125 lines
4.5 KiB
Text
125 lines
4.5 KiB
Text
After Debian/Ubuntu upgrade, merge local config files according to config files shipped in packages.
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```
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for file in $(find /etc -iname '*.dpkg-dist'); do vimdiff ${file%%.dpkg-dist} $file; done
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for file in $(find /etc -iname '*.ucf-dist'); do vimdiff ${file%%.ucf-dist} $file; done
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```
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Debug php with strace and php-cgi (especially useful for wp multisites).
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```
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HTTP_HOST=www.site.com SCRIPT_FILENAME=index.php REDIRECT_STATUS=CGI SERVER_NAME=www.site.com strace -s 65535 -o /tmp/strace php-cgi -f index.php
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```
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```ps``` with long user fields (here 20).
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```
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ps axo user:20,pid,pcpu,pmem,vsz,rss,tty,stat,start,time,comm
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```
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WTF is happening in apache (or other)? Let's strace all apache processes.
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```
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# strace -p $(ps auwwwx | grep apache | tr -s '\t' ' ' | cut -d' ' -f2 | tr '\n' ' ' | sed 's/ / -p /g') -p 9999
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```
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WTF is happening? Let's tail all logs.
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```
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# tail -f $(lsof | grep -F .log | tr -s '\t' ' ' | cut -d' ' -f10 | sort | uniq | tr -s '\n' ' ')
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```
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Search for suspects POST in apache.log (often attacks).
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```{.bash}
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grep -Eo '"POST .*.php' access.log | grep -ve cron -e login -e admin -e xmlrpc -e trackback -e comment -e 404 | sort -u
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```
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Check for crashed MySQL table in syslog and launch a repair.
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```{.bash}
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#!/bin/bash
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tables=$(grep crashed /var/log/syslog | grep -Eo \'\./.*\' --color=auto | sed s#\'./## | sed s#\'## | uniq | tr -s '\n' ' ')
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for tableC in $tables; do
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db=${tableC%/*}
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table=${tableC#*/}
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mysqlcheck --auto-repair --check $db $table
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done
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```
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Get the groups of an user and add another user into these groups.
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```{.bash}
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for group in $(grep user1 /etc/group | cut -d':' -f1 | sed '/user1/d'); do adduser user2 $group; done
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```
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Get the last acceded URLs in Squid Access list.
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```{.bash}
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tail -n100 /var/log/squid3/access.log | grep -oE 'http.*' | cut -d ' ' -f1 | sort | uniq
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```
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Migrate MySQL users.
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```{.bash}
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# SRC Server
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mysql mysql -e "select * from user WHERE USER='user1' OR USER='user2' INTO OUTFILE '/tmp/mysql_user';"
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mysql mysql -e "select * from db WHERE USER='user1' OR USER='user2' INTO OUTFILE '/tmp/mysql_db';"
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# DST Server
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scp server:/tmp/mysql_{db,user} /tmp
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chmod 664 /tmp/mysql_{db,user}
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mysql mysql -e "LOAD DATA INFILE '/tmp/mysql_user' INTO TABLE user;"
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mysql mysql -e "LOAD DATA INFILE '/tmp/mysql_db' INTO TABLE db;"
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```
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Find userid of mails in mailq.
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```{.bash}
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for i in $(mailq | grep -Eo [A-F0-9]{10} | tr -s '\n' ' '); do postcat -q $i | grep userid | grep -Eo "[0-9]{4,}" >> tmp/userid; done
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sort -n /tmp/userid | uniq
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```
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Kill every MySQL SELECT older than X seconds – Original: https://anothersysadmin.wordpress.com/2008/10/29/kill-every-mysql-select-older-than-x-seconds/
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```{.bash}
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#!/bin/bash
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# From https://anothersysadmin.wordpress.com/2008/10/29/kill-every-mysql-select-older-than-x-seconds/
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SEC=$1
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IFS='|'
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if [[ $SEC -lt 1 ]]; then
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echo "Usage: $0 SECONDS"
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exit 1
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fi
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mysqladmin proc -v|grep Query|grep -Evi "delete|update|insert|alter table" |while read dummy qid qusr qhost qdb qstat qsec qstat2 query; do
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if [ $qsec -gt $SEC ]; then
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echo "Killing query $qid..."
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mysqladmin kill $qid
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fi
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done
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```
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List of contacts when sending a mail for technical purpose on a domain which doesn't announce their technical contacts in a whois.
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```
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abuse@<domain>, admin@<domain>, administrator@<domain>, contact@<domain>, info@<domain>, postmaster@<domain>, support@<domain>, webmaster@<domain>
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```
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itk change rights.
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```{.bash}
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find /tmp/ -user www-user.old -exec chown www-user:user {} \;
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find /tmp/ -user user.old -exec chown user:user {} \;
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* Détecter les fichiers non lisibles par Apache (lecture sur le groupe) : find ./ -type f ! -perm /g=r -exec ls -l {} \;
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* Détecter les répertoires non lisibles par Apache (lecture/exécution sur le groupe) : find ./ -type d \( ! -perm /g=r -o ! -perm /g=x \) -exec ls -ld {} \;
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* Détecter les fichiers/répertoires accessibles en écriture par Apache (écriture sur le groupe) : find ./ -perm /g=w
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* Détecter les fichiers/répertoires accessibles en écriture par tous : find ./ -perm -007 -o -type f -perm -006
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```
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Get useradd command for migrating account.
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```{.bash}
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for i in user1 user2 user3...; do echo -n 'useradd -m -s /bin/bash -u '$(grep -E "^$i" /etc/passwd | cut -d':' -f3) && echo -en ' -p' \'$(grep -E "^$i" /etc/shadow | cut -d ':' -f2)\' $i '\n'; done
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Output :
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useradd -m -s /bin/bash -u USERID -p 'USERPWD' username
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```
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Find files newert than (mtime) a precise date, and execute an action.
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```{.bash}
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find . ! -newermt '2012-09-19 11:40:00' -exec cp {} /tmp/mails \;
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```
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