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86 lines
2.8 KiB
Bash
86 lines
2.8 KiB
Bash
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### Linux radius client
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# Notes:
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For user authentication to a radius server,
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linux need the local user exist. The pam-radius
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module not create the local user automatically.
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To create the local user automatically:
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Enable the pam-radius module.
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Enable rsyslog and cron.
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The user try to login the first time.
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The the ssh daemon log the incident.
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Cron execute a script every minute:
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Read the log file and find the username.
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Verify the existence of the user with the radius server.
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Create the local user.
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The user can login now.
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# Install libpam-radius-auth and radius-utils
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apt-get install libpam-radius-auth freeradius-utils
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# Edit /etc/pam_radius_auth.conf
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Add the radius server:
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SERVER_IP_ADDRESS PRESHARED-KEY TIMEOUT
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# Edit /etc/pam.d/sshd
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# Edit /etc/pam.d/sudo
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First line add:
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auth sufficient pam_radius_auth.so
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# Edit /etc/ssh/sshd_config
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Change:
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SyslogFacility LOCAL6
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LogLevel INFO
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# Edit /etc/rsyslog.conf
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Add:
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local6.* -/var/log/sshd.log
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# Enable rsyslog and cron
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systemctl enable rsyslog.service
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systemctl enable cron.service
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# Add the radius group
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addgroup --system radius
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# Create the base dir for homes
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mkdir /radius
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chmod 755 /radius
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# Create the script /usr/local/bin/userradius.sh
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Change RADIUSIP and RADIUSPSK
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#!/bin/bash
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RADIUSIP='RADIUS_IP_ADDR'
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RADIUSPSK='RADIUS_PASSWORD'
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SSHLOG='/var/log/sshd.log'
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PATH='/usr/sbin:/usr/bin:/sbin:/bin'
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DIRHME='/radius'
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LOGFILE='/var/log/radius.log'
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if [ -s "$SSHLOG" ]; then
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DNOW=`date '+%d/%m/%Y %H:%M:%S'`
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cat "$SSHLOG" | grep 'input_userauth_request' | sed -e 's/invalid user /|/' -e 's/ \[preauth\]/|/' | cut -d '|' -f 2 | tr '[A-Z]' '[a-z]' | tr -d '[:blank:]' | sort | uniq | while read NAMEUSR; do
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VALIDATE=`radtest "$NAMEUSR" 'DUMMYPASS' "$RADIUSIP" '1812' "$RADIUSPSK" 2> /dev/null | grep 'Bad Encrypted password'`
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if [ ! -z "$VALIDATE" ]; then
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if [ ! -d "${DIRHME}/${NAMEUSR}" ]; then
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VALIDATE=`cat /etc/passwd | grep ^${NAMEUSR}`
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if [ -z "$VALIDATE" ]; then
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useradd -d "${DIRHME}/${NAMEUSR}" -g 'radius' -m -N -s '/bin/bash' "$NAMEUSR"
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chmod 700 "${DIRHME}/${NAMEUSR}"
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echo "${DNOW} - NAMEUSR creado: $NAMEUSR" >> "$LOGFILE"
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chmod 600 "$LOGFILE"
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fi
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fi
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fi
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done
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truncate -s 0 "$SSHLOG"
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fi
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# Make script executable
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chmod 750 /usr/local/bin/userradius.sh
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# Add the script to /etc/crontab
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* * * * * root /usr/local/bin/userradius.sh > /dev/null 2> /dev/null
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# Reboot
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