CentOS 7 上的 LDAP 身份验证

CentOS 7 上的 LDAP 身份验证

升级到 CentOS 7 后,无法再通过 LDAP 登录。在 CentOS 6 中,我使用了软件包pam_ldap一切运行正常,但现在 pam_ldap 不再适用于新版本的 CentOS。

通过连接ldap搜索仍然可以正常工作,但是尝试通过 ssh 进行身份验证不起作用。

我重新安装了该包nss-pam-ldapd并通过重新配置身份验证authconfig-tui,但它仍然不起作用。

下面我将我的用户名替换为用户名和基地dc=sub,dc=示例,dc=org

我的主机操作系统是 CentOS 7。所有当前可用的更新都已安装。

$ uname -a
Linux isfet 3.10.0-123.8.1.el7.x86_64 #1 SMP Mon Sep 22 19:06:58 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

已安装的软件包

$ rpm -qa | grep -i ldap
openldap-2.4.39-3.el7.x86_64
nss-pam-ldapd-0.8.13-8.el7.x86_64
openldap-clients-2.4.39-3.el7.x86_64

内容/etc/openldap/ldap.conf

URI ldap://172.16.64.25
BASE dc=sub,dc=example,dc=org

内容/etc/nslcd.conf

ldap_version 3
uri ldap://172.16.64.25
base dc=sub,dc=example,dc=org
ssl no

输出/var/log/安全

Oct  6 12:12:16 isfet sshd[3937]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=172.16.64.1  user=user.name
Oct  6 12:12:17 isfet sshd[3937]: Failed password for user.name from 172.16.64.1 port 18877 ssh2

输出/var/log/audit/audit.log

type=USER_AUTH msg=audit(1412590243.286:364): pid=3912 uid=0 auid=4294967295 ses=4294967295 msg='op=PAM:authentication acct="user.name" exe="/usr/sbin/sshd" hostname=172.16.64.1 addr=172.16.64.1 terminal=ssh res=failed'
type=USER_AUTH msg=audit(1412590243.287:365): pid=3912 uid=0 auid=4294967295 ses=4294967295 msg='op=password acct="user.name" exe="/usr/sbin/sshd" hostname=? addr=172.16.64.1 terminal=ssh res=failed'

命令的输出ldap搜索

$ ldapsearch -H ldap://172.16.64.25/ -D cn=Manager,dc=sub,dc=example,dc=org -W -x -b dc=sub,dc=example,dc=org -d1

ldap_url_parse_ext(ldap://172.16.64.25/)
ldap_create
ldap_url_parse_ext(ldap://172.16.64.25:389/??base)
Enter LDAP Password:
ldap_sasl_bind
ldap_send_initial_request
ldap_new_connection 1 1 0
ldap_int_open_connection
ldap_connect_to_host: TCP 172.16.64.25:389
ldap_new_socket: 3
ldap_prepare_socket: 3
ldap_connect_to_host: Trying 172.16.64.25:389
ldap_pvt_connect: fd: 3 tm: -1 async: 0
attempting to connect:
connect success
ldap_open_defconn: successful
ldap_send_server_request
ber_scanf fmt ({it) ber:
ber_scanf fmt ({i) ber:
ber_flush2: 61 bytes to sd 3
ldap_result ld 0x7f9b07402110 msgid 1
wait4msg ld 0x7f9b07402110 msgid 1 (infinite timeout)
wait4msg continue ld 0x7f9b07402110 msgid 1 all 1
** ld 0x7f9b07402110 Connections:
* host: 172.16.64.25  port: 389  (default)
  refcnt: 2  status: Connected
  last used: Mon Oct  6 12:04:38 2014


** ld 0x7f9b07402110 Outstanding Requests:
 * msgid 1,  origid 1, status InProgress
   outstanding referrals 0, parent count 0
  ld 0x7f9b07402110 request count 1 (abandoned 0)
** ld 0x7f9b07402110 Response Queue:
   Empty
  ld 0x7f9b07402110 response count 0
ldap_chkResponseList ld 0x7f9b07402110 msgid 1 all 1
ldap_chkResponseList returns ld 0x7f9b07402110 NULL
ldap_int_select
read1msg: ld 0x7f9b07402110 msgid 1 all 1
ber_get_next
ber_get_next: tag 0x30 len 50 contents:
read1msg: ld 0x7f9b07402110 msgid 1 message type bind
ber_scanf fmt ({eAA) ber:
read1msg: ld 0x7f9b07402110 0 new referrals
read1msg:  mark request completed, ld 0x7f9b07402110 msgid 1
request done: ld 0x7f9b07402110 msgid 1
res_errno: 0, res_error: <>, res_matched: <cn=Manager,dc=sub,dc=example,dc=org>
ldap_free_request (origid 1, msgid 1)
ldap_parse_result
ber_scanf fmt ({iAA) ber:
ber_scanf fmt (}) ber:
ldap_msgfree
ldap_err2string
ldap_bind: Success (0)
        matched DN: cn=Manager,dc=sub,dc=example,dc=org
...

_/etc/pam.d/password-auth 的内容

auth        required      pam_env.so
auth        sufficient    pam_unix.so nullok try_first_pass
auth        requisite     pam_succeed_if.so uid >= 1000 quiet_success
auth        sufficient    pam_ldap.so use_first_pass
auth        required      pam_deny.so

account     required      pam_unix.so broken_shadow
account     sufficient    pam_localuser.so
account     sufficient    pam_succeed_if.so uid < 1000 quiet
account     [default=bad success=ok user_unknown=ignore] pam_ldap.so
account     required      pam_permit.so

password    requisite     pam_pwquality.so try_first_pass retry=3 type=
password    sufficient    pam_unix.so sha512 shadow nullok try_first_pass use_authtok
password    sufficient    pam_ldap.so use_authtok
password    required      pam_deny.so

session     optional      pam_keyinit.so revoke
session     required      pam_limits.so
-session     optional      pam_systemd.so
session     [success=1 default=ignore] pam_succeed_if.so service in crond quiet use_uid
session     required      pam_unix.so
session     optional      pam_ldap.so

_/etc/pam.d/system-auth 的内容

auth        required      pam_env.so
auth        sufficient    pam_unix.so nullok try_first_pass
auth        requisite     pam_succeed_if.so uid >= 1000 quiet_success
auth        sufficient    pam_ldap.so use_first_pass
auth        required      pam_deny.so

account     required      pam_unix.so broken_shadow
account     sufficient    pam_localuser.so
account     sufficient    pam_succeed_if.so uid < 1000 quiet
account     [default=bad success=ok user_unknown=ignore] pam_ldap.so
account     required      pam_permit.so

password    requisite     pam_pwquality.so try_first_pass retry=3 type=
password    sufficient    pam_unix.so sha512 shadow nullok try_first_pass use_authtok
password    sufficient    pam_ldap.so use_authtok
password    required      pam_deny.so

session     optional      pam_keyinit.so revoke
session     required      pam_limits.so
-session     optional      pam_systemd.so
session     [success=1 default=ignore] pam_succeed_if.so service in crond quiet use_uid
session     required      pam_unix.so
session     optional      pam_ldap.so

答案1

跑步韓國在调试模式下显示问题:

$ $(which nslcd) -d
...
nslcd: [8b4567] <authc="user.name"> DEBUG: myldap_search(base="dc=sub,dc=example,dc=org", filter="(&(objectClass=posixAccount)(uid=user.name))")
...
nslcd: [8b4567] <authc="user.name"> DEBUG: ldap_result(): end of results (0 total)
nslcd: [8b4567] <authc="user.name"> DEBUG: "user.name": user not found: No such object
...

韓國默认设置过滤器。无法删除此过滤器或将其设置为空白。

因为我的 LDAP 用户都没有名为posix帐户找不到用户,登录被拒绝。

为了解决这个问题,我不得不用自己的过滤器覆盖这个过滤器。因为我正在寻找用户ID无论如何,在要搜索的属性上设置过滤器很有用。

我的新内容/etc/nslcd.conf

filter passwd (uid=*)
uri ldap://172.16.64.25
base dc=sub,dc=example,dc=org
ssl no

改变后nslcd配置文件我必须重新启动服务 nslcd:systemctl restart nslcd

来源: http://lists.arthurdejong.org/nss-pam-ldapd-users/2014/msg00025.html

这似乎是 CentOS 7 上 _nss-pam-ldapd-0.8.13-8.el7.x86_64_ 的一个问题!

$ nslcd -V
nss-pam-ldapd 0.8.13

我尝试在 CentOS 6 上重现该问题,但在此 nss-pam-ldapd 依赖于pam_ldap它的配置文件在 /etc/pam_ldap.conf 中,并且似乎不像在 CentOS 7 上那样使用 /etc/nslcd.conf。

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