SNOW-944715 Validate account domain to avoid SSRF

snowflakedb · Nov 23, 2023 · 4cf505d · 4cf505d
1 parent 62f2206
commit 4cf505d
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Showing 2 changed files with 58 additions and 6 deletions.
diff --git a/Snowflake.Data.Tests/UnitTests/SFSessionPropertyTest.cs b/Snowflake.Data.Tests/UnitTests/SFSessionPropertyTest.cs
@@ -14,7 +14,7 @@ namespace Snowflake.Data.Tests.UnitTests
     class SFSessionPropertyTest
     {
 
-        [Test, TestCaseSource("ConnectionStringTestCases")]
+        [Test, TestCaseSource(nameof(ConnectionStringTestCases))]
         public void TestThatPropertiesAreParsed(TestCase testcase)
         {
             // act
@@ -29,7 +29,10 @@ public void TestThatPropertiesAreParsed(TestCase testcase)
         [Test]
         [TestCase("ACCOUNT=testaccount;USER=testuser;PASSWORD=testpassword;FILE_TRANSFER_MEMORY_THRESHOLD=0;", "Error: Invalid parameter value 0 for FILE_TRANSFER_MEMORY_THRESHOLD")]
         [TestCase("ACCOUNT=testaccount;USER=testuser;PASSWORD=testpassword;FILE_TRANSFER_MEMORY_THRESHOLD=xyz;", "Error: Invalid parameter value xyz for FILE_TRANSFER_MEMORY_THRESHOLD")]
-        public void TestThatItFailsForWrongFileTransferMaxBytesInMemoryParameter(string connectionString, string expectedErrorMessagePart)
+        [TestCase("ACCOUNT=testaccount?;USER=testuser;PASSWORD=testpassword", "Error: Invalid parameter value testaccount? for ACCOUNT")]
+        [TestCase("ACCOUNT=complicated.long.testaccount?;USER=testuser;PASSWORD=testpassword", "Error: Invalid parameter value complicated.long.testaccount? for ACCOUNT")]
+        [TestCase("ACCOUNT=?testaccount;USER=testuser;PASSWORD=testpassword", "Error: Invalid parameter value ?testaccount for ACCOUNT")]
+        public void TestThatItFailsForWrongConnectionParameter(string connectionString, string expectedErrorMessagePart)
         {
             // act
             var exception = Assert.Throws<SnowflakeDbException>(
@@ -260,6 +263,34 @@ public static IEnumerable<TestCase> ConnectionStringTestCases()
                 ConnectionString =
                     $"ACCOUNT={defAccount};USER={defUser};PASSWORD={defPassword};DISABLEQUERYCONTEXTCACHE=true"
             };
+            var complicatedAccount = $"{defAccount}.region-name.host-name";
+            var complicatedAccountTestCase = new TestCase()
+            {
+                ConnectionString = $"ACCOUNT={complicatedAccount};USER={defUser};PASSWORD={defPassword};",
+                ExpectedProperties = new SFSessionProperties()
+                {
+                    { SFSessionProperty.ACCOUNT, defAccount },
+                    { SFSessionProperty.USER, defUser },
+                    { SFSessionProperty.HOST, $"{complicatedAccount}.snowflakecomputing.com" },
+                    { SFSessionProperty.AUTHENTICATOR, defAuthenticator },
+                    { SFSessionProperty.SCHEME, defScheme },
+                    { SFSessionProperty.CONNECTION_TIMEOUT, defConnectionTimeout },
+                    { SFSessionProperty.PASSWORD, defPassword },
+                    { SFSessionProperty.PORT, defPort },
+                    { SFSessionProperty.VALIDATE_DEFAULT_PARAMETERS, "true" },
+                    { SFSessionProperty.USEPROXY, "false" },
+                    { SFSessionProperty.INSECUREMODE, "false" },
+                    { SFSessionProperty.DISABLERETRY, "false" },
+                    { SFSessionProperty.FORCERETRYON404, "false" },
+                    { SFSessionProperty.CLIENT_SESSION_KEEP_ALIVE, "false" },
+                    { SFSessionProperty.FORCEPARSEERROR, "false" },
+                    { SFSessionProperty.BROWSER_RESPONSE_TIMEOUT, defBrowserResponseTime },
+                    { SFSessionProperty.RETRY_TIMEOUT, defRetryTimeout },
+                    { SFSessionProperty.MAXHTTPRETRIES, defMaxHttpRetries },
+                    { SFSessionProperty.INCLUDERETRYREASON, defIncludeRetryReason },
+                    { SFSessionProperty.DISABLEQUERYCONTEXTCACHE, defDisableQueryContextCache }
+                }
+            };
             return new TestCase[]
             {
                 simpleTestCase,
@@ -268,7 +299,8 @@ public static IEnumerable<TestCase> ConnectionStringTestCases()
                 testCaseThatDefaultForUseProxyIsFalse,
                 testCaseWithFileTransferMaxBytesInMemory,
                 testCaseWithIncludeRetryReason,
-                testCaseWithDisableQueryContextCache
+                testCaseWithDisableQueryContextCache,
+                complicatedAccountTestCase
             };
         }
 

diff --git a/Snowflake.Data/Core/Session/SFSessionProperty.cs b/Snowflake.Data/Core/Session/SFSessionProperty.cs
@@ -11,6 +11,7 @@
 using Snowflake.Data.Core.Authenticator;
 using System.Data.Common;
 using System.Linq;
+using System.Text.RegularExpressions;
 
 namespace Snowflake.Data.Core
 {
@@ -101,17 +102,19 @@ class SFSessionPropertyAttr : Attribute
 
     class SFSessionProperties : Dictionary<SFSessionProperty, String>
     {
-        static private SFLogger logger = SFLoggerFactory.GetLogger<SFSessionProperties>();
+        private static SFLogger logger = SFLoggerFactory.GetLogger<SFSessionProperties>();
 
         // Connection string properties to obfuscate in the log
-        static private List<SFSessionProperty> secretProps =
+        private static List<SFSessionProperty> secretProps =
             new List<SFSessionProperty>{
                 SFSessionProperty.PASSWORD,
                 SFSessionProperty.PRIVATE_KEY,
                 SFSessionProperty.TOKEN,
                 SFSessionProperty.PRIVATE_KEY_PWD,
                 SFSessionProperty.PROXYPASSWORD,
             };
+
+        private const string AccountRegexString = "^\\w[\\w.-]+\\w$";
 
         public override bool Equals(object obj)
         {
@@ -251,7 +254,8 @@ internal static SFSessionProperties parseConnectionString(String connectionStrin
 
             checkSessionProperties(properties);
             ValidateFileTransferMaxBytesInMemoryProperty(properties);
-
+            ValidateAccountDomain(properties);
+
             // compose host value if not specified
             if (!properties.ContainsKey(SFSessionProperty.HOST) ||
                 (0 == properties[SFSessionProperty.HOST].Length))
@@ -271,6 +275,22 @@ internal static SFSessionProperties parseConnectionString(String connectionStrin
             return properties;
         }
 
+        private static void ValidateAccountDomain(SFSessionProperties properties)
+        {
+            var account = properties[SFSessionProperty.ACCOUNT];
+            if (string.IsNullOrEmpty(account))
+                return;
+            var match = Regex.Match(account, AccountRegexString, RegexOptions.IgnoreCase);
+            if (match.Success)
+                return;
+            logger.Error($"Invalid account {account}");
+            throw new SnowflakeDbException(
+                new Exception($"Invalid account"),
+                SFError.INVALID_CONNECTION_PARAMETER_VALUE,
+                account,
+                SFSessionProperty.ACCOUNT);
+        }
+
         private static void checkSessionProperties(SFSessionProperties properties)
         {
             foreach (SFSessionProperty sessionProperty in Enum.GetValues(typeof(SFSessionProperty)))