curl_darwinssl.c

                            128,
                            kCFStringEncodingUTF8)) {
        infof(data, "Server certificate: %s\n", server_cert_summary_c);
      }
      CFRelease(server_cert_summary);
    }
    CFRelease(trust);
  }
#else
  /* SSLCopyPeerCertificates() is deprecated as of Mountain Lion.
     The function SecTrustGetCertificateAtIndex() is officially present
     in Lion, but it is unfortunately also present in Snow Leopard as
     private API and doesn't work as expected. So we have to look for
     a different symbol to make sure this code is only executed under
     Lion or later. */
  if(SecTrustEvaluateAsync != NULL) {
#pragma unused(server_certs)
    err = SSLCopyPeerTrust(connssl->ssl_ctx, &trust);
    if(err == noErr) {
      count = SecTrustGetCertificateCount(trust);
      for(i = 0L ; i < count ; i++) {
        server_cert = SecTrustGetCertificateAtIndex(trust, i);
        server_cert_summary =
          SecCertificateCopyLongDescription(NULL, server_cert, NULL);
        memset(server_cert_summary_c, 0, 128);
        if(CFStringGetCString(server_cert_summary,
                              server_cert_summary_c,
                              128,
                              kCFStringEncodingUTF8)) {
          infof(data, "Server certificate: %s\n", server_cert_summary_c);
        }
        CFRelease(server_cert_summary);
      }
      CFRelease(trust);
    }
  }
  else {
    err = SSLCopyPeerCertificates(connssl->ssl_ctx, &server_certs);
    if(err == noErr) {
      count = CFArrayGetCount(server_certs);
      for(i = 0L ; i < count ; i++) {
        server_cert = (SecCertificateRef)CFArrayGetValueAtIndex(server_certs,
                                                                i);

        server_cert_summary = SecCertificateCopySubjectSummary(server_cert);
        memset(server_cert_summary_c, 0, 128);
        if(CFStringGetCString(server_cert_summary,
                              server_cert_summary_c,
                              128,
                              kCFStringEncodingUTF8)) {
          infof(data, "Server certificate: %s\n", server_cert_summary_c);
        }
        CFRelease(server_cert_summary);
      }
      CFRelease(server_certs);
    }
  }
#endif /* (TARGET_OS_EMBEDDED || TARGET_OS_IPHONE) */
#else
#pragma unused(trust)
  err = SSLCopyPeerCertificates(connssl->ssl_ctx, &server_certs);
  if(err == noErr) {
    count = CFArrayGetCount(server_certs);
    for(i = 0L ; i < count ; i++) {
      server_cert = (SecCertificateRef)CFArrayGetValueAtIndex(server_certs, i);

      server_cert_summary = SecCertificateCopySubjectSummary(server_cert);
      memset(server_cert_summary_c, 0, 128);
      if(CFStringGetCString(server_cert_summary,
                            server_cert_summary_c,
                            128,
                            kCFStringEncodingUTF8)) {
        infof(data, "Server certificate: %s\n", server_cert_summary_c);
      }
      CFRelease(server_cert_summary);
    }
    CFRelease(server_certs);
  }
#endif /* defined(__MAC_10_7) || defined(__IPHONE_5_0) */

  connssl->connecting_state = ssl_connect_done;
  return CURLE_OK;
}

static Curl_recv darwinssl_recv;
static Curl_send darwinssl_send;

static CURLcode
darwinssl_connect_common(struct connectdata *conn,
                         int sockindex,
                         bool nonblocking,
                         bool *done)
{
  CURLcode retcode;
  struct SessionHandle *data = conn->data;
  struct ssl_connect_data *connssl = &conn->ssl[sockindex];
  curl_socket_t sockfd = conn->sock[sockindex];
  long timeout_ms;
  int what;

  /* check if the connection has already been established */
  if(ssl_connection_complete == connssl->state) {
    *done = TRUE;
    return CURLE_OK;
  }

  if(ssl_connect_1==connssl->connecting_state) {
    /* Find out how much more time we're allowed */
    timeout_ms = Curl_timeleft(data, NULL, TRUE);

    if(timeout_ms < 0) {
      /* no need to continue if time already is up */
      failf(data, "SSL connection timeout");
      return CURLE_OPERATION_TIMEDOUT;
    }
    retcode = darwinssl_connect_step1(conn, sockindex);
    if(retcode)
      return retcode;
  }

  while(ssl_connect_2 == connssl->connecting_state ||
        ssl_connect_2_reading == connssl->connecting_state ||
        ssl_connect_2_writing == connssl->connecting_state) {

    /* check allowed time left */
    timeout_ms = Curl_timeleft(data, NULL, TRUE);

    if(timeout_ms < 0) {
      /* no need to continue if time already is up */
      failf(data, "SSL connection timeout");
      return CURLE_OPERATION_TIMEDOUT;
    }

    /* if ssl is expecting something, check if it's available. */
    if(connssl->connecting_state == ssl_connect_2_reading
       || connssl->connecting_state == ssl_connect_2_writing) {

      curl_socket_t writefd = ssl_connect_2_writing ==
      connssl->connecting_state?sockfd:CURL_SOCKET_BAD;
      curl_socket_t readfd = ssl_connect_2_reading ==
      connssl->connecting_state?sockfd:CURL_SOCKET_BAD;

      what = Curl_socket_ready(readfd, writefd, nonblocking?0:timeout_ms);
      if(what < 0) {
        /* fatal error */
        failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
        return CURLE_SSL_CONNECT_ERROR;
      }
      else if(0 == what) {
        if(nonblocking) {
          *done = FALSE;
          return CURLE_OK;
        }
        else {
          /* timeout */
          failf(data, "SSL connection timeout");
          return CURLE_OPERATION_TIMEDOUT;
        }
      }
      /* socket is readable or writable */
    }

    /* Run transaction, and return to the caller if it failed or if this
     * connection is done nonblocking and this loop would execute again. This
     * permits the owner of a multi handle to abort a connection attempt
     * before step2 has completed while ensuring that a client using select()
     * or epoll() will always have a valid fdset to wait on.
     */
    retcode = darwinssl_connect_step2(conn, sockindex);
    if(retcode || (nonblocking &&
                   (ssl_connect_2 == connssl->connecting_state ||
                    ssl_connect_2_reading == connssl->connecting_state ||
                    ssl_connect_2_writing == connssl->connecting_state)))
      return retcode;

  } /* repeat step2 until all transactions are done. */


  if(ssl_connect_3==connssl->connecting_state) {
    retcode = darwinssl_connect_step3(conn, sockindex);
    if(retcode)
      return retcode;
  }

  if(ssl_connect_done==connssl->connecting_state) {
    connssl->state = ssl_connection_complete;
    conn->recv[sockindex] = darwinssl_recv;
    conn->send[sockindex] = darwinssl_send;
    *done = TRUE;
  }
  else
    *done = FALSE;

  /* Reset our connect state machine */
  connssl->connecting_state = ssl_connect_1;

  return CURLE_OK;
}

CURLcode
Curl_darwinssl_connect_nonblocking(struct connectdata *conn,
                                   int sockindex,
                                   bool *done)
{
  return darwinssl_connect_common(conn, sockindex, TRUE, done);
}

CURLcode
Curl_darwinssl_connect(struct connectdata *conn,
                       int sockindex)
{
  CURLcode retcode;
  bool done = FALSE;

  retcode = darwinssl_connect_common(conn, sockindex, FALSE, &done);

  if(retcode)
    return retcode;

  DEBUGASSERT(done);

  return CURLE_OK;
}

void Curl_darwinssl_close(struct connectdata *conn, int sockindex)
{
  struct ssl_connect_data *connssl = &conn->ssl[sockindex];

  if(connssl->ssl_ctx) {
    (void)SSLClose(connssl->ssl_ctx);
#if defined(__MAC_10_8) || defined(__IPHONE_5_0)
    if(SSLCreateContext != NULL)
      CFRelease(connssl->ssl_ctx);
#if (TARGET_OS_MAC && !(TARGET_OS_EMBEDDED || TARGET_OS_IPHONE))
    else
      (void)SSLDisposeContext(connssl->ssl_ctx);
#endif  /* (TARGET_OS_MAC && !(TARGET_OS_EMBEDDED || TARGET_OS_IPHONE)) */
#else
    (void)SSLDisposeContext(connssl->ssl_ctx);
#endif /* defined(__MAC_10_8) || defined(__IPHONE_5_0) */
    connssl->ssl_ctx = NULL;
  }
  connssl->ssl_sockfd = 0;
}

void Curl_darwinssl_close_all(struct SessionHandle *data)
{
  /* SecureTransport doesn't separate sessions from contexts, so... */
  (void)data;
}

int Curl_darwinssl_shutdown(struct connectdata *conn, int sockindex)
{
  struct ssl_connect_data *connssl = &conn->ssl[sockindex];
  struct SessionHandle *data = conn->data;
  ssize_t nread;
  int what;
  int rc;
  char buf[120];

  if(!connssl->ssl_ctx)
    return 0;

  if(data->set.ftp_ccc != CURLFTPSSL_CCC_ACTIVE)
    return 0;

  Curl_darwinssl_close(conn, sockindex);

  rc = 0;

  what = Curl_socket_ready(conn->sock[sockindex],
                           CURL_SOCKET_BAD, SSL_SHUTDOWN_TIMEOUT);

  for(;;) {
    if(what < 0) {
      /* anything that gets here is fatally bad */
      failf(data, "select/poll on SSL socket, errno: %d", SOCKERRNO);
      rc = -1;
      break;
    }

    if(!what) {                                /* timeout */
      failf(data, "SSL shutdown timeout");
      break;
    }

    /* Something to read, let's do it and hope that it is the close
     notify alert from the server. No way to SSL_Read now, so use read(). */

    nread = read(conn->sock[sockindex], buf, sizeof(buf));

    if(nread < 0) {
      failf(data, "read: %s", strerror(errno));
      rc = -1;
    }

    if(nread <= 0)
      break;

    what = Curl_socket_ready(conn->sock[sockindex], CURL_SOCKET_BAD, 0);
  }

  return rc;
}

size_t Curl_darwinssl_version(char *buffer, size_t size)
{
  return snprintf(buffer, size, "SecureTransport");
}

/*
 * This function uses SSLGetSessionState to determine connection status.
 *
 * Return codes:
 *     1 means the connection is still in place
 *     0 means the connection has been closed
 *    -1 means the connection status is unknown
 */
int Curl_darwinssl_check_cxn(struct connectdata *conn)
{
  struct ssl_connect_data *connssl = &conn->ssl[FIRSTSOCKET];
  OSStatus err;
  SSLSessionState state;

  if(connssl->ssl_ctx) {
    err = SSLGetSessionState(connssl->ssl_ctx, &state);
    if(err == noErr)
      return state == kSSLConnected || state == kSSLHandshake;
    return -1;
  }
  return 0;
}

bool Curl_darwinssl_data_pending(const struct connectdata *conn,
                                 int connindex)
{
  const struct ssl_connect_data *connssl = &conn->ssl[connindex];
  OSStatus err;
  size_t buffer;

  if(connssl->ssl_ctx) {  /* SSL is in use */
    err = SSLGetBufferedReadSize(connssl->ssl_ctx, &buffer);
    if(err == noErr)
      return buffer > 0UL;
    return false;
  }
  else
    return false;
}

void Curl_darwinssl_random(struct SessionHandle *data,
                           unsigned char *entropy,
                           size_t length)
{
  /* arc4random_buf() isn't available on cats older than Lion, so let's
     do this manually for the benefit of the older cats. */
  size_t i;
  u_int32_t random_number = 0;

  for(i = 0 ; i < length ; i++) {
    if(i % sizeof(u_int32_t) == 0)
      random_number = arc4random();
    entropy[i] = random_number & 0xFF;
    random_number >>= 8;
  }
  i = random_number = 0;
  (void)data;
}

void Curl_darwinssl_md5sum(unsigned char *tmp, /* input */
                           size_t tmplen,
                           unsigned char *md5sum, /* output */
                           size_t md5len)
{
  (void)md5len;
  (void)CC_MD5(tmp, (CC_LONG)tmplen, md5sum);
}

static ssize_t darwinssl_send(struct connectdata *conn,
                              int sockindex,
                              const void *mem,
                              size_t len,
                              CURLcode *curlcode)
{
  /*struct SessionHandle *data = conn->data;*/
  struct ssl_connect_data *connssl = &conn->ssl[sockindex];
  size_t processed;
  OSStatus err = SSLWrite(connssl->ssl_ctx, mem, len, &processed);

  if(err != noErr) {
    switch (err) {
      case errSSLWouldBlock:  /* we're not done yet; keep sending */
        *curlcode = CURLE_AGAIN;
        return -1;
        break;

      default:
        failf(conn->data, "SSLWrite() return error %d", err);
        *curlcode = CURLE_SEND_ERROR;
        return -1;
        break;
    }
  }
  return (ssize_t)processed;
}

static ssize_t darwinssl_recv(struct connectdata *conn,
                              int num,
                              char *buf,
                              size_t buffersize,
                              CURLcode *curlcode)
{
  /*struct SessionHandle *data = conn->data;*/
  struct ssl_connect_data *connssl = &conn->ssl[num];
  size_t processed;
  OSStatus err = SSLRead(connssl->ssl_ctx, buf, buffersize, &processed);

  if(err != noErr) {
    switch (err) {
      case errSSLWouldBlock:  /* we're not done yet; keep reading */
        *curlcode = CURLE_AGAIN;
        return -1;
        break;

      case errSSLClosedGraceful: /* they're done; fail gracefully */
        *curlcode = CURLE_OK;
        return -1;
        break;

      default:
        failf(conn->data, "SSLRead() return error %d", err);
        *curlcode = CURLE_RECV_ERROR;
        return -1;
        break;
    }
  }
  return (ssize_t)processed;
}

#endif /* USE_DARWINSSL */