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in_winevtlog: Retrieve actual user account's domain and name #8992

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Jun 21, 2024
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in_winevtlog: Retrieve actual user account's domain and name #8992

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70 changes: 66 additions & 4 deletions plugins/in_winevtlog/pack.c
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Original file line number Diff line number Diff line change
Expand Up @@ -261,20 +261,82 @@ static int pack_filetime(struct winevtlog_config *ctx, ULONGLONG filetime)
return 0;
}

static int pack_sid(struct winevtlog_config *ctx, PSID sid)
static int pack_sid(struct winevtlog_config *ctx, PSID sid, int extract_sid)
{
#define MAX_NAME 256
size_t size;
LPWSTR wide_sid = NULL;
DWORD len = MAX_NAME, err = ERROR_SUCCESS;
int ret = -1;
SID_NAME_USE sid_type = SidTypeUnknown;
char account[MAX_NAME];
char domain[MAX_NAME];
PSID pSID = NULL;
DWORD result_len = 0;
flb_sds_t formatted = NULL;

if (ConvertSidToStringSidW(sid, &wide_sid)) {
if (extract_sid == FLB_TRUE) {
if (!LookupAccountSidA(NULL, sid,
account, &len, domain,
&len, &sid_type)) {
err = GetLastError();
if (err == ERROR_NONE_MAPPED) {
strcpy_s(account, MAX_NAME, "NONE_MAPPED");
}
else {
flb_plg_warn(ctx->ins, "LookupAccountSid Error %u", err);
}

goto error;
}

result_len = strlen(domain) + 1 + strlen(account) + 1;
formatted = flb_sds_create_size(result_len);
if (formatted == NULL) {
flb_plg_warn(ctx->ins, "create result buffer failed");

goto error;
}

_snprintf_s(formatted, result_len, _TRUNCATE, "%s\\%s", domain, account);

if (size > 0) {
flb_log_event_encoder_append_body_cstring(ctx->log_encoder, formatted);

ret = 0;
}
else {
flb_plg_warn(ctx->ins, "format domain\\account failed");
flb_sds_destroy(formatted);

ret = -1;

goto error;
}

LocalFree(wide_sid);
flb_sds_destroy(formatted);

return ret;
}
else {
ret = pack_wstr(ctx, wide_sid);
LocalFree(wide_sid);

return ret;
}

error:
ret = pack_wstr(ctx, wide_sid);

LocalFree(wide_sid);
return ret;

return -1;
}

return ret;
#undef MAX_NAME
}

static void pack_string_inserts(struct winevtlog_config *ctx, PEVT_VARIANT values, DWORD count)
Expand Down Expand Up @@ -355,7 +417,7 @@ static void pack_string_inserts(struct winevtlog_config *ctx, PEVT_VARIANT value
}
break;
case EvtVarTypeSid:
if (pack_sid(ctx, values[i].SidVal)) {
if (pack_sid(ctx, values[i].SidVal, FLB_FALSE)) {
pack_nullstr(ctx);
}
break;
Expand Down Expand Up @@ -601,7 +663,7 @@ void winevtlog_pack_event(PEVT_VARIANT system, WCHAR *message,
/* UserID */
ret = flb_log_event_encoder_append_body_cstring(ctx->log_encoder, "UserID");

if (pack_sid(ctx, system[EvtSystemUserID].SidVal)) {
if (pack_sid(ctx, system[EvtSystemUserID].SidVal, FLB_TRUE)) {
pack_nullstr(ctx);
}

Expand Down
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