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  • 2019.09
SECCON令和に参加してみました
SECCON令和CTFへ参加したなり。なんとか2問(1問サービス問題)解けて423位/858。まずまずかなー。
解けた1問の解き方。
■問題
nc zerois-o-reiwa.seccon.jp 23615

■答え
pythonで実装。他の人のwrite upみたらもっとスマートなのたくさんねー。
#mkfifo testfifo
#cat testfifo | nc zerois-o-reiwa.seccon.jp 23615 | python test.py > testfifo
import re
import sys
while True:

    try:
        x = input()
    except EOFError as e:
        break
    sys.stderr.write("{}\n".format(x))
    if x[0:2] == "0=":
        m = re.findall("([+-]?[*?/0-9]+)", x[2:])
        z = 0
        #print(m)
        for x in m:
            #print("x={}".format(x))
            if x.find("?") >=0:
                y = eval(x.replace("?", "1"))
                #print("y={}".format(y))
            else:
                z += eval(x)
                #print("z={}".format(z))
        if float(y)==0:
            ans = "0"
        else:
            ans = "{}\n".format(int(-float(z)/float(y)))
        sys.stderr.write("{}\n".format(ans))
        sys.stdout.write("{}\n".format(ans))
PR
【2019/05/01 10:24 】 | その他 | 有り難いご意見(31)
                                    
TSURUGIを入れてみた
令和SECCONに参加するのでTSURUGI Linuxを入れてみました。

fluxboxに切り替えて「fbmenugen」を使ったら「Other」に「TSURUGI」メニューが全て入ってカテゴリが分からなくなってしまいました。
fluxboxを入れた直後
仕方がないのでpythonでmateからfluxboxのmenuに変換するプログラムを作成、すっきりしましたとさ。
menuを修正後
■変換用python
import sys
from xml.dom import minidom
from os import path
from collections import OrderedDict

APP_Directory = None
DIR_Directory = None
def main():
    global APP_Directory
    global DIR_Directory

    if len(sys.argv)!=2:
        print("Using: {} mate.conf".format(sys.argv[0]))
        return
    fileName = sys.argv[1]
    APP_Directory = path.abspath(path.dirname(fileName)+"/../applications")
    DIR_Directory = path.abspath(path.dirname(fileName)+"/../desktop-directories")
    print(fileName)

    with open(fileName, "r", True, "UTF-8") as r:
        x = "\n".join(r.readlines())
    myDom = minidom.parseString(x)
    
    recurseDict(myDom, 0, [])

def recurseDict(dic, layer, stack):
    #dic = minidom.parseString("")
    layer+=1
    if sum(1 for x in dic.childNodes if not isinstance(x, minidom.Text)):
        if dic.nodeName != "Layout":
            for d in dic.childNodes:
                if not isinstance(d, minidom.Text):
                    recurseDict(d, layer, stack)

    else:
        if dic.nodeName == "Directory":
            lidx = 0
            for lidx in range(len(stack), 0, -1):
                if layer > stack[lidx-1][0]:
                    break
            for _ in range(lidx, len(stack)):
                stack.pop()
                print("{}[end]".format(" "*(len(stack)*2)))
            
            v = readFile(DIR_Directory+"/"+dic.childNodes[0].nodeValue)
            print("{}[submenu] ({}) <{}>".format(" "*(len(stack)*2), v["Name"], v["Icon"]))
            stack.append((layer, v))

        if dic.nodeName == "Filename":
            v = readFile(APP_Directory+"/"+dic.childNodes[0].nodeValue)
            print("{}[exec] ({}) {{{}}} <{}>".format(" "*(len(stack)*2), v["Name"], v["Exec"], v["Icon"]))

    if layer==1:
        for _ in range(len(stack)):
            stack.pop()
            print("{}[end]".format(" "*(len(stack)*2)))

def readFile(fileName):
    with open(fileName, "r", True, "UTF-8") as r:
        rec=dict()
        while True:            
            line = r.readline()
            if line=="":
                break
            line = line[:-1]

            pos = line.find("=")
            if pos >=0:
                key = line[0:pos]

                if ["Icon", "Name", "Exec"].count(key):
                    rec[key] = line[pos+1:]

        return rec


if __name__ == "__main__":
    main()
■fbmenugenにinclude機能を追加
diff --git a/fbmenugen b/fbmenugen
index 84e268b..fa5e784 100755
--- a/fbmenugen
+++ b/fbmenugen
@@ -401,6 +401,14 @@ ITEM_WITH_ICON
 ITEM
 }

+sub prepare_include {
+    my $path= shift() =~ s/\)/\\)/gr;
+
+    return <<"EOF"
+  [include] ($path)
+EOF
+}
+
 sub begin_category {
     $with_icons
       ? <<"MENU_WITH_ICON"
@@ -479,6 +487,9 @@ foreach my $schema (@$SCHEMA) {
     elsif (exists $schema->{item}) {
         $generated_menu .= prepare_item(@{$schema->{item}});
     }
+    elsif (exists $schema->{include}) {
+        $generated_menu .= prepare_include(@{$schema->{include}});
+    }
     elsif (exists $schema->{sep}) {
         $generated_menu .= "[separator]\n";
     }
diff --git a/schema.pl b/schema.pl
index 18a824a..50ae0dd 100644
--- a/schema.pl
+++ b/schema.pl
@@ -5,6 +5,7 @@
 =for comment

     item:      add an item inside the menu               {item => ["command", "label", "icon"]},
+    include:   add include another file               {include => ["path"]},
     cat:       add a category inside the menu             {cat => ["name", "label", "icon"]},
     sep:       horizontal line separator                  {sep => undef}, {sep => "label"},
     raw:       any valid Fluxbox menu entry               {raw => q(...)},
【2019/04/25 22:29 】 | linux | 有り難いご意見(6)
                                    
UbuntuでCUPSを用いて自動命名印刷
CUPSのいつもの設定

■/etc/cups/cupsd.conf
...
# Restrict access to the admin pages...
<Location /admin>
  Require user @SYSTEM
  Order allow,deny
</Location>
...

■cups-pdfのインストール
sudo apt install cups-pdf

■/etc/cups/cups-pdf.conf
...
### Key: Out (config)
##  CUPS-PDF output directory 
##  special qualifiers: 
##     ${HOME} will be expanded to the user's home directory
##     ${USER} will be expanded to the user name
##  in case it is an NFS export make sure it is exported without
##  root_squash!
##  on Ubuntu, the cupsd AppArmor profile needs to be updated
##  to match the output path as per instructions in LP:147551
### Default: /var/spool/cups-pdf/${USER}

Out${HOME}
...
 ### Key: GSCall (config)
 ## command line for calling GhostScript (!!! DO NOT USE NEWLINES !!!)
 ## MacOSX: for using pstopdf set this to %s %s -o %s %s
 ### Default: %s -q -dCompatibilityLevel=%s -dNOPAUSE -dBATCH -dSAFER -sDEVICE=pdfwrite -sOutputFile="%s" -dAutoRotatePages=/PageByPage -dAutoFilterColorImages=false -dColorImageFilter=/FlateEncode -dPDFSETTINGS=/prepress -c .setpdfwrite -f %s 
GSCall /usr/local/bin/cups-pdf-common %s %s "%s" %s 
 ...

■/usr/local/bin/cups-pdf-common
#!/bin/bash
export MY_GS=$1
export MY_VER=$2
HOME=$(dirname "$3")
USER=$(basename ${HOME})
export MY_IN=$4
export MY_OUT=$(basename "$3")

execpath=~/bin/cups-pdf
if [ -f ${execpath} ]
then
	${execpath}
fi

■~/bin/cups-pdf
#!/bin/bash

#Ps2PDF
${MY_GS} -q -dCompatibilityLevel=${MY_VER} -dNOPAUSE -dBATCH -dSAFER -sDEVICE=pdfwrite -sOutputFile="${HOME}/PDF/$(date +%Y%m%d_%H%M%S.%N)_${MY_OUT}" -dAutoRotatePages=/PageByPage -dAutoFilterColorImages=false -dColorImageFilter=/FlateEncode -dPDFSETTINGS=/prepress -c .setpdfwrite -f ${MY_IN}
【2018/12/17 00:01 】 | Ubuntu | 有り難いご意見(3)
                                    
GRUB2をカスタマイズ
GRUB2でメニューの表示の仕方
※GRUB_HIDDEN_TIMEOUT_QUIETは関係ありません。

/etc/default/grub
GRUB_DEFAULT=0
GRUB_DISABLE_SUBMENU=y
GRUB_TIMEOUT_STYLE=menu
GRUB_TIMEOUT=3
【2018/12/10 21:27 】 | grub | 有り難いご意見(0)
                                    
レスキューディスクでのリカバリ
リカバリの仕方
# mount -t /dev/mapper/VG-LV root
# mount --bind /dev root/dev
# mount -t tmpfs tmpfs root/run
# mount -t proc proc root/proc
# mount -t sysfs sysfs root/sys
# chroot root
■参考文献 http://www.linuxfromscratch.org/lfs/view/stable-systemd/chapter06/kernfs.html
【2018/12/10 21:23 】 | linux | 有り難いご意見(0)
                                    
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