使用 OpenSSL 生成包含证书模板信息的 CSR

Question

我正在使用以下配置文件使用 OpenSSL 生成 CSR：

[ req ]
default_bits           = 2048
default_keyfile        = usercert.key
distinguished_name     = req_distinguished_name
attributes             = req_attributes
prompt                 = no

[ req_distinguished_name ]
C            = FR
L            = Paris
OU           = IT
CN           = FirstName LastName

[ req_attributes ]
1.3.6.1.4.1.311.13.2.1 = CertificateTemplate=CustomUserOffline

我的目标是在 CSR 中包含模板名称，以便 Windows CA 能够处理它。

我使用以下命令行来生成 CSR：

openssl req -new -key usercert.key -out usercert.csr -config usercert.cnf

运行它时没有错误，我可以使用以下命令验证 CSR：

openssl req -text -noout -verify -in usercert.csr

verify OK
Certificate Request:
    Data:
        Version: 1 (0x0)
        Subject: C = FR, L = Paris, OU = IT, CN = FirstName LastName
        Subject Public Key Info:
            Public Key Algorithm: rsaEncryption
                RSA Public-Key: (2048 bit)
                Modulus:
                    00:af:85:28:40:84:d8:8a:58:35:86:b8:f5:25:b2:
                    ...
                    05:8d:57:cc:a0:4c:8f:da:f3:f4:a7:57:76:51:e2:
                    56:25
                Exponent: 65537 (0x10001)
        Attributes:
            1.3.6.1.4.1.311.13.2.1   :CertificateTemplate=CustomUserOffline
    Signature Algorithm: sha256WithRSAEncryption
         1e:4e:9b:6d:24:75:81:5f:be:52:58:ba:79:a1:ac:c8:d6:c9:
         ...
         40:2d:b6:fc

但是当我尝试certutil usercert.csr在 Windows 上验证 CSR 时，我收到以下错误：

PKCS10 Certificate Request:
Version: 1
Subject:
    CN=FirstName LastName
    OU=IT
    L=Paris
    C=FR
  Name Hash(sha1): ab6adbd772e0ca2a0fce4a32abfdd1645686c0b9
  Name Hash(md5): 21d7edb09130201e880133c245617304

Public Key Algorithm:
    Algorithm ObjectId: 1.2.840.113549.1.1.1 RSA (RSA_SIGN)
    Algorithm Parameters:
    05 00
Public Key Length: 2048 bits
Public Key: UnusedBits = 0
    0000  30 82 01 0a 02 82 01 01  00 af 85 28 40 84 d8 8a
    ...
    0100  f3 f4 a7 57 76 51 e2 56  25 02 03 01 00 01
Request Attributes: 1
  1 attributes:

  Attribute[0]: 1.3.6.1.4.1.311.13.2.1 (Enrollment Name Value Pair)
    Value[0][0], Length = 27
Cannot decode object: The data is invalid. 0x8007000d (WIN32: 13 ERROR_INVALID_DATA)
CertUtil: -dump command FAILED: 0x8007000d (WIN32: 13 ERROR_INVALID_DATA)
CertUtil: The data is invalid.

似乎自定义属性被识别为1.3.6.1.4.1.311.13.2.1 (Enrollment Name Value Pair)显示，但我猜名称/值对CertificateTemplate=CustomUserOffline的格式不正确。
我该如何解决？

一些注意事项：

• 我正在使用 OpenSSL 生成 CSR，因为最终它将是生成 CSR 的 Linux 客户端

• 我知道该certreq -attrib "CertificateTemplate:CustomUserOffline" -submit usercert.csr命令，但请求将使用 certenroll API 通过 C# 代码提交，因此我想直接在 CSR 中包含证书模板信息。

Answer 1

在您openssl.conf输入的顶部：

[ OIDs ]

certificateTemplateName = 1.3.6.1.4.1.311.20.2

在您的[req_attributes]：

certificateTemplateName = ASN1:PRINTABLESTRING:CustomUserOffline

当然，您可以跳过 OID 的定义，就像您在问题中所做的那样，直接使用 OID。

使用以下 openssl 配置文件：

oid_section = OIDs

[ OIDs ]

# This uses the short name of the template:
certificateTemplateName = 1.3.6.1.4.1.311.20.2

# Use this instead if you need to refer to the template by OID:
# certificateTemplateOID = 1.3.6.1.4.1.311.21.7  

  [ req ]

prompt             = no
string_mask        = default

# The size of the keys in bits:
default_bits       = 2048
distinguished_name = req_dn
req_extensions     = req_ext

[ req_dn ]

# Note that the following are in 'reverse order' to what you'd expect to see in
# Windows and the numbering is irrelevant as long as each line's number differs.

# Domain Components style:
# Server name:
# 2.DC = com
# 1.DC = example
# commonName = Acme Web Server

# Locality style:
# countryName = GB
# stateOrProvinceName = London
# localityName = Letsby Avenue
# organizationName = Acme
# organizationalUnitName = IT Dept
# organizationalUnitName = Web Services
# commonName = Acme Web Server

# Or traditional org style:
countryName = GB
organizationName = Acme
organizationalUnitName = IT Dept
2.organizationalUnitName = Web Services
commonName = Acme Web Server

[ req_ext ]

#basicConstraints=critical,CA:TRUE

# This requests a certificate using the 'CustomUserOffline' template.  Check with the CA for the correct name to use,
# or alternatively comment it out and let the CA apply it:
certificateTemplateName = ASN1:PRINTABLESTRING:CustomUserOffline

subjectAltName = @alt_names

[alt_names]
# To copy the CN (in the case of a DNS name in the CN) use:
# DNS = ${req_dn::commonName}
DNS.1 = www.example.com
DNS.2 = example.com

当使用查看时，这会产生以下摘录openssl req -in usercert.csr -noout -text：

    Attributes:
    Requested Extensions:
        1.3.6.1.4.1.311.20.2:
            ..CustomUserOffline

以及使用以下内容查看时的摘录certutil usercert.csr：

  Attribute[0]: 1.2.840.113549.1.9.14 (Certificate Extensions)
    Value[0][0], Length = 4d
Certificate Extensions: 2
    1.3.6.1.4.1.311.20.2: Flags = 0, Length = 13
    Certificate Template Name (Certificate Type)
        CustomUserOffline