为CUCM、IP电话和CUBE之间的SIP TLS和SRTP配置企业CA（第三方CA）签名证书并对其进行故障排除

简介

本文档介绍使用企业证书颁发机构(CA)（第三个）在思科统一通信管理器(CUCM)、IP电话和思科统一边界元素(CUBE)之间的会话发起协议(SIP)传输层安全(TLS)和安全实时传输协议(SRTP)的配置示例参与方CA)已签名的证书，并使用通用企业CA为所有网络组件（包括IP电话、CUCM、网关和CUBE等思科通信设备）签署证书。

先决条件

要求

Cisco 建议您了解以下主题：

• 企业CA服务器已配置
• CUCM集群配置为混合模式，IP电话注册为安全模式（加密）
• CUBE基本语音服务VoIP和拨号对等体配置已完成

使用的组件

本文档中的信息基于以下软件和硬件版本：

• Windows 2008服务器 — 证书颁发机构
• CUCM 10.5
• CUBE - 3925E，带Cisco IOS® 15.3(3)M3
• CIPC

本文档中的信息都是基于特定实验室环境中的设备编写的。本文档中使用的所有设备最初均采用原始（默认）配置。如果您使用的是真实网络，请确保您已经了解所有命令的潜在影响。

背景信息

CUBE上的安全语音通信可分为两部分

• 安全信令 — CUBE使用TLS保护SIP信令和互联网协议安全(IPSec)，以保护H.323上的信令
• 安全介质 — 安全实时传输协议(SRTP)

CUCM证书颁发机构代理功能(CAPF)为电话提供本地有效证书(LSC)。因此，当CAPF由外部CA签名时，它将充当电话的从属CA。

要了解如何获取CA签名的CAPF，请参阅：

配置

网络图

在此设置中，使用根CA和一个从属CA。所有CUCM和CUBE证书都由从属CA签名。

配置CUBE

生成RSA密钥对。

此步骤生成私钥和公钥。

在本例中，CUBE只是一个标签，它可以是任何内容。

CUBE-2(config)#crypto key generate rsa general-keys label CUBE modulus 2048
The name for the keys will be: CUBE
 
% The key modulus size is 2048 bits
% Generating 2048 bit RSA keys, keys will be non-exportable...
[OK] (elapsed time was 12 seconds)
 
CUBE-2(config)#

2.为从属CA和根CA创建信任点，从属CA信任点用于SIP TLS通信。

在本示例中，从属CA的信任点名称为SUBCA1，而根CA的信任点名称为ROOT。

enrollment terminal pem allow manual cut-and-paste certificate enrollment. pem keyword is used to issue certificate requests or receive issued certificates in PEM-formatted files through the console terminal.

此步骤中使用的主题名称必须与CUCM SIP中继安全配置文件上的X.509主题名称匹配。最佳实践是使用主机名和域名（如果启用了域名）。

关联在步骤1中创建的RSA密钥对。

crypto pki trustpoint SUBCA1
enrollment terminal pem
serial-number none
ip-address none
subject-name CN=CUBE-2
revocation-check none
rsakeypair CUBE
 
crypto pki trustpoint ROOT
enrollment terminal
revocation-check none

3.生成CUBE证书签名请求(CSR)。

crypto pki enroll命令会生成提供给企业CA的CSR，以获取签名的证书。

CUBE-2(config)#crypto pki enroll SUBCA1
% Start certificate enrollment ..
 
% The subject name in the certificate will include: CN=CUBE-2
% The subject name in the certificate will include: CUBE-2
Display Certificate Request to terminal? [yes/no]: yes
Certificate Request follows:
 
-----BEGIN CERTIFICATE REQUEST-----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-----END CERTIFICATE REQUEST-----
 
---End - This line not part of the certificate request---
 
Redisplay enrollment request? [yes/no]: no
CUBE-2(config)#
 

将BEGIN CERTIFICATE REQUEST与END CERTIFICATE REQUEST之间的输出复制到记事本文件中。

CUBE CSR将具有以下关键属性：

  

 Attributes:
 Requested Extensions:
   X509v3 Key Usage: critical
      Digital Signature, Key Encipherment

 4.  从从属CA获取CA证书根CA，然后获取CA证书和签名CUBE证书。

要获取签名的CUBE证书，请使用步骤3中生成的CSR。映像来自Microsoft CA Web服务器。

5.导入根CA和从属CA的CA证书。

在记事本中打开证书，将内容从BEGIN CERTIFICATE REQUEST复制并粘贴到END CERTIFICATE REQUEST。

CUBE-2(config)#crypto pki authenticate SUBCA1
 
Enter the base 64 encoded CA certificate.
End with a blank line or the word "quit" on a line by itself
 
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
 
Trustpoint 'SUBCA1' is a subordinate CA and holds a non self signed cert
Certificate has the following attributes:
 Fingerprint MD5: C420B7BB 88A2545F E26B0875 37D9EB45
 Fingerprint SHA1: 110AF87E 53E6D1C2 19404BA5 0149C5CA 2CF2BE1C
 
% Do you accept this certificate? [yes/no]: yes
Trustpoint CA certificate accepted.
% Certificate successfully imported
 
CUBE-2(config)#
CUBE-2(config)#crypto pki authenticate ROOT
 
Enter the base 64 encoded CA certificate.
End with a blank line or the word "quit" on a line by itself
 
-----BEGIN CERTIFICATE-----
MIIDezCCAmOgAwIBAgIQMVF/OWq+ELxFC2IdUGvd2jANBgkqhkiG9w0BAQUFADBQ
MRIwEAYKCZImiZPyLGQBGRYCbGkxFjAUBgoJkiaJk/IsZAEZFgZzb3BoaWExIjAg
BgNVBAMTGXNvcGhpYS1XSU4tM1MxOEpDM0xNMkEtQ0EwHhcNMTQwOTEzMjMzODA2
WhcNMTkwOTEzMjM0ODA1WjBQMRIwEAYKCZImiZPyLGQBGRYCbGkxFjAUBgoJkiaJ
k/IsZAEZFgZzb3BoaWExIjAgBgNVBAMTGXNvcGhpYS1XSU4tM1MxOEpDM0xNMkEt
Q0EwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQC4aywr1oOpTdTrM8Ya
R3RkcahbbhR3q7P1luTDUDNM5Pi6P8z3MckfjB/yy6SWr1QnddhyvMG6IGNtVxJ4
eyw0c7jbArXWOemGLOt454A0mCfcbwMhjQBycg9SM1r1Umzad7kOCzj/rD6hMbC4
jXpg6uU8g7eB3LzN1XF93DHjxYCBKMIeG45pqmsOc3mUj1CbCtnYXgno+mfhNzhR
HSth02z4XlGm99v46j/PqGjNRq4WKCwDc45SG3QjJDqDxnRJPKtRdNva66UJfDJp
4YMXQxOSkKMtDEDhH/Eic7CrJ3EywpUpMZAmqh4bmQ7Vo2pnRTbYdaAv/+yr8sMj
+FU3AgMBAAGjUTBPMAsGA1UdDwQEAwIBhjAPBgNVHRMBAf8EBTADAQH/MB0GA1Ud
DgQWBBTvo1P6OP4LXm9RDv5MbIMk8jnOfDAQBgkrBgEEAYI3FQEEAwIBADANBgkq
hkiG9w0BAQUFAAOCAQEAmd7hJ2EEUmuMZrc/qtSJ223loJlpKEPMVi7CrodtWSgu
5mNt1XsgxijYMqD5gJe1oq5dmv7efYvOvI2WTCXfwOBJ0on8tgLFwp1+SUJWs95m
OXTyoS9krsI2G2kQkjQWniMqPdNxpmJ3C4WvQLPLwtEOSRZRBvsKy6lczrgrV2mZ
kx12n5YGrGcXSblPPUddlJep1l8U+AQC8wkSzfJu0yHJwoH+lrIfgqKUee4x7z6s
SCaGddCYr3OK/3Wzs/WjSO2UETvNL3NEtWHDc2t4Y7mmIMSDvGjHZUgGZotwc9kt
9f2dZA0rtgBq4IDtpxkR3CQaauB7wUCpzemHzf+z9Q==
-----END CERTIFICATE-----
 
Certificate has the following attributes:
 Fingerprint MD5: 511E1008 6D315E03 4B748601 7EE1A0E5
 Fingerprint SHA1: 8C35D9FA 8F7A00AC 0AA2FCA8 AAC22D5F D08790BB
 
% Do you accept this certificate? [yes/no]: yes
Trustpoint CA certificate accepted.
% Certificate successfully imported
 
CUBE-2(config)#

6.导入CUBE签名的证书。

在记事本中打开证书，将内容从BEGIN CERTIFICATE REQUEST复制并粘贴到END CERTIFICATE REQUEST。

CUBE-2(config)#crypto pki import SUBCA1 certificate

Enter the base 64 encoded certificate.
End with a blank line or the word "quit" on a line by itself

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

% Router Certificate successfully imported

CUBE-2(config)#

7.将TCP TLS配置为传输协议。

这可以在全局级别或拨号对等体级别执行。

  

 voice service voip
  sip
   session transport tcp tls

8.为sip-ua分配信任点，此信任点将用于CUBE和CUCM之间的所有sip信令：

 sip-ua
 crypto signaling remote-addr <cucm pub ip address> 255.255.255.255 trustpoint SUBCA1
 crypto signaling remote-addr <cucm sub ip address> 255.255.255.255 trustpoint SUBCA1

  或者，可以为来自多维数据集的所有sip信令配置默认信任点：

 sip-ua
 crypto signaling default trustpoint SUBCA1

9.启用SRTP。

这可以在全局级别或拨号对等体级别执行。

Voice service voip
srtp fallback 

10.对于SRTP和实时传输协议(RTP)网际互联，需要安全转码器。

如果Cisco IOS®版本为15.2.2T(CUBE 9.0)或更高版本，则可以配置本地转码接口(LTI)转码器以最小化配置。

LTI转码器不需要SRTP-RTP呼叫的公钥基础设施(PKI)信任点配置。

 dspfarm profile 1 transcode universal security
 codec g711ulaw
 codec g711alaw
 codec g729ar8
 codec g729abr8
 maximum sessions 10
 associate application CUBE

如果Cisco IOS®低于15.2.2T，则配置SCCP转码器。

SCCP转码器需要信令信任点，但是，如果使用同一路由器托管转码器，则同一信任点(SUBCA1)可用于CUBE和转码器。

sccp local GigabitEthernet0/2
 sccp ccm 10.106.95.153 identifier 1 priority 1 version 7.0
 sccp
 !
 sccp ccm group 1
 bind interface GigabitEthernet0/0
 associate ccm 1 priority 1
 associate profile 2 register secxcode
 !
 dspfarm profile 2 transcode universal security
 trustpoint SUBCA1
 codec g711ulaw
 codec g711alaw
 codec g729ar8
 codec g729abr8
 maximum sessions 10
 associate application SCCP
 
 telephony-service
 secure-signaling trustpoint SUBCA1
 sdspfarm units 1
 sdspfarm transcode sessions 10
 sdspfarm tag 1 secxcode
 max-ephones 1
 max-dn 1
 ip source-address 10.106.95.153 port 2000
 max-conferences 8 gain -6
 transfer-system full-consult

配置CUCM

1.在所有CUCM节点上生成CallManager CSR。

导航至CM OS Administration > Security > Certificate Management > Generate Certificate Signing Request，如图所示。

CallManager CSR将具有以下关键属性：

Requested Extensions:
 X509v3 Extended Key Usage:
   TLS Web Server Authentication, TLS Web Client Authentication, IPSec End System
 X509v3 Key Usage:
   Digital Signature, Key Encipherment, Data Encipherment, Key Agreement
 

2.获取由从属CA签名的所有CM节点的CallManager证书。

使用步骤1中生成的CSR。任何Web服务器证书模板都会工作，确保签名证书至少具有以下密钥使用属性：数字签名、密钥加密、数据加密，如图所示。

3.从根CA和从属CA上传CA证书作为CallManager-Trust。

导航至CM OS Administration > Security > Certificate Management > Upload Certificate/Certificate链，如图所示。

4.如图所示，将CallManager签名证书上载为CallManager。

5.在发布服务器上更新证书信任列表(CTL)文件（通过CLI）。

admin:utils ctl update CTLFile
This operation will update the CTLFile. Do you want to continue? (y/n):
 
Updating CTL file
CTL file Updated
Please Restart the TFTP and Cisco CallManager services on all nodes in the cluster that run these services
admin:
  

6.  在所有节点上重新启动CallManager和TFTP服务，在发布服务器上重新启动CAPF服务。

7.创建新的SIP中继安全配置文件。

  

在CM Administration上，导航至System > Security > SIP Trunk Security Profiles > Find。

复制现有非安全SIP中继配置文件以创建新的安全配置文件，如此映像所示。

8.  创建到CUBE的SIP中继。

如图所示，在SIP中继上启用SRTP允许。

配置目标端口5061(TLS)并在SIP中继上应用新安全SIP中继安全配置文件，如图所示。

验证

  

使用本部分可确认配置能否正常运行。

show sip-ua connections tcp tls detail
show call active voice brief
 
e.g.
 
Secure-CUBE#show sip-ua connections tcp tls detail
Total active connections : 2
No. of send failures : 0
No. of remote closures : 13
No. of conn. failures : 0
No. of inactive conn. ageouts : 0
TLS client handshake failures : 0
TLS server handshake failures : 0
 
---------Printing Detailed Connection Report---------
Note:
** Tuples with no matching socket entry
 - Do 'clear sip <tcp[tls]/udp> conn t ipv4:<addr>:<port>'
 to overcome this error condition
++ Tuples with mismatched address/port entry
 - Do 'clear sip <tcp[tls]/udp> conn t ipv4:<addr>:<port> id <connid>'
 to overcome this error condition
 
Remote-Agent:10.106.95.151, Connections-Count:2
Remote-Port Conn-Id Conn-State WriteQ-Size Local-Address
=========== ======= =========== =========== ===========
 5061        16    Established          0 10.106.95.153
 57396       17    Established          0 10.106.95.153
 
 
-------------- SIP Transport Layer Listen Sockets ---------------
Conn-Id          Local-Address
===========     =============================
 2              [10.106.95.153]:5061

使用LTI转码器时，会捕获show call active voice brief命令的输出。

Telephony call-legs: 0
SIP call-legs: 2
H323 call-legs: 0
Call agent controlled call-legs: 0
SCCP call-legs: 0
Multicast call-legs: 0
Total call-legs: 2
1283 : 33 357052840ms.1 (23:57:23.929 IST Sun Feb 15 2015) +2270 pid:3 Answer 3001 active
dur 00:00:08 tx:383/61280 rx:371/59360 dscp:0 media:0 audio tos:0xB8 video tos:0x0
IP 10.106.95.132:17172 SRTP: off rtt:0ms pl:0/0ms lost:0/0/0 delay:0/0/0ms g711ulaw TextRelay: off Transcoded: Yes
media inactive detected:n media contrl rcvd:n/a timestamp:n/a
long duration call detected:n long duration call duration:n/a timestamp:n/a
LostPacketRate:0.00 OutOfOrderRate:0.00
 
1283 : 34 357052840ms.2 (23:57:23.929 IST Sun Feb 15 2015) +2270 pid:1 Originate 2001 active
dur 00:00:08 tx:371/60844 rx:383/62812 dscp:0 media:0 audio tos:0xB8 video tos:0x0
IP 10.65.58.24:24584 SRTP: on rtt:0ms pl:0/0ms lost:0/0/0 delay:0/0/0ms g711ulaw TextRelay: off Transcoded: Yes
media inactive detected:n media contrl rcvd:n/a timestamp:n/a
long duration call detected:n long duration call duration:n/a timestamp:n/a
LostPacketRate:0.00 OutOfOrderRate:0.00

此外，当在Cisco IP电话和CUBE或网关之间进行SRTP加密呼叫时，IP电话上会显示锁图标。

故障排除

  

本部分提供了可用于对配置进行故障排除的信息。

这些调试有助于排除PKI/TLS/SIP/SRTP问题。

debug crypto pki{ API | callbacks | messages | scep | server | transactions | validation }
debug ssl openssl { errors | ext | msg | states }
debug srtp {api | events }
debug ccsip {messages | error | events | states | all }
debug voip ccapi inout