我們最近更新了 LDAP 主機上的 CA 憑證。有幾台 CentOS 5.x 伺服器在針對 LDAP 主機進行身份驗證時似乎沒有任何問題，但有一台 Centos 6.6 伺服器則無法做到這一點。我不知道伺服器最初是如何配置的，系統管理員離開時也沒有留下太多文件。 ldapsearch 用戶端似乎可以正常運作，沒有任何問題。當我使用最詳細的偵錯輸出來執行 ldapsearch 時，我沒有看到任何錯誤：
$ ldapsearch -h ldap.hostname.com -x -LLL -v -d 167 -s base -b "" 2>&1 | grep -i error
res_errno: 0, res_error: <>, res_matched: <>
res_errno: 0, res_error: <>, res_matched: <>
以下是該實用程式的輸出openssl s_client：
$ openssl s_client -connect ldap.hostname.com:636 < /dev/null
CONNECTED(00000003)
depth=3 C = SE, O = AddTrust AB, OU = AddTrust External TTP Network, CN = AddTrust External CA Root
verify return:1
depth=2 C = US, ST = New Jersey, L = Jersey City, O = The USERTRUST Network, CN = USERTrust RSA Certification Authority
verify return:1
depth=1 C = US, ST = MI, L = Ann Arbor, O = Internet2, OU = InCommon, CN = InCommon RSA Server CA
verify return:1
depth=0 C = , postalCode = , ST = , L = , street = , O = , OU = , CN = ldap.hostname.com
verify return:1
---
Certificate chain
0 s:/C=US/postalCode=/ST=/L=/street=/OU=/CN=ldap.hostname.com
i:/C=US/ST=MI/L=Ann Arbor/O=Internet2/OU=InCommon/CN=InCommon RSA Server CA
1 s:/C=US/ST=MI/L=Ann Arbor/O=Internet2/OU=InCommon/CN=InCommon RSA Server CA
i:/C=US/ST=New Jersey/L=Jersey City/O=The USERTRUST Network/CN=USERTrust RSA Certification Authority
2 s:/C=US/ST=New Jersey/L=Jersey City/O=The USERTRUST Network/CN=USERTrust RSA Certification Authority
i:/C=SE/O=AddTrust AB/OU=AddTrust External TTP Network/CN=AddTrust External CA Root
3 s:/C=SE/O=AddTrust AB/OU=AddTrust External TTP Network/CN=AddTrust External CA Root
i:/C=SE/O=AddTrust AB/OU=AddTrust External TTP Network/CN=AddTrust External CA Root
---
Server certificate
-----BEGIN CERTIFICATE-----
[...]
-----END CERTIFICATE-----
subject=/C=/postalCode=/ST=/L=/street=/O=/OU=/CN=ldap.hostname.com
issuer=/C=US/ST=MI/L=Ann Arbor/O=Internet2/OU=InCommon/CN=InCommon RSA Server CA
---
No client certificate CA names sent
---
SSL handshake has read 5715 bytes and written 607 bytes
---
New, TLSv1/SSLv3, Cipher is AES256-SHA256
Server public key is 2048 bit
Secure Renegotiation IS supported
Compression: NONE
Expansion: NONE
SSL-Session:
Protocol : TLSv1.2
Cipher : AES256-SHA256
Session-ID: [...]
Session-ID-ctx:
Master-Key: [...]
Key-Arg : None
Krb5 Principal: None
PSK identity: None
PSK identity hint: None
Start Time: [...]
Timeout : 300 (sec)
Verify return code: 0 (ok)
---
DONE
當我在偵錯模式下執行 nslcd 時，發現以下錯誤：
$ sudo nslcd -d -d -d 2>&1 > nslcd.log
$ cat nslcd.log | grep -i error
res_errno: 0, res_error: <>, res_matched: <>
TLS: cannot open certdb '/etc/openldap/cacerts', error -8018:Unknown PKCS #11 error.
TLS: certificate [...] is not valid - error -8172:Peer's certificate issuer has been marked as not trusted by the user..
TLS: error: connect - force handshake failure: errno 0 - moznss error -8172
TLS: can't connect: TLS error -8172:Peer's certificate issuer has been marked as not trusted by the user..
nslcd: [8b4567] ldap_start_tls_s() failed: Connect error (uri="ldap://ldap.hostname.com/")
nslcd: [8b4567] failed to bind to LDAP server ldap://ldap.hostname.com/: Connect error
res_errno: 0, res_error: <>, res_matched: <>
[...]
以下是 的內容/etc/ldap.conf：
base o=org
timelimit 120
bind_timelimit 120
idle_timelimit 3600
nss_initgroups_ignoreusers root,ldap,named,avahi,haldaemon,dbus,radvd,tomcat,radiusd,news,mailman,nscd,gdm
nss_map_attribute uniqueMember member
nss_base_passwd ou=People,?one
nss_base_group ou=Group,?one
tls_cert
tls_key
uri ldap://ldap.hostname.com
ssl start_tls
TLS_CACERTDIR /etc/openldap/certs
pam_password md5
SUDOERS_BASE ou=SUDOers,o=org
以下是 的內容/etc/openldap/ldap.conf：
TLS_CACERTDIR /etc/openldap/certs
URI ldap://ldap.hostname.com/
BASE o=org
以下是以下內容/etc/nslcd.conf：
uid nslcd
gid ldap
uri ldap://ldap.hostname.com/
base o=org
ssl start_tls
tls_cacertdir /etc/openldap/cacerts
tls_cacertfile /etc/openldap/cacerts/authconfig_downloaded.pem
我已經在 google 上搜尋了錯誤訊息，但我對在網路上找到的所有不同 LDAP 文件感到有點不知所措。任何建議將不勝感激。
答案1
對於從版本 6 開始的 rhel 和衍生產品，您使用 update-ca-trust （man 8 update-ca-trust 以了解所有詳細資訊）。裡面有很多資訊https://www.happyassassin.net/2015/01/14/trusting-additional-cas-in-fedora-rhel-centos-dont-append-to-etcpkitlscertsca-bundle-crt-or-etcpkitlscert-pem/
基本上，您將 PEM 格式的 ca 檔案放在 /etc/pki/ca-trust/source/anchors/ 中，並以 root update-ca-trust 身分執行；如果它是擴展可信任憑證格式，那麼您應該將其放在 /etc/pki/ca-trust/source 中，並再次更新-ca-trust。
o，且在 centos 6 中不鼓勵執行 nslcd。 sssd 在快取資訊等方面做得更好。