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Throw JsonMappingException for deeply nested JSON (#2816, CVE-2020-36518) #3416
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f19edd2
Throw a checked JsonMappingException instead of an unchecked StackOve…
TaylorSMarks e7c34bc
Track depth of object being deserialized and abort if it's too deep (…
TaylorSMarks a6e8fe3
Increase the maximum depth from 256 to 1000. Update the unit tests to…
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70 changes: 70 additions & 0 deletions
70
src/test/java/com/fasterxml/jackson/databind/deser/DeepNestingUntypedDeserTest.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,70 @@ | ||
| package com.fasterxml.jackson.databind.deser; | ||
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| import com.fasterxml.jackson.core.JsonParseException; | ||
| import com.fasterxml.jackson.databind.BaseMapTest; | ||
| import com.fasterxml.jackson.databind.ObjectMapper; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
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| public class DeepNestingUntypedDeserTest extends BaseMapTest | ||
| { | ||
| // 28-Mar-2021, tatu: Currently 3000 fails for untyped/Object, | ||
| // 4000 for untyped/Array | ||
| private final static int TOO_DEEP_NESTING = 4000; | ||
| private final static int NOT_TOO_DEEP = 1000; | ||
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| private final ObjectMapper MAPPER = newJsonMapper(); | ||
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| public void testTooDeepUntypedWithArray() throws Exception | ||
| { | ||
| final String doc = _nestedDoc(TOO_DEEP_NESTING, "[ ", "] "); | ||
| try { | ||
| MAPPER.readValue(doc, Object.class); | ||
| fail("Should have thrown an exception."); | ||
| } catch (JsonParseException jpe) { | ||
| assertTrue(jpe.getMessage().startsWith("JSON is too deeply nested.")); | ||
| } | ||
| } | ||
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| public void testUntypedWithArray() throws Exception | ||
| { | ||
| final String doc = _nestedDoc(NOT_TOO_DEEP, "[ ", "] "); | ||
| Object ob = MAPPER.readValue(doc, Object.class); | ||
| assertTrue(ob instanceof List<?>); | ||
| } | ||
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| public void testTooDeepUntypedWithObject() throws Exception | ||
| { | ||
| final String doc = "{"+_nestedDoc(TOO_DEEP_NESTING, "\"x\":{", "} ") + "}"; | ||
| try { | ||
| MAPPER.readValue(doc, Object.class); | ||
| fail("Should have thrown an exception."); | ||
| } catch (JsonParseException jpe) { | ||
| assertTrue(jpe.getMessage().startsWith("JSON is too deeply nested.")); | ||
| } | ||
| } | ||
|
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| public void testUntypedWithObject() throws Exception | ||
| { | ||
| final String doc = "{"+_nestedDoc(NOT_TOO_DEEP, "\"x\":{", "} ") + "}"; | ||
| Object ob = MAPPER.readValue(doc, Object.class); | ||
| assertTrue(ob instanceof Map<?, ?>); | ||
| } | ||
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| private String _nestedDoc(int nesting, String open, String close) { | ||
| StringBuilder sb = new StringBuilder(nesting * (open.length() + close.length())); | ||
| for (int i = 0; i < nesting; ++i) { | ||
| sb.append(open); | ||
| if ((i & 31) == 0) { | ||
| sb.append("\n"); | ||
| } | ||
| } | ||
| for (int i = 0; i < nesting; ++i) { | ||
| sb.append(close); | ||
| if ((i & 31) == 0) { | ||
| sb.append("\n"); | ||
| } | ||
| } | ||
| return sb.toString(); | ||
| } | ||
| } |
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@cowtowncoder @TaylorSMarks would it make sense to add a public static method to UntypedObjectDeserializer.java that allows users to set a different limit (but still with 1000 default)?