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feat(bpf-lsm): add tty information to telemetry #2029

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feat(bpf-lsm): add tty information to telemetry #2029

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38 changes: 25 additions & 13 deletions KubeArmor/BPF/shared.h
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,7 @@ char LICENSE[] SEC("license") = "Dual BSD/GPL";
#define AUDIT_POSTURE 140
#define BLOCK_POSTURE 141
#define CAPABLE_KEY 200
#define TTY_LEN 64

enum {
IPPROTO_ICMPV6 = 58
Expand Down Expand Up @@ -130,6 +131,7 @@ typedef struct {
s64 retval;

u8 comm[TASK_COMM_LEN];
u8 tty[TTY_LEN];

bufs_k data;
} event;
Expand Down Expand Up @@ -324,27 +326,37 @@ static inline void get_outer_key(struct outer_key *pokey,

static __always_inline u32 init_context(event *event_data) {
struct task_struct *task = (struct task_struct *)bpf_get_current_task();
u32 tgid, pid;
u32 uid = bpf_get_current_uid_gid() & 0xffffffff;

event_data->ts = bpf_ktime_get_ns();

event_data->pid_id = get_task_pid_ns_id(task);
event_data->mnt_id = get_task_mnt_ns_id(task);
event_data->host_ppid = get_task_ppid(task);
event_data->host_pid = bpf_get_current_pid_tgid() >> 32;
event_data->ppid = get_task_ns_ppid(task);
event_data->pid = get_task_ns_tgid(task);
event_data->uid = uid;

struct outer_key okey;
get_outer_key(&okey, task);
event_data->pid_id = okey.pid_ns;
event_data->mnt_id = okey.mnt_ns;

event_data->ppid = get_task_ppid(task);
event_data->pid = get_task_ns_tgid(task);
bpf_get_current_comm(&event_data->comm, sizeof(event_data->comm));

event_data->uid = bpf_get_current_uid_gid();
// Get TTY information
struct signal_struct *signal = READ_KERN(task->signal);
if (signal != NULL) {
struct tty_struct *tty = READ_KERN(signal->tty);
if (tty != NULL) {
bpf_probe_read_str(&event_data->tty, TTY_LEN, (void *)tty->name);
} else {
event_data->tty[0] = '\0';
}
} else {
event_data->tty[0] = '\0';
}

// Clearing array to avoid garbage values
__builtin_memset(event_data->comm, 0, sizeof(event_data->comm));
bpf_get_current_comm(&event_data->comm, sizeof(event_data->comm));
struct outer_key okey;
get_outer_key(&okey, task);

return 0;
return okey.pid_ns;
}


Expand Down