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#!/bin/bash

DEPS=(pam acl audit libcap libxcrypt)

PKG_VER=4.11.1

SOURCE=https://github.com/shadow-maint/shadow/releases/download/v$PKG_VER/shadow-$PKG_VER.tar.xz
DESC="Password and account management tool suite with support for shadow files and PAM"

prepare () {

    sed -i 's/groups$(EXEEXT) //' src/Makefile.in
    find man -name Makefile.in -exec sed -i 's/groups\.1 / /'   {} \;
    find man -name Makefile.in -exec sed -i 's/getspnam\.3 / /' {} \;
    find man -name Makefile.in -exec sed -i 's/passwd\.5 / /'   {} \;

    sed -e 's:#ENCRYPT_METHOD DES:ENCRYPT_METHOD SHA512:' \
    -e 's:/var/spool/mail:/var/mail:'                 \
    -e '/PATH=/{s@/sbin:@@;s@/bin:@@}'                \
    -i etc/login.defs
    
    sed -e "224s/rounds/min_rounds/" -i libmisc/salt.c

    mkdir -p $PKG_DEST/usr/bin
    touch $PKG_DEST/usr/bin/passwd

}

build () {
    ./configure --sysconfdir=/etc --with-group-name-max-length=32
    make
}

package () {
    make exec_prefix=/usr DESTDIR=$PKG_DEST install
    make DESTDIR=$PKG_DEST -C man install-man
    mkdir -p $PKG_DEST/etc/default
}

postinstall () {
    install -v -m644 /etc/login.defs /etc/login.defs.orig &&
    for FUNCTION in FAIL_DELAY               \
                    FAILLOG_ENAB             \
                    LASTLOG_ENAB             \
                    MAIL_CHECK_ENAB          \
                    OBSCURE_CHECKS_ENAB      \
                    PORTTIME_CHECKS_ENAB     \
                    QUOTAS_ENAB              \
                    CONSOLE MOTD_FILE        \
                    FTMP_FILE NOLOGINS_FILE  \
                    ENV_HZ PASS_MIN_LEN      \
                    SU_WHEEL_ONLY            \
                    CRACKLIB_DICTPATH        \
                    PASS_CHANGE_TRIES        \
                    PASS_ALWAYS_WARN         \
                    CHFN_AUTH ENCRYPT_METHOD \
                    ENVIRON_FILE
    do
        sed -i "s/^${FUNCTION}/# &/" /etc/login.defs
    done

    cat > /etc/pam.d/login << "EOF"
# Begin /etc/pam.d/login

# Set failure delay before next prompt to 3 seconds
auth      optional    pam_faildelay.so  delay=3000000

# Check to make sure that the user is allowed to login
auth      requisite   pam_nologin.so

# Check to make sure that root is allowed to login
# Disabled by default. You will need to create /etc/securetty
# file for this module to function. See man 5 securetty.
#auth      required    pam_securetty.so

# Additional group memberships - disabled by default
#auth      optional    pam_group.so

# include system auth settings
auth      include     system-auth

# check access for the user
account   required    pam_access.so

# include system account settings
account   include     system-account

# Set default environment variables for the user
session   required    pam_env.so

# Set resource limits for the user
session   required    pam_limits.so

# Display date of last login - Disabled by default
#session   optional    pam_lastlog.so

# Display the message of the day - Disabled by default
#session   optional    pam_motd.so

# Check user's mail - Disabled by default
#session   optional    pam_mail.so      standard quiet

# include system session and password settings
session   include     system-session
password  include     system-password

# End /etc/pam.d/login
EOF

    cat > /etc/pam.d/passwd << "EOF"
# Begin /etc/pam.d/passwd

password  include     system-password

# End /etc/pam.d/passwd
EOF

    cat > /etc/pam.d/su << "EOF"
# Begin /etc/pam.d/su

# always allow root
auth      sufficient  pam_rootok.so

# Allow users in the wheel group to execute su without a password
# disabled by default
#auth      sufficient  pam_wheel.so trust use_uid

# include system auth settings
auth      include     system-auth

# limit su to users in the wheel group
auth      required    pam_wheel.so use_uid

# include system account settings
account   include     system-account

# Set default environment variables for the service user
session   required    pam_env.so

# include system session settings
session   include     system-session

# End /etc/pam.d/su
EOF

    cat > /etc/pam.d/chpasswd << "EOF"
# Begin /etc/pam.d/chpasswd

# always allow root
auth      sufficient  pam_rootok.so

# include system auth and account settings
auth      include     system-auth
account   include     system-account
password  include     system-password

# End /etc/pam.d/chpasswd
EOF

sed -e s/chpasswd/newusers/ /etc/pam.d/chpasswd >/etc/pam.d/newusers

    cat > /etc/pam.d/chage << "EOF"
# Begin /etc/pam.d/chage

# always allow root
auth      sufficient  pam_rootok.so

# include system auth and account settings
auth      include     system-auth
account   include     system-account

# End /etc/pam.d/chage
EOF

}