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Setup OpenLDAP client server with SSH access
#!/bin/bash
# vim: softtabstop=4 shiftwidth=4 expandtab fenc=utf-8 spell spelllang=en cc=120
set -e
# Check Ubuntu release
[ "$(lsb_release -sc)" = "trusty" ] || {
echo 'This script should be run on Ubuntu 14.04.' >&2
exit 1
}
# LDAP group name of team members to be granted access on this server,
LDAP_TEAM_NAME=$1
LDAP_BASE="dc=example,dc=com"
LDAP_URI="ldaps://ldap.example.com"
LDAP_BINDDN="cn=OpenLDAP Client,ou=users,dc=example,dc=com"
LDAP_BINDPW="password"
USAGE="usage: ./$(basename $0) LDAP_TEAM_NAME"
# Check required positional parameters
[ $# -ne 1 ] && {
echo "$USAGE" >&2
exit 1
}
# Install required packages
export DEBIAN_FRONTEND=noninteractive
# The following command will implicitly install libnss-ldap
apt-get -y install libpam-ldap nscd ldap-utils
apt-get -y install python-pip python-ldap
pip install ssh-ldap-pubkey
# Configure SSH server
grep 'AuthorizedKeysCommand' /etc/ssh/sshd_config > /dev/null || {
cat >> /etc/ssh/sshd_config <<EOF
AuthorizedKeysCommand /usr/local/bin/ssh-ldap-pubkey-wrapper
AuthorizedKeysCommandUser nobody
EOF
}
# Restart SSH server
service ssh restart
# Edit /etc/ldap.conf
mv /etc/ldap.conf /etc/ldap.conf.bak
cat > /etc/ldap.conf <<EOF
base $LDAP_BASE
uri $LDAP_URI
ldap_version 3
binddn $LDAP_BINDDN
bindpw $LDAP_BINDPW
pam_password md5
nss_initgroups_ignoreusers backup,bin,daemon,games,gnats,irc,landscape,libuuid,list,lp,mail,man,messagebus,news,pollinate,proxy,root,sshd,sync,sys,syslog,uucp,www-data
bind_timelimit 3
timelimit 3
EOF
# Edit /etc/ldap/ldap.conf
cp /etc/ldap/ldap.conf /etc/ldap/ldap.conf.bak
grep 'TLS_REQCERT' /etc/ldap/ldap.conf > /dev/null || {
cat >> /etc/ldap/ldap.conf <<EOF
TLS_REQCERT never
EOF
}
# Configure PAM
# Add pam_access.so
grep 'pam_access.so' /etc/pam.d/common-auth > /dev/null || {
cat >> /etc/pam.d/common-auth <<EOF
account required pam_access.so
EOF
}
# Remove use_authtok from /etc/pam.d/common-password
sed -i -r 's/(.*)(use_authtok)(.*)/\1\3/g' /etc/pam.d/common-password
# Add pam_mkhomedir.so
grep 'pam_mkhomedir.so' /etc/pam.d/common-session > /dev/null || {
cat >> /etc/pam.d/common-session <<EOF
session required pam_mkhomedir.so skel=/etc/skel umask=0022
EOF
}
# Configure NSS
sed -i -r 's/(^passwd:)(\s+)(.*)/\1\2compat ldap/' /etc/nsswitch.conf
sed -i -r 's/(^group:)(\s+)(.*)/\1\2compat ldap/' /etc/nsswitch.conf
sed -i -r 's/(^shadow:)(\s+)(.*)/\1\2compat ldap/' /etc/nsswitch.conf
# Edit /etc/security/access.conf
grep -- '^- : ALL EXCEPT root' /etc/security/access.conf > /dev/null || {
cat >> /etc/security/access.conf <<EOF
+ : ($LDAP_TEAM_NAME) : ALL
- : ALL EXCEPT root (admin) (wheel) : ALL EXCEPT LOCAL
EOF
}
# Edit /etc/sudoers
grep -F -- "%$LDAP_TEAM_NAME" /etc/sudoers > /dev/null || {
cat >> /etc/sudoers <<EOF
%$LDAP_TEAM_NAME ALL=(ALL) ALL
EOF
}
# Restart nscd
service nscd restart
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@ManUnit ManUnit commented Sep 7, 2021

I got Error show as below :

tail -f /var/log/auth.log
Sep 8 03:09:57 TBP-NAT-145 sshd[12240]: User damri from 127.0.0.1 not allowed because not listed in AllowUsers
Sep 8 03:10:03 TBP-NAT-145 sshd[12240]: pam_ldap: error trying to bind (Invalid credentials)
Sep 8 03:10:03 TBP-NAT-145 sshd[12240]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=127.0.0.1 user=damri
Sep 8 03:10:03 TBP-NAT-145 sshd[12240]: pam_ldap: error trying to bind (Invalid credentials)
Sep 8 03:10:03 TBP-NAT-145 sshd[12240]: Failed password for invalid user damri from 127.0.0.1 port 36276 ssh2
Sep 8 03:10:07 TBP-NAT-145 sshd[12240]: message repeated 2 times: [ Failed password for invalid user damri from 127.0.0.1 port 36276 ssh2]
Sep 8 03:10:07 TBP-NAT-145 sshd[12240]: Connection closed by invalid user damri 127.0.0.1 port 36276 [preauth]
Sep 8 03:14:32 TBP-NAT-145 sshd[12176]: Received signal 15; terminating.
Sep 8 03:14:32 TBP-NAT-145 sshd[12348]: Server listening on 0.0.0.0 port 1112.
Sep 8 03:14:32 TBP-NAT-145 sshd[12348]: Server listening on :: port 1112.

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@ManUnit ManUnit commented Sep 7, 2021

#ssh damri@0 -p 1112 -vvvvvvvvvvv

OpenSSH_7.6p1 Ubuntu-4ubuntu0.3, OpenSSL 1.0.2n 7 Dec 2017
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug2: resolving "0" port 1112
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to 0 [0.0.0.0] port 1112.
debug1: Connection established.
debug1: permanently_set_uid: 0/0
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_rsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/.ssh/id_ed25519-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_7.6p1 Ubuntu-4ubuntu0.3
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.6p1 Ubuntu-4ubuntu0.3
debug1: match: OpenSSH_7.6p1 Ubuntu-4ubuntu0.3 pat OpenSSH* compat 0x04000000
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to 0:1112 as 'damri'
debug3: put_host_port: [0]:1112
debug3: hostkeys_foreach: reading file "/root/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /root/.ssh/known_hosts:2
debug3: load_hostkeys: loaded 1 keys from [0]:1112
debug3: order_hostkeyalgs: prefer hostkeyalgs: ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
debug3: send packet: type 20
debug1: SSH2_MSG_KEXINIT sent
debug3: receive packet: type 20
debug1: SSH2_MSG_KEXINIT received
debug2: local client KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,ext-info-c
debug2: host key algorithms: ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
debug2: MACs ctos: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,zlib@openssh.com,zlib
debug2: compression stoc: none,zlib@openssh.com,zlib
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug2: peer server KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1
debug2: host key algorithms: ssh-rsa,rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp256,ssh-ed25519
debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
debug2: MACs ctos: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,zlib@openssh.com
debug2: compression stoc: none,zlib@openssh.com
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: chacha20-poly1305@openssh.com MAC: compression: none
debug1: kex: client->server cipher: chacha20-poly1305@openssh.com MAC: compression: none
debug3: send packet: type 30
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug3: receive packet: type 31
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:snBA/mctW9WumEzVwt8v1eA4kds+++8SAupxR8A12cE
debug3: put_host_port: [0.0.0.0]:1112
debug3: put_host_port: [0]:1112
debug3: hostkeys_foreach: reading file "/root/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /root/.ssh/known_hosts:2
debug3: load_hostkeys: loaded 1 keys from [0]:1112
debug3: hostkeys_foreach: reading file "/root/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /root/.ssh/known_hosts:3
debug3: load_hostkeys: loaded 1 keys from [0.0.0.0]:1112
debug1: Host '[0]:1112' is known and matches the ECDSA host key.
debug1: Found key in /root/.ssh/known_hosts:2
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug3: receive packet: type 21
debug1: SSH2_MSG_NEWKEYS received
debug2: set_newkeys: mode 0
debug1: rekey after 134217728 blocks
debug2: key: /root/.ssh/id_rsa ((nil))
debug2: key: /root/.ssh/id_dsa ((nil))
debug2: key: /root/.ssh/id_ecdsa ((nil))
debug2: key: /root/.ssh/id_ed25519 ((nil))
debug3: send packet: type 5
debug3: receive packet: type 7
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<ssh-ed25519,ssh-rsa,rsa-sha2-256,rsa-sha2-512,ssh-dss,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521>
debug3: receive packet: type 6
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug3: send packet: type 50
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey,password
debug3: start over, passed a different list publickey,password
debug3: preferred gssapi-keyex,gssapi-with-mic,publickey,keyboard-interactive,password
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Trying private key: /root/.ssh/id_rsa
debug3: no such identity: /root/.ssh/id_rsa: No such file or directory
debug1: Trying private key: /root/.ssh/id_dsa
debug3: no such identity: /root/.ssh/id_dsa: No such file or directory
debug1: Trying private key: /root/.ssh/id_ecdsa
debug3: no such identity: /root/.ssh/id_ecdsa: No such file or directory
debug1: Trying private key: /root/.ssh/id_ed25519
debug3: no such identity: /root/.ssh/id_ed25519: No such file or directory
debug2: we did not send a packet, disable method
debug3: authmethod_lookup password
debug3: remaining preferred: ,password
debug3: authmethod_is_enabled password
debug1: Next authentication method: password
damri@0's password:
debug3: send packet: type 50
debug2: we sent a password packet, wait for reply
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey,password
Permission denied, please try again.
damri@0's password:
debug3: send packet: type 50
debug2: we sent a password packet, wait for reply
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey,password
Permission denied, please try again.
damri@0's password:
debug3: send packet: type 50
debug2: we sent a password packet, wait for reply
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey,password
debug2: we did not send a packet, disable method
debug1: No more authentication methods to try.
damri@0: Permission denied (publickey,password).

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