/* Copyright (c) 2014, Google Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
#include <openssl/base.h>
#include <string>
#include <vector>
#include <errno.h>
#include <limits.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#if !defined(OPENSSL_WINDOWS)
#include <arpa/inet.h>
#include <fcntl.h>
#include <netdb.h>
#include <netinet/in.h>
#include <sys/select.h>
#include <sys/socket.h>
#include <unistd.h>
#else
#include <io.h>
OPENSSL_MSVC_PRAGMA(warning(push, 3))
#include <winsock2.h>
#include <ws2tcpip.h>
OPENSSL_MSVC_PRAGMA(warning(pop))
typedef int ssize_t;
OPENSSL_MSVC_PRAGMA(comment(lib, "Ws2_32.lib"))
#endif
#include <openssl/err.h>
#include <openssl/ssl.h>
#include <openssl/x509.h>
#include "../crypto/internal.h"
#include "internal.h"
#include "transport_common.h"
#if !defined(OPENSSL_WINDOWS)
static int closesocket(int sock) {
return close(sock);
}
#endif
bool InitSocketLibrary() {
#if defined(OPENSSL_WINDOWS)
WSADATA wsaData;
int err = WSAStartup(MAKEWORD(2, 2), &wsaData);
if (err != 0) {
fprintf(stderr, "WSAStartup failed with error %d\n", err);
return false;
}
#endif
return true;
}
// Connect sets |*out_sock| to be a socket connected to the destination given
// in |hostname_and_port|, which should be of the form "www.example.com:123".
// It returns true on success and false otherwise.
bool Connect(int *out_sock, const std::string &hostname_and_port) {
size_t colon_offset = hostname_and_port.find_last_of(':');
const size_t bracket_offset = hostname_and_port.find_last_of(']');
std::string hostname, port;
// An IPv6 literal may have colons internally, guarded by square brackets.
if (bracket_offset != std::string::npos &&
colon_offset != std::string::npos && bracket_offset > colon_offset) {
colon_offset = std::string::npos;
}
if (colon_offset == std::string::npos) {
hostname = hostname_and_port;
port = "443";
} else {
hostname = hostname_and_port.substr(0, colon_offset);
port = hostname_and_port.substr(colon_offset + 1);
}
// Handle IPv6 literals.
if (hostname.size() >= 2 && hostname[0] == '[' &&
hostname[hostname.size() - 1] == ']') {
hostname = hostname.substr(1, hostname.size() - 2);
}
struct addrinfo hint, *result;
OPENSSL_memset(&hint, 0, sizeof(hint));
hint.ai_family = AF_UNSPEC;
hint.ai_socktype = SOCK_STREAM;
int ret = getaddrinfo(hostname.c_str(), port.c_str(), &hint, &result);
if (ret != 0) {
fprintf(stderr, "getaddrinfo returned: %s\n", gai_strerror(ret));
return false;
}
bool ok = false;
char buf[256];
*out_sock =
socket(result->ai_family, result->ai_socktype, result->ai_protocol);
if (*out_sock < 0) {
perror("socket");
goto out;
}
switch (result->ai_family) {
case AF_INET: {
struct sockaddr_in *sin =
reinterpret_cast<struct sockaddr_in *>(result->ai_addr);
fprintf(stderr, "Connecting to %s:%d\n",
inet_ntop(result->ai_family, &sin->sin_addr, buf, sizeof(buf)),
ntohs(sin->sin_port));
break;
}
case AF_INET6: {
struct sockaddr_in6 *sin6 =
reinterpret_cast<struct sockaddr_in6 *>(result->ai_addr);
fprintf(stderr, "Connecting to [%s]:%d\n",
inet_ntop(result->ai_family, &sin6->sin6_addr, buf, sizeof(buf)),
ntohs(sin6->sin6_port));
break;
}
}
if (connect(*out_sock, result->ai_addr, result->ai_addrlen) != 0) {
perror("connect");
goto out;
}
ok = true;
out:
freeaddrinfo(result);
return ok;
}
bool Accept(int *out_sock, const std::string &port) {
struct sockaddr_in6 addr, cli_addr;
socklen_t cli_addr_len = sizeof(cli_addr);
OPENSSL_memset(&addr, 0, sizeof(addr));
addr.sin6_family = AF_INET6;
addr.sin6_addr = IN6ADDR_ANY_INIT;
addr.sin6_port = htons(atoi(port.c_str()));
bool ok = false;
#if defined(OPENSSL_WINDOWS)
const BOOL enable = TRUE;
#else
const int enable = 1;
#endif
int server_sock = -1;
server_sock =
socket(addr.sin6_family, SOCK_STREAM, 0);
if (server_sock < 0) {
perror("socket");
goto out;
}
if (setsockopt(server_sock, SOL_SOCKET, SO_REUSEADDR, (const char *)&enable,
sizeof(enable)) < 0) {
perror("setsockopt");
goto out;
}
if (bind(server_sock, (struct sockaddr*)&addr, sizeof(addr)) != 0) {
perror("connect");
goto out;
}
listen(server_sock, 1);
*out_sock = accept(server_sock, (struct sockaddr*)&cli_addr, &cli_addr_len);
ok = true;
out:
closesocket(server_sock);
return ok;
}
bool VersionFromString(uint16_t *out_version, const std::string &version) {
if (version == "ssl3") {
*out_version = SSL3_VERSION;
return true;
} else if (version == "tls1" || version == "tls1.0") {
*out_version = TLS1_VERSION;
return true;
} else if (version == "tls1.1") {
*out_version = TLS1_1_VERSION;
return true;
} else if (version == "tls1.2") {
*out_version = TLS1_2_VERSION;
return true;
} else if (version == "tls1.3") {
*out_version = TLS1_3_VERSION;
return true;
}
return false;
}
static const char *SignatureAlgorithmToString(uint16_t version, uint16_t sigalg) {
const bool is_tls12 = version == TLS1_2_VERSION || version == DTLS1_2_VERSION;
switch (sigalg) {
case SSL_SIGN_RSA_PKCS1_SHA1:
return "rsa_pkcs1_sha1";
case SSL_SIGN_RSA_PKCS1_SHA256:
return "rsa_pkcs1_sha256";
case SSL_SIGN_RSA_PKCS1_SHA384:
return "rsa_pkcs1_sha384";
case SSL_SIGN_RSA_PKCS1_SHA512:
return "rsa_pkcs1_sha512";
case SSL_SIGN_ECDSA_SHA1:
return "ecdsa_sha1";
case SSL_SIGN_ECDSA_SECP256R1_SHA256:
return is_tls12 ? "ecdsa_sha256" : "ecdsa_secp256r1_sha256";
case SSL_SIGN_ECDSA_SECP384R1_SHA384:
return is_tls12 ? "ecdsa_sha384" : "ecdsa_secp384r1_sha384";
case SSL_SIGN_ECDSA_SECP521R1_SHA512:
return is_tls12 ? "ecdsa_sha512" : "ecdsa_secp521r1_sha512";
case SSL_SIGN_RSA_PSS_SHA256:
return "rsa_pss_sha256";
case SSL_SIGN_RSA_PSS_SHA384:
return "rsa_pss_sha384";
case SSL_SIGN_RSA_PSS_SHA512:
return "rsa_pss_sha512";
default:
return "(unknown)";
}
}
void PrintConnectionInfo(const SSL *ssl) {
const SSL_CIPHER *cipher = SSL_get_current_cipher(ssl);
fprintf(stderr, " Version: %s\n", SSL_get_version(ssl));
fprintf(stderr, " Resumed session: %s\n",
SSL_session_reused(ssl) ? "yes" : "no");
fprintf(stderr, " Cipher: %s\n", SSL_CIPHER_get_name(cipher));
uint16_t curve = SSL_get_curve_id(ssl);
if (curve != 0) {
fprintf(stderr, " ECDHE curve: %s\n", SSL_get_curve_name(curve));
}
uint16_t sigalg = SSL_get_peer_signature_algorithm(ssl);
if (sigalg != 0) {
fprintf(stderr, " Signature algorithm: %s\n",
SignatureAlgorithmToString(SSL_version(ssl), sigalg));
}
fprintf(stderr, " Secure renegotiation: %s\n",
SSL_get_secure_renegotiation_support(ssl) ? "yes" : "no");
fprintf(stderr, " Extended master secret: %s\n",
SSL_get_extms_support(ssl) ? "yes" : "no");
const uint8_t *next_proto;
unsigned next_proto_len;
SSL_get0_next_proto_negotiated(ssl, &next_proto, &next_proto_len);
fprintf(stderr, " Next protocol negotiated: %.*s\n", next_proto_len,
next_proto);
const uint8_t *alpn;
unsigned alpn_len;
SSL_get0_alpn_selected(ssl, &alpn, &alpn_len);
fprintf(stderr, " ALPN protocol: %.*s\n", alpn_len, alpn);
const char *host_name = SSL_get_servername(ssl, TLSEXT_NAMETYPE_host_name);
if (host_name != nullptr && SSL_is_server(ssl)) {
fprintf(stderr, " Client sent SNI: %s\n", host_name);
}
if (!SSL_is_server(ssl)) {
const uint8_t *ocsp_staple;
size_t ocsp_staple_len;
SSL_get0_ocsp_response(ssl, &ocsp_staple, &ocsp_staple_len);
fprintf(stderr, " OCSP staple: %s\n", ocsp_staple_len > 0 ? "yes" : "no");
const uint8_t *sct_list;
size_t sct_list_len;
SSL_get0_signed_cert_timestamp_list(ssl, &sct_list, &sct_list_len);
fprintf(stderr, " SCT list: %s\n", sct_list_len > 0 ? "yes" : "no");
}
fprintf(stderr, " Early data: %s\n",
SSL_early_data_accepted(ssl) ? "yes" : "no");
// Print the server cert subject and issuer names.
bssl::UniquePtr<X509> peer(SSL_get_peer_certificate(ssl));
if (peer != nullptr) {
fprintf(stderr, " Cert subject: ");
X509_NAME_print_ex_fp(stderr, X509_get_subject_name(peer.get()), 0,
XN_FLAG_ONELINE);
fprintf(stderr, "\n Cert issuer: ");
X509_NAME_print_ex_fp(stderr, X509_get_issuer_name(peer.get()), 0,
XN_FLAG_ONELINE);
fprintf(stderr, "\n");
}
}
bool SocketSetNonBlocking(int sock, bool is_non_blocking) {
bool ok;
#if defined(OPENSSL_WINDOWS)
u_long arg = is_non_blocking;
ok = 0 == ioctlsocket(sock, FIONBIO, &arg);
#else
int flags = fcntl(sock, F_GETFL, 0);
if (flags < 0) {
return false;
}
if (is_non_blocking) {
flags |= O_NONBLOCK;
} else {
flags &= ~O_NONBLOCK;
}
ok = 0 == fcntl(sock, F_SETFL, flags);
#endif
if (!ok) {
fprintf(stderr, "Failed to set socket non-blocking.\n");
}
return ok;
}
// PrintErrorCallback is a callback function from OpenSSL's
// |ERR_print_errors_cb| that writes errors to a given |FILE*|.
int PrintErrorCallback(const char *str, size_t len, void *ctx) {
fwrite(str, len, 1, reinterpret_cast<FILE*>(ctx));
return 1;
}
bool TransferData(SSL *ssl, int sock) {
bool stdin_open = true;
fd_set read_fds;
FD_ZERO(&read_fds);
if (!SocketSetNonBlocking(sock, true)) {
return false;
}
for (;;) {
if (stdin_open) {
FD_SET(0, &read_fds);
}
FD_SET(sock, &read_fds);
int ret = select(sock + 1, &read_fds, NULL, NULL, NULL);
if (ret <= 0) {
perror("select");
return false;
}
if (FD_ISSET(0, &read_fds)) {
uint8_t buffer[512];
ssize_t n;
do {
n = BORINGSSL_READ(0, buffer, sizeof(buffer));
} while (n == -1 && errno == EINTR);
if (n == 0) {
FD_CLR(0, &read_fds);
stdin_open = false;
#if !defined(OPENSSL_WINDOWS)
shutdown(sock, SHUT_WR);
#else
shutdown(sock, SD_SEND);
#endif
continue;
} else if (n < 0) {
perror("read from stdin");
return false;
}
if (!SocketSetNonBlocking(sock, false)) {
return false;
}
int ssl_ret = SSL_write(ssl, buffer, n);
if (!SocketSetNonBlocking(sock, true)) {
return false;
}
if (ssl_ret <= 0) {
int ssl_err = SSL_get_error(ssl, ssl_ret);
fprintf(stderr, "Error while writing: %d\n", ssl_err);
ERR_print_errors_cb(PrintErrorCallback, stderr);
return false;
} else if (ssl_ret != n) {
fprintf(stderr, "Short write from SSL_write.\n");
return false;
}
}
if (FD_ISSET(sock, &read_fds)) {
uint8_t buffer[512];
int ssl_ret = SSL_read(ssl, buffer, sizeof(buffer));
if (ssl_ret < 0) {
int ssl_err = SSL_get_error(ssl, ssl_ret);
if (ssl_err == SSL_ERROR_WANT_READ) {
continue;
}
fprintf(stderr, "Error while reading: %d\n", ssl_err);
ERR_print_errors_cb(PrintErrorCallback, stderr);
return false;
} else if (ssl_ret == 0) {
return true;
}
ssize_t n;
do {
n = BORINGSSL_WRITE(1, buffer, ssl_ret);
} while (n == -1 && errno == EINTR);
if (n != ssl_ret) {
fprintf(stderr, "Short write to stderr.\n");
return false;
}
}
}
}
// SocketLineReader wraps a small buffer around a socket for line-orientated
// protocols.
class SocketLineReader {
public:
explicit SocketLineReader(int sock) : sock_(sock) {}
// Next reads a '\n'- or '\r\n'-terminated line from the socket and, on
// success, sets |*out_line| to it and returns true. Otherwise it returns
// false.
bool Next(std::string *out_line) {
for (;;) {
for (size_t i = 0; i < buf_len_; i++) {
if (buf_[i] != '\n') {
continue;
}
size_t length = i;
if (i > 0 && buf_[i - 1] == '\r') {
length--;
}
out_line->assign(buf_, length);
buf_len_ -= i + 1;
OPENSSL_memmove(buf_, &buf_[i + 1], buf_len_);
return true;
}
if (buf_len_ == sizeof(buf_)) {
fprintf(stderr, "Received line too long!\n");
return false;
}
ssize_t n;
do {
n = recv(sock_, &buf_[buf_len_], sizeof(buf_) - buf_len_, 0);
} while (n == -1 && errno == EINTR);
if (n < 0) {
fprintf(stderr, "Read error from socket\n");
return false;
}
buf_len_ += n;
}
}
// ReadSMTPReply reads one or more lines that make up an SMTP reply. On
// success, it sets |*out_code| to the reply's code (e.g. 250) and
// |*out_content| to the body of the reply (e.g. "OK") and returns true.
// Otherwise it returns false.
//
// See https://tools.ietf.org/html/rfc821#page-48
bool ReadSMTPReply(unsigned *out_code, std::string *out_content) {
out_content->clear();
// kMaxLines is the maximum number of lines that we'll accept in an SMTP
// reply.
static const unsigned kMaxLines = 512;
for (unsigned i = 0; i < kMaxLines; i++) {
std::string line;
if (!Next(&line)) {
return false;
}
if (line.size() < 4) {
fprintf(stderr, "Short line from SMTP server: %s\n", line.c_str());
return false;
}
const std::string code_str = line.substr(0, 3);
char *endptr;
const unsigned long code = strtoul(code_str.c_str(), &endptr, 10);
if (*endptr || code > UINT_MAX) {
fprintf(stderr, "Failed to parse code from line: %s\n", line.c_str());
return false;
}
if (i == 0) {
*out_code = code;
} else if (code != *out_code) {
fprintf(stderr,
"Reply code varied within a single reply: was %u, now %u\n",
*out_code, static_cast<unsigned>(code));
return false;
}
if (line[3] == ' ') {
// End of reply.
*out_content += line.substr(4, std::string::npos);
return true;
} else if (line[3] == '-') {
// Another line of reply will follow this one.
*out_content += line.substr(4, std::string::npos);
out_content->push_back('\n');
} else {
fprintf(stderr, "Bad character after code in SMTP reply: %s\n",
line.c_str());
return false;
}
}
fprintf(stderr, "Rejected SMTP reply of more then %u lines\n", kMaxLines);
return false;
}
private:
const int sock_;
char buf_[512];
size_t buf_len_ = 0;
};
// SendAll writes |data_len| bytes from |data| to |sock|. It returns true on
// success and false otherwise.
static bool SendAll(int sock, const char *data, size_t data_len) {
size_t done = 0;
while (done < data_len) {
ssize_t n;
do {
n = send(sock, &data[done], data_len - done, 0);
} while (n == -1 && errno == EINTR);
if (n < 0) {
fprintf(stderr, "Error while writing to socket\n");
return false;
}
done += n;
}
return true;
}
bool DoSMTPStartTLS(int sock) {
SocketLineReader line_reader(sock);
unsigned code_220 = 0;
std::string reply_220;
if (!line_reader.ReadSMTPReply(&code_220, &reply_220)) {
return false;
}
if (code_220 != 220) {
fprintf(stderr, "Expected 220 line from SMTP server but got code %u\n",
code_220);
return false;
}
static const char kHelloLine[] = "EHLO BoringSSL\r\n";
if (!SendAll(sock, kHelloLine, sizeof(kHelloLine) - 1)) {
return false;
}
unsigned code_250 = 0;
std::string reply_250;
if (!line_reader.ReadSMTPReply(&code_250, &reply_250)) {
return false;
}
if (code_250 != 250) {
fprintf(stderr, "Expected 250 line after EHLO but got code %u\n", code_250);
return false;
}
// https://tools.ietf.org/html/rfc1869#section-4.3
if (("\n" + reply_250 + "\n").find("\nSTARTTLS\n") == std::string::npos) {
fprintf(stderr, "Server does not support STARTTLS\n");
return false;
}
static const char kSTARTTLSLine[] = "STARTTLS\r\n";
if (!SendAll(sock, kSTARTTLSLine, sizeof(kSTARTTLSLine) - 1)) {
return false;
}
if (!line_reader.ReadSMTPReply(&code_220, &reply_220)) {
return false;
}
if (code_220 != 220) {
fprintf(
stderr,
"Expected 220 line from SMTP server after STARTTLS, but got code %u\n",
code_220);
return false;
}
return true;
}