在supportedSASLMechanisms中将GSSAPI添加到OpenLdap

Question

我正在寻找如何将 GSSAPI 支持添加到我的 OpenLDAP 中？

当前设置

MIT Kerberos V + OpenLDAP
Kerberos bind to openldap
Able to issue kerberos tickets to my users (with kinit exampluser)
Able to ldapsearch -x uid=exampluser

OpenLDAP 端

server% ldapsearch -x -H ldapi:/// -b "" -LLL -s base -Z supportedSASLMechanisms

    ldap_start_tls: Protocol error (2)
    additional info: unsupported extended operation
dn:
supportedSASLMechanisms: DIGEST-MD5
supportedSASLMechanisms: EXTERNAL
supportedSASLMechanisms: CRAM-MD5
supportedSASLMechanisms: NTLM
supportedSASLMechanisms: LOGIN
supportedSASLMechanisms: PLAIN

客户端

client% ldapsearch uid=exampleuser

SASL/GSSAPI authentication started
ldap_sasl_interactive_bind_s: Authentication method not supported (7)
    additional info: SASL(-4): no mechanism available: Couldn't find mech GSSAPI

客户端ldap.conf

#
# LDAP Defaults
#

# See ldap.conf(5) for details
# This file should be world readable but not world writable.

BASE        dc=example,dc=com
URI         ldap://ldap.example.com
SASL_MECH   GSSAPI

显然，该错误足以说明我的 ldap 请求没有找到进行身份验证的机制。

我已经阅读了许多教程和解释，但仍然找不到如何“添加”该机制的任何地方。

谢谢什么是 SASL/GSSAPI？对于所有令人敬畏的解释。

为用户 473183469 更新

我已经为 ldap 生成了一个密钥表，我已将其复制到/etc/ldap/ldap.keytab 中，并根据https://help.ubuntu.com/community/SingleSignOn编辑了/etc/default/slapd要求取消注释并给出导出路径KRB5_KTNAME=/etc/ldap/ldap.keytab

那个 ldap keytab 是这样生成的

kadmin: addprinc -randkey ldap/ldap.example.com@EXAMPLE.COM
kadmin: ktadd -k ~/ldap.keytab ldap/ldap.example.com@EXAMPLE.COM

我还有一个在安装开始时创建的 /etc/krb5.keytab

kadmin.local:  listprincs
admin@EXAMPLE.COM
K/M@EXAMPLE.COM
krbtgt/EXAMPLE.COM@EXAMPLE.COM
kadmin/admin@EXAMPLE.COM
kadmin/changepw@EXAMPLE.COM
kadmin/history@EXAMPLE.COM
kadmin/kdc.example.com@EXAMPLE.COM
user1@example.com (also in the ldap, can issue a ticket and everything)
user2@example.com (same for him)
ldap/ldap.example.com@EXAMPLE.COM

ktutil 结果

# ktutil
ktutil:  read_kt /etc/ldap.keytab
ktutil:  list
slot KVNO Principal
---- ---- ---------------------------------------------------------------------
   1    2            ldap/ldap.example.com@EXAMPLE.COM
   2    2            ldap/ldap.example.com@EXAMPLE.COM
   3    2            ldap/ldap.example.com@EXAMPLE.COM
   4    2            ldap/ldap.example.com@EXAMPLE.COM
ktutil:  read_kt /etc/krb5.keytab
ktutil:  list
slot KVNO Principal
---- ---- ---------------------------------------------------------------------
   1    2            ldap/ldap.example.com@EXAMPLE.COM
   2    2            ldap/ldap.example.com@EXAMPLE.COM
   3    2            ldap/ldap.example.com@EXAMPLE.COM
   4    2            ldap/ldap.example.com@EXAMPLE.COM
   5    2           kadmin/kdc.example.com@EXAMPLE.COM
   6    2           kadmin/kdc.example.com@EXAMPLE.COM
   7    2           kadmin/kdc.example.com@EXAMPLE.COM
   8    2           kadmin/kdc.example.com@EXAMPLE.COM

Answer 1

解决了

我失踪了SASL_MECH GSSAPI并且SASL_REAM在/etc/ldap/ldap.conf

[Tue Feb 28 13:48 root:ldap] [~] # cat /etc/ldap/ldap.conf
#
# LDAP Defaults
#

# See ldap.conf(5) for details
# This file should be world readable but not world writable.

BASE    dc=example,dc=com
URI ldap://ldap.example.com    
SASL_MECH GSSAPI
SASL_REALM EXAMPLE.COM

现在我可以直接使用 kerberos 票证 ldapsearch uid=user 并获取

SASL/GSSAPI authentication started
SASL username: user@EXAMPLE.COM
SASL SSF: 112
SASL data security layer installed.
# extended LDIF
#
# LDAPv3
# base <dc=example,dc=com> (default) with scope subtree
# filter: uid=user
# requesting: ALL
#

当然，如果我没有 kerberos 票证（这是有道理的）

client% ldapsearch uid=gleger
SASL/GSSAPI authentication started
ldap_sasl_interactive_bind_s: Local error (-2)
    additional info: SASL(-1): generic failure: GSSAPI Error:  Miscellaneous failure (see text (No credentials cache file found)