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main.c
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828 lines (748 loc) · 30.6 KB
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#ifdef _WIN32
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
#include <WinSock2.h>
#include <Ws2tcpip.h>
typedef SOCKET platform_socket;
#define GET_SOCKET_ERROR() WSAGetLastError()
#define SOCKFD_CLOSE(sock) closesocket(sock)
#define SOCKFD_INVALID INVALID_SOCKET
#define SOCKFD_IS_INVALID(sock) ((sock) == INVALID_SOCKET)
#define SOCKET_CLEANUP() WSACleanup()
#else
#ifndef _POSIX_C_SOURCE
#define _POSIX_C_SOURCE 200112L
#endif
#include <arpa/inet.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <unistd.h>
#include <errno.h>
typedef int platform_socket;
#define GET_SOCKET_ERROR() errno
#define SOCKFD_CLOSE(sock) close(sock)
#define SOCKFD_INVALID (-1)
#define SOCKFD_IS_INVALID(sock) ((sock) < 0)
#define SOCKET_CLEANUP()
#endif
#ifdef _MSC_VER
#define compiler_ALWAYS_INLINE __forceinline
#elif defined(__clang__) || defined(__GNUC__)
#define compiler_ALWAYS_INLINE __attribute__((always_inline))
#else
#define compiler_ALWAYS_INLINE
#endif
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/rand.h>
#include <stdio.h>
#include <stdint.h>
#include <stddef.h>
#include <stdlib.h>
#include <limits.h>
#include <inttypes.h>
#define pkt_internal_VOID_(...) ((void)(__VA_ARGS__))
#define pkt_internal_NEXT_PTR_(p) (*((p)++))
#define pkt_internal_DEFINE_CAST_(Type) \
static inline compiler_ALWAYS_INLINE \
Type pkt_internal_impl_cast_##Type(Type x) { return x; }
pkt_internal_DEFINE_CAST_(uint8_t)
pkt_internal_DEFINE_CAST_(uint16_t)
pkt_internal_DEFINE_CAST_(uint32_t)
pkt_internal_DEFINE_CAST_(uint64_t)
static inline compiler_ALWAYS_INLINE
const uint8_t **pkt_internal_check_ppu8c_(const uint8_t **p) { return p; }
#define pkt_internal_PU8C_(pp) (*pkt_internal_check_ppu8c_(pp))
#define pkt_internal_CAST_(Type, x) (pkt_internal_impl_cast_##Type(x))
#define PKT_GETU8(pp) pkt_internal_CAST_(uint8_t, pkt_internal_NEXT_PTR_(pkt_internal_PU8C_(pp)))
#define PKT_GETU16(pp) pkt_internal_CAST_(uint16_t, ((uint16_t)PKT_GETU8(pp) << 8) + PKT_GETU8(pp))
static inline compiler_ALWAYS_INLINE
uint8_t **pkt_internal_check_ppu8_(uint8_t **p) { return p; }
#define pkt_internal_PU8_(pp) (*pkt_internal_check_ppu8_(pp))
#define PKT_internal_PUTOCTET_(pp, v) (pkt_internal_NEXT_PTR_(pkt_internal_PU8_(pp)) = ((v) & 0xFF))
#define PKT_internal_PUT2OCTET_(pp, v) (PKT_internal_PUTOCTET_(pp, v >> 8), PKT_internal_PUTOCTET_(pp, v))
#define PKT_PUTU8(pp, v) pkt_internal_VOID_(PKT_internal_PUTOCTET_(pp, pkt_internal_CAST_(uint8_t, v)))
#define PKT_PUTU16(pp, v) pkt_internal_VOID_(PKT_internal_PUT2OCTET_(pp, pkt_internal_CAST_(uint16_t, v)))
#define COUNT_OF(x) ((sizeof(x)/sizeof(0[x])) / ((size_t)(!(sizeof(x) % sizeof(0[x])))))
typedef struct tls_1_3_alps_cfg_st {
const uint8_t *proto; // the protocol ALPN string, e.g., { 'h', '2' }
uint8_t proto_len; // the protocol string length, e.g., 2 for h2
uint8_t _p0[7]; // padding
const uint8_t *settings;
size_t settings_len;
} TLS13_ALPS_CFG;
typedef struct tls_1_3_alps_add_arg_st {
size_t cfg_size;
TLS13_ALPS_CFG *cfgs;
} TLS13_ALPS_ADD_ARG;
typedef struct alps_store_st {
const uint8_t *data;
size_t len;
} ALPS_STORE;
/* returns true if the error is fatal (SSL_shutdown MUST NOT be called),
* false if shutdown is safe to attempt
*/
static inline
unsigned char handle_ossl_err(SSL *ssl, int *pres, const char *desc) {
int res = *pres;
int errc = SSL_get_error(ssl, res);
// TODO: make this more informative
fprintf(stderr, "Error code from %s: SSL error %d, return value %d\n", desc, errc, res);
*pres = errc;
if (errc == SSL_ERROR_SSL) {
ERR_print_errors_fp(stderr);
return 1;
}
else if (errc == SSL_ERROR_SYSCALL) {
fprintf(stderr, "SSL_ERROR_SYSCALL, socket error: %d\n", GET_SOCKET_ERROR());
return 1;
}
return 0;
}
static const size_t exdata_size_table[] = {
sizeof(ALPS_STORE),
#define EXDATA_ID_SSL_ALPSDATA 0
};
static int exdata_idx[COUNT_OF(exdata_size_table)];
static inline
void osslcb_exdata_new(
void *parent, void *ptr, CRYPTO_EX_DATA *ad,
int idx, long argl, void *argp
) {
void *store = calloc(1, exdata_size_table[argl]);
SSL_set_ex_data(parent, idx, store);
}
static inline
void osslcb_exdata_free(
void *parent, void *ptr, CRYPTO_EX_DATA *ad,
int idx, long argl, void *argp
) {
free(ptr);
}
static inline
int osslcb_exdata_dup(
CRYPTO_EX_DATA *to, const CRYPTO_EX_DATA *from,
void **from_d, int idx, long argl, void *argp
) {
void *store = malloc(exdata_size_table[argl]);
if (!store)
return 0;
memcpy(store, *from_d, exdata_size_table[argl]);
*from_d = store;
return 1;
}
FILE *sslkeylogfile = NULL;
unsigned char keylogfile_err = 0;
static inline
void osslcb_keylog_func(const SSL *ssl, const char *line) {
if (!sslkeylogfile) {
if (keylogfile_err) return;
const char *filename = getenv("SSLKEYLOGFILE");
if (!filename) {
keylogfile_err = 1;
return;
}
// append binary to avoid windows from automatically replacing \n with \r\n
sslkeylogfile = fopen(filename, "ab");
if (!sslkeylogfile) {
keylogfile_err = 1;
perror("fopen SSLKEYLOGFILE");
return;
}
fprintf(stderr, "Opened SSLKEYLOGFILE @ %s!\n", filename);
}
fputs(line, sslkeylogfile);
fputc('\n', sslkeylogfile);
fprintf(stderr, "SSLKEYLOG: %s\n", line);
}
#ifndef TLSEXT_TYPE_application_settings
#define TLSEXT_TYPE_application_settings 17613
#endif
#ifndef TLSEXT_TYPE_encrypted_client_hello
#define TLSEXT_TYPE_encrypted_client_hello 65037
#endif
static const unsigned char h2_alpn[2] = {'h', '2'};
static const unsigned char invalidh2_alpn[9] = {'h', 'I', 'N', 'V', 'A', 'L', 'I', 'D', '2'};
static inline
void x_SSL_get0_peer_application_settings(
const SSL *ssl,
const uint8_t **out_data,
size_t *out_len
) {
ALPS_STORE *palps_store = SSL_get_ex_data(ssl, exdata_idx[EXDATA_ID_SSL_ALPSDATA]);
if (!palps_store) {
*out_len = 0;
return;
} else {
*out_data = palps_store->data;
*out_len = palps_store->len;
}
}
static inline
int x_SSL_has_application_settings(const SSL *ssl) {
return !!SSL_get_ex_data(ssl, exdata_idx[EXDATA_ID_SSL_ALPSDATA]);
}
#ifndef SSL_EXT_TLS1_3_CLIENT_ENCRYPTED_EXTENSIONS
// We don't have this in OpenSSL yet
#define SSL_EXT_TLS1_3_CLIENT_ENCRYPTED_EXTENSIONS 0x00000
#endif
static inline
int osslcb_custom_ext_add_cb_ex(
SSL *s, unsigned int ext_type,
unsigned int context,
const unsigned char **out,
size_t *outlen, X509 *x,
size_t chainidx, int *al,
void *add_arg
) {
switch (ext_type)
{
case TLSEXT_TYPE_application_settings:;
const TLS13_ALPS_ADD_ARG *palps_add_arg = add_arg;
const size_t alps_cfgs_size = palps_add_arg->cfg_size;
const TLS13_ALPS_CFG *alps_cfgs = palps_add_arg->cfgs;
if (context & SSL_EXT_CLIENT_HELLO) {
unsigned char *ptr;
uint16_t msg_size;
{
size_t supported_protos_size = alps_cfgs_size;
for (size_t i = 0; i < alps_cfgs_size; ++i)
supported_protos_size += alps_cfgs[i].proto_len;
if (supported_protos_size > UINT16_MAX) {
fprintf(stderr, "Supported Protocols too large\n");
return *al = SSL_AD_INTERNAL_ERROR, -1;
}
msg_size = (uint16_t)supported_protos_size;
*out = ptr = (unsigned char *)malloc(*outlen = supported_protos_size + 2);
if (!ptr) {
fprintf(stderr, "malloc failure\n");
return *al = SSL_AD_INTERNAL_ERROR, -1;
}
}
PKT_PUTU16(&ptr, msg_size); // payload len
for (size_t i = 0; i < alps_cfgs_size; ++i) {
const TLS13_ALPS_CFG *current_cfg = alps_cfgs + i;
PKT_PUTU8(&ptr, (uint8_t)current_cfg->proto_len);
memcpy(ptr, current_cfg->proto, current_cfg->proto_len);
ptr += current_cfg->proto_len;
}
#ifndef NDEBUG
if (ptr - *out - *outlen != 0) {
fprintf(stderr, "Error serialising ALPS-CH: allocated %zu, used %zu\n", *outlen, ptr - *out);
free((unsigned char *)*out);
return *al = SSL_AD_INTERNAL_ERROR, -1;
}
#endif // NDEBUG
return 1;
}
else if (context & SSL_EXT_TLS1_3_CLIENT_ENCRYPTED_EXTENSIONS) {
const unsigned char *alpn_data;
unsigned int alpn_data_len;
SSL_get0_alpn_selected(s, &alpn_data, &alpn_data_len);
if (alpn_data == NULL) // no protocol has been selected
return *al = SSL_AD_ILLEGAL_PARAMETER, -1;
const TLS13_ALPS_CFG *alps_cfgs_end = alps_cfgs + alps_cfgs_size;
while (alps_cfgs++ != alps_cfgs_end)
if (alps_cfgs->proto_len == alpn_data_len && !memcmp(alps_cfgs->proto, alpn_data, alpn_data_len)) {
unsigned char *ptr = malloc(*outlen = alps_cfgs->settings_len);
*out = ptr;
if (!ptr) {
fprintf(stderr, "malloc failure\n");
return *al = SSL_AD_INTERNAL_ERROR, -1;
}
memcpy(ptr, alps_cfgs->settings, alps_cfgs->settings_len);
return 1;
}
// The server sends an ALPS, although the ALPN selected is not in our advertised ApplicationSettingsSupport
return *al = SSL_AD_ILLEGAL_PARAMETER, -1;
}
else return *al = SSL_AD_INTERNAL_ERROR, -1;
case TLSEXT_TYPE_encrypted_client_hello:;
const uint16_t n_enc = 32; // precondition: n_enc
const uint16_t n_tag = 16;
const uint8_t maximum_name_length = 255; // ECHConfig.maximum_name_length
unsigned char extlen_and_cfg_id[2];
if (RAND_bytes(extlen_and_cfg_id, 2) != 1) {
fprintf(stderr, "RAND_bytes failed: %s\n", ERR_error_string(ERR_get_error(), NULL));
return *al = SSL_AD_INTERNAL_ERROR, -1;
}
// 105 is the minimum CH, plus 32 for some misc extensions, and a random 0~31 length for some other extensions
const uint16_t ich_snipadded_len = 105 + 32 + (extlen_and_cfg_id[0] & 31) + maximum_name_length + 9;
const uint16_t payld_size = ich_snipadded_len + 31 - ((ich_snipadded_len - 1) % 32) + n_tag;
unsigned char *ptr = malloc(*outlen = 10 + n_enc + payld_size);
*out = ptr;
if (ptr == NULL) {
fprintf(stderr, "malloc failure\n");
return *al = SSL_AD_INTERNAL_ERROR, -1;
}
/*
enum { outer(0), inner(1) } ECHClientHelloType;
struct {
ECHClientHelloType type;
select (ECHClientHello.type) {
case outer:
HpkeSymmetricCipherSuite cipher_suite;
uint8 config_id;
opaque enc<0..2^16-1>;
opaque payload<1..2^16-1>;
case inner:
Empty;
};
} ECHClientHello;
*/
PKT_PUTU8(&ptr, 0x00); // outer
PKT_PUTU16(&ptr, 0x0001); // cipher_suite.kdf_id = HKDF_SHA256
PKT_PUTU16(&ptr, 0x0001); // cipher_suite.aead_id = AES_128_GCM
PKT_PUTU8(&ptr, extlen_and_cfg_id[1]); // config_id
PKT_PUTU16(&ptr, n_enc); // enc len
if (RAND_bytes(ptr, n_enc) != 1) { // enc
fprintf(stderr, "RAND_bytes failed: %s\n", ERR_error_string(ERR_get_error(), NULL));
free((unsigned char *)*out);
return *al = SSL_AD_INTERNAL_ERROR, -1;
}
ptr += n_enc;
PKT_PUTU16(&ptr, payld_size); // payload len
if (RAND_bytes(ptr, payld_size) != 1) { // payload
fprintf(stderr, "RAND_bytes failed: %s\n", ERR_error_string(ERR_get_error(), NULL));
free((unsigned char *)*out);
return *al = SSL_AD_INTERNAL_ERROR, -1;
}
#ifndef NDEBUG
if (ptr - *out + payld_size - *outlen != 0) {
fprintf(stderr, "Error serialising ECH: expected ech_size %zu, got %zu\n", *outlen, ptr - *out + payld_size);
free((unsigned char *)*out);
return *al = SSL_AD_INTERNAL_ERROR, -1;
}
#endif
// fallthrough magic comment
// fall through
case 0x0a0a:; // GREASE
return 1;
default:
72A1
;
return *al = SSL_AD_INTERNAL_ERROR, -1;
}
}
static inline
void osslcb_custom_ext_free_cb_ex(
SSL *s, unsigned int ext_type,
unsigned int context,
const unsigned char *out,
void *add_arg
) {
switch (ext_type)
{
case TLSEXT_TYPE_application_settings:;
// fallthrough magic comment
// fall through
case TLSEXT_TYPE_encrypted_client_hello:;
free((unsigned char *)out);
// fallthrough magic comment
// fall through
case 0x0a0a:;
// fallthrough magic comment
// fall through
default:;
return;
}
}
static inline
int osslcb_custom_ext_parse_cb_ex(
SSL *s, unsigned int ext_type,
unsigned int context,
const unsigned char *in,
size_t inlen, X509 *x,
size_t chainidx, int *al,
void *parse_arg
) {
switch (ext_type)
{
case 0x0a0a:; // GREASE
return 1; // success
case TLSEXT_TYPE_encrypted_client_hello:;
// check the extension syntactically and abort the connection
// with a "decode_error" alert if it is invalid
if (context & SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST) {
// HRR
/**struct {
* opaque confirmation[8];
* } ECHHelloRetryRequest;
*/
if (inlen != 8)
return *al = SSL_AD_DECODE_ERROR, -1;
return 1;
}
else if (context & SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS) {
// Server EE
/**struct {
* ECHConfigList retry_configs;
* } ECHEncryptedExtensions;
* ECHConfig ECHConfigList<4..2^16-1>;
*/
// End of packet. Must not be dereferenced
const unsigned char *pend = in + inlen;
if (inlen < 2)
return *al = SSL_AD_DECODE_ERROR, -1;
uint16_t len_echcfg = PKT_GETU16(&in);
if (len_echcfg + sizeof(uint16_t) - inlen != 0)
return *al = SSL_AD_DECODE_ERROR, -1;
fprintf(stderr,
"Received ECH Server EncryptedExtensions, length %" PRIu16 "\n",
len_echcfg);
do {
/**struct {
* uint16 version;
* uint16 length;
* select (ECHConfig.version) {
* case 0xfe0d: ECHConfigContents contents;
* }
* } ECHConfig;
*/
if (pend - in < 4)
return *al = SSL_AD_DECODE_ERROR, -1;
uint16_t version = PKT_GETU16(&in);
uint16_t length = PKT_GETU16(&in);
fprintf(stderr,
"ECHConfig common: version %" PRIu16 ", length %" PRIu16 "\n",
version, length);
if (version == TLSEXT_TYPE_encrypted_client_hello) {
/**struct {
* HpkeKeyConfig key_config;
* uint8 maximum_name_length;
* opaque public_name<1..255>;
* ECHConfigExtension extensions<0..2^16-1>;
* } ECHConfigContents; // 17 bytes minimum
*/
if (pend - in < 17)
return *al = SSL_AD_DECODE_ERROR, -1;
/**struct {
* uint8 config_id;
* HpkeKemId kem_id;
* HpkePublicKey public_key;
* HpkeSymmetricCipherSuite cipher_suites<4..2^16-4>;
* } HpkeKeyConfig; // 12 bytes minimum
*
* opaque HpkePublicKey<1..2^16-1>;
* uint16 HpkeKemId; // Defined in RFC9180
* struct {
* HpkeKdfId kdf_id;
* HpkeAeadId aead_id;
* } HpkeSymmetricCipherSuite; // 4 bytes minimum
* uint16 HpkeKdfId; // Defined in RFC9180
* uint16 Hpke
9927
AeadId; // Defined in RFC9180
*/
uint8_t kcfg_config_id = PKT_GETU8(&in);
uint16_t kcfg_kem_id = PKT_GETU16(&in);
uint16_t kcfg_pubkey_len = PKT_GETU16(&in);
if (!kcfg_pubkey_len)
return *al = SSL_AD_DECODE_ERROR, -1;
in += kcfg_pubkey_len; // opaque pubkey
if (pend - in < 11)
return *al = SSL_AD_DECODE_ERROR, -1;
uint16_t kcfg_cs_len = PKT_GETU16(&in);
if (kcfg_cs_len & 3 || !kcfg_cs_len)
return *al = SSL_AD_DECODE_ERROR, -1;
in += kcfg_cs_len;
if (pend - in < 5)
return *al = SSL_AD_DECODE_ERROR, -1;
fprintf(stderr,
"ECHConfigContents.key_config = { .config_id=%" PRIu8 ", .kem_id=%" PRIu16
", .public_key=<%" PRIu16 " bytes opaque>, .cipher_suites=<%" PRIu16 " cipher suites> }\n",
kcfg_config_id, kcfg_kem_id, kcfg_pubkey_len, kcfg_cs_len >> 2);
uint8_t maximum_name_length = PKT_GETU8(&in);
uint8_t public_name_len = PKT_GETU8(&in);
if (!public_name_len) // 1..255
return *al = SSL_AD_DECODE_ERROR, -1;
in += public_name_len;
if (pend - in < 2)
return *al = SSL_AD_DECODE_ERROR, -1;
uint16_t extensions_len = PKT_GETU16(&in);
fprintf(stderr,
"ECHConfigContents: { .maximum_name_length=%" PRIu8 ", .public_name=<%" PRIu8 " bytes opaque>, .extensions=<%" PRIu16 " bytes> }\n",
maximum_name_length, public_name_len, extensions_len);
if (extensions_len) {
/**struct {
* ECHConfigExtensionType type;
* opaque data<0..2^16-1>;
* } ECHConfigExtension; // 4 bytes minimum
* uint16 ECHConfigExtensionType; // Defined in Section 11.3
*/
if (pend - in < 4)
return *al = SSL_AD_DECODE_ERROR, -1;
uint16_t echext_type = PKT_GETU16(&in);
uint16_t echext_data_len = PKT_GETU16(&in);
in += echext_data_len;
if (pend < in)
return *al = SSL_AD_DECODE_ERROR, -1;
fprintf(stderr,
"ECHConfigExtension: { .type=%" PRIu16 ", .data=<%" PRIu16 " bytes opaque> }\n",
echext_type, echext_data_len);
}
}
} while (in < pend);
if (in != pend)
return *al = SSL_AD_DECODE_ERROR, -1;
return 1;
}
else
return *al = SSL_AD_UNEXPECTED_MESSAGE, -1;
case TLSEXT_TYPE_application_settings:;
if (context & SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS) {
ALPS_STORE *palps_store = SSL_get_ex_data(s, exdata_idx[EXDATA_ID_SSL_ALPSDATA]);
palps_store->len = inlen;
palps_store->data = in;
fputs(
"WARNING: Server encrypted extensions received, "
"but we cannot send ours due to limitations of OpenSSL! "
"Try using an invalid ALPN for negotiation!\n", stderr);
return 1;
}
// fallthrough magic comment
// fall through
default:;
*al = SSL_AD_UNEXPECTED_MESSAGE;
return 0;
}
}
static inline
unsigned char x_SSLCTX_setup_imp(SSL_CTX *ssl_ctx, TLS13_ALPS_ADD_ARG *palps_add_arg, unsigned char *alpn, unsigned int alpn_size) {
unsigned char ret = 0;
if (!SSL_CTX_set_min_proto_version(ssl_ctx, TLS1_2_VERSION))
fputs("Warning: SSL_CTX_set_min_proto_version failed\n", stderr);
if (!SSL_CTX_set_max_proto_version(ssl_ctx, TLS1_3_VERSION))
fputs("Warning: SSL_CTX_set_max_proto_version failed\n", stderr);
// TLS 1.3 ciphersuites
if (!SSL_CTX_set_ciphersuites(ssl_ctx, "TLS_AES_128_GCM_SHA256:TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256"))
fputs("Warning: SSL_CTX_set_ciphersuites failed\n", stderr);
// TLS 1.2 and lower cipher list
if (!SSL_CTX_set_cipher_list(ssl_ctx, "TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256:TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256:TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384:TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384:TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256:TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256:TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA:TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA:TLS_RSA_WITH_AES_128_GCM_SHA256:TLS_RSA_WITH_AES_256_GCM_SHA384:TLS_RSA_WITH_AES_128_CBC_SHA:TLS_RSA_WITH_AES_256_CBC_SHA"))
fputs("Warning: SSL_CTX_set_cipher_list failed\n", stderr);
SSL_CTX_clear_options(ssl_ctx, SSL_OP_LEGACY_EC_POINT_FORMATS);
SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_ENCRYPT_THEN_MAC);
if (!SSL_CTX_set1_groups_list(ssl_ctx, "*X25519MLKEM768:*X25519:secp256r1:secp384r1"))
fputs("Warning: SSL_CTX_set1_groups_list failed\n", stderr);
if (!SSL_CTX_set1_sigalgs_list(ssl_ctx, "ecdsa_secp256r1_sha256:rsa_pss_rsae_sha256:rsa_pkcs1_sha256:ecdsa_secp384r1_sha384:rsa_pss_rsae_sha384:rsa_pkcs1_sha384:rsa_pss_rsae_sha512:rsa_pkcs1_sha512"))
fputs("Warning: SSL_CTX_set1_sigalgs_list failed\n", stderr);
// Requires OpenSSL to be built with brotli
int compression_algo = TLSEXT_comp_cert_brotli;
if (!SSL_CTX_set1_cert_comp_preference(ssl_ctx, &compression_algo, 1))
fputs("Warning: SSL_CTX_set1_cert_comp_preference failed\n", stderr);
if (!SSL_CTX_set_tlsext_status_type(ssl_ctx, TLSEXT_STATUSTYPE_ocsp))
fputs("Warning: SSL_CTX_set_tlsext_status_type failed\n", stderr);
/* SSL_CTX_set_alpn_protos returns 0 for success! */
if (SSL_CTX_set_alpn_protos(ssl_ctx, alpn, alpn_size))
fputs("Warning: SSL_CTX_set_alpn_protos failed\n", stderr);
if (!SSL_CTX_enable_ct(ssl_ctx, SSL_CT_VALIDATION_PERMISSIVE))
fputs("Warning: SSL_CTX_enable_ct failed\n", stderr);
// TODO: shuffle GREASE, ALPS, ECH
if (!SSL_CTX_add_custom_ext(
ssl_ctx, 0x0a0a,
SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_SERVER_HELLO | SSL_EXT_TLS_IMPLEMENTATION_ONLY | SSL_EXT_TLS1_3_ONLY,
osslcb_custom_ext_add_cb_ex, osslcb_custom_ext_free_cb_ex, NULL,
osslcb_custom_ext_parse_cb_ex, NULL))
fputs("Warning: SSL_CTX_add_custom_ext failed for GREASE(0a0a)\n", stderr);
if (!SSL_CTX_add_custom_ext(
ssl_ctx, TLSEXT_TYPE_application_settings,
SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS | SSL_EXT_TLS1_3_CLIENT_ENCRYPTED_EXTENSIONS | SSL_EXT_TLS_IMPLEMENTATION_ONLY | SSL_EXT_TLS1_3_ONLY,
osslcb_custom_ext_add_cb_ex, osslcb_custom_ext_free_cb_ex, palps_add_arg,
osslcb_custom_ext_parse_cb_ex, NULL))
fputs("Warning: SSL_CTX_add_custom_ext failed for ALPS\n", stderr);
if (!SSL_CTX_add_custom_ext(
ssl_ctx, TLSEXT_TYPE_encrypted_client_hello,
SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS | SSL_EXT_TLS_IMPLEMENTATION_ONLY | SSL_EXT_TLS1_3_ONLY,
osslcb_custom_ext_add_cb_ex, osslcb_custom_ext_free_cb_ex, NULL,
osslcb_custom_ext_parse_cb_ex, NULL))
fputs("Warning: SSL_CTX_add_custom_ext failed for ECH\n", stderr);
// General traffic fingerprint:
// Ciphersuites:
// missing GREASE 3a3a at the beginning
// Extensions:
// [DONE] missing GREASE 19018(4a4a), beginning
// supported_groups 10(a)
// - missing GREASE aaaa, beginning
// [DONE] missing ALPS 17613(44cd)
// - 0003026832
// key_share 51(33)
// - missing GREASE aaaa, beginning
// missing GREASE 6682(1a1a), end
//
// Implementation progress:
// GREASE: https://github.com/openssl/openssl/issues/9660
// Full ALPS is impossible, use a dummy ALPN
// ECH: https://github.com/openssl/openssl/tree/feature/ech
return ret;
}
#define REQUEST_VSN_MINOR "1"
#define REQUEST_HOSTNAME "tls.browserleaks.com"
#define REQUEST_PATH "/json"
// 200 on good fingerprint, 403 on bad
// #define REQUEST_HOSTNAME "mir24.tv"
// #define REQUEST_PATH "/news/16635210/dni-kultury-rossii-otkrylis-v-uzbekistane.-na-prazdnichnom-koncerte-vystupili-zvezdy-rossijskoj-estrada"
// #define REQUEST_HOSTNAME "cloudflare-ech.com"
// #define REQUEST_PATH "/"
int main(void) {
fputs("start\n", stderr);
exdata_idx[EXDATA_ID_SSL_ALPSDATA] = SSL_get_ex_new_index(
EXDATA_ID_SSL_ALPSDATA, NULL,
osslcb_exdata_new, osslcb_exdata_dup, osslcb_exdata_free);
const char hn[] = REQUEST_HOSTNAME;
const char httpreq[] =
"GET " REQUEST_PATH " HTTP/1." REQUEST_VSN_MINOR "\r\n"
"Host: " REQUEST_HOSTNAME "\r\n"
"Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7\r\n"
// "Accept-Encoding: gzip, deflate, br, zstd\r\n"
"Accept-Language: en-US,en;q=0.9\r\n"
"Cache-Control: no-cache\r\n"
"Connection: close\r\n"
"Pragma: no-cache\r\n"
"Priority: u=0, i\r\n"
"Referer: https://" REQUEST_HOSTNAME REQUEST_PATH "\r\n"
"Sec-Ch-Ua: \"Not;A=Brand\";v=\"99\", \"Google Chrome\";v=\"139\", \"Chromium\";v=\"139\"\r\n"
"Sec-Ch-Ua-Arch: \"x86\"\r\n"
"Sec-Ch-Ua-Full-Version-List: \"Not;A=Brand\";v=\"99.0.0.0\", \"Google Chrome\";v=\"139.0.7258.67\", \"Chromium\";v=\"139.0.7258.67\"\r\n"
"Sec-Ch-Ua-Mobile: ?0\r\n"
"Sec-Ch-Ua-Model: \"\"\r\n"
"Sec-Ch-Ua-Platform: \"Windows\"\r\n"
"Sec-Fetch-Dest: document\r\n"
"Sec-Fetch-Mode: navigate\r\n"
"Sec-Fetch-Site: same-origin\r\n"
"Sec-Fetch-User: ?1\r\n"
"Upgrade-Insecure-Requests: 1\r\n"
"User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/537.36\r\n"
"\r\n";
const int httpreq_size = sizeof(httpreq) - 1;
int ret = 2;
#ifdef _WIN32
{
WSADATA wsa;
int res = WSAStartup(MAKEWORD(2, 2), &wsa);
if (res != 0) {
fprintf(stderr, "WSAStartup failed with %d", res);
return 1;
}
}
#endif
platform_socket sock = SOCKFD_INVALID;
struct sockaddr_storage addr;
size_t addrlen;
{
struct addrinfo *ai_result;
int res = getaddrinfo(hn, "443", NULL, &ai_result);
if (res != 0) {
fprintf(stderr, "Error resolving hostname: %s(%#x)", gai_strerror(res), res);
ret = 1;
goto free_wsa;
}
if (ai_result == 0) {
fputs("Error resolving hostname: Unexpeced NULL ai_result", stderr);
ret = 1;
goto free_wsa;
}
for (struct addrinfo *it = ai_result; it != NULL; it = it->ai_next) {
sock = socket(it->ai_family, it->ai_socktype, it->ai_protocol);
if (SOCKFD_IS_INVALID(sock)) continue;
addrlen = it->ai_addrlen;
memcpy(&addr, it->ai_addr, addrlen);
break;
}
freeaddrinfo(ai_result);
}
if (SOCKFD_IS_INVALID(sock)) {
fputs("Failed to create a socket from getaddrinfo result\n", stderr);
ret = 1;
goto free_wsa;
}
SSL_CTX *ssl_ctx = SSL_CTX_new(TLS_client_method());
if (ssl_ctx == NULL) {
fputs("Error creating SSL_CTX object:\n", stderr);
ERR_print_errors_fp(stderr);
ret = 1;
goto free_sock;
}
// Configure SSL_CTX
SSL_CTX_set_keylog_callback(ssl_ctx, osslcb_keylog_func);
TLS13_ALPS_CFG h2cfg = {
.proto=invalidh2_alpn,
.proto_len=sizeof(invalidh2_alpn),
.settings=NULL,
.settings_len=0
};
TLS13_ALPS_ADD_ARG alps_add_arg = {
.cfg_size=1,
.cfgs=&h2cfg
};
unsigned char alpn[] = {
9, 'h', 'I', 'N', 'V', 'A', 'L', 'I', 'D', '2',
8, 'h', 't', 't', 'p', '/', '1', '.', *REQUEST_VSN_MINOR,
};
// do we need an abstraction over these three, e.g. ALPS_ADD_ARG, with .cfgs[X].settings == NULL meaning no ALPS?
(void)x_SSLCTX_setup_imp(ssl_ctx, &alps_add_arg, alpn, sizeof(alpn));
SSL *ssl = SSL_new(ssl_ctx);
if (ssl == NULL) {
fputs("Error creating SSL object:\n", stderr);
ERR_print_errors_fp(stderr);
ret = 1;
goto free_ssl_ctx;
}
if (!SSL_set_tlsext_host_name(ssl, hn))
fputs("Warning: SSL_set_tlsext_host_name failed\n", stderr);
if (!SSL_set_fd(ssl, (int)sock)) {
fputs("Error setting SSL fd:\n", stderr);
ERR_print_errors_fp(stderr);
ret = 1;
goto free_ssl;
}
if (addrlen > INT_MAX) {
fputs("Resolved address too long to connect\n", stderr);
ret = 1;
goto free_ssl;
}
int res = connect(sock, (const struct sockaddr *)&addr, (int)addrlen);
if (res != 0) {
fprintf(stderr, "connect failure: %d\n", GET_SOCKET_ERROR());
ret = 1;
goto free_ssl;
}
res = SSL_connect(ssl);
if (res <= 0) {
(void)handle_ossl_err(ssl, &res, "SSL_connect");
ret = 1;
goto free_ssl;
}
res = SSL_write(ssl, httpreq, httpreq_size);
if (res <= 0) {
ret = 1;
if (handle_ossl_err(ssl, &res, "SSL_write"))
goto free_ssl;
goto free_sslconn;
}
char buf[1024];
while (1) {
res = SSL_read(ssl, buf, sizeof(buf));
if (res > 0) {
fwrite(buf, 1, res, stdout);
} else {
putchar('\n');
if (handle_ossl_err(ssl, &res, "SSL_read")) {
ret = 1;
goto free_ssl;
}
ret = res != SSL_ERROR_ZERO_RETURN;
goto free_sslconn;
}
}
free_sslconn:;
SSL_shutdown(ssl);
free_ssl:;
SSL_free(ssl);
free_ssl_ctx:;
SSL_CTX_free(ssl_ctx);
free_sock:;
SOCKFD_CLOSE(sock);
free_wsa:;
SOCKET_CLEANUP();
return ret;
}