kerb_w2k.c

广泛使用的邮件服务器！同时

					      *context_handle,&obufs,
					      ret_flags ? ret_flags : &i,
					      &expiry);
  }
				/* return output */
  output_token->value = obuf[0].pvBuffer;
  output_token->length = obuf[0].cbBuffer;
				/* in case client wanted lifetime returned */
  if (time_rec) *time_rec = expiry.LowPart;
  return major_status;
}

/* GSSAPI display status text
 * Accepts: pointer to return minor status
 *	    status to display
 *	    status type
 *	    message context for continuation
 *	    buffer to write status string
 * Returns: major status, always
 */

OM_uint32 gss_display_status (OM_uint32 *minor_status,OM_uint32 status_value,
			      int status_type,gss_OID mech_type,
			      OM_uint32 *message_context,
			      gss_buffer_t status_string)
{
  char *s,tmp[MAILTMPLEN];
  *minor_status = 0;		/* never any minor status */
  if (*message_context) return GSS_S_FAILURE;
  switch (status_type) {	/* what type of status code? */
  case GSS_C_GSS_CODE:		/* major_status */
    switch (status_value) {	/* analyze status value */
    case GSS_S_FAILURE:
      s = "Unspecified failure"; break;
    case GSS_S_CREDENTIALS_EXPIRED:
      s = "Credentials expired"; break;
    case GSS_S_BAD_BINDINGS:
      s = "Bad bindings"; break;
    case GSS_S_BAD_MECH:
      s = "Bad mechanism type"; break;
    case GSS_S_BAD_NAME:
      s = "Bad name"; break;
    case GSS_S_BAD_NAMETYPE:
      s = "Bad name type"; break;
    case GSS_S_BAD_STATUS:
      s = "Bad status"; break;
    case GSS_S_NO_CONTEXT:
      s = "Invalid context handle"; break;
    case GSS_S_NO_CRED:
      s = "Unable to authenticate to Kerberos service";
      mail_parameters (NIL,DISABLE_AUTHENTICATOR,"GSSAPI");
      break;
    case SEC_E_NO_AUTHENTICATING_AUTHORITY:
      s = "No authenticating authority"; break;
    case SEC_E_TARGET_UNKNOWN:
      s = "Destination server unknown to Kerberos service"; break;
    default:
      sprintf (s = tmp,"SSPI code %lx",status_value);
    }
    break;
  case GSS_C_MECH_CODE:		/* minor status - drop into default */
  default:
    return GSS_S_BAD_STATUS;	/* bad status type */
  }
				/* return status string */
  status_string->length = strlen (status_string->value = cpystr (s));
  return GSS_S_COMPLETE;
}

/* GSSAPI delete security context
 * Accepts: pointer to return minor status
 *	    context to delete
 *	    output context token
 * Returns: major status, always
 */

OM_uint32 gss_delete_sec_context (OM_uint32 *minor_status,
				  gss_ctx_id_t *context_handle,
				  gss_buffer_t output_token)
{
  OM_uint32 major_status;
  *minor_status = 0;		/* never any minor status */
				/* output token not supported */
  major_status = output_token ? GSS_S_FAILURE :
    DeleteSecurityContext (*context_handle);
  fs_give ((void **) context_handle);
  return major_status;
}


/* GSSAPI release buffer
 * Accepts: pointer to return minor status
 *	    buffer to release
 * Returns: GSS_S_COMPLETE, always
 */

OM_uint32 gss_release_buffer (OM_uint32 *minor_status,gss_buffer_t buffer)
{
  *minor_status = 0;		/* never any minor status */
  fs_give (&buffer->value);
  return GSS_S_COMPLETE;
}


/* GSSAPI release name
 * Accepts: pointer to return minor status
 *	    pointer to name to release
 * Returns: GSS_S_COMPLETE, always
 */

OM_uint32 gss_release_name (OM_uint32 *minor_status,gss_name_t *input_name)
{
  *minor_status = 0;		/* never any minor status */
  fs_give (input_name);
  return GSS_S_COMPLETE;
}

/* GSSAPI wrap data
 * Accepts: pointer to return minor status
 *	    context handle
 *	    requested confidentiality
 *	    requested quality of protection
 *	    input message buffer
 *	    pointer to return confidentiality state
 *	    output message buffer
 * Returns: major status, always
 */

OM_uint32 gss_wrap (OM_uint32 *minor_status,gss_ctx_id_t context_handle,
		    int conf_req_flag,gss_qop_t qop_req,
		    gss_buffer_t input_message_buffer,int *conf_state,
		    gss_buffer_t output_message_buffer)
{
  OM_uint32 major_status;
  SecBuffer buf[3];
  SecBufferDesc bufs;
  SecPkgContext_Sizes sizes;
  *minor_status = NIL;		/* never any minor status */
  *conf_state = conf_req_flag;	/* same as requested */
  if ((major_status =		/* get trailer and padding sizes */
       QueryContextAttributes (context_handle,SECPKG_ATTR_SIZES,&sizes)) ==
      SEC_E_OK) {
				/* create big enough output buffer */
    output_message_buffer->value =
      fs_get (sizes.cbSecurityTrailer + input_message_buffer->length +
	      sizes.cbBlockSize);
    /* MSDN claims that for EncryptMessage() in Kerberos, you need an
     * uninitialized SECBUFFER_STREAM_HEADER; a SECBUFFER_DATA that "contains
     * the message to be encrypted.  The message is encrypted in place,
     * overwriting the original contents of its buffer"; an uninitialized
     * SECBUFFER_STREAM_TRAILER, and an uninitialized SECBUFFER_EMPTY.  I've
     * never been able to get it to work that way.
     */
    bufs.cBuffers = 3;		/* set up buffer descriptor */
    bufs.pBuffers = buf;
    bufs.ulVersion = SECBUFFER_VERSION;
    buf[0].BufferType = SECBUFFER_TOKEN;
    buf[0].pvBuffer = output_message_buffer->value;
    buf[0].cbBuffer = sizes.cbSecurityTrailer;
				/* I/O buffer */
    buf[1].BufferType = SECBUFFER_DATA;
    buf[1].pvBuffer = ((char *) buf[0].pvBuffer) + buf[0].cbBuffer;
    buf[1].cbBuffer = input_message_buffer->length;
    memcpy (buf[1].pvBuffer,input_message_buffer->value,buf[1].cbBuffer);
    buf[2].BufferType = SECBUFFER_PADDING;
    buf[2].pvBuffer = ((char *) buf[1].pvBuffer) + buf[1].cbBuffer;
    buf[2].cbBuffer = sizes.cbBlockSize;
    if ((major_status = EncryptMessage (context_handle,qop_req,&bufs,0)) ==
	GSS_S_COMPLETE) {
				/* slide data as necessary (how annoying!) */
      unsigned long i = sizes.cbSecurityTrailer - buf[0].cbBuffer;
      if (i) buf[1].pvBuffer =
	       memmove (((char *) buf[0].pvBuffer) + buf[0].cbBuffer,
			buf[1].pvBuffer,buf[1].cbBuffer);
      if (i += (input_message_buffer->length - buf[1].cbBuffer))
	buf[1].pvBuffer = memmove (((char *)buf[1].pvBuffer) + buf[1].cbBuffer,
		   buf[2].pvBuffer,buf[2].cbBuffer);
      output_message_buffer->length = buf[0].cbBuffer + buf[1].cbBuffer +
	buf[2].cbBuffer;
    }
    else fs_give (&output_message_buffer->value);
  }
  return major_status;		/* return status */
}

/* GSSAPI unwrap data
 * Accepts: pointer to return minor status
 *	    context handle
 *	    input message buffer
 *	    output message buffer
 *	    pointer to return confidentiality state
 *	    pointer to return quality of protection
 * Returns: major status, always
 */

OM_uint32 gss_unwrap (OM_uint32 *minor_status,gss_ctx_id_t context_handle,
		      gss_buffer_t input_message_buffer,
		      gss_buffer_t output_message_buffer,int *conf_state,
		      gss_qop_t *qop_state)
{
  OM_uint32 major_status;
  SecBuffer buf[2];
  SecBufferDesc bufs;
  *minor_status = NIL;		/* never any minor status */
  *conf_state = NIL;		/* or confidentiality state */
  /* MSDN implies that all that is needed for DecryptMessage() in Kerberos
   * is a single SECBUFFER_DATA which "contains the encrypted message.  The
   * encrypted message is decrypted in place, overwriting the original
   * contents of its buffer."  I've never been able to get it to work without
   * using a SECBUFFER_STREAM for input and an uninitialized SECBUFFER_DATA
   * for output.
   * It *does* overwrite the input buffer, but not at the same point; e.g.
   * with an input pointer of 0xa140a8 and size of 53, the output ends up
   * at 0xa140d5 and size of 4.
   */
  bufs.cBuffers = 2;		/* set up buffer descriptor */
  bufs.pBuffers = buf;
  bufs.ulVersion = SECBUFFER_VERSION;
				/* input buffer */
  buf[0].BufferType = SECBUFFER_STREAM;
  buf[0].pvBuffer = input_message_buffer->value;
  buf[0].cbBuffer = input_message_buffer->length;
				/* output buffer */
  buf[1].BufferType = SECBUFFER_DATA;
  buf[1].pvBuffer = NIL;
  buf[1].cbBuffer = 0;
				/* decrypt and copy to output buffer */
  if ((major_status = DecryptMessage (context_handle,&bufs,0,qop_state)) ==
      SEC_E_OK)
   memcpy (output_message_buffer->value = fs_get (buf[1].cbBuffer),
	   buf[1].pvBuffer,output_message_buffer->length = buf[1].cbBuffer);
  return major_status;		/* return status */
}

/* From here on are server-only functions, currently unused */


/* GSSAPI acquire credentials
 * Accepts: pointer to return minor status
 *	    desired principal
 *	    desired lifetime
 *	    desired mechanisms
 *	    credentials usage
 *	    pointer to return credentials handle
 *	    pointer to return mechanisms
 *	    pointer to return lifetime
 * Returns: GSS_S_FAILURE, always
 */

OM_uint32 gss_acquire_cred (OM_uint32 *minor_status,gss_name_t desired_name,
			    OM_uint32 time_req,gss_OID_set desired_mechs,
			    gss_cred_usage_t cred_usage,
			    gss_cred_id_t *output_cred_handle,
			    gss_OID_set *actual_mechs,OM_uint32 *time_rec)
{
  *minor_status = 0;		/* never any minor status */
  return GSS_S_FAILURE;		/* server only */
}


/* GSSAPI release credentials
 * Accepts: pointer to return minor status
 *	    credentials handle to free
 * Returns: GSS_S_COMPLETE, always
 */

OM_uint32 gss_release_cred (OM_uint32 *minor_status,gss_cred_id_t *cred_handle)
{
  *minor_status = 0;		/* never any minor status */
  return GSS_S_FAILURE;		/* server only */
}

/* GSSAPI Accept security context
 * Accepts: pointer to return minor status
 *	    context
 *	    acceptor credentials
 *	    input token buffer
 *	    input channel bindings
 *	    pointer to return source name
 *	    pointer to return mechanism type
 *	    buffer to return output token
 *	    pointer to return flags
 *	    pointer to return context lifetime
 *	    pointer to return delegated credentials
 * Returns: GSS_S_FAILURE, always
 */

OM_uint32 gss_accept_sec_context (OM_uint32 *minor_status,
				  gss_ctx_id_t *context_handle,
				  gss_cred_id_t acceptor_cred_handle,
				  gss_buffer_t input_token_buffer,
				  gss_channel_bindings_t input_chan_bindings,
				  gss_name_t *src_name,gss_OID *mech_type,
				  gss_buffer_t output_token,
				  OM_uint32 *ret_flags,OM_uint32 *time_rec,
				  gss_cred_id_t *delegated_cred_handle)
{
  *minor_status = 0;		/* never any minor status */
  return GSS_S_FAILURE;		/* server only */
}


/* GSSAPI return printable name
 * Accepts: pointer to return minor status
 *	    internal name
 *	    buffer to return output name
 *	    output name type
 * Returns: GSS_S_FAILURE, always
 */

OM_uint32 gss_display_name (OM_uint32 *minor_status,gss_name_t input_name,
			    gss_buffer_t output_name_buffer,
			    gss_OID *output_name_type)
{
  *minor_status = 0;		/* never any minor status */
  return GSS_S_FAILURE;		/* server only */
}

/* Kerberos server valid check
 * Returns: T if have keytab, NIL otherwise
 */

long kerberos_server_valid ()
{
  return NIL;
}


/* Kerberos check for missing or expired credentials
 * Returns: T if should suggest running kinit, NIL otherwise
 */

long kerberos_try_kinit (OM_uint32 error)
{
  return NIL;
}

/* Kerberos server log in
 * Accepts: authorization ID as user name
 *	    authentication ID as Kerberos principal
 *	    argument count
 *	    argument vector
 * Returns: logged in user name if logged in, NIL otherwise
 */

char *kerberos_login (char *user,char *authuser,int argc,char *argv[])
{
  return NIL;
}