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Handle mismatched cookie chunk counts #463

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merged 1 commit into from May 10, 2022
Merged

Handle mismatched cookie chunk counts #463

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18 changes: 14 additions & 4 deletions src/Microsoft.Owin/Infrastructure/ChunkingCookieManager.cs
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Expand Up @@ -73,7 +73,7 @@ public string GetRequestCookie(IOwinContext context, string key)
if (chunksCount > 0)
{
bool quoted = false;
string[] chunks = new string[chunksCount];
var chunks = new List<string>(10); // chunksCount may be wrong, don't trust it.
for (int chunkId = 1; chunkId <= chunksCount; chunkId++)
{
string chunk = requestCookies[key + "C" + chunkId.ToString(CultureInfo.InvariantCulture)];
Expand All @@ -98,7 +98,8 @@ public string GetRequestCookie(IOwinContext context, string key)
quoted = true;
chunk = RemoveQuotes(chunk);
}
chunks[chunkId - 1] = chunk;

chunks.Add(chunk);
}
string merged = string.Join(string.Empty, chunks);
if (quoted)
Expand Down Expand Up @@ -236,13 +237,22 @@ public void DeleteCookie(IOwinContext context, string key, CookieOptions options
List<string> keys = new List<string>();
keys.Add(escapedKey + "=");

string requestCookie = context.Request.Cookies[key];
int chunks = ParseChunksCount(requestCookie);
var requestCookies = context.Request.Cookies;
var requestCookie = requestCookies[key];
long chunks = ParseChunksCount(requestCookie);
if (chunks > 0)
{
for (int i = 1; i <= chunks + 1; i++)
{
string subkey = escapedKey + "C" + i.ToString(CultureInfo.InvariantCulture);

// Only delete cookies we received. We received the chunk count cookie so we should have received the others too.
if (string.IsNullOrEmpty(requestCookies[subkey]))
{
chunks = i - 1;
break;
}

keys.Add(subkey + "=");
}
}
Expand Down
35 changes: 34 additions & 1 deletion tests/Microsoft.Owin.Tests/CookieChunkingTests.cs
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Expand Up @@ -146,7 +146,7 @@ public void GetLargeChunkedCookieWithMissingChunk_ThrowingDisabled_NotReassemble
public void DeleteChunkedCookieWithOptions_AllDeleted()
{
IOwinContext context = new OwinContext();
context.Request.Headers.AppendValues("Cookie", "TestCookie=chunks:7");
context.Request.Headers.AppendValues("Cookie", "TestCookie=chunks:7;TestCookieC1=1;TestCookieC2=2;TestCookieC3=3;TestCookieC4=4;TestCookieC5=5;TestCookieC6=6;TestCookieC7=7");

new ChunkingCookieManager().DeleteCookie(context, "TestCookie", new CookieOptions() { Domain = "foo.com" });
var cookies = context.Response.Headers.GetValues("Set-Cookie");
Expand All @@ -163,5 +163,38 @@ public void DeleteChunkedCookieWithOptions_AllDeleted()
"TestCookieC7=; domain=foo.com; path=/; expires=Thu, 01-Jan-1970 00:00:00 GMT",
}, cookies);
}

[Fact]
public void DeleteChunkedCookieWithMissingRequestCookies_OnlyPresentCookiesDeleted()
{
IOwinContext context = new OwinContext();
context.Request.Headers.Append("Cookie", "TestCookie=chunks:7;TestCookieC1=1;TestCookieC2=2");
new ChunkingCookieManager().DeleteCookie(context, "TestCookie", new CookieOptions() { Domain = "foo.com", Secure = true });
var cookies = context.Response.Headers.GetValues("Set-Cookie");
Assert.Equal(3, cookies.Count);
Assert.Equal(new[]
{
"TestCookie=; domain=foo.com; path=/; expires=Thu, 01-Jan-1970 00:00:00 GMT; secure",
"TestCookieC1=; domain=foo.com; path=/; expires=Thu, 01-Jan-1970 00:00:00 GMT; secure",
"TestCookieC2=; domain=foo.com; path=/; expires=Thu, 01-Jan-1970 00:00:00 GMT; secure",
}, cookies);
}

[Fact]
public void DeleteChunkedCookieWithMissingRequestCookies_StopsAtMissingChunk()
{
IOwinContext context = new OwinContext();
// C3 is missing so we don't try to delete C4 either.
context.Request.Headers.Append("Cookie", "TestCookie=chunks:7;TestCookieC1=1;TestCookieC2=2;TestCookieC4=4");
new ChunkingCookieManager().DeleteCookie(context, "TestCookie", new CookieOptions() { Domain = "foo.com", Secure = true });
var cookies = context.Response.Headers.GetValues("Set-Cookie");
Assert.Equal(3, cookies.Count);
Assert.Equal(new[]
{
"TestCookie=; domain=foo.com; path=/; expires=Thu, 01-Jan-1970 00:00:00 GMT; secure",
"TestCookieC1=; domain=foo.com; path=/; expires=Thu, 01-Jan-1970 00:00:00 GMT; secure",
"TestCookieC2=; domain=foo.com; path=/; expires=Thu, 01-Jan-1970 00:00:00 GMT; secure",
}, cookies);
}
}
}