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authorDamien Miller <djm@cvs.openbsd.org>2020-06-22 06:00:07 +0000
committerDamien Miller <djm@cvs.openbsd.org>2020-06-22 06:00:07 +0000
commitfc72d7d2e4841b5fbe51d50adfebf57629be09ba (patch)
tree58a02e83f012045a400bba54ce238b09edcde39e
parentb08c1f86c7ac895d3550c60981573560a35e6e3c (diff)
add support for verification of webauthn sshsig signature, and
example HTML/JS to generate webauthn signatures in SSH formats (also used to generate the testdata/* for the test).
Diffstat
-rw-r--r--regress/usr.bin/ssh/unittests/sshsig/testdata/ecdsa_sk_webauthn.pub1
-rw-r--r--regress/usr.bin/ssh/unittests/sshsig/testdata/ecdsa_sk_webauthn.sig13
-rw-r--r--regress/usr.bin/ssh/unittests/sshsig/tests.c19
-rw-r--r--regress/usr.bin/ssh/unittests/sshsig/webauthn.html692
4 files changed, 718 insertions, 7 deletions
diff --git a/regress/usr.bin/ssh/unittests/sshsig/testdata/ecdsa_sk_webauthn.pub b/regress/usr.bin/ssh/unittests/sshsig/testdata/ecdsa_sk_webauthn.pub
new file mode 100644
index 00000000000..1597302ce70
--- /dev/null
+++ b/regress/usr.bin/ssh/unittests/sshsig/testdata/ecdsa_sk_webauthn.pub
@@ -0,0 +1 @@
+sk-ecdsa-sha2-nistp256@openssh.com AAAAInNrLWVjZHNhLXNoYTItbmlzdHAyNTZAb3BlbnNzaC5jb20AAAAIbmlzdHAyNTYAAABBBBRGwDjs4HhJFcn4tJ5Gr72KcmRmCS1OirETxaXvnsNApgoOLF1a/7rxldfSMHm73eT1nhHe97W8qicPPEAKDJQAAAALbWluZHJvdC5vcmc=
diff --git a/regress/usr.bin/ssh/unittests/sshsig/testdata/ecdsa_sk_webauthn.sig b/regress/usr.bin/ssh/unittests/sshsig/testdata/ecdsa_sk_webauthn.sig
new file mode 100644
index 00000000000..4bdd8edc681
--- /dev/null
+++ b/regress/usr.bin/ssh/unittests/sshsig/testdata/ecdsa_sk_webauthn.sig
@@ -0,0 +1,13 @@
+-----BEGIN SSH SIGNATURE-----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=
+-----END SSH SIGNATURE-----
diff --git a/regress/usr.bin/ssh/unittests/sshsig/tests.c b/regress/usr.bin/ssh/unittests/sshsig/tests.c
index ce59b96a2e0..728451ebb9a 100644
--- a/regress/usr.bin/ssh/unittests/sshsig/tests.c
+++ b/regress/usr.bin/ssh/unittests/sshsig/tests.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: tests.c,v 1.1 2020/06/19 04:32:09 djm Exp $ */
+/* $OpenBSD: tests.c,v 1.2 2020/06/22 06:00:06 djm Exp $ */
/*
* Regress test for sshbuf.h buffer API
*
@@ -92,27 +92,32 @@ tests(void)
TEST_DONE();
TEST_START("check RSA signature");
- check_sig("rsa", "rsa.sig", msg, namespace);
+ check_sig("rsa.pub", "rsa.sig", msg, namespace);
TEST_DONE();
TEST_START("check DSA signature");
- check_sig("dsa", "dsa.sig", msg, namespace);
+ check_sig("dsa.pub", "dsa.sig", msg, namespace);
TEST_DONE();
TEST_START("check ECDSA signature");
- check_sig("ecdsa", "ecdsa.sig", msg, namespace);
+ check_sig("ecdsa.pub", "ecdsa.sig", msg, namespace);
TEST_DONE();
TEST_START("check ED25519 signature");
- check_sig("ed25519", "ed25519.sig", msg, namespace);
+ check_sig("ed25519.pub", "ed25519.sig", msg, namespace);
TEST_DONE();
TEST_START("check ECDSA-SK signature");
- check_sig("ecdsa_sk", "ecdsa_sk.sig", msg, namespace);
+ check_sig("ecdsa_sk.pub", "ecdsa_sk.sig", msg, namespace);
TEST_DONE();
TEST_START("check ED25519-SK signature");
- check_sig("ed25519_sk", "ed25519_sk.sig", msg, namespace);
+ check_sig("ed25519_sk.pub", "ed25519_sk.sig", msg, namespace);
+ TEST_DONE();
+
+ TEST_START("check ECDSA-SK webauthn signature");
+ check_sig("ecdsa_sk_webauthn.pub", "ecdsa_sk_webauthn.sig",
+ msg, namespace);
TEST_DONE();
sshbuf_free(msg);
diff --git a/regress/usr.bin/ssh/unittests/sshsig/webauthn.html b/regress/usr.bin/ssh/unittests/sshsig/webauthn.html
new file mode 100644
index 00000000000..953041e61ec
--- /dev/null
+++ b/regress/usr.bin/ssh/unittests/sshsig/webauthn.html
@@ -0,0 +1,692 @@
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
+<title>webauthn test</title>
+</head>
+<body onload="init()">
+<h1>webauthn test</h1>
+<p>
+This is a demo/test page for generating FIDO keys and signatures in SSH
+formats. The page initially displays a form to generate a FIDO key and
+convert it to a SSH public key.
+</p>
+<p>
+Once a key has been generated, an additional form will be displayed to
+allow signing of data using the just-generated key. The data may be signed
+as either a raw SSH signature or wrapped in a sshsig message (the latter is
+easier to test using command-line tools.
+</p>
+<p>
+Lots of debugging is printed along the way.
+</p>
+<h2>Enroll</h2>
+<span id="error" style="color: #800; font-weight: bold; font-size: 150%;"></span>
+<form id="enrollform">
+<table>
+<tr>
+<td><b>Username:</b></td>
+<td><input id="username" type="text" size="20" name="user" value="test" /></td>
+</tr>
+<tr><td></td><td><input id="assertsubmit" type="submit" value="submit" /></td></tr>
+</table>
+</form>
+<span id="enrollresult" style="visibility: hidden;">
+<h2>clientData</h2>
+<pre id="enrollresultjson" style="color: #008; font-family: monospace;"></pre>
+<h2>attestationObject raw</h2>
+<pre id="enrollresultraw" style="color: #008; font-family: monospace;"></pre>
+<h2>attestationObject</h2>
+<pre id="enrollresultattestobj" style="color: #008; font-family: monospace;"></pre>
+<h2>authData raw</h2>
+<pre id="enrollresultauthdataraw" style="color: #008; font-family: monospace;"></pre>
+<h2>authData</h2>
+<pre id="enrollresultauthdata" style="color: #008; font-family: monospace;"></pre>
+<h2>SSH pubkey blob</h2>
+<pre id="enrollresultpkblob" style="color: #008; font-family: monospace;"></pre>
+<h2>SSH pubkey string</h2>
+<pre id="enrollresultpk" style="color: #008; font-family: monospace;"></pre>
+</span>
+<span id="assertsection" style="visibility: hidden;">
+<h2>Assert</h2>
+<form id="assertform">
+<span id="asserterror" style="color: #800; font-weight: bold;"></span>
+<table>
+<tr>
+<td><b>Data to sign:</b></td>
+<td><input id="message" type="text" size="20" name="message" value="test" /></td>
+</tr>
+<tr>
+<td><input id="message_sshsig" type="checkbox" checked /> use sshsig format</td>
+</tr>
+<tr>
+<td><b>Signature namespace:</b></td>
+<td><input id="message_namespace" type="text" size="20" name="namespace" value="test" /></td>
+</tr>
+<tr><td></td><td><input type="submit" value="submit" /></td></tr>
+</table>
+</form>
+</span>
+<span id="assertresult" style="visibility: hidden;">
+<h2>clientData</h2>
+<pre id="assertresultjson" style="color: #008; font-family: monospace;"></pre>
+<h2>signature raw</h2>
+<pre id="assertresultsigraw" style="color: #008; font-family: monospace;"></pre>
+<h2>authenticatorData raw</h2>
+<pre id="assertresultauthdataraw" style="color: #008; font-family: monospace;"></pre>
+<h2>authenticatorData</h2>
+<pre id="assertresultauthdata" style="color: #008; font-family: monospace;"></pre>
+<h2>signature in SSH format</h2>
+<pre id="assertresultsshsigraw" style="color: #008; font-family: monospace;"></pre>
+<h2>signature in SSH format (base64 encoded)</h2>
+<pre id="assertresultsshsigb64" style="color: #008; font-family: monospace;"></pre>
+</span>
+</body>
+<script>
+// ------------------------------------------------------------------
+// a crappy CBOR decoder - 20200401 djm@openbsd.org
+
+var CBORDecode = function(buffer) {
+ this.buf = buffer
+ this.v = new DataView(buffer)
+ this.offset = 0
+}
+
+CBORDecode.prototype.empty = function() {
+ return this.offset >= this.buf.byteLength
+}
+
+CBORDecode.prototype.getU8 = function() {
+ let r = this.v.getUint8(this.offset)
+ this.offset += 1
+ return r
+}
+
+CBORDecode.prototype.getU16 = function() {
+ let r = this.v.getUint16(this.offset)
+ this.offset += 2
+ return r
+}
+
+CBORDecode.prototype.getU32 = function() {
+ let r = this.v.getUint32(this.offset)
+ this.offset += 4
+ return r
+}
+
+CBORDecode.prototype.getU64 = function() {
+ let r = this.v.getUint64(this.offset)
+ this.offset += 8
+ return r
+}
+
+CBORDecode.prototype.getCBORTypeLen = function() {
+ let tl, t, l
+ tl = this.getU8()
+ t = (tl & 0xe0) >> 5
+ l = tl & 0x1f
+ return [t, this.decodeInteger(l)]
+}
+
+CBORDecode.prototype.decodeInteger = function(len) {
+ switch (len) {
+ case 0x18: return this.getU8()
+ case 0x19: return this.getU16()
+ case 0x20: return this.getU32()
+ case 0x21: return this.getU64()
+ default:
+ if (len <= 23) {
+ return len
+ }
+ throw new Error("Unsupported int type 0x" + len.toString(16))
+ }
+}
+
+CBORDecode.prototype.decodeNegint = function(len) {
+ let r = -(this.decodeInteger(len) + 1)
+ return r
+}
+
+CBORDecode.prototype.decodeByteString = function(len) {
+ let r = this.buf.slice(this.offset, this.offset + len)
+ this.offset += len
+ return r
+}
+
+CBORDecode.prototype.decodeTextString = function(len) {
+ let u8dec = new TextDecoder('utf-8')
+ r = u8dec.decode(this.decodeByteString(len))
+ return r
+}
+
+CBORDecode.prototype.decodeArray = function(len, level) {
+ let r = []
+ for (let i = 0; i < len; i++) {
+ let v = this.decodeInternal(level)
+ r.push(v)
+ // console.log("decodeArray level " + level.toString() + " index " + i.toString() + " value " + JSON.stringify(v))
+ }
+ return r
+}
+
+CBORDecode.prototype.decodeMap = function(len, level) {
+ let r = {}
+ for (let i = 0; i < len; i++) {
+ let k = this.decodeInternal(level)
+ let v = this.decodeInternal(level)
+ r[k] = v
+ // console.log("decodeMap level " + level.toString() + " key " + k.toString() + " value " + JSON.stringify(v))
+ // XXX check string keys, duplicates
+ }
+ return r
+}
+
+CBORDecode.prototype.decodePrimitive = function(t) {
+ switch (t) {
+ case 20: return false
+ case 21: return true
+ case 22: return null
+ case 23: return undefined
+ default:
+ throw new Error("Unsupported primitive 0x" + t.toString(2))
+ }
+}
+
+CBORDecode.prototype.decodeInternal = function(level) {
+ if (level > 256) {
+ throw new Error("CBOR nesting too deep")
+ }
+ let t, l, r
+ [t, l] = this.getCBORTypeLen()
+ // console.log("decode level " + level.toString() + " type " + t.toString() + " len " + l.toString())
+ switch (t) {
+ case 0:
+ r = this.decodeInteger(l)
+ break
+ case 1:
+ r = this.decodeNegint(l)
+ break
+ case 2:
+ r = this.decodeByteString(l)
+ break
+ case 3:
+ r = this.decodeTextString(l)
+ break
+ case 4:
+ r = this.decodeArray(l, level + 1)
+ break
+ case 5:
+ r = this.decodeMap(l, level + 1)
+ break
+ case 6:
+ console.log("XXX ignored semantic tag " + this.decodeInteger(l).toString())
+ break;
+ case 7:
+ r = this.decodePrimitive(l)
+ break
+ default:
+ throw new Error("Unsupported type 0x" + t.toString(2) + " len " + l.toString())
+ }
+ // console.log("decode level " + level.toString() + " value " + JSON.stringify(r))
+ return r
+}
+
+CBORDecode.prototype.decode = function() {
+ return this.decodeInternal(0)
+}
+
+// ------------------------------------------------------------------
+// a crappy SSH message packer - 20200401 djm@openbsd.org
+
+var SSHMSG = function() {
+ this.r = []
+}
+
+SSHMSG.prototype.serialise = function() {
+ let len = 0
+ for (buf of this.r) {
+ len += buf.length
+ }
+ let r = new ArrayBuffer(len)
+ let v = new Uint8Array(r)
+ let offset = 0
+ for (buf of this.r) {
+ v.set(buf, offset)
+ offset += buf.length
+ }
+ if (offset != r.byteLength) {
+ throw new Error("djm can't count")
+ }
+ return r
+}
+
+SSHMSG.prototype.serialiseBase64 = function(v) {
+ let b = this.serialise()
+ return btoa(String.fromCharCode(...new Uint8Array(b)));
+}
+
+SSHMSG.prototype.putU8 = function(v) {
+ this.r.push(new Uint8Array([v]))
+}
+
+SSHMSG.prototype.putU32 = function(v) {
+ this.r.push(new Uint8Array([
+ (v >> 24) & 0xff,
+ (v >> 16) & 0xff,
+ (v >> 8) & 0xff,
+ (v & 0xff)
+ ]))
+}
+
+SSHMSG.prototype.put = function(v) {
+ this.r.push(new Uint8Array(v))
+}
+
+SSHMSG.prototype.putString = function(v) {
+ let enc = new TextEncoder();
+ let venc = enc.encode(v)
+ this.putU32(venc.length)
+ this.put(venc)
+}
+
+SSHMSG.prototype.putSSHMSG = function(v) {
+ let msg = v.serialise()
+ this.putU32(msg.byteLength)
+ this.put(msg)
+}
+
+SSHMSG.prototype.putBytes = function(v) {
+ this.putU32(v.byteLength)
+ this.put(v)
+}
+
+SSHMSG.prototype.putECPoint = function(x, y) {
+ let x8 = new Uint8Array(x)
+ let y8 = new Uint8Array(y)
+ this.putU32(1 + x8.length + y8.length)
+ this.putU8(0x04) // Uncompressed point format.
+ this.put(x8)
+ this.put(y8)
+}
+
+// ------------------------------------------------------------------
+// webauthn to SSH glue - djm@openbsd.org 20200408
+
+function error(msg, ...args) {
+ document.getElementById("error").innerText = msg
+ console.log(msg)
+ for (const arg of args) {
+ console.dir(arg)
+ }
+}
+function hexdump(buf) {
+ const hex = Array.from(new Uint8Array(buf)).map(
+ b => b.toString(16).padStart(2, "0"))
+ const fmt = new Array()
+ for (let i = 0; i < hex.length; i++) {
+ if ((i % 16) == 0) {
+ // Prepend length every 16 bytes.
+ fmt.push(i.toString(16).padStart(4, "0"))
+ fmt.push(" ")
+ }
+ fmt.push(hex[i])
+ fmt.push(" ")
+ if ((i % 16) == 15) {
+ fmt.push("\n")
+ }
+ }
+ return fmt.join("")
+}
+function enrollform_submit(event) {
+ event.preventDefault();
+ console.log("submitted")
+ username = event.target.elements.username.value
+ if (username === "") {
+ error("no username specified")
+ return false
+ }
+ enrollStart(username)
+}
+function enrollStart(username) {
+ let challenge = new Uint8Array(32)
+ window.crypto.getRandomValues(challenge)
+ let userid = new Uint8Array(8)
+ window.crypto.getRandomValues(userid)
+
+ console.log("challenge:" + btoa(challenge))
+ console.log("userid:" + btoa(userid))
+
+ let pkopts = {
+ challenge: challenge,
+ rp: {
+ name: "mindrot.org",
+ id: "mindrot.org",
+ },
+ user: {
+ id: userid,
+ name: username,
+ displayName: username,
+ },
+ authenticatorSelection: {
+ authenticatorAttachment: "cross-platform",
+ userVerification: "discouraged",
+ },
+ pubKeyCredParams: [{alg: -7, type: "public-key"}], // ES256
+ timeout: 30 * 1000,
+ };
+ console.dir(pkopts)
+ window.enrollOpts = pkopts
+ let credpromise = navigator.credentials.create({ publicKey: pkopts });
+ credpromise.then(enrollSuccess, enrollFailure)
+}
+function enrollFailure(result) {
+ error("Enroll failed", result)
+}
+function enrollSuccess(result) {
+ console.log("Enroll succeeded")
+ console.dir(result)
+ window.enrollResult = result
+ document.getElementById("enrollresult").style.visibility = "visible"
+
+ // Show the clientData
+ let u8dec = new TextDecoder('utf-8')
+ clientData = u8dec.decode(result.response.clientDataJSON)
+ document.getElementById("enrollresultjson").innerText = clientData
+
+ // Decode and show the attestationObject
+ document.getElementById("enrollresultraw").innerText = hexdump(result.response.attestationObject)
+ let aod = new CBORDecode(result.response.attestationObject)
+ let attestationObject = aod.decode()
+ console.log("attestationObject")
+ console.dir(attestationObject)
+ document.getElementById("enrollresultattestobj").innerText = JSON.stringify(attestationObject)
+
+ // Decode and show the authData
+ document.getElementById("enrollresultauthdataraw").innerText = hexdump(attestationObject.authData)
+ let authData = decodeAuthenticatorData(attestationObject.authData, true)
+ console.log("authData")
+ console.dir(authData)
+ window.enrollAuthData = authData
+ document.getElementById("enrollresultauthdata").innerText = JSON.stringify(authData)
+
+ // Reformat the pubkey as a SSH key for easy verification
+ window.rawKey = reformatPubkey(authData.attestedCredentialData.credentialPublicKey, window.enrollOpts.rp.id)
+ console.log("SSH pubkey blob")
+ console.dir(window.rawKey)
+ document.getElementById("enrollresultpkblob").innerText = hexdump(window.rawKey)
+ let pk64 = btoa(String.fromCharCode(...new Uint8Array(window.rawKey)));
+ let pk = "sk-ecdsa-sha2-nistp256@openssh.com " + pk64
+ document.getElementById("enrollresultpk").innerText = pk
+
+ // Success: show the assertion form.
+ document.getElementById("assertsection").style.visibility = "visible"
+}
+
+function decodeAuthenticatorData(authData, expectCred) {
+ let r = new Object()
+ let v = new DataView(authData)
+
+ r.rpIdHash = authData.slice(0, 32)
+ r.flags = v.getUint8(32)
+ r.signCount = v.getUint32(33)
+
+ // Decode attestedCredentialData if present.
+ let offset = 37
+ let acd = new Object()
+ if (expectCred) {
+ acd.aaguid = authData.slice(offset, offset+16)
+ offset += 16
+ let credentialIdLength = v.getUint16(offset)
+ offset += 2
+ acd.credentialIdLength = credentialIdLength
+ acd.credentialId = authData.slice(offset, offset+credentialIdLength)
+ offset += credentialIdLength
+ r.attestedCredentialData = acd
+ }
+ console.log("XXXXX " + offset.toString())
+ let pubkeyrest = authData.slice(offset, authData.byteLength)
+ let pkdecode = new CBORDecode(pubkeyrest)
+ if (expectCred) {
+ // XXX unsafe: doesn't mandate COSE canonical format.
+ acd.credentialPublicKey = pkdecode.decode()
+ }
+ if (!pkdecode.empty()) {
+ // Decode extensions if present.
+ r.extensions = pkdecode.decode()
+ }
+ return r
+}
+
+function reformatPubkey(pk, rpid) {
+ // pk is in COSE format. We only care about a tiny subset.
+ if (pk[1] != 2) {
+ console.dir(pk)
+ throw new Error("pubkey is not EC")
+ }
+ if (pk[-1] != 1) {
+ throw new Error("pubkey is not in P256")
+ }
+ if (pk[3] != -7) {
+ throw new Error("pubkey is not ES256")
+ }
+ if (pk[-2].byteLength != 32 || pk[-3].byteLength != 32) {
+ throw new Error("pubkey EC coords have bad length")
+ }
+ let msg = new SSHMSG()
+ msg.putString("sk-ecdsa-sha2-nistp256@openssh.com") // Key type
+ msg.putString("nistp256") // Key curve
+ msg.putECPoint(pk[-2], pk[-3]) // EC key
+ msg.putString(rpid) // RP ID
+ return msg.serialise()
+}
+
+async function assertform_submit(event) {
+ event.preventDefault();
+ console.log("submitted")
+ message = event.target.elements.message.value
+ if (message === "") {
+ error("no message specified")
+ return false
+ }
+ let enc = new TextEncoder()
+ let encmsg = enc.encode(message)
+ window.assertSignRaw = !event.target.elements.message_sshsig.checked
+ console.log("using sshsig ", !window.assertSignRaw)
+ if (window.assertSignRaw) {
+ assertStart(encmsg)
+ return
+ }
+ // Format a sshsig-style message.
+ window.sigHashAlg = "sha512"
+ let msghash = await crypto.subtle.digest("SHA-512", encmsg);
+ console.log("raw message hash")
+ console.dir(msghash)
+ window.sigNamespace = event.target.elements.message_namespace.value
+ let sigbuf = new SSHMSG()
+ sigbuf.put(enc.encode("SSHSIG"))
+ sigbuf.putString(window.sigNamespace)
+ sigbuf.putU32(0) // Reserved string
+ sigbuf.putString(window.sigHashAlg)
+ sigbuf.putBytes(msghash)
+ let msg = sigbuf.serialise()
+ console.log("sigbuf")
+ console.dir(msg)
+ assertStart(msg)
+}
+
+function assertStart(message) {
+ let assertReqOpts = {
+ challenge: message,
+ rpId: "mindrot.org",
+ allowCredentials: [{
+ type: 'public-key',
+ id: window.enrollResult.rawId,
+ }],
+ userVerification: "discouraged",
+ timeout: (30 * 1000),
+ }
+ console.log("assertReqOpts")
+ console.dir(assertReqOpts)
+ window.assertReqOpts = assertReqOpts
+ let assertpromise = navigator.credentials.get({
+ publicKey: assertReqOpts
+ });
+ assertpromise.then(assertSuccess, assertFailure)
+}
+function assertFailure(result) {
+ error("Assertion failed", result)
+}
+function linewrap(s) {
+ const linelen = 70
+ let ret = ""
+ for (let i = 0; i < s.length; i += linelen) {
+ end = i + linelen
+ if (end > s.length) {
+ end = s.length
+ }
+ if (i > 0) {
+ ret += "\n"
+ }
+ ret += s.slice(i, end)
+ }
+ return ret + "\n"
+}
+function assertSuccess(result) {
+ console.log("Assertion succeeded")
+ console.dir(result)
+ window.assertResult = result
+ document.getElementById("assertresult").style.visibility = "visible"
+
+ // show the clientData.
+ let u8dec = new TextDecoder('utf-8')
+ clientData = u8dec.decode(result.response.clientDataJSON)
+ document.getElementById("assertresultjson").innerText = clientData
+
+ // show the signature.
+ document.getElementById("assertresultsigraw").innerText = hexdump(result.response.signature)
+
+ // decode and show the authData.
+ document.getElementById("assertresultauthdataraw").innerText = hexdump(result.response.authenticatorData)
+ authData = decodeAuthenticatorData(result.response.authenticatorData, false)
+ document.getElementById("assertresultauthdata").innerText = JSON.stringify(authData)
+
+ // Parse and reformat the signature to an SSH style signature.
+ let sshsig = reformatSignature(result.response.signature, clientData, authData)
+ document.getElementById("assertresultsshsigraw").innerText = hexdump(sshsig)
+ let sig64 = btoa(String.fromCharCode(...new Uint8Array(sshsig)));
+ if (window.assertSignRaw) {
+ document.getElementById("assertresultsshsigb64").innerText = sig64
+ } else {
+ document.getElementById("assertresultsshsigb64").innerText =
+ "-----BEGIN SSH SIGNATURE-----\n" + linewrap(sig64) +
+ "-----END SSH SIGNATURE-----\n";
+ }
+}
+
+function reformatSignature(sig, clientData, authData) {
+ if (sig.byteLength < 2) {
+ throw new Error("signature is too short")
+ }
+ let offset = 0
+ let v = new DataView(sig)
+ // Expect an ASN.1 SEQUENCE that exactly spans the signature.
+ if (v.getUint8(offset) != 0x30) {
+ throw new Error("signature not an ASN.1 sequence")
+ }
+ offset++
+ let seqlen = v.getUint8(offset)
+ offset++
+ if ((seqlen & 0x80) != 0 || seqlen != sig.byteLength - offset) {
+ throw new Error("signature has unexpected length " + seqlen.toString() + " vs expected " + (sig.byteLength - offset).toString())
+ }
+
+ // Parse 'r' INTEGER value.
+ if (v.getUint8(offset) != 0x02) {
+ throw new Error("signature r not an ASN.1 integer")
+ }
+ offset++
+ let rlen = v.getUint8(offset)
+ offset++
+ if ((rlen & 0x80) != 0 || rlen > sig.byteLength - offset) {
+ throw new Error("signature r has unexpected length " + rlen.toString() + " vs buffer " + (sig.byteLength - offset).toString())
+ }
+ let r = sig.slice(offset, offset + rlen)
+ offset += rlen
+ console.log("sig_r")
+ console.dir(r)
+
+ // Parse 's' INTEGER value.
+ if (v.getUint8(offset) != 0x02) {
+ throw new Error("signature r not an ASN.1 integer")
+ }
+ offset++
+ let slen = v.getUint8(offset)
+ offset++
+ if ((slen & 0x80) != 0 || slen > sig.byteLength - offset) {
+ throw new Error("signature s has unexpected length " + slen.toString() + " vs buffer " + (sig.byteLength - offset).toString())
+ }
+ let s = sig.slice(offset, offset + slen)
+ console.log("sig_s")
+ console.dir(s)
+ offset += slen
+
+ if (offset != sig.byteLength) {
+ throw new Error("unexpected final offset during signature parsing " + offset.toString() + " expected " + sig.byteLength.toString())
+ }
+
+ // Reformat as an SSH signature.
+ let clientDataParsed = JSON.parse(clientData)
+ let innersig = new SSHMSG()
+ innersig.putBytes(r)
+ innersig.putBytes(s)
+
+ let rawsshsig = new SSHMSG()
+ rawsshsig.putString("webauthn-sk-ecdsa-sha2-nistp256@openssh.com")
+ rawsshsig.putSSHMSG(innersig)
+ rawsshsig.putU8(authData.flags)
+ rawsshsig.putU32(authData.signCount)
+ rawsshsig.putString(clientDataParsed.origin)
+ rawsshsig.putString(clientData)
+ if (authData.extensions == undefined) {
+ rawsshsig.putU32(0)
+ } else {
+ rawsshsig.putBytes(authData.extensions)
+ }
+
+ if (window.assertSignRaw) {
+ return rawsshsig.serialise()
+ }
+ // Format as SSHSIG.
+ let enc = new TextEncoder()
+ let sshsig = new SSHMSG()
+ sshsig.put(enc.encode("SSHSIG"))
+ sshsig.putU32(0x01) // Signature version.
+ sshsig.putBytes(window.rawKey)
+ sshsig.putString(window.sigNamespace)
+ sshsig.putU32(0) // Reserved string
+ sshsig.putString(window.sigHashAlg)
+ sshsig.putBytes(rawsshsig.serialise())
+ return sshsig.serialise()
+}
+
+function toggleNamespaceVisibility() {
+ const assertsigtype = document.getElementById('message_sshsig');
+ const assertsignamespace = document.getElementById('message_namespace');
+ assertsignamespace.disabled = !assertsigtype.checked;
+}
+
+function init() {
+ if (document.location.protocol != "https:") {
+ error("This page must be loaded via https")
+ const assertsubmit = document.getElementById('assertsubmit')
+ assertsubmit.disabled = true
+ }
+ const enrollform = document.getElementById('enrollform');
+ enrollform.addEventListener('submit', enrollform_submit);
+ const assertform = document.getElementById('assertform');
+ assertform.addEventListener('submit', assertform_submit);
+ const assertsigtype = document.getElementById('message_sshsig');
+ assertsigtype.onclick = toggleNamespaceVisibility;
+}
+</script>
+
+</html>
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-24 09:25:18 +0000