GODRIVER-3260 [master] Code hardening

bson/default_value_decoders.go

@@ -292,7 +292,7 @@ func intDecodeType(dc DecodeContext, vr ValueReader, t reflect.Type) (reflect.Va
 	case reflect.Int64:
 		return reflect.ValueOf(i64), nil
 	case reflect.Int:
-		if int64(int(i64)) != i64 { // Can we fit this inside of an int
+		if i64 > math.MaxInt { // Can we fit this inside of an int
 			return emptyValue, fmt.Errorf("%d overflows int", i64)
 		}
 

bson/extjson_wrappers.go

@@ -92,9 +92,9 @@ func (ejv *extJSONValue) parseBinary() (b []byte, subType byte, err error) {
 				return nil, 0, fmt.Errorf("$binary subType value should be string, but instead is %s", val.t)
 			}
 
-			i, err := strconv.ParseInt(val.v.(string), 16, 64)
+			i, err := strconv.ParseUint(val.v.(string), 16, 8)
 			if err != nil {
-				return nil, 0, fmt.Errorf("invalid $binary subType string: %s", val.v.(string))
+				return nil, 0, fmt.Errorf("invalid $binary subType string: %q: %w", val.v.(string), err)
 			}
 
 			subType = byte(i)

bson/uint_codec.go

@@ -123,11 +123,15 @@ func (uic *uintCodec) decodeType(dc DecodeContext, vr ValueReader, t reflect.Typ
 
 		return reflect.ValueOf(uint64(i64)), nil
 	case reflect.Uint:
-		if i64 < 0 || int64(uint(i64)) != i64 { // Can we fit this inside of an uint
+		if i64 < 0 {
+			return emptyValue, fmt.Errorf("%d overflows uint", i64)
+		}
+		v := uint64(i64)
+		if v > math.MaxUint { // Can we fit this inside of an uint
 			return emptyValue, fmt.Errorf("%d overflows uint", i64)
 		}
 
-		return reflect.ValueOf(uint(i64)), nil
+		return reflect.ValueOf(uint(v)), nil
 	default:
 		return emptyValue, ValueDecoderError{
 			Name:     "UintDecodeValue",

bson/value_reader.go

@@ -839,7 +839,7 @@ func (vr *valueReader) peekLength() (int32, error) {
 	}
 
 	idx := vr.offset
-	return (int32(vr.d[idx]) | int32(vr.d[idx+1])<<8 | int32(vr.d[idx+2])<<16 | int32(vr.d[idx+3])<<24), nil
+	return int32(binary.LittleEndian.Uint32(vr.d[idx:])), nil
 }
 
 func (vr *valueReader) readLength() (int32, error) { return vr.readi32() }
@@ -851,7 +851,7 @@ func (vr *valueReader) readi32() (int32, error) {
 
 	idx := vr.offset
 	vr.offset += 4
-	return (int32(vr.d[idx]) | int32(vr.d[idx+1])<<8 | int32(vr.d[idx+2])<<16 | int32(vr.d[idx+3])<<24), nil
+	return int32(binary.LittleEndian.Uint32(vr.d[idx:])), nil
 }
 
 func (vr *valueReader) readu32() (uint32, error) {
@@ -861,7 +861,7 @@ func (vr *valueReader) readu32() (uint32, error) {
 
 	idx := vr.offset
 	vr.offset += 4
-	return (uint32(vr.d[idx]) | uint32(vr.d[idx+1])<<8 | uint32(vr.d[idx+2])<<16 | uint32(vr.d[idx+3])<<24), nil
+	return binary.LittleEndian.Uint32(vr.d[idx:]), nil
 }
 
 func (vr *valueReader) readi64() (int64, error) {
@@ -871,8 +871,7 @@ func (vr *valueReader) readi64() (int64, error) {
 
 	idx := vr.offset
 	vr.offset += 8
-	return int64(vr.d[idx]) | int64(vr.d[idx+1])<<8 | int64(vr.d[idx+2])<<16 | int64(vr.d[idx+3])<<24 |
-		int64(vr.d[idx+4])<<32 | int64(vr.d[idx+5])<<40 | int64(vr.d[idx+6])<<48 | int64(vr.d[idx+7])<<56, nil
+	return int64(binary.LittleEndian.Uint64(vr.d[idx:])), nil
 }
 
 func (vr *valueReader) readu64() (uint64, error) {
@@ -882,6 +881,5 @@ func (vr *valueReader) readu64() (uint64, error) {
 
 	idx := vr.offset
 	vr.offset += 8
-	return uint64(vr.d[idx]) | uint64(vr.d[idx+1])<<8 | uint64(vr.d[idx+2])<<16 | uint64(vr.d[idx+3])<<24 |
-		uint64(vr.d[idx+4])<<32 | uint64(vr.d[idx+5])<<40 | uint64(vr.d[idx+6])<<48 | uint64(vr.d[idx+7])<<56, nil
+	return binary.LittleEndian.Uint64(vr.d[idx:]), nil
 }

etc/run-atlas-test.sh

@@ -7,5 +7,5 @@ set +x
 # Get the atlas secrets.
 . ${DRIVERS_TOOLS}/.evergreen/secrets_handling/setup-secrets.sh drivers/atlas_connect
 
-echo "Running cmd/testatlas/main.go"
-go run ./internal/cmd/testatlas/main.go "$ATLAS_REPL" "$ATLAS_SHRD" "$ATLAS_FREE" "$ATLAS_TLS11" "$ATLAS_TLS12" "$ATLAS_SERVERLESS" "$ATLAS_SRV_REPL" "$ATLAS_SRV_SHRD" "$ATLAS_SRV_FREE" "$ATLAS_SRV_TLS11" "$ATLAS_SRV_TLS12" "$ATLAS_SRV_SERVERLESS" >> test.suite
+echo "Running cmd/testatlas"
+go test -v -run ^TestAtlas$ go.mongodb.org/mongo-driver/internal/cmd/testatlas -args "$ATLAS_REPL" "$ATLAS_SHRD" "$ATLAS_FREE" "$ATLAS_TLS11" "$ATLAS_TLS12" "$ATLAS_SERVERLESS" "$ATLAS_SRV_REPL" "$ATLAS_SRV_SHRD" "$ATLAS_SRV_FREE" "$ATLAS_SRV_TLS11" "$ATLAS_SRV_TLS12" "$ATLAS_SRV_SERVERLESS" >> test.suite

internal/cmd/testatlas/main.go → internal/cmd/testatlas/atlas_test.go

@@ -11,6 +11,8 @@ import (
 	"errors"
 	"flag"
 	"fmt"
+	"os"
+	"testing"
 	"time"
 
 	"go.mongodb.org/mongo-driver/bson"
@@ -19,15 +21,19 @@ import (
 	"go.mongodb.org/mongo-driver/mongo/options"
 )
 
-func main() {
+func TestMain(m *testing.M) {
 	flag.Parse()
+	os.Exit(m.Run())
+}
+
+func TestAtlas(t *testing.T) {
 	uris := flag.Args()
 	ctx := context.Background()
 
-	fmt.Printf("Running atlas tests for %d uris\n", len(uris))
+	t.Logf("Running atlas tests for %d uris\n", len(uris))
 
 	for idx, uri := range uris {
-		fmt.Printf("Running test %d\n", idx)
+		t.Logf("Running test %d\n", idx)
 
 		// Set a low server selection timeout so we fail fast if there are errors.
 		clientOpts := options.Client().
@@ -36,18 +42,18 @@ func main() {
 
 		// Run basic connectivity test.
 		if err := runTest(ctx, clientOpts); err != nil {
-			panic(fmt.Sprintf("error running test with TLS at index %d: %v", idx, err))
+			t.Fatalf("error running test with TLS at index %d: %v", idx, err)
 		}
 
 		// Run the connectivity test with InsecureSkipVerify to ensure SNI is done correctly even if verification is
 		// disabled.
 		clientOpts.TLSConfig.InsecureSkipVerify = true
 		if err := runTest(ctx, clientOpts); err != nil {
-			panic(fmt.Sprintf("error running test with tlsInsecure at index %d: %v", idx, err))
+			t.Fatalf("error running test with tlsInsecure at index %d: %v", idx, err)
 		}
 	}
 
-	fmt.Println("Finished!")
+	t.Logf("Finished!")
 }
 
 func runTest(ctx context.Context, clientOpts *options.ClientOptions) error {

internal/logger/io_sink.go

@@ -9,6 +9,7 @@ package logger
 import (
 	"encoding/json"
 	"io"
+	"math"
 	"sync"
 	"time"
 )
@@ -36,7 +37,11 @@ func NewIOSink(out io.Writer) *IOSink {
 
 // Info will write a JSON-encoded message to the io.Writer.
 func (sink *IOSink) Info(_ int, msg string, keysAndValues ...interface{}) {
-	kvMap := make(map[string]interface{}, len(keysAndValues)/2+2)
+	mapSize := len(keysAndValues) / 2
+	if math.MaxInt-mapSize >= 2 {
+		mapSize += 2
+	}
+	kvMap := make(map[string]interface{}, mapSize)
 
 	kvMap[KeyTimestamp] = time.Now().UnixNano()
 	kvMap[KeyMessage] = msg

mongo/options/clientoptions.go

@@ -15,6 +15,7 @@ import (
 	"errors"
 	"fmt"
 	"io/ioutil"
+	"math"
 	"net"
 	"net/http"
 	"strings"
@@ -1142,7 +1143,19 @@ func addClientCertFromSeparateFiles(cfg *tls.Config, keyFile, certFile, keyPassw
 		return "", err
 	}
 
-	data := make([]byte, 0, len(keyData)+len(certData)+1)
+	keySize := len(keyData)
+	if keySize > 64*1024*1024 {
+		return "", errors.New("X.509 key must be less than 64 MiB")
+	}
+	certSize := len(certData)
+	if certSize > 64*1024*1024 {
+		return "", errors.New("X.509 certificate must be less than 64 MiB")
+	}
+	dataSize := int64(keySize) + int64(certSize) + 1
+	if dataSize > math.MaxInt {
+		return "", errors.New("size overflow")
+	}
+	data := make([]byte, 0, int(dataSize))
 	data = append(data, keyData...)
 	data = append(data, '\n')
 	data = append(data, certData...)

mongo/writeconcern/writeconcern.go

@@ -13,6 +13,7 @@ package writeconcern
 import (
 	"errors"
 	"fmt"
+	"math"
 
 	"go.mongodb.org/mongo-driver/bson"
 	"go.mongodb.org/mongo-driver/x/bsonx/bsoncore"
@@ -157,6 +158,9 @@ func (wc *WriteConcern) MarshalBSONValue() (bson.Type, []byte, error) {
 				return 0, nil, ErrInconsistent
 			}
 
+			if w > math.MaxInt32 {
+				return 0, nil, fmt.Errorf("%d overflows int32", w)
+			}
 			elems = bsoncore.AppendInt32Element(elems, "w", int32(w))
 		case string:
 			elems = bsoncore.AppendStringElement(elems, "w", w)

x/bsonx/bsoncore/bsoncore.go

@@ -8,6 +8,7 @@ package bsoncore
 
 import (
 	"bytes"
+	"encoding/binary"
 	"fmt"
 	"math"
 	"strconv"
@@ -705,17 +706,16 @@ func ReserveLength(dst []byte) (int32, []byte) {
 
 // UpdateLength updates the length at index with length and returns the []byte.
 func UpdateLength(dst []byte, index, length int32) []byte {
-	dst[index] = byte(length)
-	dst[index+1] = byte(length >> 8)
-	dst[index+2] = byte(length >> 16)
-	dst[index+3] = byte(length >> 24)
+	binary.LittleEndian.PutUint32(dst[index:], uint32(length))
 	return dst
 }
 
 func appendLength(dst []byte, l int32) []byte { return appendi32(dst, l) }
 
 func appendi32(dst []byte, i32 int32) []byte {
-	return append(dst, byte(i32), byte(i32>>8), byte(i32>>16), byte(i32>>24))
+	b := []byte{0, 0, 0, 0}
+	binary.LittleEndian.PutUint32(b, uint32(i32))
+	return append(dst, b...)
 }
 
 // ReadLength reads an int32 length from src and returns the length and the remaining bytes. If
@@ -733,51 +733,47 @@ func readi32(src []byte) (int32, []byte, bool) {
 	if len(src) < 4 {
 		return 0, src, false
 	}
-	return (int32(src[0]) | int32(src[1])<<8 | int32(src[2])<<16 | int32(src[3])<<24), src[4:], true
+	return int32(binary.LittleEndian.Uint32(src)), src[4:], true
 }
 
 func appendi64(dst []byte, i64 int64) []byte {
-	return append(dst,
-		byte(i64), byte(i64>>8), byte(i64>>16), byte(i64>>24),
-		byte(i64>>32), byte(i64>>40), byte(i64>>48), byte(i64>>56),
-	)
+	b := []byte{0, 0, 0, 0, 0, 0, 0, 0}
+	binary.LittleEndian.PutUint64(b, uint64(i64))
+	return append(dst, b...)
 }
 
 func readi64(src []byte) (int64, []byte, bool) {
 	if len(src) < 8 {
 		return 0, src, false
 	}
-	i64 := (int64(src[0]) | int64(src[1])<<8 | int64(src[2])<<16 | int64(src[3])<<24 |
-		int64(src[4])<<32 | int64(src[5])<<40 | int64(src[6])<<48 | int64(src[7])<<56)
-	return i64, src[8:], true
+	return int64(binary.LittleEndian.Uint64(src)), src[8:], true
 }
 
 func appendu32(dst []byte, u32 uint32) []byte {
-	return append(dst, byte(u32), byte(u32>>8), byte(u32>>16), byte(u32>>24))
+	b := []byte{0, 0, 0, 0}
+	binary.LittleEndian.PutUint32(b, u32)
+	return append(dst, b...)
 }
 
 func readu32(src []byte) (uint32, []byte, bool) {
 	if len(src) < 4 {
 		return 0, src, false
 	}
 
-	return (uint32(src[0]) | uint32(src[1])<<8 | uint32(src[2])<<16 | uint32(src[3])<<24), src[4:], true
+	return binary.LittleEndian.Uint32(src), src[4:], true
 }
 
 func appendu64(dst []byte, u64 uint64) []byte {
-	return append(dst,
-		byte(u64), byte(u64>>8), byte(u64>>16), byte(u64>>24),
-		byte(u64>>32), byte(u64>>40), byte(u64>>48), byte(u64>>56),
-	)
+	b := []byte{0, 0, 0, 0, 0, 0, 0, 0}
+	binary.LittleEndian.PutUint64(b, u64)
+	return append(dst, b...)
 }
 
 func readu64(src []byte) (uint64, []byte, bool) {
 	if len(src) < 8 {
 		return 0, src, false
 	}
-	u64 := (uint64(src[0]) | uint64(src[1])<<8 | uint64(src[2])<<16 | uint64(src[3])<<24 |
-		uint64(src[4])<<32 | uint64(src[5])<<40 | uint64(src[6])<<48 | uint64(src[7])<<56)
-	return u64, src[8:], true
+	return binary.LittleEndian.Uint64(src), src[8:], true
 }
 
 // keep in sync with readcstringbytes