1 搭建CA
1.1 建立CA目录与文件
基于默认配置文件(openssl.conf)有稍作改动以便于使用
目录结构：
kevin@kevin-TM1701:~/gaoshi/zzxia-CA-openssl$ tree
.
├── ca.crt.pem
├── ca.csr.pem
├── certs
├── crl
├── crlnumber
├── from_user_csr
│ ├── c919.lan.csr
│ ├── c919.lan.key
│ ├── zjlh.lan.csr
│ └── zjlh.lan.key
├── index.txt
├── index.txt.attr
├── index.txt.attr.old
├── index.txt.old
├── newcerts
│ ├── 01.pem
│ └── 02.pem
├── openssl.cnf---c919.lan
├── openssl.cnf---zjlh.lan
├── private
│ └── ca.key.pem
├── readme.md
├── serial
├── serial.old
└── to_user_crt
├── c919.lan.crt
└── zjlh.lan.crt
6 directories, 21 files
以下目录都是为了方便CA为用户颁发证书而建立：
* from_user_csr：用以存放用户的证书请求文件，
* to_user_crt ：用以存放CA为用户颁发的证书文件，另外：newcerts(新的)及certs（曾经的）也是存放CA颁发的用户证书路径
其他目录都是依据openssl.conf创建：
* private ：存放ca的秘钥ca.key.pem的目录与文件名
* ca.crt.pem ：ca证书
* index.txt ：ca数据库，初始值为空
* serial ：下一个证书的编号，初始为两位数，比如：01
* crlnumber ：下一个吊销证书的编号，初始为两位数，比如：01
* newcerts ：新颁发的证书
* certs ：用来保存的已颁发证书
* crl.pem ：CA吊销证书
* crl ：用来保持的已吊销证书
1.2 生成CA私钥及证书
openssl genrsa -out private/ca.key.pem 4096
openssl req -new -key private/ca.key.pem -out ca.csr.pem
openssl x509 -days 3650 -req -in ca.csr.pem -signkey private/ca.key.pem -out ca.crt.pem
- 自签名证书无法使用配置文件，CA服务器证书也是自签名证书，所以也不能使用配置文件
- 生成的证书都是pem格式的，文件名是ca.crt.pem或者ca.crt都无所谓
1.3 证书颁发之配置文件准备openssl.cnf
确认配置文件中ca相关信息(CA_default节)的正确
配置用户证书请求与CA颁发中用到的信息：用户信息(req_distinguished_name节)、通用名称(commonName)、备用名称(alt_names节)
openssl.cnf用途：
- 用户在生成证书请求时会用到以上信息(用户信息、通用名称、备用名称)
- CA服务器在颁发证书时会用到以上信息及CA相关信息
openssl.cnf文件中配置关系图（不支持这种语法）：
graph LR;
1(openssl.conf)-->2(new__oids)
1-->3(ca)
1-->4(req)
1-->5(policy_anything)
1-->6(proxy_cert_ext)
1-->7(tsa)
3-->8(CA_default)
8-->9(usr_cert)
8-->10(crl_ext)
8-->11(policy_match)
4-->12(req_distinguished_name)
4-->13(req_attributes)
4-->14(v3_ca)
4-->15(v3_req)
15-->16(alt_names)
openssl.cnf文件中配置关系图
2 颁发证书
2.1 用户自己生成秘钥与证书请求（可以在自己的PC上完成）
# 生成秘钥（秘钥中包含私钥和公钥）
openssl genrsa -out from_user_csr/docker-repo.key 2048
# 用户生成证书请求，如果需要备用名，需要使用openssl.cnf
openssl req -new -key from_user_csr/docker-repo.key -out from_user_csr/docker-repo.csr -config openssl.cnf
# 查看证书请求内容
openssl req -in from_user_csr/docker-repo.csr -noout -text
2.2 CA服务器颁发证书
# 将证书请求文件cp到服务器上，比如：from_user_csr/docker-repo.csr
# 如果需要备用名，需要编辑openssl.cnf（服务器上）
# 颁发：
#openssl ca -in from_user_csr/docker-repo.csr -out to_user_crt/docker-repo.crt -cert ca.crt -keyfile ca.key -extensions v3_req -config openssl.cnf
# 省略ca相关文件，因为openssl.cnf中已经定义：
openssl ca -in from_user_csr/docker-repo.csr -out to_user_crt/docker-repo.crt -extensions v3_req -config openssl.cnf
# 查看办法的证书内容：
openssl x509 -in to_user_crt/docker-repo.crt -noout -text
2.3 变量方式方便点：
DOMAIN='zjlh.lan'
openssl genrsa -out from_user_csr/${DOMAIN}.key 2048
openssl req -new -key from_user_csr/${DOMAIN}.key -out from_user_csr/${DOMAIN}.csr -config openssl.cnf---${DOMAIN}
openssl req -in from_user_csr/${DOMAIN}.csr -noout -text
openssl ca -in from_user_csr/${DOMAIN}.csr -out to_user_crt/${DOMAIN}.crt -extensions v3_req -config openssl.cnf---${DOMAIN}
openssl x509 -in to_user_crt/${DOMAIN}.crt -noout -text
2.4 例子
kevin@kevin-TM1701:~/gaoshi/zzxia-CA-openssl$ DOMAIN='zjlh.lan'
kevin@kevin-TM1701:~/gaoshi/zzxia-CA-openssl$ openssl genrsa -out from_user_csr/${DOMAIN}.key 2048
Generating RSA private key, 2048 bit long modulus
..........................................................................+++
..................+++
e is 65537 (0x10001)
kevin@kevin-TM1701:~/gaoshi/zzxia-CA-openssl$
kevin@kevin-TM1701:~/gaoshi/zzxia-CA-openssl$ openssl req -new -key from_user_csr/${DOMAIN}.key -out from_user_csr/${DOMAIN}.csr -config openssl.cnf---${DOMAIN}
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Country Name (2 letter code) [CN]:
State or Province Name (full name) [GuangDong]:
Locality Name (eg, city) [GuangZhou]:
Organization Name (eg, company) [ZJLH]:
Organizational Unit Name (eg, section) [IT]:
Common Name (eg, your name or your server's hostname) [zjlh.lan]:
Email Address [[email protected]]:
Please enter the following 'extra' attributes
to be sent with your certificate request
A challenge password []:
An optional company name []:
kevin@kevin-TM1701:~/gaoshi/zzxia-CA-openssl$
kevin@kevin-TM1701:~/gaoshi/zzxia-CA-openssl$ openssl ca -in from_user_csr/${DOMAIN}.csr -out to_user_crt/${DOMAIN}.crt -extensions v3_req -config openssl.cnf---${DOMAIN}
Using configuration from openssl.cnf---zjlh.lan
Check that the request matches the signature
Signature ok
Certificate Details:
Serial Number: 1 (0x1)
Validity
Not Before: Sep 26 05:41:47 2020 GMT
Not After : Sep 26 05:41:47 2021 GMT
Subject:
countryName = CN
stateOrProvinceName = GuangDong
organizationName = ZJLH
organizationalUnitName = IT
commonName = zjlh.lan
emailAddress = [email protected]
X509v3 extensions:
X509v3 Basic Constraints:
CA:FALSE
X509v3 Key Usage:
Digital Signature, Non Repudiation, Key Encipherment
X509v3 Subject Alternative Name:
DNS:zjlh.lan, DNS:*.zjlh.lan, DNS:docker-repo
Certificate is to be certified until Sep 26 05:41:47 2021 GMT (365 days)
Sign the certificate? [y/n]:y
1 out of 1 certificate requests certified, commit? [y/n]y
Write out database with 1 new entries
Data Base Updated
kevin@kevin-TM1701:~/gaoshi/zzxia-CA-openssl$
kevin@kevin-TM1701:~/gaoshi/zzxia-CA-openssl$ openssl x509 -in to_user_crt/${DOMAIN}.crt -noout -text
Certificate:
Data:
Version: 3 (0x2)
Serial Number: 1 (0x1)
Signature Algorithm: sha256WithRSAEncryption
Issuer: C=CN, ST=GuangDong, L=GuangZhou, O=\xC3\xA7\xC2\x8C\xC2\xAA\xC3\xA7\xC2\x8C\xC2\xAA\xC3\xA4\xC2\xBE\xC2\xA0\xC3\xA9\xC2\x9B\xC2\x86\xC3\xA5\xC2\x9B\xC2\xA2, OU=IT, CN=zzxia-root-CA/[email protected]
Validity
Not Before: Sep 26 05:41:47 2020 GMT
Not After : Sep 26 05:41:47 2021 GMT
Subject: C=CN, ST=GuangDong, O=ZJLH, OU=IT, CN=zjlh.lan/[email protected]
Subject Public Key Info:
Public Key Algorithm: rsaEncryption
Public-Key: (2048 bit)
Modulus:
00:c8:a0:a8:ea:33:87:98:22:c2:83:ba:7e:a3:4b:
4e:b8:38:cb:21:32:fd:06:41:8d:2e:e9:2f:19:35:
......
fa:83:04:62:26:09:03:64:fc:0b:57:aa:36:ad:00:
3e:7d:08:cb:11:f2:c7:68:74:a7:78:aa:47:76:4f:
60:33
Exponent: 65537 (0x10001)
X509v3 extensions:
X509v3 Basic Constraints:
CA:FALSE
X509v3 Key Usage:
Digital Signature, Non Repudiation, Key Encipherment
X509v3 Subject Alternative Name:
DNS:zjlh.lan, DNS:*.zjlh.lan, DNS:docker-repo
Signature Algorithm: sha256WithRSAEncryption
84:e1:d8:36:41:f7:b8:4f:3a:a1:e6:18:2a:50:8e:0b:24:7d:
9a:f6:7e:8d:ed:93:44:7a:d3:26:23:9d:36:f0:4f:d1:bb:ee:
......
86:32:9e:88:fd:a9:5d:cc:e9:3c:55:be:e6:d9:9c:ae:fd:51:
38:da:ab:c2:4f:b9:d0:8f:df:49:89:94:03:f6:8e:45:64:9d:
e9:93:75:4a:0a:29:45:96
2.5 错误：
[root@localhost CA]# openssl ca -in server.csr -out server.crt
Using configuration from ./openssl.cnf
Check that the request matches the signature
Signature ok
The organizationName field needed to be the same in the
CA certificate (ZZXIA) and the request (ZJLH)
如果出现了以上错误，则请修改openssl.cnf中"[ policy_match ]"里的项：
#如果值为"match"，则客户端证书请求时，相应信息必须和CA证书保持一致；反之如果为"optional"，则不用
#countryName = match
countryName = optional
#stateOrProvinceName = match
stateOrProvinceName = optional
#organizationName = match
organizationName = optional
organizationalUnitName = optional
commonName = supplied
emailAddress = optional
2.6 v3扩展说明
一般用来增加证书备用名称
证书请求中添加v3扩展：
在openssl.cnf中开启 req_extensions = v3_req，添加备用名称则修改[ alt_names ]节
在CA证书颁发时启用v3扩展
命令行增加 "-extensions v3_req" 及[ alt_names ]节
总结
- 不管证书请求中是否有v3扩展，都可以在证书颁发时添加扩展：命令行添加 "-extensions v3_req"，并在openssl.cnf中，"req_extensions = v3_req"及[ alt_names ]下的内容；
- 不管证书请求中是否有v3扩展，可以在证书颁发时关闭扩展：去掉扩展命令即可 "-extensions v3_req"；
- 颁发出来的证书有没有扩展与证书请求无关，与命令行是否添加 "-extensions v3_req"有关；
- 证书扩展的备用名称与证书请求也是无关的，因为证书颁发最终使用的备用名称是ca上openssl.cnf中[ alt_names ]下的内容；
- 也就是证书请求时v3扩展的备用名称只有提示用途，最终证书中的备用名称只与ca上openssl.cnf中[ alt_names ]下的内容相关；
另：
增加备用名称，请修改以下内容：
[ alt_names ]
# commonName值必须也出现在alt_names备用名称列表中
DNS.1 = zjlh.lan
DNS.2 = *.zjlh.lan
#DNS.n = zzxia.vip
3 吊销证书
# 查询需要吊销证书信息
#openssl x509 -in newcerts/03.pem -noout -serial -subject
openssl x509 -in to_user_crt/docker-repo.crt -noout -serial -subject
# 吊销
openssl ca -revoke newcerts/03.pem -config openssl.cnf
4 更新吊销证书列表
#openssl ca -gencrl -config openssl.cnf #---为什么没有根据openssl.cnf更新crl.pem
openssl ca -gencrl -out crl.pem -config openssl.cnf
# 查看
openssl crl -in crl.pem -noout -text
5 客户端安装ca证书
# ubuntu
#sudo cp gc-ca.crt /usr/local/share/ca-certificates/
sudo cp gc-ca.crt.pem /usr/local/share/ca-certificates/
sudo update-ca-certificates
# centos
cp gc-ca.crt /etc/pki/ca-trust/source/anchors/
update-ca-trust
6 自签名证书和私有CA签名的证书的区别
自签名的证书无法被吊销，CA签名的证书可以被吊销 能不能吊销证书的区别在于，如果你的私钥被黑客获取，如果证书不能被吊销，则黑客可以伪装成你与用户进行通信
如果你的规划需要创建多个证书，那么使用私有CA的方法比较合适，因为只要给所有的客户端都安装了CA的证书，那么以该证书签名过的证书，客户端都是信任的，也就是安装一次就够了
如果你直接用自签名证书，你需要给所有的客户端安装该证书才会被信任，如果你需要第二个证书，则还的挨个给所有的客户端安装证书2才会被信任。
7 good
参考：https://blog.csdn.net/u014721096/article/details/78571287
8 openssl.cnf：
（打包是最好的，但是没有地方长存，不如就贴这里吧）
#
# OpenSSL example configuration file.
# This is mostly being used for generation of certificate requests.
#
# This definition stops the following lines choking if HOME isn't
# defined.
HOME = .
RANDFILE = $ENV::HOME/.rnd
# Extra OBJECT IDENTIFIER info:
#oid_file = $ENV::HOME/.oid
oid_section = new_oids
# To use this configuration file with the "-extfile" option of the
# "openssl x509" utility, name here the section containing the
# X.509v3 extensions to use:
# extensions =
# (Alternatively, use a configuration file that has only
# X.509v3 extensions in its main [= default] section.)
[ new_oids ]
# We can add new OIDs in here for use by 'ca', 'req' and 'ts'.
# Add a simple OID like this:
# testoid1=1.2.3.4
# Or use config file substitution like this:
# testoid2=${testoid1}.5.6
# Policies used by the TSA examples.
tsa_policy1 = 1.2.3.4.1
tsa_policy2 = 1.2.3.4.5.6
tsa_policy3 = 1.2.3.4.5.7
####################################################################
[ ca ]
default_ca = CA_default # The default ca section
####################################################################
[ CA_default ]
dir = /home/kevin/gaoshi/zzxia-CA-openssl # Where everything is kept
# 颁发的证书路径
new_certs_dir = $dir/newcerts # default place for new certs.
certs = $dir/certs # Where the issued certs are kept
crl = $dir/crl.pem # The current CRL
crl_dir = $dir/crl # Where the issued crl are kept
#unique_subject = no # Set to 'no' to allow creation of
# several ctificates with same subject.
# ca数据库
database = $dir/index.txt # database index file.
serial = $dir/serial # The current serial number，手动设置初始值01
crlnumber = $dir/crlnumber # the current crl number，手动设置初始值01
# must be commented out to leave a V1 CRL
# ca证书等
certificate = $dir/ca.crt.pem # The CA certificate
private_key = $dir/private/ca.key.pem # The private key
RANDFILE = $dir/private/.rand # private random number file
# 添加证书扩展
x509_extensions = usr_cert # The extentions to add to the cert
# Comment out the following two lines for the "traditional"
# (and highly broken) format.
name_opt = ca_default # Subject Name options
cert_opt = ca_default # Certificate field options
# Extension copying option: use with caution.
# copy_extensions = copy
# 吊销列表扩展
# Extensions to add to a CRL. Note: Netscape communicator chokes on V2 CRLs
# so this is commented out by default to leave a V1 CRL.
# crlnumber must also be commented out to leave a V1 CRL.
# crl_extensions = crl_ext
crl_extensions = crl_ext
#
default_days = 365 # how long to certify for
default_crl_days= 30 # how long before next CRL
default_md = sha256 # use SHA-256 by default
preserve = no # keep passed DN ordering
# A few difference way of specifying how similar the request should look
# For type CA, the listed attributes must be the same, and the optional
# and supplied fields are just that :-)
policy = policy_match
# For the CA policy
[ policy_match ]
#如果值为"match"，则客户端证书请求时，相应信息必须和CA证书保持一致；反之如果为"optional"，则不用
#countryName = match
countryName = optional
#stateOrProvinceName = match
stateOrProvinceName = optional
#organizationName = match
organizationName = optional
organizationalUnitName = optional
commonName = supplied
emailAddress = optional
# For the 'anything' policy
# At this point in time, you must list all acceptable 'object'
# types.
[ policy_anything ]
countryName = optional
stateOrProvinceName = optional
localityName = optional
organizationName = optional
organizationalUnitName = optional
commonName = supplied
emailAddress = optional
####################################################################
[ req ]
default_bits = 2048
default_md = sha256
default_keyfile = privkey.pem
distinguished_name = req_distinguished_name
attributes = req_attributes
# 添加自签名证书扩展
x509_extensions = v3_ca # The extentions to add to the self signed cert
# Passwords for private keys if not present they will be prompted for
# input_password = secret
# output_password = secret
# This sets a mask for permitted string types. There are several options.
# default: PrintableString, T61String, BMPString.
# pkix : PrintableString, BMPString (PKIX recommendation before 2004)
# utf8only: only UTF8Strings (PKIX recommendation after 2004).
# nombstr : PrintableString, T61String (no BMPStrings or UTF8Strings).
# MASK:XXXX a literal mask value.
# WARNING: ancient versions of Netscape crash on BMPStrings or UTF8Strings.
string_mask = utf8only
# 添加证书请求扩展
# req_extensions = v3_req # The extensions to add to a certificate request
req_extensions = v3_req # The extensions to add to a certificate request
[ req_distinguished_name ]
countryName = Country Name (2 letter code)
countryName_default = CN
countryName_min = 2
countryName_max = 2
stateOrProvinceName = State or Province Name (full name)
stateOrProvinceName_default = GuangDong
localityName = Locality Name (eg, city)
localityName_default = GuangZhou
0.organizationName = Organization Name (eg, company)
0.organizationName_default = ZZXia Group
# we can do this but it is not needed normally :-)
#1.organizationName = Second Organization Name (eg, company)
#1.organizationName_default = World Wide Web Pty Ltd
organizationalUnitName = Organizational Unit Name (eg, section)
organizationalUnitName_default = IT
commonName = Common Name (eg, your name or your server\'s hostname)
commonName_default = c919.lan
commonName_max = 64
emailAddress = Email Address
emailAddress_max = 64
emailAddress_default = [email protected]
# SET-ex3 = SET extension number 3
[ req_attributes ]
challengePassword = A challenge password
challengePassword_min = 4
challengePassword_max = 20
unstructuredName = An optional company name
# CA在签名时添加扩展
[ usr_cert ]
# These extensions are added when 'ca' signs a request.
# This goes against PKIX guidelines but some CAs do it and some software
# requires this to avoid interpreting an end user certificate as a CA.
basicConstraints=CA:FALSE
# Here are some examples of the usage of nsCertType. If it is omitted
# the certificate can be used for anything *except* object signing.
# This is OK for an SSL server.
# nsCertType = server
# For an object signing certificate this would be used.
# nsCertType = objsign
# For normal client use this is typical
# nsCertType = client, email
# and for everything including object signing:
# nsCertType = client, email, objsign
# This is typical in keyUsage for a client certificate.
# keyUsage = nonRepudiation, digitalSignature, keyEncipherment
# This will be displayed in Netscape's comment listbox.
nsComment = "OpenSSL Generated Certificate"
# PKIX recommendations harmless if included in all certificates.
subjectKeyIdentifier=hash
authorityKeyIdentifier=keyid,issuer
# This stuff is for subjectAltName and issuerAltname.
# Import the email address.
# subjectAltName=email:copy
# An alternative to produce certificates that aren't
# deprecated according to PKIX.
# subjectAltName=email:move
# Copy subject details
# issuerAltName=issuer:copy
#nsCaRevocationUrl = http://www.domain.dom/ca-crl.pem
#nsBaseUrl
#nsRevocationUrl
#nsRenewalUrl
#nsCaPolicyUrl
#nsSslServerName
# This is required for TSA certificates.
# extendedKeyUsage = critical,timeStamping
# 证书请求扩展
[ v3_req ]
# Extensions to add to a certificate request
basicConstraints = CA:FALSE
keyUsage = nonRepudiation, digitalSignature, keyEncipherment
# kz --- 添加备用名
subjectAltName = @alt_names
# kz
# 新增 alt_names,注意括号前后的空格，DNS.x 的数量可以自己加，common name的值也必须添加到这里
[ alt_names ]
DNS.1 = c919.lan
DNS.2 = *.c919.lan
DNS.3 = docker-repo
# CA扩展
[ v3_ca ]
# Extensions for a typical CA
# PKIX recommendation.
subjectKeyIdentifier=hash
authorityKeyIdentifier=keyid:always,issuer
# This is what PKIX recommends but some broken software chokes on critical
# extensions.
#basicConstraints = critical,CA:true
# So we do this instead.
basicConstraints = CA:true
# Key usage: this is typical for a CA certificate. However since it will
# prevent it being used as an test self-signed certificate it is best
# left out by default.
# keyUsage = cRLSign, keyCertSign
# Some might want this also
# nsCertType = sslCA, emailCA
# Include email address in subject alt name: another PKIX recommendation
# subjectAltName=email:copy
# Copy issuer details
# issuerAltName=issuer:copy
# DER hex encoding of an extension: beware experts only!
# obj=DER:02:03
# Where 'obj' is a standard or added object
# You can even override a supported extension:
# basicConstraints= critical, DER:30:03:01:01:FF
# 证书吊销扩展
[ crl_ext ]
# CRL extensions.
# Only issuerAltName and authorityKeyIdentifier make any sense in a CRL.
# issuerAltName=issuer:copy
authorityKeyIdentifier=keyid:always
# 代理证书扩展
[ proxy_cert_ext ]
# These extensions should be added when creating a proxy certificate
# This goes against PKIX guidelines but some CAs do it and some software
# requires this to avoid interpreting an end user certificate as a CA.
basicConstraints=CA:FALSE
# Here are some examples of the usage of nsCertType. If it is omitted
# the certificate can be used for anything *except* object signing.
# This is OK for an SSL server.
# nsCertType = server
# For an object signing certificate this would be used.
# nsCertType = objsign
# For normal client use this is typical
# nsCertType = client, email
# and for everything including object signing:
# nsCertType = client, email, objsign
# This is typical in keyUsage for a client certificate.
# keyUsage = nonRepudiation, digitalSignature, keyEncipherment
# This will be displayed in Netscape's comment listbox.
nsComment = "OpenSSL Generated Certificate"
# PKIX recommendations harmless if included in all certificates.
subjectKeyIdentifier=hash
authorityKeyIdentifier=keyid,issuer
# This stuff is for subjectAltName and issuerAltname.
# Import the email address.
# subjectAltName=email:copy
# An alternative to produce certificates that aren't
# deprecated according to PKIX.
# subjectAltName=email:move
# Copy subject details
# issuerAltName=issuer:copy
#nsCaRevocationUrl = http://www.domain.dom/ca-crl.pem
#nsBaseUrl
#nsRevocationUrl
#nsRenewalUrl
#nsCaPolicyUrl
#nsSslServerName
# This really needs to be in place for it to be a proxy certificate.
proxyCertInfo=critical,language:id-ppl-anyLanguage,pathlen:3,policy:foo
####################################################################
[ tsa ]
default_tsa = tsa_config1 # the default TSA section
[ tsa_config1 ]
# These are used by the TSA reply generation only.
dir = ./demoCA # TSA root directory
serial = $dir/tsaserial # The current serial number (mandatory)
crypto_device = builtin # OpenSSL engine to use for signing
signer_cert = $dir/tsacert.pem # The TSA signing certificate
# (optional)
certs = $dir/cacert.pem # Certificate chain to include in reply
# (optional)
signer_key = $dir/private/tsakey.pem # The TSA private key (optional)
default_policy = tsa_policy1 # Policy if request did not specify it
# (optional)
other_policies = tsa_policy2, tsa_policy3 # acceptable policies (optional)
digests = sha1, sha256, sha384, sha512 # Acceptable message digests (mandatory)
accuracy = secs:1, millisecs:500, microsecs:100 # (optional)
clock_precision_digits = 0 # number of digits after dot. (optional)
ordering = yes # Is ordering defined for timestamps?
# (optional, default: no)
tsa_name = yes # Must the TSA name be included in the reply?
# (optional, default: no)
ess_cert_id_chain = no # Must the ESS cert id chain be included?
# (optional, default: no)
