#!/bin/sh

if [ $(id -u) -ne 0 ]; then
 echo -e "\n\e[1;31mYou must be root\e[1;32m!\e[0m\n"
  else

declare USERNAME="usuario"

declare SLACKWARE_VERSION="$(sed '1q' /etc/slackware-version | sed 's/\s//g;' | tr 'A-Z' 'a-z')"

declare PYTHON="$(which python{,2.7,3,3.5,3.6,3.8,3.9} 2>/dev/null | tail -1)"

for ((i=1; i < 4; i++)); do

  if [ -n "$(getent passwd ${USERNAME}${i})" ]; then
   echo -e "\n\e[1;31mUser \e[1;34m${USERNAME}${i}\e[1;31m exists\e[1;32m!\e[0m"
    exit 0
    else

    #Cria o grupo sudo se nao existir
    [ -z $(getent group sudo) ] && groupadd sudo
    
    #Senhas randomicas com até 10 caracteres
    PASSWORDS="$(tr -dc a-z0-9_@%*A-Z0-9 < /dev/urandom | head -c 10)"

    #Saltos randomicos para criptografar a senha
    SALT_PASSWD="$(tr -dc _a-z-A-Z-0-9@%* < /dev/urandom | head -c 18)"
    
    #Criptografa a senha com algoritmo SHA-512
    CRYPT_PASSWD="$(${PYTHON} -c "import crypt; print(crypt.crypt('${PASSWORDS}', '\$6\$${SALT_PASSWD}\$'))")"
    
    #Cria o usuario com a senha criptografada
    useradd -m ${USERNAME}${i} -p ${CRYPT_PASSWD} -s /bin/bash -G disk,lp,kmem,floppy,dialout,audio,video,cdrom,games,input,plugdev,power,netdev,scanner,sudo

    #Salva os usuarios criados no diretório /root com o nome slackware15.0-logins
    [ $? -eq 0 ] && echo -e "${i} - USUARIO: ${USERNAME}${i}\tSENHA: ${PASSWORDS}\n" >> ~/${SLACKWARE_VERSION}-logins

    [ $? -eq 0 ] && echo -e "\e[1;34mUser \e[1;31m\"\e[1;32m${USERNAME}${i}\e[1;31m\" \e[1;34msucessfully created\e[1;32m!\e[0m"

    # força que a senha seja trocada no primeiro login
    chage -d 0 ${USERNAME}${i}
  fi

done

fi

# login usuario1
Password:

diniz@darkstar:/mnt/slackmirror/slackware64-current/source$ ls -l
total 29284
-rw-r--r--   1 root root   620396 May 15 22:19 CHECKSUMS.md5
-rw-r--r--   1 root root      195 May 15 22:19 CHECKSUMS.md5.asc
...

diniz@darkstar:/mnt/slackmirror/slackware64-current/source$ gpg2 --verify CHECKSUMS.md5.asc CHECKSUMS.md5
gpg: Signature made Wed 15 May 2024 10:19:39 PM -03
gpg:                using DSA key EC5649DA401E22ABFA6736EF6A4463C040102233
gpg: Good signature from "Slackware Linux Project <security@slackware.com>" [ultimate]

diniz@darkstar:~$ vi file_created_by_bortolotto.txt
diniz@darkstar:~$ cat file_created_by_bortolotto.txt 
This file was created by Diniz Bortolotto.
diniz@darkstar:~$ gpg2 --armor --detach-sig file_created_by_bortolotto.txt 
diniz@darkstar:~$ cat file_created_by_bortolotto.txt.asc 
-----BEGIN PGP SIGNATURE-----
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=heCw
-----END PGP SIGNATURE-----
diniz@darkstar:~$ gpg2 --verify file_created_by_bortolotto.txt.asc file_created_by_bortolotto.txt
gpg: Signature made Fri 17 May 2024 12:38:30 AM -03
gpg:                using RSA key 3C161AFF8BD917A11DC4C19CA22DC995A423314D
gpg: Good signature from "Diniz Bortolotto <diniz.bortolotto@gmail.com>" [ultimate]
diniz@darkstar:~$

$ su - usuario1
Password:

$ ssh usuario1@localhost
(usuario1@localhost) Password:

useradd -m usuário -s /bin/bash

$ su -     
Password: 
# login
<bash gets killed>

#!/bin/sh

if [ $(id -u) -ne 0 ]; then
 echo -e "\n\e[1;31mYou must be root\e[1;32m!\e[0m\n"
  else

declare USERNAME="usuario"

declare SLACKWARE_VERSION="$(sed '1q' /etc/slackware-version | sed 's/\s//g;' | tr 'A-Z' 'a-z')"

declare PYTHON="$(which python{,2.7,3,3.5,3.6,3.8,3.9} 2>/dev/null | tail -1)"

for ((i=1; i < 4; i++)); do

  if [ -n "$(getent passwd ${USERNAME}${i})" ]; then
   echo -e "\n\e[1;31mUser \e[1;34m${USERNAME}${i}\e[1;31m exists\e[1;32m!\e[0m"
    exit 0
    else

    #Cria o grupo sudo se nao existir
    [ -z $(getent group sudo) ] && groupadd sudo
    
    #Senhas randomicas com até 10 caracteres
    PASSWORDS="$(tr -dc a-z0-9_@%*A-Z0-9 < /dev/urandom | head -c 10)"

    #Saltos randomicos para criptografar a senha
    SALT_PASSWD="$(tr -dc _a-z-A-Z-0-9@%* < /dev/urandom | head -c 18)"
    
    #Criptografa a senha com algoritmo SHA-512
    CRYPT_PASSWD="$(${PYTHON} -c "import crypt; print(crypt.crypt('${PASSWORDS}', '\$6\$${SALT_PASSWD}\$'))")"
    
    #Cria o usuario com a senha criptografada
    useradd -m ${USERNAME}${i} -p ${CRYPT_PASSWD} -s /bin/bash -G disk,lp,kmem,floppy,dialout,audio,video,cdrom,games,input,plugdev,power,netdev,scanner,sudo

    #Salva os usuarios criados no diretório /root com o nome slackware15.0-logins
    [ $? -eq 0 ] && echo -e "${i} - USUARIO: ${USERNAME}${i}\tSENHA: ${PASSWORDS}\n" >> ~/${SLACKWARE_VERSION}-logins

    [ $? -eq 0 ] && echo -e "\e[1;34mUser \e[1;31m\"\e[1;32m${USERNAME}${i}\e[1;31m\" \e[1;34msucessfully created\e[1;32m!\e[0m"

    # força que a senha seja trocada no primeiro login
    chage -d 0 ${USERNAME}${i}
  fi

done

fi

# cat ~/slackware15.0-logins

# login usuario1
Password: