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-rw-r--r--OpenSim/Framework/MultipartForm.cs117
-rw-r--r--OpenSim/Framework/UntrustedWebRequest.cs203
-rw-r--r--OpenSim/Framework/WebUtil.cs330
3 files changed, 650 insertions, 0 deletions
diff --git a/OpenSim/Framework/MultipartForm.cs b/OpenSim/Framework/MultipartForm.cs
new file mode 100644
index 0000000..8ba6d22
--- /dev/null
+++ b/OpenSim/Framework/MultipartForm.cs
@@ -0,0 +1,117 @@
1using System;
2using System.Collections.Generic;
3using System.Net;
4using System.IO;
5using System.Text;
6
7namespace OpenSim.Framework
8{
9 public static class MultipartForm
10 {
11 #region Helper Classes
12
13 public abstract class Element
14 {
15 public string Name;
16 }
17
18 public class File : Element
19 {
20 public string Filename;
21 public string ContentType;
22 public byte[] Data;
23
24 public File(string name, string filename, string contentType, byte[] data)
25 {
26 Name = name;
27 Filename = filename;
28 ContentType = contentType;
29 Data = data;
30 }
31 }
32
33 public class Parameter : Element
34 {
35 public string Value;
36
37 public Parameter(string name, string value)
38 {
39 Name = name;
40 Value = value;
41 }
42 }
43
44 #endregion Helper Classes
45
46 public static HttpWebResponse Post(HttpWebRequest request, List<Element> postParameters)
47 {
48 string boundary = Boundary();
49
50 // Set up the request properties
51 request.Method = "POST";
52 request.ContentType = "multipart/form-data; boundary=" + boundary;
53
54 #region Stream Writing
55
56 using (MemoryStream formDataStream = new MemoryStream())
57 {
58 foreach (var param in postParameters)
59 {
60 if (param is File)
61 {
62 File file = (File)param;
63
64 // Add just the first part of this param, since we will write the file data directly to the Stream
65 string header = string.Format("--{0}\r\nContent-Disposition: form-data; name=\"{1}\"; filename=\"{2}\";\r\nContent-Type: {3}\r\n\r\n",
66 boundary,
67 file.Name,
68 !String.IsNullOrEmpty(file.Filename) ? file.Filename : "tempfile",
69 file.ContentType);
70
71 formDataStream.Write(Encoding.UTF8.GetBytes(header), 0, header.Length);
72 formDataStream.Write(file.Data, 0, file.Data.Length);
73 }
74 else
75 {
76 Parameter parameter = (Parameter)param;
77
78 string postData = string.Format("--{0}\r\nContent-Disposition: form-data; name=\"{1}\"\r\n\r\n{2}\r\n",
79 boundary,
80 parameter.Name,
81 parameter.Value);
82 formDataStream.Write(Encoding.UTF8.GetBytes(postData), 0, postData.Length);
83 }
84 }
85
86 // Add the end of the request
87 byte[] footer = Encoding.UTF8.GetBytes("\r\n--" + boundary + "--\r\n");
88 formDataStream.Write(footer, 0, footer.Length);
89
90 request.ContentLength = formDataStream.Length;
91
92 // Copy the temporary stream to the network stream
93 formDataStream.Seek(0, SeekOrigin.Begin);
94 using (Stream requestStream = request.GetRequestStream())
95 formDataStream.CopyTo(requestStream, (int)formDataStream.Length);
96 }
97
98 #endregion Stream Writing
99
100 return request.GetResponse() as HttpWebResponse;
101 }
102
103 private static string Boundary()
104 {
105 Random rnd = new Random();
106 string formDataBoundary = String.Empty;
107
108 while (formDataBoundary.Length < 15)
109 formDataBoundary = formDataBoundary + rnd.Next();
110
111 formDataBoundary = formDataBoundary.Substring(0, 15);
112 formDataBoundary = "-----------------------------" + formDataBoundary;
113
114 return formDataBoundary;
115 }
116 }
117}
diff --git a/OpenSim/Framework/UntrustedWebRequest.cs b/OpenSim/Framework/UntrustedWebRequest.cs
new file mode 100644
index 0000000..1af7c41
--- /dev/null
+++ b/OpenSim/Framework/UntrustedWebRequest.cs
@@ -0,0 +1,203 @@
1using System;
2using System.Collections.Generic;
3using System.IO;
4using System.Net;
5using System.Net.Security;
6using System.Text;
7using log4net;
8
9namespace OpenSim.Framework
10{
11 /// <summary>
12 /// Used for requests to untrusted endpoints that may potentially be
13 /// malicious
14 /// </summary>
15 public static class UntrustedHttpWebRequest
16 {
17 /// <summary>Setting this to true will allow HTTP connections to localhost</summary>
18 private const bool DEBUG = true;
19
20 private static readonly ILog m_log =
21 LogManager.GetLogger(
22 System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
23
24 private static readonly ICollection<string> allowableSchemes = new List<string> { "http", "https" };
25
26 /// <summary>
27 /// Creates an HttpWebRequest that is hardened against malicious
28 /// endpoints after ensuring the given Uri is safe to retrieve
29 /// </summary>
30 /// <param name="uri">Web location to request</param>
31 /// <returns>A hardened HttpWebRequest if the uri was determined to be safe</returns>
32 /// <exception cref="ArgumentNullException">If uri is null</exception>
33 /// <exception cref="ArgumentException">If uri is unsafe</exception>
34 public static HttpWebRequest Create(Uri uri)
35 {
36 return Create(uri, DEBUG, 1000 * 5, 1000 * 20, 10);
37 }
38
39 /// <summary>
40 /// Creates an HttpWebRequest that is hardened against malicious
41 /// endpoints after ensuring the given Uri is safe to retrieve
42 /// </summary>
43 /// <param name="uri">Web location to request</param>
44 /// <param name="allowLoopback">True to allow connections to localhost, otherwise false</param>
45 /// <param name="readWriteTimeoutMS">Read write timeout, in milliseconds</param>
46 /// <param name="timeoutMS">Connection timeout, in milliseconds</param>
47 /// <param name="maximumRedirects">Maximum number of allowed redirects</param>
48 /// <returns>A hardened HttpWebRequest if the uri was determined to be safe</returns>
49 /// <exception cref="ArgumentNullException">If uri is null</exception>
50 /// <exception cref="ArgumentException">If uri is unsafe</exception>
51 public static HttpWebRequest Create(Uri uri, bool allowLoopback, int readWriteTimeoutMS, int timeoutMS, int maximumRedirects)
52 {
53 if (uri == null)
54 throw new ArgumentNullException("uri");
55
56 if (!IsUriAllowable(uri, allowLoopback))
57 throw new ArgumentException("Uri " + uri + " was rejected");
58
59 HttpWebRequest httpWebRequest = (HttpWebRequest)HttpWebRequest.Create(uri);
60 httpWebRequest.MaximumAutomaticRedirections = maximumRedirects;
61 httpWebRequest.ReadWriteTimeout = readWriteTimeoutMS;
62 httpWebRequest.Timeout = timeoutMS;
63 httpWebRequest.KeepAlive = false;
64
65 return httpWebRequest;
66 }
67
68 public static string PostToUntrustedUrl(Uri url, string data)
69 {
70 try
71 {
72 byte[] requestData = System.Text.Encoding.UTF8.GetBytes(data);
73
74 HttpWebRequest request = Create(url);
75 request.Method = "POST";
76 request.ContentLength = requestData.Length;
77 request.ContentType = "application/x-www-form-urlencoded";
78
79 using (Stream requestStream = request.GetRequestStream())
80 requestStream.Write(requestData, 0, requestData.Length);
81
82 using (WebResponse response = request.GetResponse())
83 {
84 using (Stream responseStream = response.GetResponseStream())
85 return responseStream.GetStreamString();
86 }
87 }
88 catch (Exception ex)
89 {
90 m_log.Warn("POST to untrusted URL " + url + " failed: " + ex.Message);
91 return null;
92 }
93 }
94
95 public static string GetUntrustedUrl(Uri url)
96 {
97 try
98 {
99 HttpWebRequest request = Create(url);
100
101 using (WebResponse response = request.GetResponse())
102 {
103 using (Stream responseStream = response.GetResponseStream())
104 return responseStream.GetStreamString();
105 }
106 }
107 catch (Exception ex)
108 {
109 m_log.Warn("GET from untrusted URL " + url + " failed: " + ex.Message);
110 return null;
111 }
112 }
113
114 /// <summary>
115 /// Determines whether a URI is allowed based on scheme and host name.
116 /// No requireSSL check is done here
117 /// </summary>
118 /// <param name="allowLoopback">True to allow loopback addresses to be used</param>
119 /// <param name="uri">The URI to test for whether it should be allowed.</param>
120 /// <returns>
121 /// <c>true</c> if [is URI allowable] [the specified URI]; otherwise, <c>false</c>.
122 /// </returns>
123 private static bool IsUriAllowable(Uri uri, bool allowLoopback)
124 {
125 if (!allowableSchemes.Contains(uri.Scheme))
126 {
127 m_log.WarnFormat("Rejecting URL {0} because it uses a disallowed scheme.", uri);
128 return false;
129 }
130
131 // Try to interpret the hostname as an IP address so we can test for internal
132 // IP address ranges. Note that IP addresses can appear in many forms
133 // (e.g. http://127.0.0.1, http://2130706433, http://0x0100007f, http://::1
134 // So we convert them to a canonical IPAddress instance, and test for all
135 // non-routable IP ranges: 10.*.*.*, 127.*.*.*, ::1
136 // Note that Uri.IsLoopback is very unreliable, not catching many of these variants.
137 IPAddress hostIPAddress;
138 if (IPAddress.TryParse(uri.DnsSafeHost, out hostIPAddress))
139 {
140 byte[] addressBytes = hostIPAddress.GetAddressBytes();
141
142 // The host is actually an IP address.
143 switch (hostIPAddress.AddressFamily)
144 {
145 case System.Net.Sockets.AddressFamily.InterNetwork:
146 if (!allowLoopback && (addressBytes[0] == 127 || addressBytes[0] == 10))
147 {
148 m_log.WarnFormat("Rejecting URL {0} because it is a loopback address.", uri);
149 return false;
150 }
151 break;
152 case System.Net.Sockets.AddressFamily.InterNetworkV6:
153 if (!allowLoopback && IsIPv6Loopback(hostIPAddress))
154 {
155 m_log.WarnFormat("Rejecting URL {0} because it is a loopback address.", uri);
156 return false;
157 }
158 break;
159 default:
160 m_log.WarnFormat("Rejecting URL {0} because it does not use an IPv4 or IPv6 address.", uri);
161 return false;
162 }
163 }
164 else
165 {
166 // The host is given by name. We require names to contain periods to
167 // help make sure it's not an internal address.
168 if (!allowLoopback && !uri.Host.Contains("."))
169 {
170 m_log.WarnFormat("Rejecting URL {0} because it does not contain a period in the host name.", uri);
171 return false;
172 }
173 }
174
175 return true;
176 }
177
178 /// <summary>
179 /// Determines whether an IP address is the IPv6 equivalent of "localhost/127.0.0.1".
180 /// </summary>
181 /// <param name="ip">The ip address to check.</param>
182 /// <returns>
183 /// <c>true</c> if this is a loopback IP address; <c>false</c> otherwise.
184 /// </returns>
185 private static bool IsIPv6Loopback(IPAddress ip)
186 {
187 if (ip == null)
188 throw new ArgumentNullException("ip");
189
190 byte[] addressBytes = ip.GetAddressBytes();
191 for (int i = 0; i < addressBytes.Length - 1; i++)
192 {
193 if (addressBytes[i] != 0)
194 return false;
195 }
196
197 if (addressBytes[addressBytes.Length - 1] != 1)
198 return false;
199
200 return true;
201 }
202 }
203}
diff --git a/OpenSim/Framework/WebUtil.cs b/OpenSim/Framework/WebUtil.cs
new file mode 100644
index 0000000..d9782ff
--- /dev/null
+++ b/OpenSim/Framework/WebUtil.cs
@@ -0,0 +1,330 @@
1using System;
2using System.Collections.Generic;
3using System.Collections.Specialized;
4using System.IO;
5using System.Net;
6using System.Net.Security;
7using System.Reflection;
8using System.Text;
9using System.Web;
10using log4net;
11using OpenSim.Framework.Servers.HttpServer;
12using OpenMetaverse.StructuredData;
13
14namespace OpenSim.Framework
15{
16 /// <summary>
17 /// Miscellaneous static methods and extension methods related to the web
18 /// </summary>
19 public static class WebUtil
20 {
21 private static readonly ILog m_log =
22 LogManager.GetLogger(
23 MethodBase.GetCurrentMethod().DeclaringType);
24
25 /// <summary>
26 /// Send LLSD to an HTTP client in application/llsd+json form
27 /// </summary>
28 /// <param name="response">HTTP response to send the data in</param>
29 /// <param name="body">LLSD to send to the client</param>
30 public static void SendJSONResponse(OSHttpResponse response, OSDMap body)
31 {
32 byte[] responseData = Encoding.UTF8.GetBytes(OSDParser.SerializeJsonString(body));
33
34 response.ContentEncoding = Encoding.UTF8;
35 response.ContentLength = responseData.Length;
36 response.ContentType = "application/llsd+json";
37 response.Body.Write(responseData, 0, responseData.Length);
38 }
39
40 /// <summary>
41 /// Send LLSD to an HTTP client in application/llsd+xml form
42 /// </summary>
43 /// <param name="response">HTTP response to send the data in</param>
44 /// <param name="body">LLSD to send to the client</param>
45 public static void SendXMLResponse(OSHttpResponse response, OSDMap body)
46 {
47 byte[] responseData = OSDParser.SerializeLLSDXmlBytes(body);
48
49 response.ContentEncoding = Encoding.UTF8;
50 response.ContentLength = responseData.Length;
51 response.ContentType = "application/llsd+xml";
52 response.Body.Write(responseData, 0, responseData.Length);
53 }
54
55 /// <summary>
56 /// Make a GET or GET-like request to a web service that returns LLSD
57 /// or JSON data
58 /// </summary>
59 public static OSDMap ServiceRequest(string url, string httpVerb)
60 {
61 string errorMessage;
62
63 try
64 {
65 HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
66 request.Method = httpVerb;
67
68 using (WebResponse response = request.GetResponse())
69 {
70 using (Stream responseStream = response.GetResponseStream())
71 {
72 try
73 {
74 string responseStr = responseStream.GetStreamString();
75 OSD responseOSD = OSDParser.Deserialize(responseStr);
76 if (responseOSD.Type == OSDType.Map)
77 return (OSDMap)responseOSD;
78 else
79 errorMessage = "Response format was invalid.";
80 }
81 catch
82 {
83 errorMessage = "Failed to parse the response.";
84 }
85 }
86 }
87 }
88 catch (Exception ex)
89 {
90 m_log.Warn("GET from URL " + url + " failed: " + ex.Message);
91 errorMessage = ex.Message;
92 }
93
94 return new OSDMap { { "Message", OSD.FromString("Service request failed. " + errorMessage) } };
95 }
96
97 /// <summary>
98 /// POST URL-encoded form data to a web service that returns LLSD or
99 /// JSON data
100 /// </summary>
101 public static OSDMap PostToService(string url, NameValueCollection data)
102 {
103 string errorMessage;
104
105 try
106 {
107 string queryString = BuildQueryString(data);
108 byte[] requestData = System.Text.Encoding.UTF8.GetBytes(queryString);
109
110 HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
111 request.Method = "POST";
112 request.ContentLength = requestData.Length;
113 request.ContentType = "application/x-www-form-urlencoded";
114
115 using (Stream requestStream = request.GetRequestStream())
116 requestStream.Write(requestData, 0, requestData.Length);
117
118 using (WebResponse response = request.GetResponse())
119 {
120 using (Stream responseStream = response.GetResponseStream())
121 {
122 try
123 {
124 string responseStr = responseStream.GetStreamString();
125 OSD responseOSD = OSDParser.Deserialize(responseStr);
126 if (responseOSD.Type == OSDType.Map)
127 return (OSDMap)responseOSD;
128 else
129 errorMessage = "Response format was invalid.";
130 }
131 catch
132 {
133 errorMessage = "Failed to parse the response.";
134 }
135 }
136 }
137 }
138 catch (Exception ex)
139 {
140 m_log.Warn("POST to URL " + url + " failed: " + ex.Message);
141 errorMessage = ex.Message;
142 }
143
144 return new OSDMap { { "Message", OSD.FromString("Service request failed. " + errorMessage) } };
145 }
146
147 #region Uri
148
149 /// <summary>
150 /// Combines a Uri that can contain both a base Uri and relative path
151 /// with a second relative path fragment
152 /// </summary>
153 /// <param name="uri">Starting (base) Uri</param>
154 /// <param name="fragment">Relative path fragment to append to the end
155 /// of the Uri</param>
156 /// <returns>The combined Uri</returns>
157 /// <remarks>This is similar to the Uri constructor that takes a base
158 /// Uri and the relative path, except this method can append a relative
159 /// path fragment on to an existing relative path</remarks>
160 public static Uri Combine(this Uri uri, string fragment)
161 {
162 string fragment1 = uri.Fragment;
163 string fragment2 = fragment;
164
165 if (!fragment1.EndsWith("/"))
166 fragment1 = fragment1 + '/';
167 if (fragment2.StartsWith("/"))
168 fragment2 = fragment2.Substring(1);
169
170 return new Uri(uri, fragment1 + fragment2);
171 }
172
173 /// <summary>
174 /// Combines a Uri that can contain both a base Uri and relative path
175 /// with a second relative path fragment. If the fragment is absolute,
176 /// it will be returned without modification
177 /// </summary>
178 /// <param name="uri">Starting (base) Uri</param>
179 /// <param name="fragment">Relative path fragment to append to the end
180 /// of the Uri, or an absolute Uri to return unmodified</param>
181 /// <returns>The combined Uri</returns>
182 public static Uri Combine(this Uri uri, Uri fragment)
183 {
184 if (fragment.IsAbsoluteUri)
185 return fragment;
186
187 string fragment1 = uri.Fragment;
188 string fragment2 = fragment.ToString();
189
190 if (!fragment1.EndsWith("/"))
191 fragment1 = fragment1 + '/';
192 if (fragment2.StartsWith("/"))
193 fragment2 = fragment2.Substring(1);
194
195 return new Uri(uri, fragment1 + fragment2);
196 }
197
198 /// <summary>
199 /// Appends a query string to a Uri that may or may not have existing
200 /// query parameters
201 /// </summary>
202 /// <param name="uri">Uri to append the query to</param>
203 /// <param name="query">Query string to append. Can either start with ?
204 /// or just containg key/value pairs</param>
205 /// <returns>String representation of the Uri with the query string
206 /// appended</returns>
207 public static string AppendQuery(this Uri uri, string query)
208 {
209 if (String.IsNullOrEmpty(query))
210 return uri.ToString();
211
212 if (query[0] == '?' || query[0] == '&')
213 query = query.Substring(1);
214
215 string uriStr = uri.ToString();
216
217 if (uriStr.Contains("?"))
218 return uriStr + '&' + query;
219 else
220 return uriStr + '?' + query;
221 }
222
223 #endregion Uri
224
225 #region NameValueCollection
226
227 /// <summary>
228 /// Convert a NameValueCollection into a query string. This is the
229 /// inverse of HttpUtility.ParseQueryString()
230 /// </summary>
231 /// <param name="parameters">Collection of key/value pairs to convert</param>
232 /// <returns>A query string with URL-escaped values</returns>
233 public static string BuildQueryString(NameValueCollection parameters)
234 {
235 List<string> items = new List<string>(parameters.Count);
236
237 foreach (string key in parameters.Keys)
238 {
239 foreach (string value in parameters.GetValues(key))
240 items.Add(String.Concat(key, "=", HttpUtility.UrlEncode(value ?? String.Empty)));
241 }
242
243 return String.Join("&", items.ToArray());
244 }
245
246 /// <summary>
247 ///
248 /// </summary>
249 /// <param name="collection"></param>
250 /// <param name="key"></param>
251 /// <returns></returns>
252 public static string GetOne(this NameValueCollection collection, string key)
253 {
254 string[] values = collection.GetValues(key);
255 if (values != null && values.Length > 0)
256 return values[0];
257
258 return null;
259 }
260
261 #endregion NameValueCollection
262
263 #region Stream
264
265 /// <summary>
266 /// Copies the contents of one stream to another, starting at the
267 /// current position of each stream
268 /// </summary>
269 /// <param name="copyFrom">The stream to copy from, at the position
270 /// where copying should begin</param>
271 /// <param name="copyTo">The stream to copy to, at the position where
272 /// bytes should be written</param>
273 /// <param name="maximumBytesToCopy">The maximum bytes to copy</param>
274 /// <returns>The total number of bytes copied</returns>
275 /// <remarks>
276 /// Copying begins at the streams' current positions. The positions are
277 /// NOT reset after copying is complete.
278 /// </remarks>
279 public static int CopyTo(this Stream copyFrom, Stream copyTo, int maximumBytesToCopy)
280 {
281 byte[] buffer = new byte[4096];
282 int readBytes;
283 int totalCopiedBytes = 0;
284
285 while ((readBytes = copyFrom.Read(buffer, 0, Math.Min(4096, maximumBytesToCopy))) > 0)
286 {
287 int writeBytes = Math.Min(maximumBytesToCopy, readBytes);
288 copyTo.Write(buffer, 0, writeBytes);
289 totalCopiedBytes += writeBytes;
290 maximumBytesToCopy -= writeBytes;
291 }
292
293 return totalCopiedBytes;
294 }
295
296 /// <summary>
297 /// Converts an entire stream to a string, regardless of current stream
298 /// position
299 /// </summary>
300 /// <param name="stream">The stream to convert to a string</param>
301 /// <returns></returns>
302 /// <remarks>When this method is done, the stream position will be
303 /// reset to its previous position before this method was called</remarks>
304 public static string GetStreamString(this Stream stream)
305 {
306 string value = null;
307
308 if (stream != null && stream.CanRead)
309 {
310 long rewindPos = -1;
311
312 if (stream.CanSeek)
313 {
314 rewindPos = stream.Position;
315 stream.Seek(0, SeekOrigin.Begin);
316 }
317
318 StreamReader reader = new StreamReader(stream);
319 value = reader.ReadToEnd();
320
321 if (rewindPos >= 0)
322 stream.Seek(rewindPos, SeekOrigin.Begin);
323 }
324
325 return value;
326 }
327
328 #endregion Stream
329 }
330}
generated by cgit v1.1 at 2024-11-10 16:23:36 +0000