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std.crypto.Tls: add read/write methods

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This commit is contained in:
Andrew Kelley 2022-12-15 20:35:41 -07:00
parent 595fff7cb6
commit 40a85506b2
3 changed files with 458 additions and 136 deletions
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560
lib/std/crypto/Tls.zig
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@ -5,24 +5,24 @@ const mem = std.mem;
const crypto = std.crypto;
const assert = std.debug.assert;
state: State = .start,
x25519_priv_key: [32]u8 = undefined,
x25519_pub_key: [32]u8 = undefined,
x25519_server_pub_key: [32]u8 = undefined,
application_cipher: ApplicationCipher,
read_seq: u64,
write_seq: u64,
/// The size is enough to contain exactly one TLSCiphertext record.
partially_read_buffer: [max_ciphertext_len + ciphertext_record_header_len]u8,
/// The number of partially read bytes inside `partiall_read_buffer`.
partially_read_len: u15,
const ProtocolVersion = enum(u16) {
pub const ciphertext_record_header_len = 5;
pub const max_ciphertext_len = (1 << 14) + 256;
pub const ProtocolVersion = enum(u16) {
tls_1_2 = 0x0303,
tls_1_3 = 0x0304,
_,
};
const State = enum {
/// In this state, all fields are undefined except state.
start,
sent_hello,
};
const ContentType = enum(u8) {
pub const ContentType = enum(u8) {
invalid = 0,
change_cipher_spec = 20,
alert = 21,
@ -31,7 +31,7 @@ const ContentType = enum(u8) {
_,
};
const HandshakeType = enum(u8) {
pub const HandshakeType = enum(u8) {
client_hello = 1,
server_hello = 2,
new_session_ticket = 4,
@ -45,7 +45,7 @@ const HandshakeType = enum(u8) {
message_hash = 254,
};
const ExtensionType = enum(u16) {
pub const ExtensionType = enum(u16) {
/// RFC 6066
server_name = 0,
/// RFC 6066
@ -92,13 +92,13 @@ const ExtensionType = enum(u16) {
key_share = 51,
};
const AlertLevel = enum(u8) {
pub const AlertLevel = enum(u8) {
warning = 1,
fatal = 2,
_,
};
const AlertDescription = enum(u8) {
pub const AlertDescription = enum(u8) {
close_notify = 0,
unexpected_message = 10,
bad_record_mac = 20,
@ -129,7 +129,7 @@ const AlertDescription = enum(u8) {
_,
};
const SignatureScheme = enum(u16) {
pub const SignatureScheme = enum(u16) {
// RSASSA-PKCS1-v1_5 algorithms
rsa_pkcs1_sha256 = 0x0401,
rsa_pkcs1_sha384 = 0x0501,
@ -161,7 +161,7 @@ const SignatureScheme = enum(u16) {
_,
};
const NamedGroup = enum(u16) {
pub const NamedGroup = enum(u16) {
// Elliptic Curve Groups (ECDHE)
secp256r1 = 0x0017,
secp384r1 = 0x0018,
@ -211,7 +211,7 @@ const NamedGroup = enum(u16) {
// * ExtensionType extension_type;
// * opaque extension_data<0..2^16-1>;
const CipherSuite = enum(u16) {
pub const CipherSuite = enum(u16) {
TLS_AES_128_GCM_SHA256 = 0x1301,
TLS_AES_256_GCM_SHA384 = 0x1302,
TLS_CHACHA20_POLY1305_SHA256 = 0x1303,
@ -219,6 +219,73 @@ const CipherSuite = enum(u16) {
TLS_AES_128_CCM_8_SHA256 = 0x1305,
};
pub const CipherParams = union(CipherSuite) {
TLS_AES_128_GCM_SHA256: struct {
const AEAD = crypto.aead.aes_gcm.Aes128Gcm;
const Hash = crypto.hash.sha2.Sha256;
const Hmac = crypto.auth.hmac.Hmac(Hash);
const Hkdf = crypto.kdf.hkdf.Hkdf(Hmac);
handshake_secret: [Hkdf.key_len]u8,
master_secret: [Hkdf.key_len]u8,
client_handshake_key: [AEAD.key_length]u8,
server_handshake_key: [AEAD.key_length]u8,
client_finished_key: [Hmac.key_length]u8,
server_finished_key: [Hmac.key_length]u8,
client_handshake_iv: [AEAD.nonce_length]u8,
server_handshake_iv: [AEAD.nonce_length]u8,
transcript_hash: Hash,
},
TLS_AES_256_GCM_SHA384: struct {
const AEAD = crypto.aead.aes_gcm.Aes256Gcm;
const Hash = crypto.hash.sha2.Sha384;
const Hmac = crypto.auth.hmac.Hmac(Hash);
const Hkdf = crypto.kdf.hkdf.Hkdf(Hmac);
handshake_secret: [Hkdf.key_len]u8,
master_secret: [Hkdf.key_len]u8,
client_handshake_key: [AEAD.key_length]u8,
server_handshake_key: [AEAD.key_length]u8,
client_finished_key: [Hmac.key_length]u8,
server_finished_key: [Hmac.key_length]u8,
client_handshake_iv: [AEAD.nonce_length]u8,
server_handshake_iv: [AEAD.nonce_length]u8,
transcript_hash: Hash,
},
TLS_CHACHA20_POLY1305_SHA256: void,
TLS_AES_128_CCM_SHA256: void,
TLS_AES_128_CCM_8_SHA256: void,
};
/// Encryption parameters for application traffic.
pub const ApplicationCipher = union(CipherSuite) {
TLS_AES_128_GCM_SHA256: struct {
const AEAD = crypto.aead.aes_gcm.Aes128Gcm;
const Hash = crypto.hash.sha2.Sha256;
const Hmac = crypto.auth.hmac.Hmac(Hash);
const Hkdf = crypto.kdf.hkdf.Hkdf(Hmac);
client_key: [AEAD.key_length]u8,
server_key: [AEAD.key_length]u8,
client_iv: [AEAD.nonce_length]u8,
server_iv: [AEAD.nonce_length]u8,
},
TLS_AES_256_GCM_SHA384: struct {
const AEAD = crypto.aead.aes_gcm.Aes256Gcm;
const Hash = crypto.hash.sha2.Sha384;
const Hmac = crypto.auth.hmac.Hmac(Hash);
const Hkdf = crypto.kdf.hkdf.Hkdf(Hmac);
client_key: [AEAD.key_length]u8,
server_key: [AEAD.key_length]u8,
client_iv: [AEAD.nonce_length]u8,
server_iv: [AEAD.nonce_length]u8,
},
TLS_CHACHA20_POLY1305_SHA256: void,
TLS_AES_128_CCM_SHA256: void,
TLS_AES_128_CCM_8_SHA256: void,
};
const cipher_suites = blk: {
const fields = @typeInfo(CipherSuite).Enum.fields;
var result: [(fields.len + 1) * 2]u8 = undefined;
@ -231,10 +298,11 @@ const cipher_suites = blk: {
break :blk result;
};
pub fn init(tls: *Tls, stream: net.Stream, host: []const u8) !void {
assert(tls.state == .start);
crypto.random.bytes(&tls.x25519_priv_key);
tls.x25519_pub_key = crypto.dh.X25519.recoverPublicKey(tls.x25519_priv_key) catch |err| {
/// `host` is only borrowed during this function call.
pub fn init(stream: net.Stream, host: []const u8) !Tls {
var x25519_priv_key: [32]u8 = undefined;
crypto.random.bytes(&x25519_priv_key);
const x25519_pub_key = crypto.dh.X25519.recoverPublicKey(x25519_priv_key) catch |err| {
switch (err) {
// Only possible to happen if the private key is all zeroes.
error.IdentityElement => return error.InsufficientEntropy,
@ -293,7 +361,7 @@ pub fn init(tls: *Tls, stream: net.Stream, host: []const u8) !void {
0, 36, // byte length of client_shares
0x00, 0x1D, // NamedGroup.x25519
0, 32, // byte length of key_exchange
} ++ tls.x25519_pub_key ++ [_]u8{
} ++ x25519_pub_key ++ [_]u8{
// Extension: server_name
0, 0, // ExtensionType.server_name
@ -330,25 +398,23 @@ pub fn init(tls: *Tls, stream: net.Stream, host: []const u8) !void {
mem.writeIntBig(u16, hello_header[hello_header.len - 5 ..][0..2], @intCast(u16, 3 + host.len));
mem.writeIntBig(u16, hello_header[hello_header.len - 2 ..][0..2], @intCast(u16, 0 + host.len));
var iovecs = [_]std.os.iovec_const{
.{
.iov_base = &hello_header,
.iov_len = hello_header.len,
},
.{
.iov_base = host.ptr,
.iov_len = host.len,
},
};
try stream.writevAll(&iovecs);
{
var iovecs = [_]std.os.iovec_const{
.{
.iov_base = &hello_header,
.iov_len = hello_header.len,
},
.{
.iov_base = host.ptr,
.iov_len = host.len,
},
};
try stream.writevAll(&iovecs);
}
const client_hello_bytes1 = hello_header[5..];
var client_handshake_key: [32]u8 = undefined;
var server_handshake_key: [32]u8 = undefined;
var client_handshake_iv: [12]u8 = undefined;
var server_handshake_iv: [12]u8 = undefined;
var cipher_suite: CipherSuite = undefined;
var cipher_params: CipherParams = undefined;
var handshake_buf: [4000]u8 = undefined;
var len: usize = 0;
@ -386,16 +452,16 @@ pub fn init(tls: *Tls, stream: net.Stream, host: []const u8) !void {
const legacy_session_id_echo_len = hello[34];
if (legacy_session_id_echo_len != 0) return error.TlsIllegalParameter;
const cipher_suite_int = mem.readIntBig(u16, hello[35..37]);
cipher_suite = std.meta.intToEnum(CipherSuite, cipher_suite_int) catch
const cipher_suite_tag = std.meta.intToEnum(CipherSuite, cipher_suite_int) catch
return error.TlsIllegalParameter;
std.debug.print("server wants cipher suite {s}\n", .{@tagName(cipher_suite)});
std.debug.print("server wants cipher suite {s}\n", .{@tagName(cipher_suite_tag)});
const legacy_compression_method = hello[37];
_ = legacy_compression_method;
const extensions_size = mem.readIntBig(u16, hello[38..40]);
if (40 + extensions_size != hello.len) return error.TlsBadLength;
var i: usize = 40;
var supported_version: u16 = 0;
var have_server_pub_key = false;
var opt_x25519_server_pub_key: ?*[32]u8 = null;
while (i < hello.len) {
const et = mem.readIntBig(u16, hello[i..][0..2]);
i += 2;
@ -409,7 +475,7 @@ pub fn init(tls: *Tls, stream: net.Stream, host: []const u8) !void {
supported_version = mem.readIntBig(u16, hello[i..][0..2]);
},
@enumToInt(ExtensionType.key_share) => {
if (have_server_pub_key) return error.TlsIllegalParameter;
if (opt_x25519_server_pub_key != null) return error.TlsIllegalParameter;
const named_group = mem.readIntBig(u16, hello[i..][0..2]);
i += 2;
switch (named_group) {
@ -417,8 +483,7 @@ pub fn init(tls: *Tls, stream: net.Stream, host: []const u8) !void {
const key_size = mem.readIntBig(u16, hello[i..][0..2]);
i += 2;
if (key_size != 32) return error.TlsBadLength;
tls.x25519_server_pub_key = hello[i..][0..32].*;
have_server_pub_key = true;
opt_x25519_server_pub_key = hello[i..][0..32];
},
else => {
std.debug.print("named group: {x}\n", .{named_group});
@ -432,7 +497,8 @@ pub fn init(tls: *Tls, stream: net.Stream, host: []const u8) !void {
}
i = next_i;
}
if (!have_server_pub_key) return error.TlsIllegalParameter;
const x25519_server_pub_key = opt_x25519_server_pub_key orelse
return error.TlsIllegalParameter;
const tls_version = if (supported_version == 0) legacy_version else supported_version;
switch (tls_version) {
@enumToInt(ProtocolVersion.tls_1_2) => {
@ -445,28 +511,44 @@ pub fn init(tls: *Tls, stream: net.Stream, host: []const u8) !void {
}
const shared_key = crypto.dh.X25519.scalarmult(
tls.x25519_priv_key,
tls.x25519_server_pub_key,
x25519_priv_key,
x25519_server_pub_key.*,
) catch return error.TlsDecryptFailure;
switch (cipher_suite) {
.TLS_AES_128_GCM_SHA256 => {
const AEAD = crypto.aead.aes_gcm.Aes128Gcm;
const Hash = crypto.hash.sha2.Sha256;
const Hmac = crypto.auth.hmac.Hmac(Hash);
const Hkdf = crypto.kdf.hkdf.Hkdf(Hmac);
const hello_hash = helloHash(client_hello_bytes1, host, frag, Hash);
const early_secret = Hkdf.extract(&[1]u8{0}, &([1]u8{0} ** Hash.digest_length));
const empty_hash = emptyHash(Hash);
const derived_secret = hkdfExpandLabel(Hkdf, early_secret, "derived", &empty_hash, Hash.digest_length);
const handshake_secret = Hkdf.extract(&derived_secret, &shared_key);
const client_secret = hkdfExpandLabel(Hkdf, handshake_secret, "c hs traffic", &hello_hash, Hash.digest_length);
const server_secret = hkdfExpandLabel(Hkdf, handshake_secret, "s hs traffic", &hello_hash, Hash.digest_length);
client_handshake_key[0..AEAD.key_length].* = hkdfExpandLabel(Hkdf, client_secret, "key", "", AEAD.key_length);
server_handshake_key[0..AEAD.key_length].* = hkdfExpandLabel(Hkdf, server_secret, "key", "", AEAD.key_length);
client_handshake_iv = hkdfExpandLabel(Hkdf, client_secret, "iv", "", AEAD.nonce_length);
server_handshake_iv = hkdfExpandLabel(Hkdf, server_secret, "iv", "", AEAD.nonce_length);
switch (cipher_suite_tag) {
inline .TLS_AES_128_GCM_SHA256, .TLS_AES_256_GCM_SHA384 => |tag| {
const P = std.meta.TagPayload(CipherParams, tag);
cipher_params = @unionInit(CipherParams, @tagName(tag), .{
.handshake_secret = undefined,
.master_secret = undefined,
.client_handshake_key = undefined,
.server_handshake_key = undefined,
.client_finished_key = undefined,
.server_finished_key = undefined,
.client_handshake_iv = undefined,
.server_handshake_iv = undefined,
.transcript_hash = P.Hash.init(.{}),
});
const p = &@field(cipher_params, @tagName(tag));
p.transcript_hash.update(client_hello_bytes1); // Client Hello part 1
p.transcript_hash.update(host); // Client Hello part 2
p.transcript_hash.update(frag); // Server Hello
const hello_hash = p.transcript_hash.peek();
const zeroes = [1]u8{0} ** P.Hash.digest_length;
const early_secret = P.Hkdf.extract(&[1]u8{0}, &zeroes);
const empty_hash = emptyHash(P.Hash);
const hs_derived_secret = hkdfExpandLabel(P.Hkdf, early_secret, "derived", &empty_hash, P.Hash.digest_length);
p.handshake_secret = P.Hkdf.extract(&hs_derived_secret, &shared_key);
const ap_derived_secret = hkdfExpandLabel(P.Hkdf, p.handshake_secret, "derived", &empty_hash, P.Hash.digest_length);
p.master_secret = P.Hkdf.extract(&ap_derived_secret, &zeroes);
const client_secret = hkdfExpandLabel(P.Hkdf, p.handshake_secret, "c hs traffic", &hello_hash, P.Hash.digest_length);
const server_secret = hkdfExpandLabel(P.Hkdf, p.handshake_secret, "s hs traffic", &hello_hash, P.Hash.digest_length);
p.client_finished_key = hkdfExpandLabel(P.Hkdf, client_secret, "finished", "", P.Hmac.key_length);
p.server_finished_key = hkdfExpandLabel(P.Hkdf, server_secret, "finished", "", P.Hmac.key_length);
p.client_handshake_key = hkdfExpandLabel(P.Hkdf, client_secret, "key", "", P.AEAD.key_length);
p.server_handshake_key = hkdfExpandLabel(P.Hkdf, server_secret, "key", "", P.AEAD.key_length);
p.client_handshake_iv = hkdfExpandLabel(P.Hkdf, client_secret, "iv", "", P.AEAD.nonce_length);
p.server_handshake_iv = hkdfExpandLabel(P.Hkdf, server_secret, "iv", "", P.AEAD.nonce_length);
//std.debug.print("shared_key: {}\nhello_hash: {}\nearly_secret: {}\nempty_hash: {}\nderived_secret: {}\nhandshake_secret: {}\n client_secret: {}\n server_secret: {}\n", .{
// std.fmt.fmtSliceHexLower(&shared_key),
// std.fmt.fmtSliceHexLower(&hello_hash),
@ -478,24 +560,6 @@ pub fn init(tls: *Tls, stream: net.Stream, host: []const u8) !void {
// std.fmt.fmtSliceHexLower(&server_secret),
//});
},
.TLS_AES_256_GCM_SHA384 => {
const AEAD = crypto.aead.aes_gcm.Aes256Gcm;
const Hash = crypto.hash.sha2.Sha384;
const Hmac = crypto.auth.hmac.Hmac(Hash);
const Hkdf = crypto.kdf.hkdf.Hkdf(Hmac);
const hello_hash = helloHash(client_hello_bytes1, host, frag, Hash);
const early_secret = Hkdf.extract(&[1]u8{0}, &([1]u8{0} ** Hash.digest_length));
const empty_hash = emptyHash(Hash);
const derived_secret = hkdfExpandLabel(Hkdf, early_secret, "derived", &empty_hash, Hash.digest_length);
const handshake_secret = Hkdf.extract(&derived_secret, &shared_key);
const client_secret = hkdfExpandLabel(Hkdf, handshake_secret, "c hs traffic", &hello_hash, Hash.digest_length);
const server_secret = hkdfExpandLabel(Hkdf, handshake_secret, "s hs traffic", &hello_hash, Hash.digest_length);
client_handshake_key = hkdfExpandLabel(Hkdf, client_secret, "key", "", AEAD.key_length);
server_handshake_key = hkdfExpandLabel(Hkdf, server_secret, "key", "", AEAD.key_length);
client_handshake_iv = hkdfExpandLabel(Hkdf, client_secret, "iv", "", AEAD.nonce_length);
server_handshake_iv = hkdfExpandLabel(Hkdf, server_secret, "iv", "", AEAD.nonce_length);
},
.TLS_CHACHA20_POLY1305_SHA256 => {
@panic("TODO");
},
@ -541,50 +605,24 @@ pub fn init(tls: *Tls, stream: net.Stream, host: []const u8) !void {
},
.application_data => {
var cleartext_buf: [1000]u8 = undefined;
const cleartext = switch (cipher_suite) {
.TLS_AES_128_GCM_SHA256 => c: {
const AEAD = crypto.aead.aes_gcm.Aes128Gcm;
const ciphertext_len = record_size - AEAD.tag_length;
const cleartext = switch (cipher_params) {
inline .TLS_AES_128_GCM_SHA256, .TLS_AES_256_GCM_SHA384 => |*p| c: {
const P = @TypeOf(p.*);
const ciphertext_len = record_size - P.AEAD.tag_length;
const ciphertext = handshake_buf[i..][0..ciphertext_len];
i += ciphertext.len;
if (ciphertext.len > cleartext_buf.len) return error.TlsRecordOverflow;
const cleartext = cleartext_buf[0..ciphertext.len];
const auth_tag = handshake_buf[i..][0..AEAD.tag_length].*;
const V = @Vector(AEAD.nonce_length, u8);
const pad = [1]u8{0} ** (AEAD.nonce_length - 8);
const auth_tag = handshake_buf[i..][0..P.AEAD.tag_length].*;
const V = @Vector(P.AEAD.nonce_length, u8);
const pad = [1]u8{0} ** (P.AEAD.nonce_length - 8);
const operand: V = pad ++ @bitCast([8]u8, big(read_seq));
read_seq += 1;
const nonce: [AEAD.nonce_length]u8 = @as(V, server_handshake_iv) ^ operand;
//std.debug.print("seq: {d} nonce: {} operand: {}\n", .{
// read_seq - 1,
// std.fmt.fmtSliceHexLower(&nonce),
// std.fmt.fmtSliceHexLower(&@as([12]u8, operand)),
//});
const nonce: [P.AEAD.nonce_length]u8 = @as(V, p.server_handshake_iv) ^ operand;
const ad = handshake_buf[end_hdr - 5 ..][0..5];
const key = server_handshake_key[0..AEAD.key_length].*;
AEAD.decrypt(cleartext, ciphertext, auth_tag, ad, nonce, key) catch
P.AEAD.decrypt(cleartext, ciphertext, auth_tag, ad, nonce, p.server_handshake_key) catch
return error.TlsBadRecordMac;
break :c cleartext;
},
.TLS_AES_256_GCM_SHA384 => c: {
const AEAD = crypto.aead.aes_gcm.Aes256Gcm;
const ciphertext_len = record_size - AEAD.tag_length;
const ciphertext = handshake_buf[i..][0..ciphertext_len];
i += ciphertext.len;
if (ciphertext.len > cleartext_buf.len) return error.TlsRecordOverflow;
const cleartext = cleartext_buf[0..ciphertext.len];
const auth_tag = handshake_buf[i..][0..AEAD.tag_length].*;
const V = @Vector(AEAD.nonce_length, u8);
const pad = [1]u8{0} ** (AEAD.nonce_length - 8);
const operand: V = pad ++ @bitCast([8]u8, big(read_seq));
read_seq += 1;
const nonce: [AEAD.nonce_length]u8 = @as(V, server_handshake_iv) ^ operand;
const ad = handshake_buf[end_hdr - 5 ..][0..5];
const key = server_handshake_key[0..AEAD.key_length].*;
AEAD.decrypt(cleartext, ciphertext, auth_tag, ad, nonce, key) catch
return error.TlsBadRecordMac;
p.transcript_hash.update(cleartext[0 .. cleartext.len - 1]);
break :c cleartext;
},
.TLS_CHACHA20_POLY1305_SHA256 => {
@ -611,6 +649,86 @@ pub fn init(tls: *Tls, stream: net.Stream, host: []const u8) !void {
}
std.debug.print("empty encrypted extensions\n", .{});
},
@enumToInt(HandshakeType.certificate) => {
std.debug.print("cool certificate bro\n", .{});
},
@enumToInt(HandshakeType.certificate_verify) => {
std.debug.print("the certificate came with a fancy signature\n", .{});
},
@enumToInt(HandshakeType.finished) => {
// This message is to trick buggy proxies into behaving correctly.
const client_change_cipher_spec_msg = [_]u8{
@enumToInt(ContentType.change_cipher_spec),
0x03, 0x03, // legacy protocol version
0x00, 0x01, // length
0x01,
};
const app_cipher = switch (cipher_params) {
inline .TLS_AES_128_GCM_SHA256, .TLS_AES_256_GCM_SHA384 => |*p, tag| c: {
const P = @TypeOf(p.*);
// TODO verify the server's data
const handshake_hash = p.transcript_hash.finalResult();
const verify_data = hmac(P.Hmac, &handshake_hash, p.client_finished_key);
const out_cleartext = [_]u8{
@enumToInt(HandshakeType.finished),
0, 0, verify_data.len + 1 + P.AEAD.tag_length, // length
} ++ verify_data ++ [1]u8{@enumToInt(ContentType.handshake)};
const wrapped_len = out_cleartext.len + P.AEAD.tag_length;
var finished_msg = [_]u8{
@enumToInt(ContentType.application_data),
0x03, 0x03, // legacy protocol version
0, wrapped_len, // byte length of encrypted record
} ++ ([1]u8{undefined} ** wrapped_len);
const ad = finished_msg[0..5];
const ciphertext = finished_msg[5..][0..out_cleartext.len];
const auth_tag = finished_msg[finished_msg.len - P.AEAD.tag_length ..];
const nonce = p.client_handshake_iv;
P.AEAD.encrypt(ciphertext, auth_tag, &out_cleartext, ad, nonce, p.client_handshake_key);
{
var iovecs = [_]std.os.iovec_const{
.{
.iov_base = &client_change_cipher_spec_msg,
.iov_len = client_change_cipher_spec_msg.len,
},
.{
.iov_base = &finished_msg,
.iov_len = finished_msg.len,
},
};
try stream.writevAll(&iovecs);
}
const client_secret = hkdfExpandLabel(P.Hkdf, p.master_secret, "c ap traffic", &handshake_hash, P.Hash.digest_length);
const server_secret = hkdfExpandLabel(P.Hkdf, p.master_secret, "s ap traffic", &handshake_hash, P.Hash.digest_length);
break :c @unionInit(ApplicationCipher, @tagName(tag), .{
.client_key = hkdfExpandLabel(P.Hkdf, client_secret, "key", "", P.AEAD.key_length),
.server_key = hkdfExpandLabel(P.Hkdf, server_secret, "key", "", P.AEAD.key_length),
.client_iv = hkdfExpandLabel(P.Hkdf, client_secret, "iv", "", P.AEAD.nonce_length),
.server_iv = hkdfExpandLabel(P.Hkdf, server_secret, "iv", "", P.AEAD.nonce_length),
});
},
.TLS_CHACHA20_POLY1305_SHA256 => {
@panic("TODO");
},
.TLS_AES_128_CCM_SHA256 => {
@panic("TODO");
},
.TLS_AES_128_CCM_8_SHA256 => {
@panic("TODO");
},
};
return .{
.application_cipher = app_cipher,
.read_seq = read_seq,
.write_seq = 1,
.partially_read_buffer = undefined,
.partially_read_len = 0,
};
},
else => {
std.debug.print("handshake type: {d}\n", .{cleartext[0]});
return error.TlsUnexpectedMessage;
@ -631,14 +749,185 @@ pub fn init(tls: *Tls, stream: net.Stream, host: []const u8) !void {
i = end;
}
tls.state = .sent_hello;
return error.TlsHandshakeFailure;
}
pub fn writeAll(tls: *Tls, stream: net.Stream, buffer: []const u8) !void {
_ = tls;
_ = stream;
_ = buffer;
@panic("hold on a minute, we didn't finish implementing the handshake yet");
pub fn write(tls: *Tls, stream: net.Stream, bytes: []const u8) !usize {
var ciphertext_buf: [max_ciphertext_len * 4]u8 = undefined;
var iovecs_buf: [5]std.os.iovec_const = undefined;
var ciphertext_end: usize = 0;
var iovec_end: usize = 0;
var bytes_i: usize = 0;
switch (tls.application_cipher) {
inline .TLS_AES_128_GCM_SHA256, .TLS_AES_256_GCM_SHA384 => |*p| {
const P = @TypeOf(p.*);
const V = @Vector(P.AEAD.nonce_length, u8);
while (true) {
const ciphertext_len = @intCast(u16, @min(
@min(bytes.len - bytes_i, max_ciphertext_len),
ciphertext_buf.len - 5 - P.AEAD.tag_length - ciphertext_end,
));
if (ciphertext_len == 0) return bytes_i;
const wrapped_len = ciphertext_len + P.AEAD.tag_length;
const record = ciphertext_buf[ciphertext_end..][0 .. 5 + wrapped_len];
const ad = record[0..5];
ciphertext_end += 5;
const ciphertext = ciphertext_buf[ciphertext_end..][0..ciphertext_len];
ciphertext_end += ciphertext_len;
const auth_tag = ciphertext_buf[ciphertext_end..][0..P.AEAD.tag_length];
ciphertext_end += P.AEAD.tag_length;
const pad = [1]u8{0} ** (P.AEAD.nonce_length - 8);
const operand: V = pad ++ @bitCast([8]u8, big(tls.write_seq));
tls.write_seq += 1;
const nonce: [P.AEAD.nonce_length]u8 = @as(V, p.client_iv) ^ operand;
ad.* =
[_]u8{@enumToInt(ContentType.application_data)} ++
int2(@enumToInt(ProtocolVersion.tls_1_2)) ++
int2(wrapped_len);
const cleartext = bytes[bytes_i..ciphertext.len];
P.AEAD.encrypt(ciphertext, auth_tag, cleartext, ad, nonce, p.client_key);
iovecs_buf[iovec_end] = .{
.iov_base = record.ptr,
.iov_len = record.len,
};
iovec_end += 1;
bytes_i += ciphertext_len;
}
},
.TLS_CHACHA20_POLY1305_SHA256 => {
@panic("TODO");
},
.TLS_AES_128_CCM_SHA256 => {
@panic("TODO");
},
.TLS_AES_128_CCM_8_SHA256 => {
@panic("TODO");
},
}
// Ideally we would call writev exactly once here, however, we must ensure
// that we don't return with a record partially written.
var i: usize = 0;
var total_amt: usize = 0;
while (true) {
var amt = try stream.writev(iovecs_buf[i..iovec_end]);
total_amt += amt;
while (amt >= iovecs_buf[i].iov_len) {
amt -= iovecs_buf[i].iov_len;
i += 1;
// Rely on the property that iovecs delineate records, meaning that
// if amt equals zero here, we have fortunately found ourselves
// with a short read that aligns at the record boundary.
if (i >= iovec_end or amt == 0) return total_amt;
}
iovecs_buf[i].iov_base += amt;
iovecs_buf[i].iov_len -= amt;
}
}
pub fn writeAll(tls: *Tls, stream: net.Stream, bytes: []const u8) !void {
var index: usize = 0;
while (index < bytes.len) {
index += try tls.write(stream, bytes[index..]);
}
}
/// Returns number of bytes that have been read, which are now populated inside
/// `buffer`. A return value of zero bytes does not necessarily mean end of
/// stream.
pub fn read(tls: *Tls, stream: net.Stream, buffer: []u8) !usize {
const prev_len = tls.partially_read_len;
var in_buf: [max_ciphertext_len * 4]u8 = undefined;
mem.copy(u8, &in_buf, tls.partially_read_buffer[0..prev_len]);
// Capacity of output buffer, in records, rounded up.
const buf_cap = (buffer.len +| (max_ciphertext_len - 1)) / max_ciphertext_len;
const wanted_read_len = buf_cap * (max_ciphertext_len + ciphertext_record_header_len);
const actual_read_len = try stream.read(in_buf[prev_len..@min(wanted_read_len, in_buf.len)]);
const frag = in_buf[0 .. prev_len + actual_read_len];
var in: usize = 0;
var out: usize = 0;
while (true) {
if (in + ciphertext_record_header_len > frag.len) {
return finishRead(tls, frag, in, out);
}
const ct = @intToEnum(ContentType, frag[in]);
in += 1;
const legacy_version = mem.readIntBig(u16, frag[in..][0..2]);
in += 2;
_ = legacy_version;
const record_size = mem.readIntBig(u16, frag[in..][0..2]);
in += 2;
const end = in + record_size;
if (end > frag.len) {
if (record_size > max_ciphertext_len) return error.TlsRecordOverflow;
return finishRead(tls, frag, in, out);
}
switch (ct) {
.alert => {
@panic("TODO handle an alert here");
},
.application_data => {
const cleartext_len = switch (tls.application_cipher) {
inline .TLS_AES_128_GCM_SHA256, .TLS_AES_256_GCM_SHA384 => |*p| c: {
const P = @TypeOf(p.*);
const V = @Vector(P.AEAD.nonce_length, u8);
const ciphertext_len = record_size - P.AEAD.tag_length;
const ciphertext = frag[in..][0..ciphertext_len];
in += ciphertext_len;
const auth_tag = frag[in..][0..P.AEAD.tag_length].*;
const cleartext = buffer[out..][0..ciphertext_len];
const pad = [1]u8{0} ** (P.AEAD.nonce_length - 8);
const operand: V = pad ++ @bitCast([8]u8, big(tls.read_seq));
tls.read_seq += 1;
const nonce: [P.AEAD.nonce_length]u8 = @as(V, p.server_iv) ^ operand;
const ad = frag[0..ciphertext_record_header_len];
P.AEAD.decrypt(cleartext, ciphertext, auth_tag, ad, nonce, p.server_key) catch
return error.TlsBadRecordMac;
break :c cleartext.len;
},
.TLS_CHACHA20_POLY1305_SHA256 => {
@panic("TODO");
},
.TLS_AES_128_CCM_SHA256 => {
@panic("TODO");
},
.TLS_AES_128_CCM_8_SHA256 => {
@panic("TODO");
},
};
const inner_ct = buffer[out + cleartext_len - 1];
switch (inner_ct) {
@enumToInt(ContentType.handshake) => {
std.debug.print("the server wants to keep shaking hands\n", .{});
},
@enumToInt(ContentType.application_data) => {
out += cleartext_len - 1;
},
else => {
return error.TlsUnexpectedMessage;
},
}
},
else => {
return error.TlsUnexpectedMessage;
},
}
in = end;
}
}
fn finishRead(tls: *Tls, frag: []const u8, in: usize, out: usize) usize {
const saved_buf = frag[in..];
mem.copy(u8, &tls.partially_read_buffer, saved_buf);
tls.partially_read_len = @intCast(u15, saved_buf.len);
return out;
}
fn hkdfExpandLabel(
@ -674,13 +963,9 @@ fn emptyHash(comptime Hash: type) [Hash.digest_length]u8 {
return result;
}
fn helloHash(s0: []const u8, s1: []const u8, s2: []const u8, comptime Hash: type) [Hash.digest_length]u8 {
var h = Hash.init(.{});
h.update(s0);
h.update(s1);
h.update(s2);
var result: [Hash.digest_length]u8 = undefined;
h.final(&result);
fn hmac(comptime Hmac: type, message: []const u8, key: [Hmac.key_length]u8) [Hmac.mac_length]u8 {
var result: [Hmac.mac_length]u8 = undefined;
Hmac.create(&result, message, &key);
return result;
}
@ -693,3 +978,10 @@ inline fn big(x: anytype) @TypeOf(x) {
.Little => @byteSwap(x),
};
}
inline fn int2(x: u16) [2]u8 {
return .{
@truncate(u8, x >> 8),
@truncate(u8, x),
};
}

22
lib/std/crypto/sha2.zig
View File

@ -142,6 +142,11 @@ fn Sha2x32(comptime params: Sha2Params32) type {
d.total_len += b.len;
}
pub fn peek(d: Self) [digest_length]u8 {
var copy = d;
return copy.finalResult();
}
pub fn final(d: *Self, out: *[digest_length]u8) void {
// The buffer here will never be completely full.
mem.set(u8, d.buf[d.buf_len..], 0);
@ -175,6 +180,12 @@ fn Sha2x32(comptime params: Sha2Params32) type {
}
}
pub fn finalResult(d: *Self) [digest_length]u8 {
var result: [digest_length]u8 = undefined;
d.final(&result);
return result;
}
const W = [64]u32{
0x428A2F98, 0x71374491, 0xB5C0FBCF, 0xE9B5DBA5, 0x3956C25B, 0x59F111F1, 0x923F82A4, 0xAB1C5ED5,
0xD807AA98, 0x12835B01, 0x243185BE, 0x550C7DC3, 0x72BE5D74, 0x80DEB1FE, 0x9BDC06A7, 0xC19BF174,
@ -621,6 +632,11 @@ fn Sha2x64(comptime params: Sha2Params64) type {
d.total_len += b.len;
}
pub fn peek(d: Self) [digest_length]u8 {
var copy = d;
return copy.finalResult();
}
pub fn final(d: *Self, out: *[digest_length]u8) void {
// The buffer here will never be completely full.
mem.set(u8, d.buf[d.buf_len..], 0);
@ -654,6 +670,12 @@ fn Sha2x64(comptime params: Sha2Params64) type {
}
}
pub fn finalResult(d: *Self) [digest_length]u8 {
var result: [digest_length]u8 = undefined;
d.final(&result);
return result;
}
fn round(d: *Self, b: *const [128]u8) void {
var s: [80]u64 = undefined;

12
lib/std/http/Client.zig
View File

@ -12,7 +12,7 @@ pub const Request = struct {
client: *Client,
stream: net.Stream,
headers: std.ArrayListUnmanaged(u8) = .{},
tls: std.crypto.Tls = .{},
tls: std.crypto.Tls,
protocol: Protocol,
pub const Protocol = enum { http, https };
@ -55,6 +55,13 @@ pub const Request = struct {
},
}
}
pub fn read(req: *Request, buffer: []u8) !usize {
switch (req.protocol) {
.http => return req.stream.read(buffer),
.https => return req.tls.read(req.stream, buffer),
}
}
};
pub fn deinit(client: *Client) void {
@ -68,6 +75,7 @@ pub fn request(client: *Client, options: Request.Options) !Request {
.client = client,
.stream = try net.tcpConnectToHost(client.allocator, options.host, options.port),
.protocol = options.protocol,
.tls = undefined,
};
client.active_requests += 1;
errdefer req.deinit();
@ -75,7 +83,7 @@ pub fn request(client: *Client, options: Request.Options) !Request {
switch (options.protocol) {
.http => {},
.https => {
try req.tls.init(req.stream, options.host);
req.tls = try std.crypto.Tls.init(req.stream, options.host);
},
}