ObjFW  Check-in [c0d8a3426c]

Overview
Comment:Add depth limit for MessagePack
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Files: files | file ages | folders
SHA3-256: c0d8a3426cce307995c0b17bd6a8c2e93a20944349c7e20bb195891e96219fd1
User & Date: js on 2017-05-13 23:27:40
Other Links: manifest | tags
Context
2017-05-14
00:11
Small optimization for objc_storeStrong() check-in: 9d12f9759f user: js tags: trunk
2017-05-13
23:27
Add depth limit for MessagePack check-in: c0d8a3426c user: js tags: trunk
22:38
Reduce retain + autorelease check-in: 504e13cf00 user: js tags: trunk
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Modified src/OFDataArray+MessagePackValue.h from [87bd9c3480] to [19398bebc1].

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@interface OFDataArray (MessagePackValue)
/*!
 * @brief Parses the MessagePack representation and returns it as an object.
 *
 * @return The MessagePack representation as an object
 */
- (id)messagePackValue;









@end

OF_ASSUME_NONNULL_END








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@interface OFDataArray (MessagePackValue)
/*!
 * @brief Parses the MessagePack representation and returns it as an object.
 *
 * @return The MessagePack representation as an object
 */
- (id)messagePackValue;

/*!
 * @brief Parses the MessagePack representation and returns it as an object.
 *
 * @param depthLimit The maximum depth the parser should accept (defaults to 32
 *		     if not specified, 0 means no limit (insecure!))
 * @return The MessagePack representation as an object
 */
- (id)messagePackValueWithDepthLimit: (size_t)depthLimit;
@end

OF_ASSUME_NONNULL_END

Modified src/OFDataArray+MessagePackValue.m from [d21c98d61f] to [c085900a12].

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#import "OFDictionary.h"
#import "OFMessagePackExtension.h"

#import "OFInvalidFormatException.h"

int _OFDataArray_MessagePackValue_reference;

static size_t parseObject(const uint8_t *, size_t, id *);


static uint16_t
readUInt16(const uint8_t *buffer)
{
	return ((uint16_t)buffer[0] << 8) | buffer[1];
}









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#import "OFDictionary.h"
#import "OFMessagePackExtension.h"

#import "OFInvalidFormatException.h"

int _OFDataArray_MessagePackValue_reference;

static size_t parseObject(const uint8_t *buffer, size_t length, id *object,
    size_t depthLimit);

static uint16_t
readUInt16(const uint8_t *buffer)
{
	return ((uint16_t)buffer[0] << 8) | buffer[1];
}
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	return ((uint64_t)buffer[0] << 56) | ((uint64_t)buffer[1] << 48) |
	    ((uint64_t)buffer[2] << 40) | ((uint64_t)buffer[3] << 32) |
	    ((uint64_t)buffer[4] << 24) | ((uint64_t)buffer[5] << 16) |
	    ((uint64_t)buffer[6] << 8) | buffer[7];
}

static size_t
parseArray(const uint8_t *buffer, size_t length, id *object, size_t count)

{
	void *pool;
	size_t pos = 0;






	/*
	 * Don't use capacity! For data and strings, this is safe, as we can
	 * check if we still have enough bytes left. For an array however, we
	 * can't know this, as every child can be more than one byte.
	 */
	*object = [OFMutableArray array];

	for (size_t i = 0; i < count; i++) {
		id child;
		size_t childLength;

		pool = objc_autoreleasePoolPush();

		childLength = parseObject(buffer + pos, length - pos, &child);

		if (childLength == 0 || child == nil) {
			objc_autoreleasePoolPop(pool);

			*object = nil;
			return 0;
		}
		pos += childLength;

		[*object addObject: child];

		objc_autoreleasePoolPop(pool);
	}

	return pos;
}

static size_t
parseTable(const uint8_t *buffer, size_t length, id *object, size_t count)

{
	void *pool;
	size_t pos = 0;






	/*
	 * Don't use capacity! For data and strings, this is safe, as we can
	 * check if we still have enough bytes left. For a dictionary however,
	 * we can't know this, as every key / value can be more than one byte.
	 */
	*object = [OFMutableDictionary dictionary];

	for (size_t i = 0; i < count; i++) {
		id key, value;
		size_t keyLength, valueLength;

		pool = objc_autoreleasePoolPush();

		keyLength = parseObject(buffer + pos, length - pos, &key);

		if (keyLength == 0 || key == nil) {
			objc_autoreleasePoolPop(pool);

			*object = nil;
			return 0;
		}
		pos += keyLength;

		valueLength = parseObject(buffer + pos, length - pos, &value);

		if (valueLength == 0 || value == nil) {
			objc_autoreleasePoolPop(pool);

			*object = nil;
			return 0;
		}
		pos += valueLength;

		[*object setObject: value
			    forKey: key];

		objc_autoreleasePoolPop(pool);
	}

	return pos;
}

static size_t
parseObject(const uint8_t *buffer, size_t length, id *object)

{
	size_t count;
	int8_t type;
	OFDataArray *data;

	if (length < 1)
		goto error;








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	return ((uint64_t)buffer[0] << 56) | ((uint64_t)buffer[1] << 48) |
	    ((uint64_t)buffer[2] << 40) | ((uint64_t)buffer[3] << 32) |
	    ((uint64_t)buffer[4] << 24) | ((uint64_t)buffer[5] << 16) |
	    ((uint64_t)buffer[6] << 8) | buffer[7];
}

static size_t
parseArray(const uint8_t *buffer, size_t length, id *object, size_t count,
    size_t depthLimit)
{
	void *pool;
	size_t pos = 0;

	if (--depthLimit == 0) {
		*object = nil;
		return 0;
	}

	/*
	 * Don't use capacity! For data and strings, this is safe, as we can
	 * check if we still have enough bytes left. For an array however, we
	 * can't know this, as every child can be more than one byte.
	 */
	*object = [OFMutableArray array];

	for (size_t i = 0; i < count; i++) {
		id child;
		size_t childLength;

		pool = objc_autoreleasePoolPush();

		childLength = parseObject(buffer + pos, length - pos, &child,
		    depthLimit);
		if (childLength == 0 || child == nil) {
			objc_autoreleasePoolPop(pool);

			*object = nil;
			return 0;
		}
		pos += childLength;

		[*object addObject: child];

		objc_autoreleasePoolPop(pool);
	}

	return pos;
}

static size_t
parseTable(const uint8_t *buffer, size_t length, id *object, size_t count,
    size_t depthLimit)
{
	void *pool;
	size_t pos = 0;

	if (--depthLimit == 0) {
		*object = nil;
		return 0;
	}

	/*
	 * Don't use capacity! For data and strings, this is safe, as we can
	 * check if we still have enough bytes left. For a dictionary however,
	 * we can't know this, as every key / value can be more than one byte.
	 */
	*object = [OFMutableDictionary dictionary];

	for (size_t i = 0; i < count; i++) {
		id key, value;
		size_t keyLength, valueLength;

		pool = objc_autoreleasePoolPush();

		keyLength = parseObject(buffer + pos, length - pos, &key,
		    depthLimit);
		if (keyLength == 0 || key == nil) {
			objc_autoreleasePoolPop(pool);

			*object = nil;
			return 0;
		}
		pos += keyLength;

		valueLength = parseObject(buffer + pos, length - pos, &value,
		    depthLimit);
		if (valueLength == 0 || value == nil) {
			objc_autoreleasePoolPop(pool);

			*object = nil;
			return 0;
		}
		pos += valueLength;

		[*object setObject: value
			    forKey: key];

		objc_autoreleasePoolPop(pool);
	}

	return pos;
}

static size_t
parseObject(const uint8_t *buffer, size_t length, id *object,
    size_t depthLimit)
{
	size_t count;
	int8_t type;
	OFDataArray *data;

	if (length < 1)
		goto error;
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				  length: count];
		return count + 1;
	}

	/* fixarray */
	if ((buffer[0] & 0xF0) == 0x90)
		return parseArray(buffer + 1, length - 1, object,
		    buffer[0] & 0xF) + 1;

	/* fixmap */
	if ((buffer[0] & 0xF0) == 0x80)
		return parseTable(buffer + 1, length - 1, object,
		    buffer[0] & 0xF) + 1;

	/* Prefix byte */
	switch (*buffer) {
	/* Unsigned integers */
	case 0xCC: /* uint8 */
		if (length < 2)
			goto error;








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				  length: count];
		return count + 1;
	}

	/* fixarray */
	if ((buffer[0] & 0xF0) == 0x90)
		return parseArray(buffer + 1, length - 1, object,
		    buffer[0] & 0xF, depthLimit) + 1;

	/* fixmap */
	if ((buffer[0] & 0xF0) == 0x80)
		return parseTable(buffer + 1, length - 1, object,
		    buffer[0] & 0xF, depthLimit) + 1;

	/* Prefix byte */
	switch (*buffer) {
	/* Unsigned integers */
	case 0xCC: /* uint8 */
		if (length < 2)
			goto error;
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			    extensionWithType: type
					 data: data];
		} @finally {
			[data release];
		}

		return 4;
	case 0xD6: /* fixtext 4 */
		if (length < 6)
			goto error;

		type = buffer[1];

		data = [[OFDataArray alloc] initWithCapacity: 4];
		@try {
			[data addItems: buffer + 2
				 count: 4];

			*object = [OFMessagePackExtension
			    extensionWithType: type
					 data: data];
		} @finally {
			[data release];
		}

		return 6;
	case 0xD7: /* fixtext 8 */
		if (length < 10)
			goto error;

		type = buffer[1];

		data = [[OFDataArray alloc] initWithCapacity: 8];
		@try {








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			    extensionWithType: type
					 data: data];
		} @finally {
			[data release];
		}

		return 4;
	case 0xD6: /* fixext 4 */
		if (length < 6)
			goto error;

		type = buffer[1];

		data = [[OFDataArray alloc] initWithCapacity: 4];
		@try {
			[data addItems: buffer + 2
				 count: 4];

			*object = [OFMessagePackExtension
			    extensionWithType: type
					 data: data];
		} @finally {
			[data release];
		}

		return 6;
	case 0xD7: /* fixext 8 */
		if (length < 10)
			goto error;

		type = buffer[1];

		data = [[OFDataArray alloc] initWithCapacity: 8];
		@try {
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		return count + 5;
	/* Arrays */
	case 0xDC: /* array 16 */
		if (length < 3)
			goto error;

		return parseArray(buffer + 3, length - 3, object,
		    readUInt16(buffer + 1)) + 3;
	case 0xDD: /* array 32 */
		if (length < 5)
			goto error;

		return parseArray(buffer + 5, length - 5, object,
		    readUInt32(buffer + 1)) + 5;
	/* Maps */
	case 0xDE: /* map 16 */
		if (length < 3)
			goto error;

		return parseTable(buffer + 3, length - 3, object,
		    readUInt16(buffer + 1)) + 3;
	case 0xDF: /* map 32 */
		if (length < 5)
			goto error;

		return parseTable(buffer + 5, length - 5, object,
		    readUInt32(buffer + 1)) + 5;
	}

error:
	*object = nil;
	return 0;
}

@implementation OFDataArray (MessagePackValue)
- (id)messagePackValue
{






	size_t count = [self count];
	id object;

	if (parseObject([self items], count, &object) != count ||
	    object == nil)
		@throw [OFInvalidFormatException exception];





	return object;
}
@end








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		return count + 5;
	/* Arrays */
	case 0xDC: /* array 16 */
		if (length < 3)
			goto error;

		return parseArray(buffer + 3, length - 3, object,
		    readUInt16(buffer + 1), depthLimit) + 3;
	case 0xDD: /* array 32 */
		if (length < 5)
			goto error;

		return parseArray(buffer + 5, length - 5, object,
		    readUInt32(buffer + 1), depthLimit) + 5;
	/* Maps */
	case 0xDE: /* map 16 */
		if (length < 3)
			goto error;

		return parseTable(buffer + 3, length - 3, object,
		    readUInt16(buffer + 1), depthLimit) + 3;
	case 0xDF: /* map 32 */
		if (length < 5)
			goto error;

		return parseTable(buffer + 5, length - 5, object,
		    readUInt32(buffer + 1), depthLimit) + 5;
	}

error:
	*object = nil;
	return 0;
}

@implementation OFDataArray (MessagePackValue)
- (id)messagePackValue
{
	return [self messagePackValueWithDepthLimit: 32];
}

- (id)messagePackValueWithDepthLimit: (size_t)depthLimit
{
	void *pool = objc_autoreleasePoolPush();
	size_t count = [self count];
	id object;

	if (parseObject([self items], count, &object, depthLimit) != count ||
	    object == nil)
		@throw [OFInvalidFormatException exception];

	[object retain];

	objc_autoreleasePoolPop(pool);

	return object;
}
@end

Modified src/OFString+JSONValue.m from [a9f012805c] to [9ab88e7a0f].

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#import "OFNull.h"

#import "OFInvalidJSONException.h"

int _OFString_JSONValue_reference;

static id nextObject(const char **pointer, const char *stop, size_t *line,
    size_t depth, size_t depthLimit);

static void
skipWhitespaces(const char **pointer, const char *stop, size_t *line)
{
	while (*pointer < stop && (**pointer == ' ' || **pointer == '\t' ||
	    **pointer == '\r' || **pointer == '\n')) {
		if (**pointer == '\n')








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#import "OFNull.h"

#import "OFInvalidJSONException.h"

int _OFString_JSONValue_reference;

static id nextObject(const char **pointer, const char *stop, size_t *line,
    size_t depthLimit);

static void
skipWhitespaces(const char **pointer, const char *stop, size_t *line)
{
	while (*pointer < stop && (**pointer == ' ' || **pointer == '\t' ||
	    **pointer == '\r' || **pointer == '\n')) {
		if (**pointer == '\n')
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	 * reach stop.
	 */
	return nil;
}

static inline OFMutableArray *
parseArray(const char **pointer, const char *stop, size_t *line,
    size_t depth, size_t depthLimit)
{
	OFMutableArray *array = [OFMutableArray array];

	if (++(*pointer) >= stop)
		return nil;

	if (++depth > depthLimit)
		return nil;

	while (**pointer != ']') {
		id object;

		skipWhitespacesAndComments(pointer, stop, line);
		if (*pointer >= stop)








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	 * reach stop.
	 */
	return nil;
}

static inline OFMutableArray *
parseArray(const char **pointer, const char *stop, size_t *line,
    size_t depthLimit)
{
	OFMutableArray *array = [OFMutableArray array];

	if (++(*pointer) >= stop)
		return nil;

	if (--depthLimit == 0)
		return nil;

	while (**pointer != ']') {
		id object;

		skipWhitespacesAndComments(pointer, stop, line);
		if (*pointer >= stop)
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			if (*pointer >= stop || **pointer != ']')
				return nil;

			break;
		}

		object = nextObject(pointer, stop, line, depth, depthLimit);
		if (object == nil)
			return nil;

		[array addObject: object];

		skipWhitespacesAndComments(pointer, stop, line);
		if (*pointer >= stop)








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			if (*pointer >= stop || **pointer != ']')
				return nil;

			break;
		}

		object = nextObject(pointer, stop, line, depthLimit);
		if (object == nil)
			return nil;

		[array addObject: object];

		skipWhitespacesAndComments(pointer, stop, line);
		if (*pointer >= stop)
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	(*pointer)++;

	return array;
}

static inline OFMutableDictionary *
parseDictionary(const char **pointer, const char *stop, size_t *line,
    size_t depth, size_t depthLimit)
{
	OFMutableDictionary *dictionary = [OFMutableDictionary dictionary];

	if (++(*pointer) >= stop)
		return nil;

	if (++depth > depthLimit)
		return nil;

	while (**pointer != '}') {
		id key, object;

		skipWhitespacesAndComments(pointer, stop, line);
		if (*pointer >= stop)








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	(*pointer)++;

	return array;
}

static inline OFMutableDictionary *
parseDictionary(const char **pointer, const char *stop, size_t *line,
    size_t depthLimit)
{
	OFMutableDictionary *dictionary = [OFMutableDictionary dictionary];

	if (++(*pointer) >= stop)
		return nil;

	if (--depthLimit == 0)
		return nil;

	while (**pointer != '}') {
		id key, object;

		skipWhitespacesAndComments(pointer, stop, line);
		if (*pointer >= stop)
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			return nil;

		if ((**pointer >= 'a' && **pointer <= 'z') ||
		    (**pointer >= 'A' && **pointer <= 'Z') ||
		    **pointer == '_' || **pointer == '$' || **pointer == '\\')
			key = parseIdentifier(pointer, stop);
		else
			key = nextObject(pointer, stop, line,
			    depth, depthLimit);

		if (key == nil)
			return nil;

		skipWhitespacesAndComments(pointer, stop, line);
		if (*pointer + 1 >= stop || **pointer != ':')
			return nil;

		(*pointer)++;

		object = nextObject(pointer, stop, line, depth, depthLimit);
		if (object == nil)
			return nil;

		[dictionary setObject: object
			       forKey: key];

		skipWhitespacesAndComments(pointer, stop, line);








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			return nil;

		if ((**pointer >= 'a' && **pointer <= 'z') ||
		    (**pointer >= 'A' && **pointer <= 'Z') ||
		    **pointer == '_' || **pointer == '$' || **pointer == '\\')
			key = parseIdentifier(pointer, stop);
		else
			key = nextObject(pointer, stop, line, depthLimit);


		if (key == nil)
			return nil;

		skipWhitespacesAndComments(pointer, stop, line);
		if (*pointer + 1 >= stop || **pointer != ':')
			return nil;

		(*pointer)++;

		object = nextObject(pointer, stop, line, depthLimit);
		if (object == nil)
			return nil;

		[dictionary setObject: object
			       forKey: key];

		skipWhitespacesAndComments(pointer, stop, line);
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	}

	return number;
}

static id
nextObject(const char **pointer, const char *stop, size_t *line,
    size_t depth, size_t depthLimit)
{
	skipWhitespacesAndComments(pointer, stop, line);

	if (*pointer >= stop)
		return nil;

	switch (**pointer) {
	case '"':
	case '\'':
		return parseString(pointer, stop, line);
	case '[':
		return parseArray(pointer, stop, line, depth, depthLimit);
	case '{':
		return parseDictionary(pointer, stop, line, depth, depthLimit);
	case 't':
		if (*pointer + 3 >= stop)
			return nil;

		if (memcmp(*pointer, "true", 4) != 0)
			return nil;









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	}

	return number;
}

static id
nextObject(const char **pointer, const char *stop, size_t *line,
    size_t depthLimit)
{
	skipWhitespacesAndComments(pointer, stop, line);

	if (*pointer >= stop)
		return nil;

	switch (**pointer) {
	case '"':
	case '\'':
		return parseString(pointer, stop, line);
	case '[':
		return parseArray(pointer, stop, line, depthLimit);
	case '{':
		return parseDictionary(pointer, stop, line, depthLimit);
	case 't':
		if (*pointer + 3 >= stop)
			return nil;

		if (memcmp(*pointer, "true", 4) != 0)
			return nil;
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{
	void *pool = objc_autoreleasePoolPush();
	const char *pointer = [self UTF8String];
	const char *stop = pointer + [self UTF8StringLength];
	id object;
	size_t line = 1;

	object = nextObject(&pointer, stop, &line, 0, depthLimit);
	skipWhitespacesAndComments(&pointer, stop, &line);

	if (pointer < stop || object == nil)
		@throw [OFInvalidJSONException exceptionWithString: self
							      line: line];

	[object retain];

	objc_autoreleasePoolPop(pool);

	return [object autorelease];
}
@end








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{
	void *pool = objc_autoreleasePoolPush();
	const char *pointer = [self UTF8String];
	const char *stop = pointer + [self UTF8StringLength];
	id object;
	size_t line = 1;

	object = nextObject(&pointer, stop, &line, depthLimit);
	skipWhitespacesAndComments(&pointer, stop, &line);

	if (pointer < stop || object == nil)
		@throw [OFInvalidJSONException exceptionWithString: self
							      line: line];

	[object retain];

	objc_autoreleasePoolPop(pool);

	return [object autorelease];
}
@end

Modified tests/OFJSONTests.m from [0d2731c6ad] to [e1f8244382].

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	    [@"{" JSONValue])
	EXPECT_EXCEPTION(@"-[JSONValue] #3", OFInvalidJSONException,
	    [@"]" JSONValue])
	EXPECT_EXCEPTION(@"-[JSONValue] #4", OFInvalidJSONException,
	    [@"bar" JSONValue])
	EXPECT_EXCEPTION(@"-[JSONValue] #5", OFInvalidJSONException,
	    [@"[\"a\" \"b\"]" JSONValue])

























	[pool drain];
}
@end








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	    [@"{" JSONValue])
	EXPECT_EXCEPTION(@"-[JSONValue] #3", OFInvalidJSONException,
	    [@"]" JSONValue])
	EXPECT_EXCEPTION(@"-[JSONValue] #4", OFInvalidJSONException,
	    [@"bar" JSONValue])
	EXPECT_EXCEPTION(@"-[JSONValue] #5", OFInvalidJSONException,
	    [@"[\"a\" \"b\"]" JSONValue])

	TEST(@"-[JSONValue] #6",
	    [[@"[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{}]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]"
	    JSONValue] isEqual: [OFArray arrayWithObject:
	    [OFArray arrayWithObject: [OFArray arrayWithObject:
	    [OFArray arrayWithObject: [OFArray arrayWithObject:
	    [OFArray arrayWithObject: [OFArray arrayWithObject:
	    [OFArray arrayWithObject: [OFArray arrayWithObject:
	    [OFArray arrayWithObject: [OFArray arrayWithObject:
	    [OFArray arrayWithObject: [OFArray arrayWithObject:
	    [OFArray arrayWithObject: [OFArray arrayWithObject:
	    [OFArray arrayWithObject: [OFArray arrayWithObject:
	    [OFArray arrayWithObject: [OFArray arrayWithObject:
	    [OFArray arrayWithObject: [OFArray arrayWithObject:
	    [OFArray arrayWithObject: [OFArray arrayWithObject:
	    [OFArray arrayWithObject: [OFArray arrayWithObject:
	    [OFArray arrayWithObject: [OFArray arrayWithObject:
	    [OFArray arrayWithObject: [OFArray arrayWithObject:
	    [OFArray arrayWithObject:
	    [OFDictionary dictionary]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]])

	EXPECT_EXCEPTION(@"-[JSONValue] #7", OFInvalidJSONException,
	    [@"[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[{}]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]"
	    JSONValue])

	[pool drain];
}
@end

Fossil 2.23 [47362306a7] 2023-11-01 18:56:47
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