Add audit support for unix_stream_connect, unix_may_send, task_kill, and file_send_sigiotask hooks.
The related blockers are: - scope.abstract_unix_socket - scope.signal Audit event sample for abstract unix socket: type=LANDLOCK_DENY msg=audit(1729738800.268:30): domain=195ba459b blockers=scope.abstract_unix_socket path=00666F6F Audit event sample for signal: type=LANDLOCK_DENY msg=audit(1729738800.291:31): domain=195ba459b blockers=scope.signal opid=1 ocomm="systemd" Cc: Günther Noack <[email protected]> Cc: Tahera Fahimi <[email protected]> Signed-off-by: Mickaël Salaün <[email protected]> Link: https://lore.kernel.org/r/[email protected] --- Changes since v3: - Cosmetic change to the "scope.*" blocker names. - Extend commit message. Changes since v1: - New patch. --- security/landlock/audit.c | 8 ++++++ security/landlock/audit.h | 2 ++ security/landlock/task.c | 58 ++++++++++++++++++++++++++++++++++++--- 3 files changed, 64 insertions(+), 4 deletions(-) diff --git a/security/landlock/audit.c b/security/landlock/audit.c index 2744e3d4fe73..7a2183ac9add 100644 --- a/security/landlock/audit.c +++ b/security/landlock/audit.c @@ -70,6 +70,14 @@ get_blocker(const enum landlock_request_type type, if (WARN_ON_ONCE(access_bit >= ARRAY_SIZE(net_access_strings))) return "unknown"; return net_access_strings[access_bit]; + + case LANDLOCK_REQUEST_SCOPE_ABSTRACT_UNIX_SOCKET: + WARN_ON_ONCE(access_bit != -1); + return "scope.abstract_unix_socket"; + + case LANDLOCK_REQUEST_SCOPE_SIGNAL: + WARN_ON_ONCE(access_bit != -1); + return "scope.signal"; } WARN_ON_ONCE(1); diff --git a/security/landlock/audit.h b/security/landlock/audit.h index 9a3697b901b5..dd5deaf7dc4d 100644 --- a/security/landlock/audit.h +++ b/security/landlock/audit.h @@ -19,6 +19,8 @@ enum landlock_request_type { LANDLOCK_REQUEST_FS_CHANGE_LAYOUT, LANDLOCK_REQUEST_FS_ACCESS, LANDLOCK_REQUEST_NET_ACCESS, + LANDLOCK_REQUEST_SCOPE_ABSTRACT_UNIX_SOCKET, + LANDLOCK_REQUEST_SCOPE_SIGNAL, }; /* diff --git a/security/landlock/task.c b/security/landlock/task.c index 4fef963274fd..1b3d5de89e14 100644 --- a/security/landlock/task.c +++ b/security/landlock/task.c @@ -263,13 +263,27 @@ static int hook_unix_stream_connect(struct sock *const sock, const struct landlock_ruleset *const dom = landlock_get_applicable_domain(landlock_get_current_domain(), unix_scope); + struct lsm_network_audit audit_net = { + .sk = other, + }; + struct landlock_request request = { + .type = LANDLOCK_REQUEST_SCOPE_ABSTRACT_UNIX_SOCKET, + .audit = { + .type = LSM_AUDIT_DATA_NET, + .u.net = &audit_net, + }, + }; /* Quick return for non-landlocked tasks. */ if (!dom) return 0; - if (is_abstract_socket(other) && sock_is_scoped(other, dom)) + if (is_abstract_socket(other) && sock_is_scoped(other, dom)) { + request.layer_plus_one = + landlock_match_layer_level(dom, unix_scope) + 1; + landlock_log_denial(dom, &request); return -EPERM; + } return 0; } @@ -280,6 +294,16 @@ static int hook_unix_may_send(struct socket *const sock, const struct landlock_ruleset *const dom = landlock_get_applicable_domain(landlock_get_current_domain(), unix_scope); + struct lsm_network_audit audit_net = { + .sk = other->sk, + }; + struct landlock_request request = { + .type = LANDLOCK_REQUEST_SCOPE_ABSTRACT_UNIX_SOCKET, + .audit = { + .type = LSM_AUDIT_DATA_NET, + .u.net = &audit_net, + }, + }; if (!dom) return 0; @@ -291,8 +315,12 @@ static int hook_unix_may_send(struct socket *const sock, if (unix_peer(sock->sk) == other->sk) return 0; - if (is_abstract_socket(other->sk) && sock_is_scoped(other->sk, dom)) + if (is_abstract_socket(other->sk) && sock_is_scoped(other->sk, dom)) { + request.layer_plus_one = + landlock_match_layer_level(dom, unix_scope) + 1; + landlock_log_denial(dom, &request); return -EPERM; + } return 0; } @@ -307,6 +335,13 @@ static int hook_task_kill(struct task_struct *const p, { bool is_scoped; const struct landlock_ruleset *dom; + struct landlock_request request = { + .type = LANDLOCK_REQUEST_SCOPE_SIGNAL, + .audit = { + .type = LSM_AUDIT_DATA_TASK, + .u.tsk = p, + }, + }; if (cred) { /* Dealing with USB IO. */ @@ -324,8 +359,12 @@ static int hook_task_kill(struct task_struct *const p, is_scoped = domain_is_scoped(dom, landlock_get_task_domain(p), LANDLOCK_SCOPE_SIGNAL); rcu_read_unlock(); - if (is_scoped) + if (is_scoped) { + request.layer_plus_one = + landlock_match_layer_level(dom, signal_scope) + 1; + landlock_log_denial(dom, &request); return -EPERM; + } return 0; } @@ -334,6 +373,13 @@ static int hook_file_send_sigiotask(struct task_struct *tsk, struct fown_struct *fown, int signum) { const struct landlock_ruleset *dom; + struct landlock_request request = { + .type = LANDLOCK_REQUEST_SCOPE_SIGNAL, + .audit = { + .type = LSM_AUDIT_DATA_TASK, + .u.tsk = tsk, + }, + }; bool is_scoped = false; /* Lock already held by send_sigio() and send_sigurg(). */ @@ -349,8 +395,12 @@ static int hook_file_send_sigiotask(struct task_struct *tsk, is_scoped = domain_is_scoped(dom, landlock_get_task_domain(tsk), LANDLOCK_SCOPE_SIGNAL); rcu_read_unlock(); - if (is_scoped) + if (is_scoped) { + request.layer_plus_one = + landlock_match_layer_level(dom, signal_scope) + 1; + landlock_log_denial(dom, &request); return -EPERM; + } return 0; } -- 2.47.1
