Openssl invalid_purpose

Question

Openssl 生成 invalid_purpose 时会查看哪些证书字段？

我正在使用 OpenSSL 生成证书。

首先我生成一个主证书，然后是客户端证书。现在，当我尝试连接服务器时，它会生成 Invalid_Purpose。

Answer 1

有分机 keyUsage它指定了证书可以做什么。请注意，某些程序不使用此字段。

来自 X509 文档:

X509_V_ERR_INVALID_PURPOSE: unsupported certificate purpose
    the supplied certificate cannot be used for the specified purpose.

手册页 x509v3_config(5)列出参数以及另一个名为 extendedKeyUsage 的可能值:

Key Usage.
    Key usage is a multi valued extension consisting of a list of names of
    the permitted key usages.

    The supporte names are: digitalSignature, nonRepudiation,
    keyEncipherment, dataEncipherment, keyAgreement, keyCertSign, cRLSign,
    encipherOnly and decipherOnly.

    Examples:
     keyUsage=digitalSignature, nonRepudiation
     keyUsage=critical, keyCertSign 

Extended Key Usage.
    This extensions consists of a list of usages indicating purposes for
    which the certificate public key can be used for,

    These can either be object short names of the dotted numerical form of
    OIDs.  While any OID can be used only certain values make sense. In
    particular the following PKIX, NS and MS values are meaningful:

     Value                  Meaning
     -----                  -------
     serverAuth             SSL/TLS Web Server Authentication.
     clientAuth             SSL/TLS Web Client Authentication.
     codeSigning            Code signing.
     emailProtection        E-mail Protection (S/MIME).
     timeStamping           Trusted Timestamping
     msCodeInd              Microsoft Individual Code Signing (authenticode)
     msCodeCom              Microsoft Commercial Code Signing (authenticode)
     msCTLSign              Microsoft Trust List Signing
     msSGC                  Microsoft Server Gated Crypto
     msEFS                  Microsoft Encrypted File System
     nsSGC                  Netscape Server Gated Crypto

    Examples:
     extendedKeyUsage=critical,codeSigning,1.2.3.4
     extendedKeyUsage=nsSGC,msSGC