Logo Search packages:      
Sourcecode: openssl version File versions

bio_ssl.c

/* ssl/bio_ssl.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 * 
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 * 
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from 
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 * 
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * 
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <openssl/crypto.h>
#include <openssl/bio.h>
#include <openssl/err.h>
#include <openssl/ssl.h>

static int ssl_write(BIO *h, const char *buf, int num);
static int ssl_read(BIO *h, char *buf, int size);
static int ssl_puts(BIO *h, const char *str);
static long ssl_ctrl(BIO *h, int cmd, long arg1, void *arg2);
static int ssl_new(BIO *h);
static int ssl_free(BIO *data);
static long ssl_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
typedef struct bio_ssl_st
      {
      SSL *ssl; /* The ssl handle :-) */
      /* re-negotiate every time the total number of bytes is this size */
      int num_renegotiates;
      unsigned long renegotiate_count;
      unsigned long byte_count;
      unsigned long renegotiate_timeout;
      unsigned long last_time;
      } BIO_SSL;

static BIO_METHOD methods_sslp=
      {
      BIO_TYPE_SSL,"ssl",
      ssl_write,
      ssl_read,
      ssl_puts,
      NULL, /* ssl_gets, */
      ssl_ctrl,
      ssl_new,
      ssl_free,
      ssl_callback_ctrl,
      };

BIO_METHOD *BIO_f_ssl(void)
      {
      return(&methods_sslp);
      }

static int ssl_new(BIO *bi)
      {
      BIO_SSL *bs;

      bs=(BIO_SSL *)OPENSSL_malloc(sizeof(BIO_SSL));
      if (bs == NULL)
            {
            BIOerr(BIO_F_SSL_NEW,ERR_R_MALLOC_FAILURE);
            return(0);
            }
      memset(bs,0,sizeof(BIO_SSL));
      bi->init=0;
      bi->ptr=(char *)bs;
      bi->flags=0;
      return(1);
      }

static int ssl_free(BIO *a)
      {
      BIO_SSL *bs;

      if (a == NULL) return(0);
      bs=(BIO_SSL *)a->ptr;
      if (bs->ssl != NULL) SSL_shutdown(bs->ssl);
      if (a->shutdown)
            {
            if (a->init && (bs->ssl != NULL))
                  SSL_free(bs->ssl);
            a->init=0;
            a->flags=0;
            }
      if (a->ptr != NULL)
            OPENSSL_free(a->ptr);
      return(1);
      }
      
static int ssl_read(BIO *b, char *out, int outl)
      {
      int ret=1;
      BIO_SSL *sb;
      SSL *ssl;
      int retry_reason=0;
      int r=0;

      if (out == NULL) return(0);
      sb=(BIO_SSL *)b->ptr;
      ssl=sb->ssl;

      BIO_clear_retry_flags(b);

#if 0
      if (!SSL_is_init_finished(ssl))
            {
/*          ret=SSL_do_handshake(ssl); */
            if (ret > 0)
                  {

                  outflags=(BIO_FLAGS_READ|BIO_FLAGS_SHOULD_RETRY);
                  ret= -1;
                  goto end;
                  }
            }
#endif
/*    if (ret > 0) */
      ret=SSL_read(ssl,out,outl);

      switch (SSL_get_error(ssl,ret))
            {
      case SSL_ERROR_NONE:
            if (ret <= 0) break;
            if (sb->renegotiate_count > 0)
                  {
                  sb->byte_count+=ret;
                  if (sb->byte_count > sb->renegotiate_count)
                        {
                        sb->byte_count=0;
                        sb->num_renegotiates++;
                        SSL_renegotiate(ssl);
                        r=1;
                        }
                  }
            if ((sb->renegotiate_timeout > 0) && (!r))
                  {
                  unsigned long tm;

                  tm=(unsigned long)time(NULL);
                  if (tm > sb->last_time+sb->renegotiate_timeout)
                        {
                        sb->last_time=tm;
                        sb->num_renegotiates++;
                        SSL_renegotiate(ssl);
                        }
                  }

            break;
      case SSL_ERROR_WANT_READ:
            BIO_set_retry_read(b);
            break;
      case SSL_ERROR_WANT_WRITE:
            BIO_set_retry_write(b);
            break;
      case SSL_ERROR_WANT_X509_LOOKUP:
            BIO_set_retry_special(b);
            retry_reason=BIO_RR_SSL_X509_LOOKUP;
            break;
      case SSL_ERROR_WANT_ACCEPT:
            BIO_set_retry_special(b);
            retry_reason=BIO_RR_ACCEPT;
            break;
      case SSL_ERROR_WANT_CONNECT:
            BIO_set_retry_special(b);
            retry_reason=BIO_RR_CONNECT;
            break;
      case SSL_ERROR_SYSCALL:
      case SSL_ERROR_SSL:
      case SSL_ERROR_ZERO_RETURN:
      default:
            break;
            }

      b->retry_reason=retry_reason;
      return(ret);
      }

static int ssl_write(BIO *b, const char *out, int outl)
      {
      int ret,r=0;
      int retry_reason=0;
      SSL *ssl;
      BIO_SSL *bs;

      if (out == NULL) return(0);
      bs=(BIO_SSL *)b->ptr;
      ssl=bs->ssl;

      BIO_clear_retry_flags(b);

/*    ret=SSL_do_handshake(ssl);
      if (ret > 0) */
      ret=SSL_write(ssl,out,outl);

      switch (SSL_get_error(ssl,ret))
            {
      case SSL_ERROR_NONE:
            if (ret <= 0) break;
            if (bs->renegotiate_count > 0)
                  {
                  bs->byte_count+=ret;
                  if (bs->byte_count > bs->renegotiate_count)
                        {
                        bs->byte_count=0;
                        bs->num_renegotiates++;
                        SSL_renegotiate(ssl);
                        r=1;
                        }
                  }
            if ((bs->renegotiate_timeout > 0) && (!r))
                  {
                  unsigned long tm;

                  tm=(unsigned long)time(NULL);
                  if (tm > bs->last_time+bs->renegotiate_timeout)
                        {
                        bs->last_time=tm;
                        bs->num_renegotiates++;
                        SSL_renegotiate(ssl);
                        }
                  }
            break;
      case SSL_ERROR_WANT_WRITE:
            BIO_set_retry_write(b);
            break;
      case SSL_ERROR_WANT_READ:
            BIO_set_retry_read(b);
            break;
      case SSL_ERROR_WANT_X509_LOOKUP:
            BIO_set_retry_special(b);
            retry_reason=BIO_RR_SSL_X509_LOOKUP;
            break;
      case SSL_ERROR_WANT_CONNECT:
            BIO_set_retry_special(b);
            retry_reason=BIO_RR_CONNECT;
      case SSL_ERROR_SYSCALL:
      case SSL_ERROR_SSL:
      default:
            break;
            }

      b->retry_reason=retry_reason;
      return(ret);
      }

static long ssl_ctrl(BIO *b, int cmd, long num, void *ptr)
      {
      SSL **sslp,*ssl;
      BIO_SSL *bs;
      BIO *dbio,*bio;
      long ret=1;

      bs=(BIO_SSL *)b->ptr;
      ssl=bs->ssl;
      if ((ssl == NULL)  && (cmd != BIO_C_SET_SSL))
            return(0);
      switch (cmd)
            {
      case BIO_CTRL_RESET:
            SSL_shutdown(ssl);

            if (ssl->handshake_func == ssl->method->ssl_connect)
                  SSL_set_connect_state(ssl);
            else if (ssl->handshake_func == ssl->method->ssl_accept)
                  SSL_set_accept_state(ssl);

            SSL_clear(ssl);

            if (b->next_bio != NULL)
                  ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
            else if (ssl->rbio != NULL)
                  ret=BIO_ctrl(ssl->rbio,cmd,num,ptr);
            else
                  ret=1;
            break;
      case BIO_CTRL_INFO:
            ret=0;
            break;
      case BIO_C_SSL_MODE:
            if (num) /* client mode */
                  SSL_set_connect_state(ssl);
            else
                  SSL_set_accept_state(ssl);
            break;
      case BIO_C_SET_SSL_RENEGOTIATE_TIMEOUT:
            ret=bs->renegotiate_timeout;
            if (num < 60) num=5;
            bs->renegotiate_timeout=(unsigned long)num;
            bs->last_time=(unsigned long)time(NULL);
            break;
      case BIO_C_SET_SSL_RENEGOTIATE_BYTES:
            ret=bs->renegotiate_count;
            if ((long)num >=512)
                  bs->renegotiate_count=(unsigned long)num;
            break;
      case BIO_C_GET_SSL_NUM_RENEGOTIATES:
            ret=bs->num_renegotiates;
            break;
      case BIO_C_SET_SSL:
            if (ssl != NULL)
                  ssl_free(b);
            b->shutdown=(int)num;
            ssl=(SSL *)ptr;
            ((BIO_SSL *)b->ptr)->ssl=ssl;
            bio=SSL_get_rbio(ssl);
            if (bio != NULL)
                  {
                  if (b->next_bio != NULL)
                        BIO_push(bio,b->next_bio);
                  b->next_bio=bio;
                  CRYPTO_add(&bio->references,1,CRYPTO_LOCK_BIO);
                  }
            b->init=1;
            break;
      case BIO_C_GET_SSL:
            if (ptr != NULL)
                  {
                  sslp=(SSL **)ptr;
                  *sslp=ssl;
                  }
            else
                  ret=0;
            break;
      case BIO_CTRL_GET_CLOSE:
            ret=b->shutdown;
            break;
      case BIO_CTRL_SET_CLOSE:
            b->shutdown=(int)num;
            break;
      case BIO_CTRL_WPENDING:
            ret=BIO_ctrl(ssl->wbio,cmd,num,ptr);
            break;
      case BIO_CTRL_PENDING:
            ret=SSL_pending(ssl);
            if (ret == 0)
                  ret=BIO_pending(ssl->rbio);
            break;
      case BIO_CTRL_FLUSH:
            BIO_clear_retry_flags(b);
            ret=BIO_ctrl(ssl->wbio,cmd,num,ptr);
            BIO_copy_next_retry(b);
            break;
      case BIO_CTRL_PUSH:
            if ((b->next_bio != NULL) && (b->next_bio != ssl->rbio))
                  {
                  SSL_set_bio(ssl,b->next_bio,b->next_bio);
                  CRYPTO_add(&b->next_bio->references,1,CRYPTO_LOCK_BIO);
                  }
            break;
      case BIO_CTRL_POP:
            /* ugly bit of a hack */
            if (ssl->rbio != ssl->wbio) /* we are in trouble :-( */
                  {
                  BIO_free_all(ssl->wbio);
                  }
            if (b->next_bio != NULL)
                  {
                  CRYPTO_add(&b->next_bio->references,1,CRYPTO_LOCK_BIO);
                  }
            ssl->wbio=NULL;
            ssl->rbio=NULL;
            break;
      case BIO_C_DO_STATE_MACHINE:
            BIO_clear_retry_flags(b);

            b->retry_reason=0;
            ret=(int)SSL_do_handshake(ssl);

            switch (SSL_get_error(ssl,(int)ret))
                  {
            case SSL_ERROR_WANT_READ:
                  BIO_set_flags(b,
                        BIO_FLAGS_READ|BIO_FLAGS_SHOULD_RETRY);
                  break;
            case SSL_ERROR_WANT_WRITE:
                  BIO_set_flags(b,
                        BIO_FLAGS_WRITE|BIO_FLAGS_SHOULD_RETRY);
                  break;
            case SSL_ERROR_WANT_CONNECT:
                  BIO_set_flags(b,
                        BIO_FLAGS_IO_SPECIAL|BIO_FLAGS_SHOULD_RETRY);
                  b->retry_reason=b->next_bio->retry_reason;
                  break;
            default:
                  break;
                  }
            break;
      case BIO_CTRL_DUP:
            dbio=(BIO *)ptr;
            if (((BIO_SSL *)dbio->ptr)->ssl != NULL)
                  SSL_free(((BIO_SSL *)dbio->ptr)->ssl);
            ((BIO_SSL *)dbio->ptr)->ssl=SSL_dup(ssl);
            ((BIO_SSL *)dbio->ptr)->renegotiate_count=
                  ((BIO_SSL *)b->ptr)->renegotiate_count;
            ((BIO_SSL *)dbio->ptr)->byte_count=
                  ((BIO_SSL *)b->ptr)->byte_count;
            ((BIO_SSL *)dbio->ptr)->renegotiate_timeout=
                  ((BIO_SSL *)b->ptr)->renegotiate_timeout;
            ((BIO_SSL *)dbio->ptr)->last_time=
                  ((BIO_SSL *)b->ptr)->last_time;
            ret=(((BIO_SSL *)dbio->ptr)->ssl != NULL);
            break;
      case BIO_C_GET_FD:
            ret=BIO_ctrl(ssl->rbio,cmd,num,ptr);
            break;
      case BIO_CTRL_SET_CALLBACK:
            {
#if 0 /* FIXME: Should this be used?  -- Richard Levitte */
            BIOerr(SSL_F_SSL_CTRL, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
            ret = -1;
#else
            ret=0;
#endif
            }
            break;
      case BIO_CTRL_GET_CALLBACK:
            {
            void (**fptr)();

            fptr=(void (**)())ptr;
            *fptr=SSL_get_info_callback(ssl);
            }
            break;
      default:
            ret=BIO_ctrl(ssl->rbio,cmd,num,ptr);
            break;
            }
      return(ret);
      }

static long ssl_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
      {
      SSL *ssl;
      BIO_SSL *bs;
      long ret=1;

      bs=(BIO_SSL *)b->ptr;
      ssl=bs->ssl;
      switch (cmd)
            {
      case BIO_CTRL_SET_CALLBACK:
            {
            /* FIXME: setting this via a completely different prototype
               seems like a crap idea */
            SSL_set_info_callback(ssl,(void (*)(const SSL *,int,int))fp);
            }
            break;
      default:
            ret=BIO_callback_ctrl(ssl->rbio,cmd,fp);
            break;
            }
      return(ret);
      }

static int ssl_puts(BIO *bp, const char *str)
      {
      int n,ret;

      n=strlen(str);
      ret=BIO_write(bp,str,n);
      return(ret);
      }

BIO *BIO_new_buffer_ssl_connect(SSL_CTX *ctx)
      {
#ifndef OPENSSL_NO_SOCK
      BIO *ret=NULL,*buf=NULL,*ssl=NULL;

      if ((buf=BIO_new(BIO_f_buffer())) == NULL)
            return(NULL);
      if ((ssl=BIO_new_ssl_connect(ctx)) == NULL)
            goto err;
      if ((ret=BIO_push(buf,ssl)) == NULL)
            goto err;
      return(ret);
err:
      if (buf != NULL) BIO_free(buf);
      if (ssl != NULL) BIO_free(ssl);
#endif
      return(NULL);
      }

BIO *BIO_new_ssl_connect(SSL_CTX *ctx)
      {
      BIO *ret=NULL,*con=NULL,*ssl=NULL;

      if ((con=BIO_new(BIO_s_connect())) == NULL)
            return(NULL);
      if ((ssl=BIO_new_ssl(ctx,1)) == NULL)
            goto err;
      if ((ret=BIO_push(ssl,con)) == NULL)
            goto err;
      return(ret);
err:
      if (con != NULL) BIO_free(con);
      if (ret != NULL) BIO_free(ret);
      return(NULL);
      }

BIO *BIO_new_ssl(SSL_CTX *ctx, int client)
      {
      BIO *ret;
      SSL *ssl;

      if ((ret=BIO_new(BIO_f_ssl())) == NULL)
            return(NULL);
      if ((ssl=SSL_new(ctx)) == NULL)
            {
            BIO_free(ret);
            return(NULL);
            }
      if (client)
            SSL_set_connect_state(ssl);
      else
            SSL_set_accept_state(ssl);
            
      BIO_set_ssl(ret,ssl,BIO_CLOSE);
      return(ret);
      }

int BIO_ssl_copy_session_id(BIO *t, BIO *f)
      {
      t=BIO_find_type(t,BIO_TYPE_SSL);
      f=BIO_find_type(f,BIO_TYPE_SSL);
      if ((t == NULL) || (f == NULL))
            return(0);
      if (  (((BIO_SSL *)t->ptr)->ssl == NULL) || 
            (((BIO_SSL *)f->ptr)->ssl == NULL))
            return(0);
      SSL_copy_session_id(((BIO_SSL *)t->ptr)->ssl,((BIO_SSL *)f->ptr)->ssl);
      return(1);
      }

void BIO_ssl_shutdown(BIO *b)
      {
      SSL *s;

      while (b != NULL)
            {
            if (b->method->type == BIO_TYPE_SSL)
                  {
                  s=((BIO_SSL *)b->ptr)->ssl;
                  SSL_shutdown(s);
                  break;
                  }
            b=b->next_bio;
            }
      }

Generated by  Doxygen 1.6.0   Back to index