heimdal/lib/otp/otp_db.c

#ifdef HAVE_CONFIG_H
#include "config.h"
RCSID("$Id$");
#endif

#include "otp_locl.h"

static int
get_filename (char *user, char *buf, size_t len)
{
  struct passwd *pwd;

  pwd = getpwnam (user);
  if (pwd == NULL)
    return -1;

  strncpy (buf, pwd->pw_dir, len);
  buf[len - 1] = '\0';
  strncat (buf, OTPKEYS, len - strlen(buf));
  buf[len - 1] = '\0';
  return 0;
}

static FILE *
open_file (char *user, char *mode)
{
  char fname[BUFSIZ];
  
  if (get_filename (user, fname, sizeof(fname)))
    return NULL;
  return fopen (fname, mode);
}

void *
otp_db_open ()
{
  DBM *ret;
  int lock;

  do {
    struct stat statbuf;
    lock = open (OTP_DB_LOCK, O_WRONLY | O_CREAT | O_EXCL, 0666);
    if (lock >= 0) {
      close(lock);
      break;
    }
    if (stat (OTP_DB_LOCK, &statbuf) < 0)
      if (errno == ENOENT)
	continue;
      else
	return NULL;
    if (time(NULL) - statbuf.st_mtime > OTP_DB_TIMEOUT)
      unlink (OTP_DB_LOCK);
  } while(1);
  return dbm_open (OTP_DB, O_RDWR | O_CREAT, 0600);
}

void
otp_db_close (void *dbm)
{
  dbm_close ((DBM *)dbm);
  unlink (OTP_DB_LOCK);
}

#if 0
int
otp_put (OtpContext *ctx)
{
  FILE *f;
  char s[32];

  f = open_file (ctx->user, "w");
  if (f == NULL)
    return -1;
  otp_print_hex (ctx->key, s);
  if(fprintf (f, "%s %u %s %s\n", ctx->alg->name, ctx->n, ctx->seed, s)
     < 0) {
    fclose (f);
    return -1;
  }
  if(fclose (f))
    return -1;
  return 0;
}
#endif

/*
 * Read this entry from the database and lock it.
 */

int
otp_get (void *v, OtpContext *ctx)
{
  DBM *dbm = (DBM *)v;
  datum dat, key;
  unsigned char *p;
  time_t now, then;

  key.dsize = strlen(ctx->user);
  key.dptr  = ctx->user;

  dat = dbm_fetch (dbm, key);
  if (dat.dptr == NULL)
    return -1;
  p = dat.dptr;
  time(&now);
  memcpy (&then, p, sizeof(then));
  if (then && now - then < OTP_USER_TIMEOUT)
    return -1;
  memcpy (p, &now, sizeof(now));
  p += sizeof(now);
  ctx->alg = otp_find_alg (p);
  if (ctx->alg == NULL)
    return -1;
  p += strlen(p) + 1;
  ctx->n = (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3];
  p += 4;
  memcpy (ctx->key, p, OTPKEYSIZE);
  p += OTPKEYSIZE;
  strncpy (ctx->seed, p, sizeof(ctx->seed));
  ctx->seed[sizeof(ctx->seed) - 1] = '\0';
  return dbm_store (dbm, key, dat, DBM_REPLACE);
}

/*
 * Write this entry to the database.
 */

int
otp_put (void *v, OtpContext *ctx)
{
  DBM *dbm = (DBM *)v;
  datum dat, key;
  unsigned char buf[1024], *p;
  time_t zero = 0;

  key.dsize = strlen(ctx->user);
  key.dptr  = ctx->user;

  p = buf;
  memcpy (p, &zero, sizeof(zero));
  p += sizeof(zero);
  strcpy (p, ctx->alg->name);
  p += strlen(p) + 1;
  *p++ = (ctx->n >> 24) & 0xFF;
  *p++ = (ctx->n >> 16) & 0xFF;
  *p++ = (ctx->n >>  8) & 0xFF;
  *p++ = (ctx->n >>  0) & 0xFF;
  memcpy (p, ctx->key, OTPKEYSIZE);
  p += OTPKEYSIZE;
  strcpy (p, ctx->seed);
  p += strlen(p) + 1;
  dat.dptr  = buf;
  dat.dsize = p - buf;
  return dbm_store (dbm, key, dat, DBM_REPLACE);
}


#if 0
int
otp_get (OtpContext *ctx)
{
  FILE *f;
  char buf[BUFSIZ];
  char *p, *pend;

  f = open_file (ctx->user, "r");
  if (f == NULL)
    return -1;
  if (fgets (buf, sizeof(buf), f) == NULL) {
    fclose (f);
    return -1;
  }
  fclose (f);

  p = buf;
  pend = strchr (buf, ' ');
  if (pend == NULL)
    return -1;
  *pend++ = '\0';
  ctx->alg = otp_find_alg (p);
  if (ctx->alg == NULL)
    return -1;
  p = pend;
  if (sscanf (p, "%u", &ctx->n) != 1)
    return -1;
  pend = strchr (p, ' ');
  if (pend == NULL)
    return -1;
  *pend++ = '\0';
  p = pend;
  pend = strchr (p, ' ');
  if (pend == NULL)
    return -1;
  *pend++ = '\0';
  strncpy (ctx->seed, p, sizeof(ctx->seed));
  ctx->seed[sizeof(ctx->seed) - 1] = '\0';
  if (ctx->seed == NULL)
    return -1;
  p = pend;
  if(otp_parse (ctx->key, p))
    return -1;
  return 0;
}
#endif