Renamed from `rsa-decrypt', since the name was no longer appropriate.

[u/mdw/catacomb] / pixie-client.c

/* -*-c-*-
 *
 * $Id: pixie-client.c,v 1.2 2000/06/17 11:49:37 mdw Exp $
 *
 * Simple passphrase pixie client (Unix-specific)
 *
 * (c) 1999 Straylight/Edgeware
 */

/*----- Licensing notice --------------------------------------------------* 
 *
 * This file is part of Catacomb.
 *
 * Catacomb is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Library General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 * 
 * Catacomb is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Library General Public License for more details.
 * 
 * You should have received a copy of the GNU Library General Public
 * License along with Catacomb; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA 02111-1307, USA.
 */

/*----- Revision history --------------------------------------------------* 
 *
 * $Log: pixie-client.c,v $
 * Revision 1.2  2000/06/17 11:49:37  mdw
 * New pixie protocol allowing application to request passphrases and send
 * them to the pixie.
 *
 * Revision 1.1  1999/12/22 15:58:41  mdw
 * Passphrase pixie support.
 *
 */

/*----- Header files ------------------------------------------------------*/

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#include <pwd.h>

#include <sys/socket.h>
#include <sys/un.h>

#include <mLib/dstr.h>
#include <mLib/fdflags.h>
#include <mLib/str.h>

#include "passphrase.h"
#include "pixie.h"

/*----- Main code ---------------------------------------------------------*/

/* --- @pixie_open@ --- *
 *
 * Arguments:	@const char *sock@ = path to pixie socket
 *
 * Returns:	Less than zero if it failed, or file descriptor.
 *
 * Use:		Opens a connection to a passphrase pixie.
 */

int pixie_open(const char *sock)
{
  struct sockaddr_un *sun;
  size_t sz;
  int fd;

  /* --- Open the connection --- */

  if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
    goto fail_0;
  sun = pixie_address(sock, &sz);
  if (connect(fd, (struct sockaddr *)sun, sz))
    goto fail_1;
  free(sun);
  return (fd);

  /* --- Tidy up if things went wrong --- */

fail_1:
  free(sun);
  close(fd);
fail_0:
  return (-1);
}

/* --- @pixie_read@ --- *
 *
 * Arguments:	@int fd@ = connection to passphrase pixie
 *		@const char *tag@ = pointer to tag string
 *		@unsigned mode@ = reading mode
 *		@char *buf@ = pointer to destination buffer
 *		@size_t sz@ = size of the buffer
 *
 * Returns:	Zero if all went well, @-1@ if the read fails, @+1@ to
 *		request the passphrase from the user.
 *
 * Use:		Reads a passphrase from the pixie.
 */

int pixie_read(int fd, const char *tag, unsigned mode, char *buf, size_t sz)
{
  dstr d = DSTR_INIT;
  char *p, *q;

  /* --- Send the request --- */

  dstr_putf(&d, "%s %s\n", mode == PMODE_READ ? "PASS" : "VERIFY", tag);
  write(fd, d.buf, d.len);
  dstr_destroy(&d);

  /* --- Sort out the result --- */

again:
  pixie_fdline(fd, buf, sz);
  p = buf;
  if ((q = str_getword(&p)) == 0)
    return (-1);
  if (strcmp(q, "INFO") == 0)
    goto again;
  else if (strcmp(q, "MISSING") == 0)
    return (+1);
  else if (strcmp(q, "OK") != 0)
    return (-1);

  /* --- Return the final answer --- */

  if (p)
    memmove(buf, p, strlen(p) + 1);
  else
    *buf = 0;
  return (0);
}

/* --- @pixie_set@ --- *
 *
 * Arguments:	@int fd@ = pixie file descriptor
 *		@const char *tag@ = pointer to tag string
 *		@const char *phrase@ = pointer to passphrase string
 *
 * Returns:	---
 *
 * Use:		Sends a passphrase to the passphrase pixie.
 */

void pixie_set(int fd, const char *tag, const char *phrase)
{
  dstr d = DSTR_INIT;
  char buf[16];
  size_t sz = strlen(phrase);
  char nl = '\n';
  char *p, *q;

  /* --- Send the request --- *
   *
   * I didn't want to copy it out of the caller's buffer.  @writev@ may
   * produce a copy, too, so I didn't do that either.
   */

  dstr_putf(&d, "SET %s -- ", tag);
  write(fd, d.buf, d.len);
  write(fd, phrase, sz);
  write(fd, &nl, 1);
  dstr_destroy(&d);

  /* --- Pick up the pieces --- */

again:
  pixie_fdline(fd, buf, sizeof(buf));
  p = buf;
  if ((q = str_getword(&p)) != 0 && strcmp(q, "INFO") == 0)
    goto again;
}

/* --- @pixie_cancel@ --- *
 *
 * Arguments:	@int fd@ = pixie file descriptor
 *		@const char *tag@ = pointer to tag string
 *
 * Returns:	---
 *
 * Use:		Cancels a passphrase if it turns out to be bogus.
 */

void pixie_cancel(int fd, const char *tag)
{
  dstr d = DSTR_INIT;
  char buf[16];
  char *p, *q;

  /* --- Send the request --- */

  dstr_putf(&d, "FLUSH %s\n", tag);
  write(fd, d.buf, d.len);
  dstr_destroy(&d);

  /* --- Sort out the result --- */

again:
  pixie_fdline(fd, buf, sizeof(buf));
  p = buf;
  if ((q = str_getword(&p)) != 0 && strcmp(q, "INFO") == 0)
    goto again;
}

/*----- That's all, folks -------------------------------------------------*/