteresting to kernel */ #define AUDIT_USER_AVC 1107 /* We filter this differently */ diff --git a/kernel/audit.c b/kernel/audit.c index df92de20ed73..9e82de13d2eb 100644 --- a/kernel/audit.c +++ b/kernel/audit.c @@ -1184,6 +1184,15 @@ static int audit_netlink_ok(struct sk_buff *skb, u16 msg_type) { int err = 0; + /* These messages can work outside the initial namespaces */ + switch (msg_type) { + case AUDIT_GET_LOGINUID: + case AUDIT_GET_SESSIONID: + return 0; + break; + default: /* do more checks below */ + break; + } /* Only support initial user namespace for now. */ /* * We return ECONNREFUSED because it tricks userspace into thinking @@ -1218,6 +1227,7 @@ static int audit_netlink_ok(struct sk_buff *skb, u16 msg_type) case AUDIT_MAKE_EQUIV: case AUDIT_GET_CONTID: case AUDIT_SET_CONTID: + case AUDIT_SET_LOGINUID: /* Only support auditd and auditctl in initial pid namespace * for now. */ if (task_active_pid_ns(current) != &init_pid_ns) @@ -1292,6 +1302,33 @@ static int audit_get_contid_status(struct sk_buff *skb) return 0; } +struct audit_loginuid_status { uid_t loginuid; }; + +static int audit_get_loginuid_status(struct sk_buff *skb) +{ + u32 seq; + uid_t loginuid; + struct audit_loginuid_status ls; + + loginuid = from_kuid(current_user_ns(), audit_get_loginuid(current)); + ls.loginuid = loginuid; + + seq = nlmsg_hdr(skb)->nlmsg_seq; + audit_send_reply(skb, seq, AUDIT_GET_LOGINUID, 0, 0, &ls, sizeof(ls)); + return loginuid; +} + +static int audit_get_sessionid_status(struct sk_buff *skb) +{ + u32 seq; + struct audit_sessionid_status { u32 sessionid; }; + struct audit_sessionid_status ss = { audit_get_sessionid(current) }; + + seq = nlmsg_hdr(skb)->nlmsg_seq; + audit_send_reply(skb, seq, AUDIT_GET_SESSIONID, 0, 0, &ss, sizeof(ss)); + return audit_get_sessionid(current); +} + static void audit_log_feature_change(int which, u32 old_feature, u32 new_feature, u32 old_lock, u32 new_lock, int res) { @@ -1740,6 +1777,31 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) if (err) return err; break; + case AUDIT_SET_LOGINUID: { + uid_t *loginuid = data; + kuid_t kloginuid; + + /* check if new data is valid */ + if (nlmsg_len(nlh) < sizeof(u32)) + return -EINVAL; + + kloginuid = make_kuid(current_user_ns(), *loginuid); + if (!uid_valid(kloginuid)) + return -EINVAL; + + return audit_set_loginuid(kloginuid); + break; + } + case AUDIT_GET_LOGINUID: + err = audit_get_loginuid_status(skb); + if (err) + return err; + break; + case AUDIT_GET_SESSIONID: + err = audit_get_sessionid_status(skb); + if (err) + return err; + break; default: err = -EINVAL; break; -- 1.8.3.1