WebRequest request = HttpWebRequest.Create(url);
var credentialCache = new CredentialCache();
credentialCache.Add(
new Uri(url), // request url
"Digest", // authentication type
new NetworkCredential("user", "password") // credentials
);
request.Credentials = credentialCache;
但是,这仅适用于没有URL参数的URL。例如,我可以下载http://example.com/test/xyz.html
就好了,但是当我尝试下载http://example.com/test?page=xyz
时,结果是400 Bad Request消息,服务器日志中有以下内容(运行Apache 2.2):
Digest: uri mismatch - </test> does not match request-uri </test?page=xyz>
我的第一个想法是摘要规范要求从摘要哈希中删除URL参数 - 但是从传递给credentialCache.Add()
的URL中删除参数并没有改变。所以它必须是相反的方式,在.NET框架中的某个地方错误地从URL中删除参数。
答案 0 :(得分:6)
你说你删除了查询字符串参数,但你是否尝试一直回到主机?我见过的每一个CredentialsCache.Add()的例子似乎只使用主机,而CredentialsCache.Add()的文档将Uri参数列为“uriPrefix”,这似乎很明显。
换句话说,试试这个:
Uri uri = new Uri(url);
WebRequest request = WebRequest.Create(uri);
var credentialCache = new CredentialCache();
credentialCache.Add(
new Uri(uri.GetLeftPart(UriPartial.Authority)), // request url's host
"Digest", // authentication type
new NetworkCredential("user", "password") // credentials
);
request.Credentials = credentialCache;
如果这样可行,您还必须确保不会多次向缓存添加相同的“权限”...对同一主机的所有请求都应该能够使用相同的凭据缓存条目。
答案 1 :(得分:3)
从这篇文章中获取的代码对我来说非常有效Implement Digest authentication via HttpWebRequest in C#
我有以下问题,当我在浏览器中浏览源URL时它要求输入用户名和密码并且工作正常,但上述代码示例中的任何一个都无法正常工作,检查请求/响应标头(在Web开发人员工具中)在firefox)我可以看到具有类型摘要授权的标题。
第1步添加:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;
using System.Text.RegularExpressions;
using System.Net;
using System.IO;
namespace NUI
{
public class DigestAuthFixer
{
private static string _host;
private static string _user;
private static string _password;
private static string _realm;
private static string _nonce;
private static string _qop;
private static string _cnonce;
private static DateTime _cnonceDate;
private static int _nc;
public DigestAuthFixer(string host, string user, string password)
{
// TODO: Complete member initialization
_host = host;
_user = user;
_password = password;
}
private string CalculateMd5Hash(
string input)
{
var inputBytes = Encoding.ASCII.GetBytes(input);
var hash = MD5.Create().ComputeHash(inputBytes);
var sb = new StringBuilder();
foreach (var b in hash)
sb.Append(b.ToString("x2"));
return sb.ToString();
}
private string GrabHeaderVar(
string varName,
string header)
{
var regHeader = new Regex(string.Format(@"{0}=""([^""]*)""", varName));
var matchHeader = regHeader.Match(header);
if (matchHeader.Success)
return matchHeader.Groups[1].Value;
throw new ApplicationException(string.Format("Header {0} not found", varName));
}
private string GetDigestHeader(
string dir)
{
_nc = _nc + 1;
var ha1 = CalculateMd5Hash(string.Format("{0}:{1}:{2}", _user, _realm, _password));
var ha2 = CalculateMd5Hash(string.Format("{0}:{1}", "GET", dir));
var digestResponse =
CalculateMd5Hash(string.Format("{0}:{1}:{2:00000000}:{3}:{4}:{5}", ha1, _nonce, _nc, _cnonce, _qop, ha2));
return string.Format("Digest username=\"{0}\", realm=\"{1}\", nonce=\"{2}\", uri=\"{3}\", " +
"algorithm=MD5, response=\"{4}\", qop={5}, nc={6:00000000}, cnonce=\"{7}\"",
_user, _realm, _nonce, dir, digestResponse, _qop, _nc, _cnonce);
}
public string GrabResponse(
string dir)
{
var url = _host + dir;
var uri = new Uri(url);
var request = (HttpWebRequest)WebRequest.Create(uri);
// If we've got a recent Auth header, re-use it!
if (!string.IsNullOrEmpty(_cnonce) &&
DateTime.Now.Subtract(_cnonceDate).TotalHours < 1.0)
{
request.Headers.Add("Authorization", GetDigestHeader(dir));
}
HttpWebResponse response;
try
{
response = (HttpWebResponse)request.GetResponse();
}
catch (WebException ex)
{
// Try to fix a 401 exception by adding a Authorization header
if (ex.Response == null || ((HttpWebResponse)ex.Response).StatusCode != HttpStatusCode.Unauthorized)
throw;
var wwwAuthenticateHeader = ex.Response.Headers["WWW-Authenticate"];
_realm = GrabHeaderVar("realm", wwwAuthenticateHeader);
_nonce = GrabHeaderVar("nonce", wwwAuthenticateHeader);
_qop = GrabHeaderVar("qop", wwwAuthenticateHeader);
_nc = 0;
_cnonce = new Random().Next(123400, 9999999).ToString();
_cnonceDate = DateTime.Now;
var request2 = (HttpWebRequest)WebRequest.Create(uri);
request2.Headers.Add("Authorization", GetDigestHeader(dir));
response = (HttpWebResponse)request2.GetResponse();
}
var reader = new StreamReader(response.GetResponseStream());
return reader.ReadToEnd();
}
}
}
第2步:调用新方法
DigestAuthFixer digest = new DigestAuthFixer(domain, username, password);
string strReturn = digest.GrabResponse(dir);
如果网址为:http://xyz.rss.com/folder/rss 然后 域名:http://xyz.rss.com(域名部分) dir:/ folder / rss(网址的其余部分)
您也可以将其作为流返回并使用XmlDocument Load()方法。
答案 2 :(得分:1)
解决方法是在apache中激活此参数:
BrowserMatch "MSIE" AuthDigestEnableQueryStringHack=On
更多信息:http://httpd.apache.org/docs/2.0/mod/mod_auth_digest.html#msie
然后在webrequest对象的代码中添加此属性:
request.UserAgent = "MSIE"
对我来说非常好用
答案 3 :(得分:0)
我认为第二个URL指向动态页面,您应首先使用GET调用它来获取HTML然后下载它。虽然没有这方面的经验。