go.mod: update golang.org/x dependencies

Update golang.org/x dependencies to their latest tagged versions.

Change-Id: I54256afe881714f60fc37c471cd65b060090d9d6
Reviewed-on: https://go-review.googlesource.com/c/crypto/+/568816
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Gopher Robot <gobot@golang.org>

argon2/blamka_amd64.s

@@ -199,8 +199,8 @@ TEXT ·mixBlocksSSE2(SB), 4, $0-32
 	MOVQ out+0(FP), DX
 	MOVQ a+8(FP), AX
 	MOVQ b+16(FP), BX
-	MOVQ a+24(FP), CX
-	MOVQ $128, BP
+	MOVQ c+24(FP), CX
+	MOVQ $128, DI
 
 loop:
 	MOVOU 0(AX), X0
@@ -213,7 +213,7 @@ loop:
 	ADDQ  $16, BX
 	ADDQ  $16, CX
 	ADDQ  $16, DX
-	SUBQ  $2, BP
+	SUBQ  $2, DI
 	JA    loop
 	RET
 
@@ -222,8 +222,8 @@ TEXT ·xorBlocksSSE2(SB), 4, $0-32
 	MOVQ out+0(FP), DX
 	MOVQ a+8(FP), AX
 	MOVQ b+16(FP), BX
-	MOVQ a+24(FP), CX
-	MOVQ $128, BP
+	MOVQ c+24(FP), CX
+	MOVQ $128, DI
 
 loop:
 	MOVOU 0(AX), X0
@@ -238,6 +238,6 @@ loop:
 	ADDQ  $16, BX
 	ADDQ  $16, CX
 	ADDQ  $16, DX
-	SUBQ  $2, BP
+	SUBQ  $2, DI
 	JA    loop
 	RET

blake2b/blake2bAVX2_amd64.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build go1.7 && amd64 && gc && !purego
+//go:build amd64 && gc && !purego
 
 package blake2b
 

blake2b/blake2bAVX2_amd64.s

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build go1.7 && amd64 && gc && !purego
+//go:build amd64 && gc && !purego
 
 #include "textflag.h"
 

blake2b/blake2b_amd64.go

@@ -1,24 +0,0 @@
-// Copyright 2016 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-//go:build !go1.7 && amd64 && gc && !purego
-
-package blake2b
-
-import "golang.org/x/sys/cpu"
-
-func init() {
-	useSSE4 = cpu.X86.HasSSE41
-}
-
-//go:noescape
-func hashBlocksSSE4(h *[8]uint64, c *[2]uint64, flag uint64, blocks []byte)
-
-func hashBlocks(h *[8]uint64, c *[2]uint64, flag uint64, blocks []byte) {
-	if useSSE4 {
-		hashBlocksSSE4(h, c, flag, blocks)
-	} else {
-		hashBlocksGeneric(h, c, flag, blocks)
-	}
-}

blake2b/register.go

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build go1.9
-
 package blake2b
 
 import (

go.mod

@@ -3,9 +3,9 @@ module golang.org/x/crypto
 go 1.18
 
 require (
-	golang.org/x/net v0.10.0 // tagx:ignore
-	golang.org/x/sys v0.15.0
-	golang.org/x/term v0.15.0
+	golang.org/x/net v0.21.0 // tagx:ignore
+	golang.org/x/sys v0.18.0
+	golang.org/x/term v0.18.0
 )
 
 require golang.org/x/text v0.14.0 // indirect

go.sum

@@ -1,8 +1,8 @@
-golang.org/x/net v0.10.0 h1:X2//UzNDwYmtCLn7To6G58Wr6f5ahEAQgKNzv9Y951M=
-golang.org/x/net v0.10.0/go.mod h1:0qNGK6F8kojg2nk9dLZ2mShWaEBan6FAoqfSigmmuDg=
-golang.org/x/sys v0.15.0 h1:h48lPFYpsTvQJZF4EKyI4aLHaev3CxivZmv7yZig9pc=
-golang.org/x/sys v0.15.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
-golang.org/x/term v0.15.0 h1:y/Oo/a/q3IXu26lQgl04j/gjuBDOBlx7X6Om1j2CPW4=
-golang.org/x/term v0.15.0/go.mod h1:BDl952bC7+uMoWR75FIrCDx79TPU9oHkTZ9yRbYOrX0=
+golang.org/x/net v0.21.0 h1:AQyQV4dYCvJ7vGmJyKki9+PBdyvhkSd8EIx/qb0AYv4=
+golang.org/x/net v0.21.0/go.mod h1:bIjVDfnllIU7BJ2DNgfnXvpSvtn8VRwhlsaeUTyUS44=
+golang.org/x/sys v0.18.0 h1:DBdB3niSjOA/O0blCZBqDefyWNYveAYMNF1Wum0DYQ4=
+golang.org/x/sys v0.18.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/term v0.18.0 h1:FcHjZXDMxI8mM3nwhX9HlKop4C0YQvCVCdwYl2wOtE8=
+golang.org/x/term v0.18.0/go.mod h1:ILwASektA3OnRv7amZ1xhE/KTR+u50pbXfZ03+6Nx58=
 golang.org/x/text v0.14.0 h1:ScX5w1eTa3QqT8oi6+ziP7dTV1S2+ALU0bI+0zXKWiQ=
 golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=

internal/poly1305/bits_compat.go

@@ -1,39 +0,0 @@
-// Copyright 2019 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-//go:build !go1.13
-
-package poly1305
-
-// Generic fallbacks for the math/bits intrinsics, copied from
-// src/math/bits/bits.go. They were added in Go 1.12, but Add64 and Sum64 had
-// variable time fallbacks until Go 1.13.
-
-func bitsAdd64(x, y, carry uint64) (sum, carryOut uint64) {
-	sum = x + y + carry
-	carryOut = ((x & y) | ((x | y) &^ sum)) >> 63
-	return
-}
-
-func bitsSub64(x, y, borrow uint64) (diff, borrowOut uint64) {
-	diff = x - y - borrow
-	borrowOut = ((^x & y) | (^(x ^ y) & diff)) >> 63
-	return
-}
-
-func bitsMul64(x, y uint64) (hi, lo uint64) {
-	const mask32 = 1<<32 - 1
-	x0 := x & mask32
-	x1 := x >> 32
-	y0 := y & mask32
-	y1 := y >> 32
-	w0 := x0 * y0
-	t := x1*y0 + w0>>32
-	w1 := t & mask32
-	w2 := t >> 32
-	w1 += x0 * y1
-	hi = x1*y1 + w2 + w1>>32
-	lo = x * y
-	return
-}

internal/poly1305/bits_go1.13.go

@@ -1,21 +0,0 @@
-// Copyright 2019 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-//go:build go1.13
-
-package poly1305
-
-import "math/bits"
-
-func bitsAdd64(x, y, carry uint64) (sum, carryOut uint64) {
-	return bits.Add64(x, y, carry)
-}
-
-func bitsSub64(x, y, borrow uint64) (diff, borrowOut uint64) {
-	return bits.Sub64(x, y, borrow)
-}
-
-func bitsMul64(x, y uint64) (hi, lo uint64) {
-	return bits.Mul64(x, y)
-}

internal/poly1305/sum_generic.go

@@ -7,7 +7,10 @@
 
 package poly1305
 
-import "encoding/binary"
+import (
+	"encoding/binary"
+	"math/bits"
+)
 
 // Poly1305 [RFC 7539] is a relatively simple algorithm: the authentication tag
 // for a 64 bytes message is approximately
@@ -114,13 +117,13 @@ type uint128 struct {
 }
 
 func mul64(a, b uint64) uint128 {
-	hi, lo := bitsMul64(a, b)
+	hi, lo := bits.Mul64(a, b)
 	return uint128{lo, hi}
 }
 
 func add128(a, b uint128) uint128 {
-	lo, c := bitsAdd64(a.lo, b.lo, 0)
-	hi, c := bitsAdd64(a.hi, b.hi, c)
+	lo, c := bits.Add64(a.lo, b.lo, 0)
+	hi, c := bits.Add64(a.hi, b.hi, c)
 	if c != 0 {
 		panic("poly1305: unexpected overflow")
 	}
@@ -155,8 +158,8 @@ func updateGeneric(state *macState, msg []byte) {
 		// hide leading zeroes. For full chunks, that's 1 << 128, so we can just
 		// add 1 to the most significant (2¹²⁸) limb, h2.
 		if len(msg) >= TagSize {
-			h0, c = bitsAdd64(h0, binary.LittleEndian.Uint64(msg[0:8]), 0)
-			h1, c = bitsAdd64(h1, binary.LittleEndian.Uint64(msg[8:16]), c)
+			h0, c = bits.Add64(h0, binary.LittleEndian.Uint64(msg[0:8]), 0)
+			h1, c = bits.Add64(h1, binary.LittleEndian.Uint64(msg[8:16]), c)
 			h2 += c + 1
 
 			msg = msg[TagSize:]
@@ -165,8 +168,8 @@ func updateGeneric(state *macState, msg []byte) {
 			copy(buf[:], msg)
 			buf[len(msg)] = 1
 
-			h0, c = bitsAdd64(h0, binary.LittleEndian.Uint64(buf[0:8]), 0)
-			h1, c = bitsAdd64(h1, binary.LittleEndian.Uint64(buf[8:16]), c)
+			h0, c = bits.Add64(h0, binary.LittleEndian.Uint64(buf[0:8]), 0)
+			h1, c = bits.Add64(h1, binary.LittleEndian.Uint64(buf[8:16]), c)
 			h2 += c
 
 			msg = nil
@@ -219,9 +222,9 @@ func updateGeneric(state *macState, msg []byte) {
 		m3 := h2r1
 
 		t0 := m0.lo
-		t1, c := bitsAdd64(m1.lo, m0.hi, 0)
-		t2, c := bitsAdd64(m2.lo, m1.hi, c)
-		t3, _ := bitsAdd64(m3.lo, m2.hi, c)
+		t1, c := bits.Add64(m1.lo, m0.hi, 0)
+		t2, c := bits.Add64(m2.lo, m1.hi, c)
+		t3, _ := bits.Add64(m3.lo, m2.hi, c)
 
 		// Now we have the result as 4 64-bit limbs, and we need to reduce it
 		// modulo 2¹³⁰ - 5. The special shape of this Crandall prime lets us do
@@ -243,14 +246,14 @@ func updateGeneric(state *macState, msg []byte) {
 
 		// To add c * 5 to h, we first add cc = c * 4, and then add (cc >> 2) = c.
 
-		h0, c = bitsAdd64(h0, cc.lo, 0)
-		h1, c = bitsAdd64(h1, cc.hi, c)
+		h0, c = bits.Add64(h0, cc.lo, 0)
+		h1, c = bits.Add64(h1, cc.hi, c)
 		h2 += c
 
 		cc = shiftRightBy2(cc)
 
-		h0, c = bitsAdd64(h0, cc.lo, 0)
-		h1, c = bitsAdd64(h1, cc.hi, c)
+		h0, c = bits.Add64(h0, cc.lo, 0)
+		h1, c = bits.Add64(h1, cc.hi, c)
 		h2 += c
 
 		// h2 is at most 3 + 1 + 1 = 5, making the whole of h at most
@@ -287,9 +290,9 @@ func finalize(out *[TagSize]byte, h *[3]uint64, s *[2]uint64) {
 	// in constant time, we compute t = h - (2¹³⁰ - 5), and select h as the
 	// result if the subtraction underflows, and t otherwise.
 
-	hMinusP0, b := bitsSub64(h0, p0, 0)
-	hMinusP1, b := bitsSub64(h1, p1, b)
-	_, b = bitsSub64(h2, p2, b)
+	hMinusP0, b := bits.Sub64(h0, p0, 0)
+	hMinusP1, b := bits.Sub64(h1, p1, b)
+	_, b = bits.Sub64(h2, p2, b)
 
 	// h = h if h < p else h - p
 	h0 = select64(b, h0, hMinusP0)
@@ -301,8 +304,8 @@ func finalize(out *[TagSize]byte, h *[3]uint64, s *[2]uint64) {
 	//
 	// by just doing a wide addition with the 128 low bits of h and discarding
 	// the overflow.
-	h0, c := bitsAdd64(h0, s[0], 0)
-	h1, _ = bitsAdd64(h1, s[1], c)
+	h0, c := bits.Add64(h0, s[0], 0)
+	h1, _ = bits.Add64(h1, s[1], c)
 
 	binary.LittleEndian.PutUint64(out[0:8], h0)
 	binary.LittleEndian.PutUint64(out[8:16], h1)

internal/poly1305/sum_ppc64le.s

@@ -19,15 +19,14 @@
 
 #define POLY1305_MUL(h0, h1, h2, r0, r1, t0, t1, t2, t3, t4, t5) \
 	MULLD  r0, h0, t0;  \
-	MULLD  r0, h1, t4;  \
 	MULHDU r0, h0, t1;  \
+	MULLD  r0, h1, t4;  \
 	MULHDU r0, h1, t5;  \
 	ADDC   t4, t1, t1;  \
 	MULLD  r0, h2, t2;  \
-	ADDZE  t5;          \
 	MULHDU r1, h0, t4;  \
 	MULLD  r1, h0, h0;  \
-	ADD    t5, t2, t2;  \
+	ADDE   t5, t2, t2;  \
 	ADDC   h0, t1, t1;  \
 	MULLD  h2, r1, t3;  \
 	ADDZE  t4, h0;      \
@@ -37,13 +36,11 @@
 	ADDE   t5, t3, t3;  \
 	ADDC   h0, t2, t2;  \
 	MOVD   $-4, t4;     \
-	MOVD   t0, h0;      \
-	MOVD   t1, h1;      \
 	ADDZE  t3;          \
-	ANDCC  $3, t2, h2;  \
-	AND    t2, t4, t0;  \
+	RLDICL $0, t2, $62, h2; \
+	AND    t2, t4, h0;  \
 	ADDC   t0, h0, h0;  \
-	ADDE   t3, h1, h1;  \
+	ADDE   t3, t1, h1;  \
 	SLD    $62, t3, t4; \
 	SRD    $2, t2;      \
 	ADDZE  h2;          \
@@ -75,6 +72,7 @@ TEXT ·update(SB), $0-32
 loop:
 	POLY1305_ADD(R4, R8, R9, R10, R20, R21, R22)
 
+	PCALIGN $16
 multiply:
 	POLY1305_MUL(R8, R9, R10, R11, R12, R16, R17, R18, R14, R20, R21)
 	ADD $-16, R5

ocsp/ocsp.go

@@ -279,21 +279,22 @@ func getOIDFromHashAlgorithm(target crypto.Hash) asn1.ObjectIdentifier {
 
 // This is the exposed reflection of the internal OCSP structures.
 
-// The status values that can be expressed in OCSP.  See RFC 6960.
+// The status values that can be expressed in OCSP. See RFC 6960.
+// These are used for the Response.Status field.
 const (
 	// Good means that the certificate is valid.
-	Good = iota
+	Good = 0
 	// Revoked means that the certificate has been deliberately revoked.
-	Revoked
+	Revoked = 1
 	// Unknown means that the OCSP responder doesn't know about the certificate.
-	Unknown
+	Unknown = 2
 	// ServerFailed is unused and was never used (see
 	// https://go-review.googlesource.com/#/c/18944). ParseResponse will
 	// return a ResponseError when an error response is parsed.
-	ServerFailed
+	ServerFailed = 3
 )
 
-// The enumerated reasons for revoking a certificate.  See RFC 5280.
+// The enumerated reasons for revoking a certificate. See RFC 5280.
 const (
 	Unspecified          = 0
 	KeyCompromise        = 1

sha3/keccakf_amd64.s

@@ -319,9 +319,9 @@
 	MOVQ rDi, _si(oState); \
 	MOVQ rDo, _so(oState)  \
 
-// func keccakF1600(state *[25]uint64)
+// func keccakF1600(a *[25]uint64)
 TEXT ·keccakF1600(SB), 0, $200-8
-	MOVQ state+0(FP), rpState
+	MOVQ a+0(FP), rpState
 
 	// Convert the user state into an internal state
 	NOTQ _be(rpState)

ssh/agent/client_test.go

@@ -164,15 +164,23 @@ func testAgentInterface(t *testing.T, agent ExtendedAgent, key interface{}, cert
 	data := []byte("hello")
 	sig, err := agent.Sign(pubKey, data)
 	if err != nil {
-		t.Fatalf("Sign(%s): %v", pubKey.Type(), err)
-	}
-
-	if err := pubKey.Verify(data, sig); err != nil {
-		t.Fatalf("Verify(%s): %v", pubKey.Type(), err)
+		t.Logf("sign failed with key type %q", pubKey.Type())
+		// In integration tests ssh-dss and ssh-rsa (SHA1 signatures) may be
+		// disabled for security reasons, we check SHA-2 variants later.
+		if pubKey.Type() != ssh.KeyAlgoDSA && pubKey.Type() != ssh.KeyAlgoRSA && pubKey.Type() != ssh.CertAlgoRSAv01 {
+			t.Fatalf("Sign(%s): %v", pubKey.Type(), err)
+		}
+	} else {
+		if err := pubKey.Verify(data, sig); err != nil {
+			t.Logf("verify failed with key type %q", pubKey.Type())
+			if pubKey.Type() != ssh.KeyAlgoRSA {
+				t.Fatalf("Verify(%s): %v", pubKey.Type(), err)
+			}
+		}
 	}
 
 	// For tests on RSA keys, try signing with SHA-256 and SHA-512 flags
-	if pubKey.Type() == "ssh-rsa" {
+	if pubKey.Type() == ssh.KeyAlgoRSA {
 		sshFlagTest := func(flag SignatureFlags, expectedSigFormat string) {
 			sig, err = agent.SignWithFlags(pubKey, data, flag)
 			if err != nil {
@@ -185,7 +193,6 @@ func testAgentInterface(t *testing.T, agent ExtendedAgent, key interface{}, cert
 				t.Fatalf("Verify(%s): %v", pubKey.Type(), err)
 			}
 		}
-		sshFlagTest(0, ssh.KeyAlgoRSA)
 		sshFlagTest(SignatureFlagRsaSha256, ssh.KeyAlgoRSASHA256)
 		sshFlagTest(SignatureFlagRsaSha512, ssh.KeyAlgoRSASHA512)
 	}

ssh/channel.go

@@ -187,9 +187,11 @@ type channel struct {
 	pending    *buffer
 	extPending *buffer
 
-	// windowMu protects myWindow, the flow-control window.
-	windowMu sync.Mutex
-	myWindow uint32
+	// windowMu protects myWindow, the flow-control window, and myConsumed,
+	// the number of bytes consumed since we last increased myWindow
+	windowMu   sync.Mutex
+	myWindow   uint32
+	myConsumed uint32
 
 	// writeMu serializes calls to mux.conn.writePacket() and
 	// protects sentClose and packetPool. This mutex must be
@@ -332,14 +334,24 @@ func (ch *channel) handleData(packet []byte) error {
 	return nil
 }
 
-func (c *channel) adjustWindow(n uint32) error {
+func (c *channel) adjustWindow(adj uint32) error {
 	c.windowMu.Lock()
-	// Since myWindow is managed on our side, and can never exceed
-	// the initial window setting, we don't worry about overflow.
-	c.myWindow += uint32(n)
+	// Since myConsumed and myWindow are managed on our side, and can never
+	// exceed the initial window setting, we don't worry about overflow.
+	c.myConsumed += adj
+	var sendAdj uint32
+	if (channelWindowSize-c.myWindow > 3*c.maxIncomingPayload) ||
+		(c.myWindow < channelWindowSize/2) {
+		sendAdj = c.myConsumed
+		c.myConsumed = 0
+		c.myWindow += sendAdj
+	}
 	c.windowMu.Unlock()
+	if sendAdj == 0 {
+		return nil
+	}
 	return c.sendMessage(windowAdjustMsg{
-		AdditionalBytes: uint32(n),
+		AdditionalBytes: sendAdj,
 	})
 }
 

ssh/client.go

@@ -82,7 +82,7 @@ func NewClientConn(c net.Conn, addr string, config *ClientConfig) (Conn, <-chan
 
 	if err := conn.clientHandshake(addr, &fullConf); err != nil {
 		c.Close()
-		return nil, nil, nil, fmt.Errorf("ssh: handshake failed: %v", err)
+		return nil, nil, nil, fmt.Errorf("ssh: handshake failed: %w", err)
 	}
 	conn.mux = newMux(conn.transport)
 	return conn, conn.mux.incomingChannels, conn.mux.incomingRequests, nil

ssh/client_test.go

@@ -7,6 +7,9 @@ package ssh
 import (
 	"bytes"
 	"crypto/rand"
+	"errors"
+	"fmt"
+	"net"
 	"strings"
 	"testing"
 )
@@ -207,9 +210,12 @@ func TestBannerCallback(t *testing.T) {
 }
 
 func TestNewClientConn(t *testing.T) {
+	errHostKeyMismatch := errors.New("host key mismatch")
+
 	for _, tt := range []struct {
-		name string
-		user string
+		name                    string
+		user                    string
+		simulateHostKeyMismatch HostKeyCallback
 	}{
 		{
 			name: "good user field for ConnMetadata",
@@ -219,6 +225,13 @@ func TestNewClientConn(t *testing.T) {
 			name: "empty user field for ConnMetadata",
 			user: "",
 		},
+		{
+			name: "host key mismatch",
+			user: "testuser",
+			simulateHostKeyMismatch: func(hostname string, remote net.Addr, key PublicKey) error {
+				return fmt.Errorf("%w: %s", errHostKeyMismatch, bytes.TrimSpace(MarshalAuthorizedKey(key)))
+			},
+		},
 	} {
 		t.Run(tt.name, func(t *testing.T) {
 			c1, c2, err := netPipe()
@@ -243,8 +256,16 @@ func TestNewClientConn(t *testing.T) {
 				},
 				HostKeyCallback: InsecureIgnoreHostKey(),
 			}
+
+			if tt.simulateHostKeyMismatch != nil {
+				clientConf.HostKeyCallback = tt.simulateHostKeyMismatch
+			}
+
 			clientConn, _, _, err := NewClientConn(c2, "", clientConf)
 			if err != nil {
+				if tt.simulateHostKeyMismatch != nil && errors.Is(err, errHostKeyMismatch) {
+					return
+				}
 				t.Fatal(err)
 			}
 

ssh/handshake.go

@@ -35,6 +35,16 @@ type keyingTransport interface {
 	// direction will be effected if a msgNewKeys message is sent
 	// or received.
 	prepareKeyChange(*algorithms, *kexResult) error
+
+	// setStrictMode sets the strict KEX mode, notably triggering
+	// sequence number resets on sending or receiving msgNewKeys.
+	// If the sequence number is already > 1 when setStrictMode
+	// is called, an error is returned.
+	setStrictMode() error
+
+	// setInitialKEXDone indicates to the transport that the initial key exchange
+	// was completed
+	setInitialKEXDone()
 }
 
 // handshakeTransport implements rekeying on top of a keyingTransport
@@ -100,6 +110,10 @@ type handshakeTransport struct {
 
 	// The session ID or nil if first kex did not complete yet.
 	sessionID []byte
+
+	// strictMode indicates if the other side of the handshake indicated
+	// that we should be following the strict KEX protocol restrictions.
+	strictMode bool
 }
 
 type pendingKex struct {
@@ -209,7 +223,10 @@ func (t *handshakeTransport) readLoop() {
 			close(t.incoming)
 			break
 		}
-		if p[0] == msgIgnore || p[0] == msgDebug {
+		// If this is the first kex, and strict KEX mode is enabled,
+		// we don't ignore any messages, as they may be used to manipulate
+		// the packet sequence numbers.
+		if !(t.sessionID == nil && t.strictMode) && (p[0] == msgIgnore || p[0] == msgDebug) {
 			continue
 		}
 		t.incoming <- p
@@ -441,6 +458,11 @@ func (t *handshakeTransport) readOnePacket(first bool) ([]byte, error) {
 	return successPacket, nil
 }
 
+const (
+	kexStrictClient = "kex-strict-c-v00@openssh.com"
+	kexStrictServer = "kex-strict-s-v00@openssh.com"
+)
+
 // sendKexInit sends a key change message.
 func (t *handshakeTransport) sendKexInit() error {
 	t.mu.Lock()
@@ -454,7 +476,6 @@ func (t *handshakeTransport) sendKexInit() error {
 	}
 
 	msg := &kexInitMsg{
-		KexAlgos:                t.config.KeyExchanges,
 		CiphersClientServer:     t.config.Ciphers,
 		CiphersServerClient:     t.config.Ciphers,
 		MACsClientServer:        t.config.MACs,
@@ -464,6 +485,13 @@ func (t *handshakeTransport) sendKexInit() error {
 	}
 	io.ReadFull(rand.Reader, msg.Cookie[:])
 
+	// We mutate the KexAlgos slice, in order to add the kex-strict extension algorithm,
+	// and possibly to add the ext-info extension algorithm. Since the slice may be the
+	// user owned KeyExchanges, we create our own slice in order to avoid using user
+	// owned memory by mistake.
+	msg.KexAlgos = make([]string, 0, len(t.config.KeyExchanges)+2) // room for kex-strict and ext-info
+	msg.KexAlgos = append(msg.KexAlgos, t.config.KeyExchanges...)
+
 	isServer := len(t.hostKeys) > 0
 	if isServer {
 		for _, k := range t.hostKeys {
@@ -488,17 +516,24 @@ func (t *handshakeTransport) sendKexInit() error {
 				msg.ServerHostKeyAlgos = append(msg.ServerHostKeyAlgos, keyFormat)
 			}
 		}
+
+		if t.sessionID == nil {
+			msg.KexAlgos = append(msg.KexAlgos, kexStrictServer)
+		}
 	} else {
 		msg.ServerHostKeyAlgos = t.hostKeyAlgorithms
 
 		// As a client we opt in to receiving SSH_MSG_EXT_INFO so we know what
 		// algorithms the server supports for public key authentication. See RFC
 		// 8308, Section 2.1.
+		//
+		// We also send the strict KEX mode extension algorithm, in order to opt
+		// into the strict KEX mode.
 		if firstKeyExchange := t.sessionID == nil; firstKeyExchange {
-			msg.KexAlgos = make([]string, 0, len(t.config.KeyExchanges)+1)
-			msg.KexAlgos = append(msg.KexAlgos, t.config.KeyExchanges...)
 			msg.KexAlgos = append(msg.KexAlgos, "ext-info-c")
+			msg.KexAlgos = append(msg.KexAlgos, kexStrictClient)
 		}
+
 	}
 
 	packet := Marshal(msg)
@@ -604,6 +639,13 @@ func (t *handshakeTransport) enterKeyExchange(otherInitPacket []byte) error {
 		return err
 	}
 
+	if t.sessionID == nil && ((isClient && contains(serverInit.KexAlgos, kexStrictServer)) || (!isClient && contains(clientInit.KexAlgos, kexStrictClient))) {
+		t.strictMode = true
+		if err := t.conn.setStrictMode(); err != nil {
+			return err
+		}
+	}
+
 	// We don't send FirstKexFollows, but we handle receiving it.
 	//
 	// RFC 4253 section 7 defines the kex and the agreement method for
@@ -679,6 +721,12 @@ func (t *handshakeTransport) enterKeyExchange(otherInitPacket []byte) error {
 		return unexpectedMessageError(msgNewKeys, packet[0])
 	}
 
+	if firstKeyExchange {
+		// Indicates to the transport that the first key exchange is completed
+		// after receiving SSH_MSG_NEWKEYS.
+		t.conn.setInitialKEXDone()
+	}
+
 	return nil
 }
 

ssh/handshake_test.go

@@ -395,6 +395,10 @@ func (n *errorKeyingTransport) readPacket() ([]byte, error) {
 	return n.packetConn.readPacket()
 }
 
+func (n *errorKeyingTransport) setStrictMode() error { return nil }
+
+func (n *errorKeyingTransport) setInitialKEXDone() {}
+
 func TestHandshakeErrorHandlingRead(t *testing.T) {
 	for i := 0; i < 20; i++ {
 		testHandshakeErrorHandlingN(t, i, -1, false)
@@ -710,3 +714,308 @@ func TestPickIncompatibleHostKeyAlgo(t *testing.T) {
 		t.Fatal("incompatible signer returned")
 	}
 }
+
+func TestStrictKEXResetSeqFirstKEX(t *testing.T) {
+	if runtime.GOOS == "plan9" {
+		t.Skip("see golang.org/issue/7237")
+	}
+
+	checker := &syncChecker{
+		waitCall: make(chan int, 10),
+		called:   make(chan int, 10),
+	}
+
+	checker.waitCall <- 1
+	trC, trS, err := handshakePair(&ClientConfig{HostKeyCallback: checker.Check}, "addr", false)
+	if err != nil {
+		t.Fatalf("handshakePair: %v", err)
+	}
+	<-checker.called
+
+	t.Cleanup(func() {
+		trC.Close()
+		trS.Close()
+	})
+
+	// Throw away the msgExtInfo packet sent during the handshake by the server
+	_, err = trC.readPacket()
+	if err != nil {
+		t.Fatalf("readPacket failed: %s", err)
+	}
+
+	// close the handshake transports before checking the sequence number to
+	// avoid races.
+	trC.Close()
+	trS.Close()
+
+	// check that the sequence number counters. We reset after msgNewKeys, but
+	// then the server immediately writes msgExtInfo, and we close the
+	// transports so we expect read 2, write 0 on the client and read 1, write 1
+	// on the server.
+	if trC.conn.(*transport).reader.seqNum != 2 || trC.conn.(*transport).writer.seqNum != 0 ||
+		trS.conn.(*transport).reader.seqNum != 1 || trS.conn.(*transport).writer.seqNum != 1 {
+		t.Errorf(
+			"unexpected sequence counters:\nclient: reader %d (expected 2), writer %d (expected 0)\nserver: reader %d (expected 1), writer %d (expected 1)",
+			trC.conn.(*transport).reader.seqNum,
+			trC.conn.(*transport).writer.seqNum,
+			trS.conn.(*transport).reader.seqNum,
+			trS.conn.(*transport).writer.seqNum,
+		)
+	}
+}
+
+func TestStrictKEXResetSeqSuccessiveKEX(t *testing.T) {
+	if runtime.GOOS == "plan9" {
+		t.Skip("see golang.org/issue/7237")
+	}
+
+	checker := &syncChecker{
+		waitCall: make(chan int, 10),
+		called:   make(chan int, 10),
+	}
+
+	checker.waitCall <- 1
+	trC, trS, err := handshakePair(&ClientConfig{HostKeyCallback: checker.Check}, "addr", false)
+	if err != nil {
+		t.Fatalf("handshakePair: %v", err)
+	}
+	<-checker.called
+
+	t.Cleanup(func() {
+		trC.Close()
+		trS.Close()
+	})
+
+	// Throw away the msgExtInfo packet sent during the handshake by the server
+	_, err = trC.readPacket()
+	if err != nil {
+		t.Fatalf("readPacket failed: %s", err)
+	}
+
+	// write and read five packets on either side to bump the sequence numbers
+	for i := 0; i < 5; i++ {
+		if err := trC.writePacket([]byte{msgRequestSuccess}); err != nil {
+			t.Fatalf("writePacket failed: %s", err)
+		}
+		if _, err := trS.readPacket(); err != nil {
+			t.Fatalf("readPacket failed: %s", err)
+		}
+		if err := trS.writePacket([]byte{msgRequestSuccess}); err != nil {
+			t.Fatalf("writePacket failed: %s", err)
+		}
+		if _, err := trC.readPacket(); err != nil {
+			t.Fatalf("readPacket failed: %s", err)
+		}
+	}
+
+	// Request a key exchange, which should cause the sequence numbers to reset
+	checker.waitCall <- 1
+	trC.requestKeyExchange()
+	<-checker.called
+
+	// write a packet on the client, and then read it, to verify the key change has actually happened, since
+	// the HostKeyCallback is called _during_ the handshake, so isn't actually indicative of the handshake
+	// finishing.
+	dummyPacket := []byte{99}
+	if err := trS.writePacket(dummyPacket); err != nil {
+		t.Fatalf("writePacket failed: %s", err)
+	}
+	if p, err := trC.readPacket(); err != nil {
+		t.Fatalf("readPacket failed: %s", err)
+	} else if !bytes.Equal(p, dummyPacket) {
+		t.Fatalf("unexpected packet: got %x, want %x", p, dummyPacket)
+	}
+
+	// close the handshake transports before checking the sequence number to
+	// avoid races.
+	trC.Close()
+	trS.Close()
+
+	if trC.conn.(*transport).reader.seqNum != 2 || trC.conn.(*transport).writer.seqNum != 0 ||
+		trS.conn.(*transport).reader.seqNum != 1 || trS.conn.(*transport).writer.seqNum != 1 {
+		t.Errorf(
+			"unexpected sequence counters:\nclient: reader %d (expected 2), writer %d (expected 0)\nserver: reader %d (expected 1), writer %d (expected 1)",
+			trC.conn.(*transport).reader.seqNum,
+			trC.conn.(*transport).writer.seqNum,
+			trS.conn.(*transport).reader.seqNum,
+			trS.conn.(*transport).writer.seqNum,
+		)
+	}
+}
+
+func TestSeqNumIncrease(t *testing.T) {
+	if runtime.GOOS == "plan9" {
+		t.Skip("see golang.org/issue/7237")
+	}
+
+	checker := &syncChecker{
+		waitCall: make(chan int, 10),
+		called:   make(chan int, 10),
+	}
+
+	checker.waitCall <- 1
+	trC, trS, err := handshakePair(&ClientConfig{HostKeyCallback: checker.Check}, "addr", false)
+	if err != nil {
+		t.Fatalf("handshakePair: %v", err)
+	}
+	<-checker.called
+
+	t.Cleanup(func() {
+		trC.Close()
+		trS.Close()
+	})
+
+	// Throw away the msgExtInfo packet sent during the handshake by the server
+	_, err = trC.readPacket()
+	if err != nil {
+		t.Fatalf("readPacket failed: %s", err)
+	}
+
+	// write and read five packets on either side to bump the sequence numbers
+	for i := 0; i < 5; i++ {
+		if err := trC.writePacket([]byte{msgRequestSuccess}); err != nil {
+			t.Fatalf("writePacket failed: %s", err)
+		}
+		if _, err := trS.readPacket(); err != nil {
+			t.Fatalf("readPacket failed: %s", err)
+		}
+		if err := trS.writePacket([]byte{msgRequestSuccess}); err != nil {
+			t.Fatalf("writePacket failed: %s", err)
+		}
+		if _, err := trC.readPacket(); err != nil {
+			t.Fatalf("readPacket failed: %s", err)
+		}
+	}
+
+	// close the handshake transports before checking the sequence number to
+	// avoid races.
+	trC.Close()
+	trS.Close()
+
+	if trC.conn.(*transport).reader.seqNum != 7 || trC.conn.(*transport).writer.seqNum != 5 ||
+		trS.conn.(*transport).reader.seqNum != 6 || trS.conn.(*transport).writer.seqNum != 6 {
+		t.Errorf(
+			"unexpected sequence counters:\nclient: reader %d (expected 7), writer %d (expected 5)\nserver: reader %d (expected 6), writer %d (expected 6)",
+			trC.conn.(*transport).reader.seqNum,
+			trC.conn.(*transport).writer.seqNum,
+			trS.conn.(*transport).reader.seqNum,
+			trS.conn.(*transport).writer.seqNum,
+		)
+	}
+}
+
+func TestStrictKEXUnexpectedMsg(t *testing.T) {
+	if runtime.GOOS == "plan9" {
+		t.Skip("see golang.org/issue/7237")
+	}
+
+	// Check that unexpected messages during the handshake cause failure
+	_, _, err := handshakePair(&ClientConfig{HostKeyCallback: func(hostname string, remote net.Addr, key PublicKey) error { return nil }}, "addr", true)
+	if err == nil {
+		t.Fatal("handshake should fail when there are unexpected messages during the handshake")
+	}
+
+	trC, trS, err := handshakePair(&ClientConfig{HostKeyCallback: func(hostname string, remote net.Addr, key PublicKey) error { return nil }}, "addr", false)
+	if err != nil {
+		t.Fatalf("handshake failed: %s", err)
+	}
+
+	// Check that ignore/debug pacekts are still ignored outside of the handshake
+	if err := trC.writePacket([]byte{msgIgnore}); err != nil {
+		t.Fatalf("writePacket failed: %s", err)
+	}
+	if err := trC.writePacket([]byte{msgDebug}); err != nil {
+		t.Fatalf("writePacket failed: %s", err)
+	}
+	dummyPacket := []byte{99}
+	if err := trC.writePacket(dummyPacket); err != nil {
+		t.Fatalf("writePacket failed: %s", err)
+	}
+
+	if p, err := trS.readPacket(); err != nil {
+		t.Fatalf("readPacket failed: %s", err)
+	} else if !bytes.Equal(p, dummyPacket) {
+		t.Fatalf("unexpected packet: got %x, want %x", p, dummyPacket)
+	}
+}
+
+func TestStrictKEXMixed(t *testing.T) {
+	// Test that we still support a mixed connection, where one side sends kex-strict but the other
+	// side doesn't.
+
+	a, b, err := netPipe()
+	if err != nil {
+		t.Fatalf("netPipe failed: %s", err)
+	}
+
+	var trC, trS keyingTransport
+
+	trC = newTransport(a, rand.Reader, true)
+	trS = newTransport(b, rand.Reader, false)
+	trS = addNoiseTransport(trS)
+
+	clientConf := &ClientConfig{HostKeyCallback: func(hostname string, remote net.Addr, key PublicKey) error { return nil }}
+	clientConf.SetDefaults()
+
+	v := []byte("version")
+	client := newClientTransport(trC, v, v, clientConf, "addr", a.RemoteAddr())
+
+	serverConf := &ServerConfig{}
+	serverConf.AddHostKey(testSigners["ecdsa"])
+	serverConf.AddHostKey(testSigners["rsa"])
+	serverConf.SetDefaults()
+
+	transport := newHandshakeTransport(trS, &serverConf.Config, []byte("version"), []byte("version"))
+	transport.hostKeys = serverConf.hostKeys
+	transport.publicKeyAuthAlgorithms = serverConf.PublicKeyAuthAlgorithms
+
+	readOneFailure := make(chan error, 1)
+	go func() {
+		if _, err := transport.readOnePacket(true); err != nil {
+			readOneFailure <- err
+		}
+	}()
+
+	// Basically sendKexInit, but without the kex-strict extension algorithm
+	msg := &kexInitMsg{
+		KexAlgos:                transport.config.KeyExchanges,
+		CiphersClientServer:     transport.config.Ciphers,
+		CiphersServerClient:     transport.config.Ciphers,
+		MACsClientServer:        transport.config.MACs,
+		MACsServerClient:        transport.config.MACs,
+		CompressionClientServer: supportedCompressions,
+		CompressionServerClient: supportedCompressions,
+		ServerHostKeyAlgos:      []string{KeyAlgoRSASHA256, KeyAlgoRSASHA512, KeyAlgoRSA},
+	}
+	packet := Marshal(msg)
+	// writePacket destroys the contents, so save a copy.
+	packetCopy := make([]byte, len(packet))
+	copy(packetCopy, packet)
+	if err := transport.pushPacket(packetCopy); err != nil {
+		t.Fatalf("pushPacket: %s", err)
+	}
+	transport.sentInitMsg = msg
+	transport.sentInitPacket = packet
+
+	if err := transport.getWriteError(); err != nil {
+		t.Fatalf("getWriteError failed: %s", err)
+	}
+	var request *pendingKex
+	select {
+	case err = <-readOneFailure:
+		t.Fatalf("server readOnePacket failed: %s", err)
+	case request = <-transport.startKex:
+		break
+	}
+
+	// We expect the following calls to fail if the side which does not support
+	// kex-strict sends unexpected/ignored packets during the handshake, even if
+	// the other side does support kex-strict.
+
+	if err := transport.enterKeyExchange(request.otherInit); err != nil {
+		t.Fatalf("enterKeyExchange failed: %s", err)
+	}
+	if err := client.waitSession(); err != nil {
+		t.Fatalf("client.waitSession: %v", err)
+	}
+}

ssh/keys_test.go

@@ -610,7 +610,7 @@ func TestKnownHostsParsing(t *testing.T) {
 func TestFingerprintLegacyMD5(t *testing.T) {
 	pub, _ := getTestKey()
 	fingerprint := FingerprintLegacyMD5(pub)
-	want := "fb:61:6d:1a:e3:f0:95:45:3c:a0:79:be:4a:93:63:66" // ssh-keygen -lf -E md5 rsa
+	want := "b7:ef:d3:d5:89:29:52:96:9f:df:47:41:4d:15:37:f4" // ssh-keygen -lf -E md5 rsa
 	if fingerprint != want {
 		t.Errorf("got fingerprint %q want %q", fingerprint, want)
 	}
@@ -619,7 +619,7 @@ func TestFingerprintLegacyMD5(t *testing.T) {
 func TestFingerprintSHA256(t *testing.T) {
 	pub, _ := getTestKey()
 	fingerprint := FingerprintSHA256(pub)
-	want := "SHA256:Anr3LjZK8YVpjrxu79myrW9Hrb/wpcMNpVvTq/RcBm8" // ssh-keygen -lf rsa
+	want := "SHA256:fi5+D7UmDZDE9Q2sAVvvlpcQSIakN4DERdINgXd2AnE" // ssh-keygen -lf rsa
 	if fingerprint != want {
 		t.Errorf("got fingerprint %q want %q", fingerprint, want)
 	}

ssh/mempipe_test.go

@@ -13,9 +13,10 @@ import (
 // An in-memory packetConn. It is safe to call Close and writePacket
 // from different goroutines.
 type memTransport struct {
-	eof     bool
-	pending [][]byte
-	write   *memTransport
+	eof        bool
+	pending    [][]byte
+	write      *memTransport
+	writeCount uint64
 	sync.Mutex
 	*sync.Cond
 }
@@ -63,9 +64,16 @@ func (t *memTransport) writePacket(p []byte) error {
 	copy(c, p)
 	t.write.pending = append(t.write.pending, c)
 	t.write.Cond.Signal()
+	t.writeCount++
 	return nil
 }
 
+func (t *memTransport) getWriteCount() uint64 {
+	t.write.Lock()
+	defer t.write.Unlock()
+	return t.writeCount
+}
+
 func memPipe() (a, b packetConn) {
 	t1 := memTransport{}
 	t2 := memTransport{}
@@ -81,6 +89,9 @@ func TestMemPipe(t *testing.T) {
 	if err := a.writePacket([]byte{42}); err != nil {
 		t.Fatalf("writePacket: %v", err)
 	}
+	if wc := a.(*memTransport).getWriteCount(); wc != 1 {
+		t.Fatalf("got %v, want 1", wc)
+	}
 	if err := a.Close(); err != nil {
 		t.Fatal("Close: ", err)
 	}
@@ -95,6 +106,9 @@ func TestMemPipe(t *testing.T) {
 	if err != io.EOF {
 		t.Fatalf("got %v, %v, want EOF", p, err)
 	}
+	if wc := b.(*memTransport).getWriteCount(); wc != 0 {
+		t.Fatalf("got %v, want 0", wc)
+	}
 }
 
 func TestDoubleClose(t *testing.T) {

ssh/mux_test.go

@@ -182,6 +182,40 @@ func TestMuxChannelOverflow(t *testing.T) {
 	}
 }
 
+func TestMuxChannelReadUnblock(t *testing.T) {
+	reader, writer, mux := channelPair(t)
+	defer reader.Close()
+	defer writer.Close()
+	defer mux.Close()
+
+	var wg sync.WaitGroup
+	t.Cleanup(wg.Wait)
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		if _, err := writer.Write(make([]byte, channelWindowSize)); err != nil {
+			t.Errorf("could not fill window: %v", err)
+		}
+		if _, err := writer.Write(make([]byte, 1)); err != nil {
+			t.Errorf("Write: %v", err)
+		}
+		writer.Close()
+	}()
+
+	writer.remoteWin.waitWriterBlocked()
+
+	buf := make([]byte, 32768)
+	for {
+		_, err := reader.Read(buf)
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			t.Fatalf("Read: %v", err)
+		}
+	}
+}
+
 func TestMuxChannelCloseWriteUnblock(t *testing.T) {
 	reader, writer, mux := channelPair(t)
 	defer reader.Close()
@@ -754,6 +788,43 @@ func TestMuxMaxPacketSize(t *testing.T) {
 	}
 }
 
+func TestMuxChannelWindowDeferredUpdates(t *testing.T) {
+	s, c, mux := channelPair(t)
+	cTransport := mux.conn.(*memTransport)
+	defer s.Close()
+	defer c.Close()
+	defer mux.Close()
+
+	var wg sync.WaitGroup
+	t.Cleanup(wg.Wait)
+
+	data := make([]byte, 1024)
+
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		_, err := s.Write(data)
+		if err != nil {
+			t.Errorf("Write: %v", err)
+			return
+		}
+	}()
+	cWritesInit := cTransport.getWriteCount()
+	buf := make([]byte, 1)
+	for i := 0; i < len(data); i++ {
+		n, err := c.Read(buf)
+		if n != len(buf) || err != nil {
+			t.Fatalf("Read: %v, %v", n, err)
+		}
+	}
+	cWrites := cTransport.getWriteCount() - cWritesInit
+	// reading 1 KiB should not cause any window updates to be sent, but allow
+	// for some unexpected writes
+	if cWrites > 30 {
+		t.Fatalf("reading 1 KiB from channel caused %v writes", cWrites)
+	}
+}
+
 // Don't ship code with debug=true.
 func TestDebug(t *testing.T) {
 	if debugMux {

ssh/server.go

@@ -213,6 +213,7 @@ func NewServerConn(c net.Conn, config *ServerConfig) (*ServerConn, <-chan NewCha
 	} else {
 		for _, algo := range fullConf.PublicKeyAuthAlgorithms {
 			if !contains(supportedPubKeyAuthAlgos, algo) {
+				c.Close()
 				return nil, nil, nil, fmt.Errorf("ssh: unsupported public key authentication algorithm %s", algo)
 			}
 		}
@@ -220,6 +221,7 @@ func NewServerConn(c net.Conn, config *ServerConfig) (*ServerConn, <-chan NewCha
 	// Check if the config contains any unsupported key exchanges
 	for _, kex := range fullConf.KeyExchanges {
 		if _, ok := serverForbiddenKexAlgos[kex]; ok {
+			c.Close()
 			return nil, nil, nil, fmt.Errorf("ssh: unsupported key exchange %s for server", kex)
 		}
 	}

ssh/server_test.go

@@ -5,7 +5,11 @@
 package ssh
 
 import (
+	"io"
+	"net"
+	"sync/atomic"
 	"testing"
+	"time"
 )
 
 func TestClientAuthRestrictedPublicKeyAlgos(t *testing.T) {
@@ -59,27 +63,78 @@ func TestClientAuthRestrictedPublicKeyAlgos(t *testing.T) {
 }
 
 func TestNewServerConnValidationErrors(t *testing.T) {
-	c1, c2, err := netPipe()
-	if err != nil {
-		t.Fatalf("netPipe: %v", err)
-	}
-	defer c1.Close()
-	defer c2.Close()
-
 	serverConf := &ServerConfig{
 		PublicKeyAuthAlgorithms: []string{CertAlgoRSAv01},
 	}
-	_, _, _, err = NewServerConn(c1, serverConf)
+	c := &markerConn{}
+	_, _, _, err := NewServerConn(c, serverConf)
 	if err == nil {
 		t.Fatal("NewServerConn with invalid public key auth algorithms succeeded")
 	}
+	if !c.isClosed() {
+		t.Fatal("NewServerConn with invalid public key auth algorithms left connection open")
+	}
+	if c.isUsed() {
+		t.Fatal("NewServerConn with invalid public key auth algorithms used connection")
+	}
+
 	serverConf = &ServerConfig{
 		Config: Config{
 			KeyExchanges: []string{kexAlgoDHGEXSHA256},
 		},
 	}
-	_, _, _, err = NewServerConn(c1, serverConf)
+	c = &markerConn{}
+	_, _, _, err = NewServerConn(c, serverConf)
 	if err == nil {
 		t.Fatal("NewServerConn with unsupported key exchange succeeded")
 	}
+	if !c.isClosed() {
+		t.Fatal("NewServerConn with unsupported key exchange left connection open")
+	}
+	if c.isUsed() {
+		t.Fatal("NewServerConn with unsupported key exchange used connection")
+	}
 }
+
+type markerConn struct {
+	closed uint32
+	used   uint32
+}
+
+func (c *markerConn) isClosed() bool {
+	return atomic.LoadUint32(&c.closed) != 0
+}
+
+func (c *markerConn) isUsed() bool {
+	return atomic.LoadUint32(&c.used) != 0
+}
+
+func (c *markerConn) Close() error {
+	atomic.StoreUint32(&c.closed, 1)
+	return nil
+}
+
+func (c *markerConn) Read(b []byte) (n int, err error) {
+	atomic.StoreUint32(&c.used, 1)
+	if atomic.LoadUint32(&c.closed) != 0 {
+		return 0, net.ErrClosed
+	} else {
+		return 0, io.EOF
+	}
+}
+
+func (c *markerConn) Write(b []byte) (n int, err error) {
+	atomic.StoreUint32(&c.used, 1)
+	if atomic.LoadUint32(&c.closed) != 0 {
+		return 0, net.ErrClosed
+	} else {
+		return 0, io.ErrClosedPipe
+	}
+}
+
+func (*markerConn) LocalAddr() net.Addr  { return nil }
+func (*markerConn) RemoteAddr() net.Addr { return nil }
+
+func (*markerConn) SetDeadline(t time.Time) error      { return nil }
+func (*markerConn) SetReadDeadline(t time.Time) error  { return nil }
+func (*markerConn) SetWriteDeadline(t time.Time) error { return nil }

ssh/test/agent_unix_test.go

@@ -34,6 +34,7 @@ func TestAgentForward(t *testing.T) {
 
 	sess, err := conn.NewSession()
 	if err != nil {
+		skipIfIssue64959(t, err)
 		t.Fatalf("NewSession: %v", err)
 	}
 	if err := agent.RequestAgentForwarding(sess); err != nil {

ssh/test/cert_test.go

@@ -19,7 +19,7 @@ func TestCertLogin(t *testing.T) {
 	s := newServer(t)
 
 	// Use a key different from the default.
-	clientKey := testSigners["dsa"]
+	clientKey := testSigners["ed25519"]
 	caAuthKey := testSigners["ecdsa"]
 	cert := &ssh.Certificate{
 		Key:             clientKey.PublicKey(),

ssh/test/dial_unix_test.go

@@ -53,6 +53,7 @@ func testDial(t *testing.T, n, listenAddr string, x dialTester) {
 	// on the opened connection.
 	cancel()
 	if err != nil {
+		skipIfIssue64959(t, err)
 		t.Fatalf("Dial: %v", err)
 	}
 	x.TestClientConn(t, conn)

ssh/test/forward_unix_test.go

@@ -12,6 +12,7 @@ import (
 	"io"
 	"math/rand"
 	"net"
+	"runtime"
 	"testing"
 	"time"
 )
@@ -27,6 +28,9 @@ func testPortForward(t *testing.T, n, listenAddr string) {
 
 	sshListener, err := conn.Listen(n, listenAddr)
 	if err != nil {
+		if runtime.GOOS == "darwin" && err == io.EOF {
+			t.Skipf("skipping test broken on some versions of macOS; see https://go.dev/issue/64959")
+		}
 		t.Fatal(err)
 	}
 
@@ -122,6 +126,9 @@ func testAcceptClose(t *testing.T, n, listenAddr string) {
 
 	sshListener, err := conn.Listen(n, listenAddr)
 	if err != nil {
+		if runtime.GOOS == "darwin" && err == io.EOF {
+			t.Skipf("skipping test broken on some versions of macOS; see https://go.dev/issue/64959")
+		}
 		t.Fatal(err)
 	}
 
@@ -163,6 +170,9 @@ func testPortForwardConnectionClose(t *testing.T, n, listenAddr string) {
 
 	sshListener, err := client.Listen(n, listenAddr)
 	if err != nil {
+		if runtime.GOOS == "darwin" && err == io.EOF {
+			t.Skipf("skipping test broken on some versions of macOS; see https://go.dev/issue/64959")
+		}
 		t.Fatal(err)
 	}
 

ssh/test/session_test.go

@@ -22,6 +22,13 @@ import (
 	"golang.org/x/crypto/ssh"
 )
 
+func skipIfIssue64959(t *testing.T, err error) {
+	if err != nil && runtime.GOOS == "darwin" && strings.Contains(err.Error(), "ssh: unexpected packet in response to channel open: <nil>") {
+		t.Helper()
+		t.Skipf("skipping test broken on some versions of macOS; see https://go.dev/issue/64959")
+	}
+}
+
 func TestRunCommandSuccess(t *testing.T) {
 	server := newServer(t)
 	conn := server.Dial(clientConfig())
@@ -29,6 +36,7 @@ func TestRunCommandSuccess(t *testing.T) {
 
 	session, err := conn.NewSession()
 	if err != nil {
+		skipIfIssue64959(t, err)
 		t.Fatalf("session failed: %v", err)
 	}
 	defer session.Close()
@@ -66,6 +74,7 @@ func TestRunCommandStdin(t *testing.T) {
 
 	session, err := conn.NewSession()
 	if err != nil {
+		skipIfIssue64959(t, err)
 		t.Fatalf("session failed: %v", err)
 	}
 	defer session.Close()
@@ -88,6 +97,7 @@ func TestRunCommandStdinError(t *testing.T) {
 
 	session, err := conn.NewSession()
 	if err != nil {
+		skipIfIssue64959(t, err)
 		t.Fatalf("session failed: %v", err)
 	}
 	defer session.Close()
@@ -111,6 +121,7 @@ func TestRunCommandFailed(t *testing.T) {
 
 	session, err := conn.NewSession()
 	if err != nil {
+		skipIfIssue64959(t, err)
 		t.Fatalf("session failed: %v", err)
 	}
 	defer session.Close()
@@ -127,6 +138,7 @@ func TestRunCommandWeClosed(t *testing.T) {
 
 	session, err := conn.NewSession()
 	if err != nil {
+		skipIfIssue64959(t, err)
 		t.Fatalf("session failed: %v", err)
 	}
 	err = session.Shell()
@@ -146,6 +158,7 @@ func TestFuncLargeRead(t *testing.T) {
 
 	session, err := conn.NewSession()
 	if err != nil {
+		skipIfIssue64959(t, err)
 		t.Fatalf("unable to create new session: %s", err)
 	}
 
@@ -182,6 +195,7 @@ func TestKeyChange(t *testing.T) {
 	for i := 0; i < 4; i++ {
 		session, err := conn.NewSession()
 		if err != nil {
+			skipIfIssue64959(t, err)
 			t.Fatalf("unable to create new session: %s", err)
 		}
 
@@ -223,6 +237,7 @@ func TestValidTerminalMode(t *testing.T) {
 
 	session, err := conn.NewSession()
 	if err != nil {
+		skipIfIssue64959(t, err)
 		t.Fatalf("session failed: %v", err)
 	}
 	defer session.Close()
@@ -287,6 +302,7 @@ func TestWindowChange(t *testing.T) {
 
 	session, err := conn.NewSession()
 	if err != nil {
+		skipIfIssue64959(t, err)
 		t.Fatalf("session failed: %v", err)
 	}
 	defer session.Close()
@@ -341,14 +357,10 @@ func testOneCipher(t *testing.T, cipher string, cipherOrder []string) {
 
 	numBytes := 4096
 
-	// Exercise sending data to the server
-	if _, _, err := conn.Conn.SendRequest("drop-me", false, make([]byte, numBytes)); err != nil {
-		t.Fatalf("SendRequest: %v", err)
-	}
-
 	// Exercise receiving data from the server
 	session, err := conn.NewSession()
 	if err != nil {
+		skipIfIssue64959(t, err)
 		t.Fatalf("NewSession: %v", err)
 	}
 
@@ -360,6 +372,11 @@ func testOneCipher(t *testing.T, cipher string, cipherOrder []string) {
 	if len(out) != numBytes {
 		t.Fatalf("got %d bytes, want %d bytes", len(out), numBytes)
 	}
+
+	// Exercise sending data to the server
+	if _, _, err := conn.Conn.SendRequest("drop-me", false, make([]byte, numBytes)); err != nil {
+		t.Fatalf("SendRequest: %v", err)
+	}
 }
 
 var deprecatedCiphers = []string{
@@ -431,7 +448,6 @@ func TestKeyExchanges(t *testing.T) {
 func TestClientAuthAlgorithms(t *testing.T) {
 	for _, key := range []string{
 		"rsa",
-		"dsa",
 		"ecdsa",
 		"ed25519",
 	} {

ssh/test/test_unix_test.go

@@ -178,7 +178,7 @@ func (s *server) TryDial(config *ssh.ClientConfig) (*ssh.Client, error) {
 
 // addr is the user specified host:port. While we don't actually dial it,
 // we need to know this for host key matching
-func (s *server) TryDialWithAddr(config *ssh.ClientConfig, addr string) (*ssh.Client, error) {
+func (s *server) TryDialWithAddr(config *ssh.ClientConfig, addr string) (client *ssh.Client, err error) {
 	sshd, err := exec.LookPath("sshd")
 	if err != nil {
 		s.t.Skipf("skipping test: %v", err)
@@ -188,13 +188,26 @@ func (s *server) TryDialWithAddr(config *ssh.ClientConfig, addr string) (*ssh.Cl
 	if err != nil {
 		s.t.Fatalf("unixConnection: %v", err)
 	}
+	defer func() {
+		// Close c2 after we've started the sshd command so that it won't prevent c1
+		// from returning EOF when the sshd command exits.
+		c2.Close()
+
+		// Leave c1 open if we're returning a client that wraps it.
+		// (The client is responsible for closing it.)
+		// Otherwise, close it to free up the socket.
+		if client == nil {
+			c1.Close()
+		}
+	}()
 
-	cmd := testenv.Command(s.t, sshd, "-f", s.configfile, "-i", "-e")
 	f, err := c2.File()
 	if err != nil {
 		s.t.Fatalf("UnixConn.File: %v", err)
 	}
 	defer f.Close()
+
+	cmd := testenv.Command(s.t, sshd, "-f", s.configfile, "-i", "-e")
 	cmd.Stdin = f
 	cmd.Stdout = f
 	cmd.Stderr = new(bytes.Buffer)
@@ -223,7 +236,7 @@ func (s *server) TryDialWithAddr(config *ssh.ClientConfig, addr string) (*ssh.Cl
 		// processes are killed too.
 		cmd.Process.Signal(os.Interrupt)
 		cmd.Wait()
-		if s.t.Failed() {
+		if s.t.Failed() || testing.Verbose() {
 			// log any output from sshd process
 			s.t.Logf("sshd:\n%s", cmd.Stderr)
 		}

ssh/testdata/keys.go

@@ -46,19 +46,31 @@ FFlRjzoB3Oxu8UQgb+MWPedtH9XYBbg9biz4jJLkXQ==
 -----END EC PRIVATE KEY-----
 `),
 	"rsa": []byte(`-----BEGIN RSA PRIVATE KEY-----
-MIICXAIBAAKBgQC8A6FGHDiWCSREAXCq6yBfNVr0xCVG2CzvktFNRpue+RXrGs/2
-a6ySEJQb3IYquw7HlJgu6fg3WIWhOmHCjfpG0PrL4CRwbqQ2LaPPXhJErWYejcD8
-Di00cF3677+G10KMZk9RXbmHtuBFZT98wxg8j+ZsBMqGM1+7yrWUvynswQIDAQAB
-AoGAJMCk5vqfSRzyXOTXLGIYCuR4Kj6pdsbNSeuuRGfYBeR1F2c/XdFAg7D/8s5R
-38p/Ih52/Ty5S8BfJtwtvgVY9ecf/JlU/rl/QzhG8/8KC0NG7KsyXklbQ7gJT8UT
-Ojmw5QpMk+rKv17ipDVkQQmPaj+gJXYNAHqImke5mm/K/h0CQQDciPmviQ+DOhOq
-2ZBqUfH8oXHgFmp7/6pXw80DpMIxgV3CwkxxIVx6a8lVH9bT/AFySJ6vXq4zTuV9
-6QmZcZzDAkEA2j/UXJPIs1fQ8z/6sONOkU/BjtoePFIWJlRxdN35cZjXnBraX5UR
-fFHkePv4YwqmXNqrBOvSu+w2WdSDci+IKwJAcsPRc/jWmsrJW1q3Ha0hSf/WG/Bu
-X7MPuXaKpP/DkzGoUmb8ks7yqj6XWnYkPNLjCc8izU5vRwIiyWBRf4mxMwJBAILa
-NDvRS0rjwt6lJGv7zPZoqDc65VfrK2aNyHx2PgFyzwrEOtuF57bu7pnvEIxpLTeM
-z26i6XVMeYXAWZMTloMCQBbpGgEERQpeUknLBqUHhg/wXF6+lFA+vEGnkY+Dwab2
-KCXFGd+SQ5GdUcEMe9isUH6DYj/6/yCDoFrXXmpQb+M=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 -----END RSA PRIVATE KEY-----
 `),
 	"pkcs8": []byte(`-----BEGIN PRIVATE KEY-----
@@ -190,17 +202,17 @@ var SSHCertificates = map[string][]byte{
 	//
 	// 2. Assumes "ca" key above in file named "ca", sign a cert for "rsa.pub":
 	//    ssh-keygen -s ca -h -n host.example.com -V +500w -I host.example.com-key rsa.pub
-	"rsa": []byte(`ssh-rsa-cert-v01@openssh.com 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 host.example.com
+	"rsa": []byte(`ssh-rsa-cert-v01@openssh.com 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 host.example.com
 `),
-	"rsa-sha2-256": []byte(`ssh-rsa-cert-v01@openssh.com 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 host.example.com
+	"rsa-sha2-256": []byte(`ssh-rsa-cert-v01@openssh.com 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 host.example.com
 `),
-	"rsa-sha2-512": []byte(`ssh-rsa-cert-v01@openssh.com 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 host.example.com
+	"rsa-sha2-512": []byte(`ssh-rsa-cert-v01@openssh.com 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 host.example.com
 `),
 	// Assumes "ca" key above in file named "ca", sign a user cert for "rsa.pub"
 	// using "testcertificate" as principal:
 	//
 	// ssh-keygen -s ca -I username -n testcertificate rsa.pub
-	"rsa-user-testcertificate": []byte(`ssh-rsa-cert-v01@openssh.com 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 rsa.pub
+	"rsa-user-testcertificate": []byte(`ssh-rsa-cert-v01@openssh.com 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 rsa.pub
 `),
 }
 

ssh/transport.go

@@ -49,6 +49,9 @@ type transport struct {
 	rand      io.Reader
 	isClient  bool
 	io.Closer
+
+	strictMode     bool
+	initialKEXDone bool
 }
 
 // packetCipher represents a combination of SSH encryption/MAC
@@ -74,6 +77,18 @@ type connectionState struct {
 	pendingKeyChange chan packetCipher
 }
 
+func (t *transport) setStrictMode() error {
+	if t.reader.seqNum != 1 {
+		return errors.New("ssh: sequence number != 1 when strict KEX mode requested")
+	}
+	t.strictMode = true
+	return nil
+}
+
+func (t *transport) setInitialKEXDone() {
+	t.initialKEXDone = true
+}
+
 // prepareKeyChange sets up key material for a keychange. The key changes in
 // both directions are triggered by reading and writing a msgNewKey packet
 // respectively.
@@ -112,11 +127,12 @@ func (t *transport) printPacket(p []byte, write bool) {
 // Read and decrypt next packet.
 func (t *transport) readPacket() (p []byte, err error) {
 	for {
-		p, err = t.reader.readPacket(t.bufReader)
+		p, err = t.reader.readPacket(t.bufReader, t.strictMode)
 		if err != nil {
 			break
 		}
-		if len(p) == 0 || (p[0] != msgIgnore && p[0] != msgDebug) {
+		// in strict mode we pass through DEBUG and IGNORE packets only during the initial KEX
+		if len(p) == 0 || (t.strictMode && !t.initialKEXDone) || (p[0] != msgIgnore && p[0] != msgDebug) {
 			break
 		}
 	}
@@ -127,7 +143,7 @@ func (t *transport) readPacket() (p []byte, err error) {
 	return p, err
 }
 
-func (s *connectionState) readPacket(r *bufio.Reader) ([]byte, error) {
+func (s *connectionState) readPacket(r *bufio.Reader, strictMode bool) ([]byte, error) {
 	packet, err := s.packetCipher.readCipherPacket(s.seqNum, r)
 	s.seqNum++
 	if err == nil && len(packet) == 0 {
@@ -140,6 +156,9 @@ func (s *connectionState) readPacket(r *bufio.Reader) ([]byte, error) {
 			select {
 			case cipher := <-s.pendingKeyChange:
 				s.packetCipher = cipher
+				if strictMode {
+					s.seqNum = 0
+				}
 			default:
 				return nil, errors.New("ssh: got bogus newkeys message")
 			}
@@ -170,10 +189,10 @@ func (t *transport) writePacket(packet []byte) error {
 	if debugTransport {
 		t.printPacket(packet, true)
 	}
-	return t.writer.writePacket(t.bufWriter, t.rand, packet)
+	return t.writer.writePacket(t.bufWriter, t.rand, packet, t.strictMode)
 }
 
-func (s *connectionState) writePacket(w *bufio.Writer, rand io.Reader, packet []byte) error {
+func (s *connectionState) writePacket(w *bufio.Writer, rand io.Reader, packet []byte, strictMode bool) error {
 	changeKeys := len(packet) > 0 && packet[0] == msgNewKeys
 
 	err := s.packetCipher.writeCipherPacket(s.seqNum, w, rand, packet)
@@ -188,6 +207,9 @@ func (s *connectionState) writePacket(w *bufio.Writer, rand io.Reader, packet []
 		select {
 		case cipher := <-s.pendingKeyChange:
 			s.packetCipher = cipher
+			if strictMode {
+				s.seqNum = 0
+			}
 		default:
 			panic("ssh: no key material for msgNewKeys")
 		}

x509roots/fallback/bundle.go

@@ -446,43 +446,6 @@ f9DEMnDAGf/JOC0ULGb0QkTmVXYbgBVX/8Cnp6o5qtjTcNAuuuuUavpfNIbnYrX9
 ivAwhZTJryQCL2/W3Wf+47BVTwSYT6RBVuKT0Gro1vP7ZeDOdcQxWQzugsgMYDNK
 GbqEZycPvEJdvSRUDewdcAZfpLz6IHxV
 -----END CERTIFICATE-----
-# CN=Autoridad de Certificacion Firmaprofesional CIF A62634068,C=ES
-# 04048028bf1f2864d48f9ad4d83294366a828856553f3b14303f90147f5d40ef
------BEGIN CERTIFICATE-----
-MIIGFDCCA/ygAwIBAgIIU+w77vuySF8wDQYJKoZIhvcNAQEFBQAwUTELMAkGA1UE
-BhMCRVMxQjBABgNVBAMMOUF1dG9yaWRhZCBkZSBDZXJ0aWZpY2FjaW9uIEZpcm1h
-cHJvZmVzaW9uYWwgQ0lGIEE2MjYzNDA2ODAeFw0wOTA1MjAwODM4MTVaFw0zMDEy
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------END CERTIFICATE-----
 # CN=BJCA Global Root CA1,O=BEIJING CERTIFICATE AUTHORITY,C=CN
 # f3896f88fe7c0a882766a7fa6ad2749fb57a7f3e98fb769c1fa7b09c2c44d5ae
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----
+# CN=CommScope Public Trust ECC Root-01,O=CommScope,C=US
+# 11437cda7bb45e41365f45b39a38986b0de00def348e0c7bb0873633800bc38b
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+# CN=CommScope Public Trust ECC Root-02,O=CommScope,C=US
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+-----BEGIN CERTIFICATE-----
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+# CN=CommScope Public Trust RSA Root-01,O=CommScope,C=US
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+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+# CN=CommScope Public Trust RSA Root-02,O=CommScope,C=US
+# ffe943d793424b4f7c440c1c3d648d5363f34b82dc87aa7a9f118fc5dee101f1
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
 # CN=D-TRUST BR Root CA 1 2020,O=D-Trust GmbH,C=DE
 # e59aaa816009c22bff5b25bad37df306f049797c1f81d85ab089e657bd8f0044
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----
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------BEGIN CERTIFICATE-----
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------END CERTIFICATE-----
 # CN=TWCA Global Root CA,OU=Root CA,O=TAIWAN-CA,C=TW
 # 59769007f7685d0fcd50872f9f95d5755a5b2b457d81f3692b610a98672f0e1b
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----
+# CN=Telekom Security TLS ECC Root 2020,O=Deutsche Telekom Security GmbH,C=DE
+# 578af4ded0853f4e5998db4aeaf9cbea8d945f60b620a38d1a3c13b2bc7ba8e1
+-----BEGIN CERTIFICATE-----
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+27iQ7t0l
+-----END CERTIFICATE-----
+# CN=Telekom Security TLS RSA Root 2023,O=Deutsche Telekom Security GmbH,C=DE
+# efc65cadbb59adb6efe84da22311b35624b71b3b1ea0da8b6655174ec8978646
+-----BEGIN CERTIFICATE-----
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+dTdmQRCsu/WU48IxK63nI1bMNSWSs1A=
+-----END CERTIFICATE-----
 # CN=Telia Root CA v2,O=Telia Finland Oyj,C=FI
 # 242b69742fcb1e5b2abf98898b94572187544e5b4d9911786573621f6a74b82c
 -----BEGIN CERTIFICATE-----
@@ -3167,6 +3252,58 @@ t88NkvuOGKmYSdGe/mBEciG5Ge3C9THxOUiIkCR1VBatzvT4aRRkOfujuLpwQMcn
 HL/EVlP6Y2XQ8xwOFvVrhlhNGNTkDY6lnVuR3HYkUD/GKvvZt5y11ubQ2egZixVx
 SK236thZiNSQvxaz2emsWWFUyBy6ysHK4bkgTI86k4mloMy/0/Z1pHWWbVY=
 -----END CERTIFICATE-----
+# CN=TrustAsia Global Root CA G3,O=TrustAsia Technologies\, Inc.,C=CN
+# e0d3226aeb1163c2e48ff9be3b50b4c6431be7bb1eacc5c36b5d5ec509039a08
+-----BEGIN CERTIFICATE-----
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+FGWsJwt0ivKH
+-----END CERTIFICATE-----
+# CN=TrustAsia Global Root CA G4,O=TrustAsia Technologies\, Inc.,C=CN
+# be4b56cb5056c0136a526df444508daa36a0b54f42e4ac38f72af470e479654c
+-----BEGIN CERTIFICATE-----
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+/bpV6wfEU6s3qe4hsiFbYI89MvHVI5TWWA==
+-----END CERTIFICATE-----
 # CN=Trustwave Global Certification Authority,O=Trustwave Holdings\, Inc.,L=Chicago,ST=Illinois,C=US
 # 97552015f5ddfc3c8788c006944555408894450084f100867086bc1a2bb58dc8
 -----BEGIN CERTIFICATE-----
@@ -3627,28 +3764,6 @@ HmyW74cNxA9hi63ugyuV+I6ShHI56yDqg+2DzZduCLzrTia2cyvk0/ZM/iZx4mER
 dEr/VxqHD3VILs9RaRegAhJhldXRQLIQTO7ErBBDpqWeCtWVYpoNz4iCxTIM5Cuf
 ReYNnyicsbkqWletNw+vHX/bvZ8=
 -----END CERTIFICATE-----
-# OU=Security Communication RootCA1,O=SECOM Trust.net,C=JP
-# e75e72ed9f560eec6eb4800073a43fc3ad19195a392282017895974a99026b6c
------BEGIN CERTIFICATE-----
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------END CERTIFICATE-----
 # OU=Security Communication RootCA2,O=SECOM Trust Systems CO.\,LTD.,C=JP
 # 513b2cecb810d4cde5dd85391adfc6c2dd60d87bb736d2b521484aa47a0ebef6
 -----BEGIN CERTIFICATE-----

x509roots/nss/parser.go

@@ -147,6 +147,20 @@ func parseTrustClass(s *bufio.Scanner) ([sha1.Size]byte, *trustObj, error) {
 	return h, to, nil
 }
 
+// manualExclusions contains a map of SHA1 fingerprints of roots that we manually exclude
+// from the bundle for various reasons.
+var manualExclusions = map[string]bool{
+	// TUBITAK Kamu SM SSL Kok Sertifikasi - Surum 1
+	// We exclude this root because mozilla manually constrains this root to
+	// issue names under .tr, but this information is only encoded in the CCADB
+	// IncludedCACertificateReport, in a field the format of which is
+	// undocumented, and is only used for this particular certificate. Rather
+	// than adding special parsing for this, we skip it. When code constraint
+	// support is available, we may also want to simply add a manual constraint,
+	// rather than a manual exclusion.
+	"3143649becce27eced3a3f0b8f0de4e891ddeeca": true,
+}
+
 // Parse parses a NSS certdata.txt formatted file, returning only
 // trusted serverAuth roots, as well as any additional constraints. This parser
 // is very opinionated, only returning roots that are currently trusted for
@@ -248,6 +262,9 @@ func Parse(r io.Reader) ([]*Certificate, error) {
 		if !e.trust.trusted {
 			continue
 		}
+		if manualExclusions[fmt.Sprintf("%x", h)] {
+			continue
+		}
 		nssCert := &Certificate{X509: e.cert.c}
 		if e.cert.DistrustAfter != nil {
 			nssCert.Constraints = append(nssCert.Constraints, DistrustAfter(*e.cert.DistrustAfter))