1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
|
local datetime = require "datetime"
local rpc = require "rpc"
local shortport = require "shortport"
local stdnse = require "stdnse"
local string = require "string"
local tab = require "tab"
description = [[
Connects to rusersd RPC service and retrieves a list of logged-in users.
]]
---
--@output
--| USER ON FROM SINCE IDLE
--| LOGIN console 2015-11-08T12:03:50 8h55m58s
--| root console :0 2015-11-08T12:06:49 8h55m58s
--| root pts/2 :0.0 2015-11-08T12:07:06 2d02h51m48s
--| .telnet /dev/pts 2016-03-14T12:07:46 24855d03h14m07s
--| .telnet /dev/pts 2016-03-14T10:25:09 24855d03h14m07s
--| .telnet /dev/pts 2016-03-03T10:02:15 24855d03h14m07s
--| root pts/4 2016-03-07T09:21:14 1m48s
--| root pts/3 ns3 2016-02-16T09:45:24 35s
--| root pts/4 ns3 2016-02-16T09:26:01 1m48s
--|_.telnet /dev/pts 2016-03-03T10:01:32 24855d03h14m07s
--
--@xmloutput
--<table>
-- <elem key="idle">1m49s</elem>
-- <elem key="host">ns3</elem>
-- <elem key="user">root</elem>
-- <elem key="time">2016-02-16T09:26:01</elem>
-- <elem key="tty">pts/4</elem>
--</table>
--<table>
-- <elem key="idle">24855d03h14m07s</elem>
-- <elem key="host"></elem>
-- <elem key="user">.telnet</elem>
-- <elem key="time">2016-03-03T10:01:32</elem>
-- <elem key="tty">/dev/pts</elem>
--</table>
--
author = "Daniel Miller"
license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
categories = {"discovery", "safe"}
dependencies = {"rpc-grind", "rpcinfo"}
portrule = shortport.service("rusersd", {"tcp", "udp"})
-- TODO: Support version 3
rpc.RPC_version["rusersd"] = rpc.RPC_version["rusersd"] or { min=2, max=2 }
local RUSERSPROC = {
NUM = 1,
NAMES = 2,
ALLNAMES = 3,
}
--- Get a RPC string, which is length-prefixed and padded with null bytes
-- @param comm an rpc.Comm object
-- @param data the data received so far
-- @param pos the current position in the data where the opaque string is
-- @param additional number of bytes to request after the string for the next
-- field. Saves a call to GetAdditionalBytes later.
-- @return position of next field or nil on error
-- @return the string extracted or error message
-- @return the data retrieved so far
local function get_zstring (comm, data, pos, additional)
local pos, len = rpc.Util.unmarshall_uint32(data, pos)
local status, data = comm:GetAdditionalBytes( data, pos, len + additional )
if not status then
return nil, "GetAdditionalBytes failed"
end
local pos, rval = rpc.Util.unmarshall_opaque(len, data, pos)
rval = string.match(rval, "^(.-)\0*$")
return pos, rval, data
end
local function fail (err, ...)
stdnse.debug1(err, ...)
return nil
end
-- Extract a utmpidle structure:
-- /*
-- * This is the structure used in version 2 of the rusersd RPC service.
-- * It corresponds to the utmp structure for BSD systems.
-- */
-- struct ru_utmp {
-- char ut_line[8]; /* tty name */
-- char ut_name[8]; /* user id */
-- char ut_host[16]; /* host name, if remote */
-- long int ut_time; /* time on */
-- };
--
-- struct utmpidle {
-- struct ru_utmp ui_utmp;
-- unsigned int ui_idle;
-- };
local function rusers2_entry(comm, data, pos)
local entry = {}
pos, entry.tty, data = get_zstring(comm, data, pos, 4)
if not pos then return fail(entry.tty) end
pos, entry.user, data = get_zstring(comm, data, pos, 4)
if not pos then return fail(entry.user) end
pos, entry.host, data = get_zstring(comm, data, pos, 8)
if not pos then return fail(entry.host) end
pos, entry.time = rpc.Util.unmarshall_uint32(data, pos)
entry.time = datetime.format_timestamp(entry.time)
pos, entry.idle = rpc.Util.unmarshall_uint32(data, pos)
entry.idle = datetime.format_time(entry.idle)
return pos, entry, data
end
action = function(host, port)
local comm = rpc.Comm:new("rusersd", 2)
local status, err = comm:Connect(host, port)
if not status then
return fail("RPC connect error: %s", err)
end
local packet = comm:EncodePacket(nil, RUSERSPROC.ALLNAMES, {type = rpc.Portmap.AuthType.NULL}, nil)
status, err = comm:SendPacket(packet)
if not status then
return fail("RPC send error: %s", err)
end
local status, data = comm:ReceivePacket()
if not status then
return fail("RPC receive error: %s", data)
end
local pos, header = comm:DecodeHeader(data, 1)
if not header then
return fail("RPC decode header error")
end
if header.type ~= rpc.Portmap.MessageType.REPLY then
return fail("Packet was not a reply")
end
if header.state ~= rpc.Portmap.State.MSG_ACCEPTED then
return fail("RPC call failed: %s", rpc.Portmap.RejectMsg[header.denied_state] or header.state)
end
if header.accept_state ~= rpc.Portmap.AcceptState.SUCCESS then
return fail("RPC accepted state: %s", rpc.Portmap.AcceptMsg[header.accept_state] or header.accept_state)
end
status, data = comm:GetAdditionalBytes( data, pos, 4 )
if not status then
return fail("Failed to call GetAdditionalBytes")
end
local pos, num_names = rpc.Util.unmarshall_uint32(data, pos)
local out = {}
local out_tab = tab.new()
tab.addrow(out_tab, "USER", "ON", "FROM", "SINCE", "IDLE")
for i=1, num_names do
local entry
pos, entry, data = rusers2_entry(comm, data, pos)
tab.addrow(out_tab, entry.user, entry.tty, entry.host, entry.time, entry.idle)
out[#out+1] = entry
end
if next(out) then
return out, "\n" .. tab.dump(out_tab)
end
end
|