使用`certtostore`从Golang的Windows证书存储中获取证书时出错？

Question

我想使用 Windows 证书商店中的证书包，谁能告诉我我在这里做错了什么？

我的代码：

package main

import (
    "fmt"
    "runtime"

    "github.com/google/certtostore"
)

type certmgr struct {
    certToStore certtostore.CertStorage
}

func main() {
    if runtime.GOOS == "windows" {
        var cert certmgr
        certInStore, err := cert.certToStore.Cert()
        if err != nil {
            fmt.Println("message", "Error in getting system store certificate ...")
        }

        fmt.Println("Windows System Store Certificate", *certInStore)

    }
}

我得到的错误：

panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xc0000005 code=0x0 addr=0x0 pc=0xbe2dda]

goroutine 1 [running]:
main.main()
        C:/Users/prajwal.bhagat/go/src/phoenix/mainsvc/cmd/main/test.go:17 +0x1a
exit status 2

Answer 1

您可以使用像google/certtostore这样的库，它是一个多平台包，允许您在 Linux 上使用 x509 证书和在 Windows 上使用证书存储。

它不直接获取证书包，而是使用Windows certGetCertificateChain调用，它从最终证书开始构建证书链上下文，并在可能的情况下返回到 受信任的根 CA。

它由CertWithContext()使用，它使用创建WinCertStore时提供的颁发者的值执行证书查找。
它返回证书及其 Windows 上下文，可用于执行其他操作，例如使用CertKey()查找私钥。

---

无效的内存地址或 nil 指针取消引用

您需要初始化var cert certmgr

更一般地说，您需要先获取商店，如下例所示：

    fmt.Println("open cert store")

    // Open the local cert store. Provider generally shouldn't matter, so use Software which is ubiquitous. See comments in getHostKey.
    store, err := certtostore.OpenWinCertStore(certtostore.ProviderMSSoftware, "", []string{"localhost"}, nil, false)
    
    if err != nil {
        fmt.Errorf("OpenWinCertStore: %v", err)
        return
    }   
    
    fmt.Println("get cert from cert store")
    // Obtain the first cert matching all of container/issuers/intermediates in the store.
    // This function is indifferent to the provider the store was opened with, as the store lists certs
    // from all providers.
    crt, context, err := store.CertWithContext()
    if err != nil {
        fmt.Println("failed to get cert from cert store. ", err)
        return
    }
    
    if crt == nil {
        fmt.Println("no cert")
        return
    }

    fmt.Println("get key from cert")
    // Obtain the private key from the cert. This *should* work regardless of provider because
    // the key is directly linked to the certificate.
    key, err := store.CertKey(context)
    if err != nil {
        fmt.Printf("private key not found in %s, %s", store.ProvName, err)
        return
    }

    if key == nil {
        fmt.Println("no key")
        return
    }

    fmt.Printf("find cert '%s' with private key in container '%s', algo '%s'\n", crt.Subject, key.Container, key.AlgorithmGroup)