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pw.c

/* 
   Copyright (c) 1995-2000 by Cisco systems, Inc.

   Permission to use, copy, modify, and distribute modified and
   unmodified copies of this software for any purpose and without fee is
   hereby granted, provided that (a) this copyright and permission notice
   appear on all copies of the software and supporting documentation, (b)
   the name of Cisco Systems, Inc. not be used in advertising or
   publicity pertaining to distribution of the program without specific
   prior permission, and (c) notice be given in supporting documentation
   that use, modification, copying and distribution is by permission of
   Cisco Systems, Inc.

   Cisco Systems, Inc. makes no representations about the suitability
   of this software for any purpose.  THIS SOFTWARE IS PROVIDED ``AS
   IS'' AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
   WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
   FITNESS FOR A PARTICULAR PURPOSE.
*/

/* Tacacs+ password lookup routine for those systems which don't have
   setpwfile. Not for use on /etc/passwd files */

#include "tac_plus.h"
#include <pwd.h>
#include <string.h>

static struct passwd pw_passwd;

struct passwd *
tac_passwd_lookup(name, file)
    char *name, *file;
{
    FILE *passwd_fp = NULL;

    static char uname[512];
    static char password[1024];
    static char gecos[1024];
    static char homedir[1024];
    static char shell[1024];
    char buf[1024];
    char *s, *e;

    passwd_fp = fopen(file, "r");

    if (passwd_fp) {
      if (debug & DEBUG_PASSWD_FLAG)
          report(LOG_DEBUG, "tac_passwd_lookup: open %s %d", 
               file, fileno(passwd_fp));
    } else {
      report(LOG_ERR, "tac_passwd_lookup: cannot open file %s for reading", 
             file);
      return(NULL);
    }

    while (fgets(buf, sizeof(buf), passwd_fp)) {

      /* uname, password, uid, gid, gecos, homedir, shell */

      s = buf;
      e = index(buf, ':');
      if (!e)
          break;

      strncpy(uname, s, e - s);
      uname[e - s] = '\0';

      /* try next entry */
      if (strcmp(uname, name))
          continue;

      s = e + 1;
      e = index(s, ':');
      if (!e) {
          break;
      }
      strncpy(password, s, e - s);
      password[e - s] = '\0';

      s = e + 1;
      e = index(s, ':');
      if (!e) {
          break;
      }
      pw_passwd.pw_uid = atoi(s);

      s = e + 1;
      e = index(s, ':');
      pw_passwd.pw_gid = atoi(s);

      s = e + 1;
      e = index(s, ':');
      if (!e) {
          break;
      }
      strncpy(gecos, s, e - s);
      gecos[e - s] = '\0';

      s = e + 1;
      e = index(s, ':');
      if (!e) {
          break;
      }
      strncpy(homedir, s, e - s);
      homedir[e - s] = '\0';

      s = e + 1;
      e = index(s, '\n');
      if (!e) {
          break;
      }
      strncpy(shell, s, e - s);
      shell[e - s] = '\0';

        pw_passwd.pw_name    = uname;
        pw_passwd.pw_passwd  = password;
#ifndef NO_PWAGE
        pw_passwd.pw_age     = NULL;
        pw_passwd.pw_comment = NULL;
#endif /* NO_PWAGE */
        pw_passwd.pw_gecos   = gecos;
        pw_passwd.pw_dir     = homedir;
        pw_passwd.pw_shell   = shell;

      if (debug & DEBUG_PASSWD_FLAG)
          report(LOG_DEBUG, "tac_passwd_lookup: close %s %d", 
               file, fileno(passwd_fp));
      fclose(passwd_fp);
      return(&pw_passwd);
    }

    /* no match found */
    if (debug & DEBUG_PASSWD_FLAG)
          report(LOG_DEBUG, "tac_passwd_lookup: close %s %d", 
               file, fileno(passwd_fp));
    fclose(passwd_fp);
    return(NULL);
}

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