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
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
| #!/usr/bin/ruby -w
# Try to find running processes using different methods, and report
# processes found through some means but not through others.
#
# Exit code 2 means something fishy was detected.
#
# Exit code 1 means something went wrong.
# Copyright 2009 by Johan Walles, johan.walles@gmail.com
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
require 'set'
require 'dl/import'
require 'dl/struct'
# Support for libc functions not covered by the standard Ruby
# libraries
module LibC
if RUBY_VERSION =~ /^1\.8/
extend DL::Importable
else
extend DL::Importer
end
dlload "libc.so.6"
# PID scanning functions
extern "int getsid(int)"
extern "int sched_getscheduler(int)"
extern "int sched_getparam(int, void*)"
extern "int sched_rr_get_interval(int, void*)"
extern "int sched_getaffinity(int, int, void*)"
extern "int readlink(char *, char *, int)"
extern "int kill(int, int)"
# We want to ask sysinfo about the number of active PIDs. This
# result struct has been taken from the sysinfo(2) Linux man page.
SysInfoData = struct [
"long uptime",
"long loads[3]",
"long totalram",
"long freeram",
"long sharedram",
"long bufferram",
"long totalswap",
"long freeswap",
"short procs",
"long padding[42]"
]
extern "int sysinfo(void *)"
end
# A piece of scratch memory where system calls can fill in
# information. What's written here is not interesting, it's just that
# some of the PID scanning functions need a memory area to write into.
scratch = "\0" * 1024
# Make sure our scratch buffer is large enough for sched_getaffinity()
while LibC.sched_getaffinity(0, scratch.length, scratch) == -1
scratch = "\0" * (scratch.length * 2)
end
$proc_parent_pids = nil
$proc_tasks = nil
$ps_pids = nil
$proc_readdir_pids = nil
def setup
# List all parent processes pointed out by anybody in /proc
$proc_parent_pids = Set.new
proc_dir = Dir.new("/proc")
proc_dir.each do |proc_entry|
next unless File.directory?("/proc/" + proc_entry)
next unless proc_entry =~ /^[0-9]+$/
status_file = File.new("/proc/#{proc_entry}/status")
begin
status_file.each_line do |line|
line.chomp!
next unless line =~ /^ppid:\s+([0-9]+)$/i
ppid = $1.to_i
$proc_parent_pids << ppid
break
end
ensure
status_file.close
end
end
proc_dir.close
# List all thread pids in /proc
$proc_tasks = {}
proc_dir = Dir.new("/proc")
proc_dir.each do |proc_entry|
next unless File.directory?("/proc/" + proc_entry)
next unless proc_entry =~ /^[0-9]+$/
task_dir = Dir.new("/proc/#{proc_entry}/task")
begin
task_dir.each do |task_pid|
next unless task_pid =~ /^[0-9]+$/
# "true" means we *have* an executable
exe = true
begin
# Store the *name* of the executable
exe = File.readlink("/proc/#{proc_entry}/task/#{task_pid}/exe")
rescue Errno::EACCES, Errno::ENOENT
# This block intentionally left blank
end
$proc_tasks[task_pid.to_i] = exe
end
ensure
task_dir.close
end
end
proc_dir.close
# List all PIDs displayed by ps
$ps_pids = {}
$ps_pids.default = false
ps_stdout = IO.popen("ps axHo lwp,cmd", "r")
ps_pid = ps_stdout.pid
ps_stdout.each_line do |ps_line|
ps_line.chomp!
next unless ps_line =~ /^\s*([0-9]+)\s+([^ ]+).*$/
pid = $1.to_i
exe = $2
$ps_pids[pid] = exe
end
ps_stdout.close
# Remove the ps process itself from our pid list
$ps_pids.delete ps_pid
# List all pids found by readdir on /proc
$proc_readdir_pids = Set.new
Dir.open("/proc").each do |dir|
next unless dir =~ /^[0-9]+$/
$proc_readdir_pids << dir.to_i
end
end
# Return errno after last library call
def get_errno()
return DL.respond_to?("last_error") ? DL::last_error : Fiddle::last_error
end
# This array contains named PID detectors. Given a PID to examine they
# can say:
# * true (it exists)
# * "some string" (it exists, and here is its name)
# * false (it doesn't exist)
# * nil (don't know)
$pid_detectors = [
["ps", proc { |pid|
# Does "ps" list this pid?
$ps_pids[pid]
}],
["/proc naive", lambda { |pid|
# Is there a /proc entry for this pid?
File.directory?("/proc/#{pid}")
}],
["/proc readdir", lambda { |pid|
# Did we find this pid when listing the contents of /proc?
if $proc_readdir_pids.include?(pid)
true
else
nil
end
}],
["/proc opendir", lambda { |pid|
# Is there a /proc entry for this pid that we can do opendir() on?
begin
Dir.open("/proc/#{pid}")
true
rescue Errno::ENOENT
false
end
}],
["/proc/<pid>/status", lambda { |pid|
# Parse the process name out of /proc/1234/status
begin
process_name = true
File.open("/proc/#{pid}/status").each do |line|
next unless line =~ /Name:[\t ]+(.*)$/
process_name = $1
break
end
process_name
rescue Errno::ENOENT
false
end
}],
["/proc readlink", lambda { |pid|
# Read the /proc/1234/exe entry for this pid
begin
File.readlink("/proc/#{pid}/exe")
rescue Errno::EACCES
"<run unhide.rb as root to identify exe>"
rescue Errno::ENOENT
# Some kernel processes have unreadable symlinks in /proc/1234/pid, and
# we can't tell "unreadable symlink" apart from "process doesn't exist"
nil
end
}],
["/proc libc-readlink", lambda { |pid|
# Is this process visible by the readlink libc function?
# The result of this can differ from File.readlink() if
# somebody has preloaded a library that overrides certain
# libc functions as described here:
# http://sourceforge.net/mailarchive/message.php?msg_id=28258660
length = LibC.readlink("/proc/#{pid}/exe", scratch, scratch.length)
if length >= 0
scratch[0..(length - 1)]
else
case get_errno()
when 2 # ENOENT
# Some kernel processes have unreadable symlinks in /proc/1234/pid, and
# we can't tell "unreadable symlink" apart from "process doesn't exist"
nil
when 13 # EACCES
"<run unhide.rb as root to identify exe>"
else
raise "Unknown errno #{errno}"
end
end
}],
["/proc tasks", proc { |pid|
# Is there a /proc/1234/tasks/pid directory for
# this pid?
$proc_tasks[pid]
}],
["/proc parent", proc { |pid|
# Does any /proc entry point this pid out as a
# parent pid?
if $proc_parent_pids.include? pid
true
else
nil
end
}],
["/proc chdir", proc { |pid|
# Can we chdir into /proc/<pid>?
begin
Dir::chdir "/proc/#{pid}"
true
rescue Errno::ENOENT
false
end
}],
["getsid()", proc { |pid|
LibC.getsid(pid) != -1
}],
["getpgid()", proc { |pid|
exists = true
begin
Process.getpgid(pid)
rescue
exists = false
end
exists
}],
["getpriority()", proc { |pid|
exists = true
begin
Process.getpriority(Process::PRIO_PROCESS, pid)
rescue
exists = false
end
exists
}],
["sched_getparam()", proc { |pid|
LibC.sched_getparam(pid, scratch) != -1
}],
["sched_getaffinity()", proc { |pid|
LibC.sched_getaffinity(pid, scratch.length, scratch) != -1
}],
["sched_getscheduler()", proc { |pid|
LibC.sched_getscheduler(pid) != -1
}],
["kill(pid, 0)", proc { |pid|
if LibC.kill(pid, 0) == 0
true
else
case get_errno
when 1 # EPERM
true
when 3 # ESRCH
false
else
raise "Unknown errno #{errno}"
end
end
}]
]
found_something = false
# Scan PIDs and report those found by some means but not others
#
# Returns a map of pids->warning strings
def get_suspicious_pids(pids_to_scan = nil)
if pids_to_scan == nil
pid_max = File.new("/proc/sys/kernel/pid_max").gets.to_i
pids_to_scan = (1..pid_max)
end
return_me = Hash.new
pids_to_scan.each do |pid|
pid_exists = {}
$pid_detectors.each do |pid_detector|
detector_name = pid_detector[0]
detector_proc = pid_detector[1]
pid_exists[detector_name] = detector_proc.call(pid)
end
# Is there consensus about the existence of this process?
suspicious = false
existence_consensus = nil
pid_exists.values.each do |existence|
# Always over-write "don't know"
existence_consensus = existence if existence_consensus == nil
# This one is undecisive, skip it
next if existence == nil
# Does the result of this test match the consensus?
if existence_consensus == false
unless existence == false
suspicious = true
break
end
else
# Anything but "false" is considered to be true, can be a string
# with a process name in it for example
if existence == false
suspicious = true
break
end
end
end
if suspicious
# Put output in a string and add it to the return result
message = "Suspicious PID #{pid}:"
$pid_detectors.each do |detector|
detector_name = detector[0]
detector_result = pid_exists[detector_name]
next if detector_result == nil
description = ""
description =
" (\"#{detector_result}\")" if detector_result.class == String
message +=
sprintf("\n %s: %s%s",
detector_result ? " Seen by" : "Invisible to",
detector_name,
description)
end
return_me[pid] = message
end
end
return return_me
end
##
## Main program starts here
##
puts "Scanning for hidden processes..."
setup
# Check for unknown preloads. This will name the Jynx LD Poisoning
# library.
suspicious_mappings = Set.new
File.open("/proc/self/maps").each do |line|
next unless line =~ /[^\/]*(\/.*)$/
mapped_file = $1
next if File::exist? mapped_file
suspicious_mappings << mapped_file
end
unless suspicious_mappings.empty?
found_something = true
STDERR.puts "I have a mapped file (or more) that I can't access! Results may be wrong."
STDERR.puts "Check /etc/ld.so.preload or dynamic linker for compromise:"
suspicious_mappings.each do |mapping|
STDERR.puts " #{mapping}"
end
end
# Verify PID count between ps and sysinfo()
sysinfo = LibC::SysInfoData.malloc
if LibC.sysinfo(sysinfo) == -1
STDERR.puts "Error: failed calling sysinfo()"
exit 1
end
if sysinfo.procs != $ps_pids.size
$stderr.puts "ps and sysinfo() process count mismatch:"
$stderr.puts " ps: #{$ps_pids.size} processes"
$stderr.puts " sysinfo(): #{sysinfo.procs} processes"
found_something = true
end
suspicious_pids = get_suspicious_pids
unless suspicious_pids.empty?
# Filter out false positives by testing all positives again. False
# positives occur when we race with processes starting up or
# shutting down.
setup
still_suspicious_pids = get_suspicious_pids(suspicious_pids.keys)
still_suspicious_pids.keys.sort.each do |still_suspicious_pid|
warning_text = suspicious_pids[still_suspicious_pid]
next unless warning_text
found_something = true
$stderr.puts warning_text
end
end
if found_something
exit 2
else
puts "No hidden processes found!"
end |
[Aide] Rkhunter scan
Répondre avec citation
) vraiment très efficace mais qui encore une fois doit être maitrisé sous peine de "sa march pa"
aujourd'hui le suivi des drivers les mises à jours du système et les installations de logiciels et les nombreux gui pour gérer tous ça me semble correct pour y rester, avec mon niveau d'informatique.
Partager