本文介绍了SAS令牌-签名字段格式不正确的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我想生成一个SAS令牌以访问我的一些媒体文件所在的blob容器.
I want to generate a SAS token for access to my blob container where are some of my media files.
所以我用以下代码创建了一个类SharedAccessSignature.java:
So I created a class SharedAccessSignature.java with this code:
public class SharedAccessSignature
{
private final String signature;
private final String signedPermission;
private final String signedStart;
private final String signedExpiry;
private final String signedIdentifier;
private final String signedIp;
private final String signedProtocol;
private final String signedVersion;
private final String signedResource;
private SharedAccessSignature(SasBuilder builder)
{
signedPermission = formatAsUrlParameter("sp", builder.signedPermission);
signedStart = formatAsUrlParameter("st", builder.signedStart);
signedExpiry = formatAsUrlParameter("se", builder.signedExpiry);
signedIdentifier = formatAsUrlParameter("si", builder.signedIdentifier);
signedIp = formatAsUrlParameter("sip", builder.signedIp);
signedProtocol = formatAsUrlParameter("spr", builder.signedProtocol);
signedVersion = formatAsUrlParameter("sv", builder.signedVersion);
signedResource = formatAsUrlParameter("sr", builder.signedResource);
signature = "sig=" + new SasBuilder().encodeUtf8(builder.signature);
}
private String formatAsUrlParameter(String parameterKey, String parameterValue)
{
if (StringUtils.isNotBlank(parameterValue))
{
return parameterKey + "=" + parameterValue + "&";
}
return "";
}
@Override
public String toString()
{
return new StringBuilder()
.append(signedVersion)
.append(signedResource)
.append(signedStart)
.append(signedExpiry)
.append(signedPermission)
.append(signedIp)
.append(signedProtocol)
.append(signedIdentifier)
.append(signature)
.toString();
}
public static class SasBuilder
{
private String signature = "";
private String signedPermission = "";
private String signedStart = "";
private String signedExpiry = "";
private String canonicalizedResource = "";
private String signedIdentifier = "";
private String signedIp = "";
private String signedProtocol = "";
private String signedVersion = "";
private String signedResource = "";
public SasBuilder signedVersion(String signedVersion)
{
this.signedVersion = signedVersion;
return this;
}
public SasBuilder signedPermission(String signedPermission)
{
this.signedPermission = signedPermission;
return this;
}
public SasBuilder canonicalizedResource(String canonicalizedResource)
{
this.canonicalizedResource = canonicalizedResource;
return this;
}
public SasBuilder signedIp(String signedIp)
{
this.signedIp = signedIp;
return this;
}
public SasBuilder signedProtocol(String signedProtocol)
{
this.signedProtocol = signedProtocol;
return this;
}
public SasBuilder signedIdentifier(String signedIdentifier)
{
this.signedIdentifier = signedIdentifier;
return this;
}
public SasBuilder signedExpiry(String signedExpiry)
{
this.signedExpiry = signedExpiry;
return this;
}
public SasBuilder signedStart(String signedStart)
{
this.signedStart = signedStart;
return this;
}
public SasBuilder signedResource(String signedResource)
{
this.signedResource = signedResource;
return this;
}
public SharedAccessSignature build()
{
String toBeAsEnvironmentVariable_securityKey = "....";
signature = generateSasSignature(toBeAsEnvironmentVariable_securityKey, stringToSign());
checkPreconditions();
return new SharedAccessSignature(this);
}
private String generateSasSignature(String key, String input)
{
SecretKeySpec secret_key = new SecretKeySpec(key.getBytes(), "HmacSHA256");
Encoder encoder = Base64.getEncoder();
Mac sha256_HMAC = null;
String hash = null;
try
{
sha256_HMAC = Mac.getInstance("HmacSHA256");
sha256_HMAC.init(secret_key);
hash = new String(encoder.encode(sha256_HMAC.doFinal(input.getBytes("UTF-8"))));
}
catch (InvalidKeyException | NoSuchAlgorithmException | IllegalStateException | UnsupportedEncodingException e)
{
e.printStackTrace();
}
return hash;
}
private String stringToSign()
{
StringBuilder strToSign = new StringBuilder();
strToSign.append(signedPermission).append("\n");
strToSign.append(signedStart).append("\n");
strToSign.append(signedExpiry).append("\n");
strToSign.append(canonicalizedResource).append("\n");
strToSign.append(signedIdentifier).append("\n");
strToSign.append(signedIp).append("\n");
strToSign.append(signedProtocol).append("\n");
strToSign.append(signedVersion).append("\n");
strToSign.append("").append("\n");
strToSign.append("").append("\n");
strToSign.append("").append("\n");
strToSign.append("").append("\n");
strToSign.append("");
return strToSign.toString();
}
private void checkPreconditions()
{
if (StringUtils.isBlank(signedVersion) || StringUtils.isBlank(signedResource) || StringUtils.isBlank(signedPermission) || StringUtils.isBlank(signedExpiry) || StringUtils.isBlank(signature))
{
throw new IllegalStateException("SAS Builder: SignedVersion, signedResource, SignedPermission, SignedExpiry, Signature must be set.");
}
}
private String encodeUtf8(String textToBeEncoded)
{
try
{
return URLEncoder.encode(textToBeEncoded, "UTF-8");
}
catch (UnsupportedEncodingException e)
{
e.printStackTrace();
}
return textToBeEncoded;
}
}
}
然后我尝试生成这样的SAS令牌:
And then I try to generate a SAS token like this:
SharedAccessSignature s = new SharedAccessSignature.SasBuilder()
.signedPermission("rwd")
.signedStart("2018-01-31T10:48:41Z")
.signedExpiry("2018-04-06T18:48:41Z")
.signedVersion("2015-04-05")
.signedResource("b")
.canonicalizedResource("/blob/myaccount")
.signedProtocol("https")
.build();
结果:
sv=2015-04-05&sr=b&st=2018-01-31T10:48:41Z&se=2018-04-06T18:48:41Z&sp=rwd&spr=https&sig=kd09Y%2FTL5V%2F570VWRuEfq7XbEHvcgo4Z%2F2y9t4OswY8%3D
获取请求:
https://account.blob.core.cloudapi.de/container/filename.mp4?sv=2015-04-05&sr=b&st=2018-01-31T10:48:41Z&se=2018-04-06T18:48:41Z&sp=rwd&spr=https&sig=kd09Y%2FTL5V%2F570VWRuEfq7XbEHvcgo4Z%2F2y9t4OswY8%3D
但是，当我使用生成的令牌发送该请求时，天蓝色就出现了此错误:
But as I am sending that request with this generated token there commes this Error from azure:
<Error>
<Code>AuthenticationFailed</Code>
<Message>
Server failed to authenticate the request. Make sure the value of
Authorization header is formed correctly including the signature.
</Message>
<AuthenticationErrorDetail>
Signature did not match. String to sign used was rwd 2018-01-31T10:48:41Z
2018-04-06T18:48:41Z /blob/globalweb/..... https 2015-04-05
</AuthenticationErrorDetail>
</Error>
我很拼命...我不明白...这个字符串签名"出了什么问题?为什么签名不匹配"?
I am desperate... I don´t understand it... What is wrong on this "string-to-sign"? Why the "Signature did not match"?
--------
rwd\n
2018-01-31T10:48:41Z\n
2018-04-06T18:48:41Z\n
/blob/globalweb/videos-martindale\n
\n
\n
https\n
2015-04-05\n
\n
\n
\n
\n
-------
//link: https://globalweb.blob.core.cloudapi.de/videos-martindale/somevideo.mp4?sv=2015-04-05&sr=c&st=2018-01-31T10:48:41Z&se=2018-04-06T18:48:41Z&sp=rwd&spr=https&sig=kd09Y%2FTL5V%2F570VWRuEfq7XbEHvcgo4Z%2F2y9t4OswY8%3D
<Error>
<Code>AuthenticationFailed</Code>
<Message>
Server failed to authenticate the request. Make sure the value of Authorization header is formed correctly including the signature. RequestId:644e47a6-001e-0050-3f20-abc0f0000000 Time:2018-02-21T14:31:10.9429817Z
</Message>
<AuthenticationErrorDetail>
Signature did not match. String to sign used was rwd 2018-01-31T10:48:41Z 2018-04-06T18:48:41Z /blob/globalweb/videos-martindale https 2015-04-05
</AuthenticationErrorDetail>
</Error>
推荐答案
主要问题在于您的 generateSasSignature 方法.它应该解码来自 Base64 的密钥.如下所示:
The main problem is on you generateSasSignature method. It should decode the key from Base64. Like the following:
public static String generateSasSignature(String key, String input) {
SecretKeySpec secret_key = new SecretKeySpec(Base64.getDecoder().decode(key), "HmacSHA256");
Encoder encoder = Base64.getEncoder();
Mac sha256_HMAC = null;
String hash = null;
try {
sha256_HMAC = Mac.getInstance("HmacSHA256");
sha256_HMAC.init(secret_key);
hash = new String(encoder.encode(sha256_HMAC.doFinal(input.getBytes("UTF-8"))));
}
catch (InvalidKeyException | NoSuchAlgorithmException | IllegalStateException | UnsupportedEncodingException e) {
e.printStackTrace();
}
return hash;
}
然后，假设您有兴趣访问名为 mycontainer 的容器，则应该这样做:
Then, assuming you're interested in having access to the container called mycontainer, this is how you should do:
SharedAccessSignature s = new SharedAccessSignature.SasBuilder()
.signedPermission("rwd")
.signedStart("2018-01-31T10:48:41Z")
.signedExpiry("2018-04-06T18:48:41Z")
.signedVersion("2015-04-05")
.signedResource("c") // <<---- note here
.canonicalizedResource("/blob/globalweb/mycontainer") // No ending slash!
.signedProtocol("https")
.build();
但是，如果要生成帐户SAS，则以下代码可以解决问题:
However, if you want to generate an Account SAS, the following code does the trick:
public static void main(String[] args) throws UnsupportedEncodingException {
String accountName = "globalweb";
String signedPermissions = "rl"; //read and list
String signedService = "b"; //blob
String signedResType = "sco"; //service, container, objects
String start = "2018-02-22T17:16:25Z";
String expiry = "2018-02-28T01:16:25Z";
String signedIp = "";
String protocol = "https";
String signedVersion = "2017-07-29";
String stringToSign =
accountName + "\n" +
signedPermissions + "\n" +
signedService + "\n" +
signedResType + "\n" +
start + "\n" +
expiry + "\n" +
signedIp + "\n" +
protocol + "\n" +
signedVersion + "\n";
//outputs SAS Token
System.out.println(
"?sv="+signedVersion +
"&ss="+signedService +
"&srt="+signedResType +
"&sp="+signedPermissions +
"&st="+start+
"&se="+expiry+
"&spr="+protocol+
"&sig="+
URLEncoder.encode(SasBuilder.generateSasSignature(MY_KEY_BASE64, stringToSign), "UTF-8"));
}
这篇关于SAS令牌-签名字段格式不正确的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！