rework the password subsystem

[unix-history] / usr / src / usr.bin / chpass / field.c

/*
* Copyright (c) 1988 The Regents of the University of California.
* All rights reserved.
*
* %sccs.include.redist.c%
*/

#ifndef lint
static char sccsid[] = "@(#)field.c     5.13 (Berkeley) %G%";
#endif /* not lint */

#include <sys/param.h>
#include <pwd.h>
#include <grp.h>
#include <string.h>
#include <stdio.h>
#include <ctype.h>
#include "chpass.h"
#include "pathnames.h"

/* ARGSUSED */
p_login(p, pw, ep)
       char *p;
       struct passwd *pw;
       ENTRY *ep;
{
       if (!*p) {
               (void)fprintf(stderr, "chpass: empty login field.\n");
               return(1);
       }
       if (*p == '-') {
               (void)fprintf(stderr,
                   "chpass: login names may not begin with a hyphen.\n");
               return(1);
       }
       if (!(pw->pw_name = strdup(p))) {
               (void)fprintf(stderr, "chpass: can't save entry.\n");
               return(1);
       }
       if (index(p, '.'))
               (void)fprintf(stderr,
                   "chpass: \'.\' is dangerous in a login name.\n");
       for (; *p; ++p)
               if (isupper(*p)) {
                       (void)fprintf(stderr,
                           "chpass: upper-case letters are dangerous in a login name.\n");
                       break;
               }
       return(0);
}

/* ARGSUSED */
p_passwd(p, pw, ep)
       char *p;
       struct passwd *pw;
       ENTRY *ep;
{
       if (!*p)
               pw->pw_passwd = "";     /* "NOLOGIN"; */
       else if (!(pw->pw_passwd = strdup(p))) {
               (void)fprintf(stderr, "chpass: can't save password entry.\n");
               return(1);
       }
       
       return(0);
}

/* ARGSUSED */
p_uid(p, pw, ep)
       register char *p;
       struct passwd *pw;
       ENTRY *ep;
{
       int id;

       if (!*p) {
               (void)fprintf(stderr, "chpass: empty uid field.\n");
               return(1);
       }
       if (!isdigit(*p)) {
               (void)fprintf(stderr, "chpass: illegal uid.\n");
               return(1);
       }
       id = atoi(p);
       if ((u_int)id > USHRT_MAX) {
               (void)fprintf(stderr, "chpass: %d > max uid value (%d).\n",
                   id, USHRT_MAX);
               return(1);
       }
       pw->pw_uid = id;
       return(0);
}

/* ARGSUSED */
p_gid(p, pw, ep)
       register char *p;
       struct passwd *pw;
       ENTRY *ep;
{
       struct group *gr;
       int id;

       if (!*p) {
               (void)fprintf(stderr, "chpass: empty gid field.\n");
               return(1);
       }
       if (!isdigit(*p)) {
               if (!(gr = getgrnam(p))) {
                       (void)fprintf(stderr,
                           "chpass: unknown group %s.\n", p);
                       return(1);
               }
               pw->pw_gid = gr->gr_gid;
               return(0);
       }
       id = atoi(p);
       if ((u_int)id > USHRT_MAX) {
               (void)fprintf(stderr, "chpass: %d > max gid value (%d).\n",
                   id, USHRT_MAX);
               return(1);
       }
       pw->pw_gid = id;
       return(0);
}

/* ARGSUSED */
p_class(p, pw, ep)
       char *p;
       struct passwd *pw;
       ENTRY *ep;
{
       if (!*p)
               pw->pw_class = "";
       else if (!(pw->pw_class = strdup(p))) {
               (void)fprintf(stderr, "chpass: can't save entry.\n");
               return(1);
       }
       
       return(0);
}

/* ARGSUSED */
p_change(p, pw, ep)
       char *p;
       struct passwd *pw;
       ENTRY *ep;
{
       if (!atot(p, &pw->pw_change))
               return(0);
       (void)fprintf(stderr, "chpass: illegal date for change field.\n");
       return(1);
}

/* ARGSUSED */
p_expire(p, pw, ep)
       char *p;
       struct passwd *pw;
       ENTRY *ep;
{
       if (!atot(p, &pw->pw_expire))
               return(0);
       (void)fprintf(stderr, "chpass: illegal date for expire field.\n");
       return(1);
}

/* ARGSUSED */
p_gecos(p, pw, ep)
       char *p;
       struct passwd *pw;
       ENTRY *ep;
{
       if (!*p)
               ep->save = "";
       else if (!(ep->save = strdup(p))) {
               (void)fprintf(stderr, "chpass: can't save entry.\n");
               return(1);
       }
       return(0);
}

/* ARGSUSED */
p_hdir(p, pw, ep)
       char *p;
       struct passwd *pw;
       ENTRY *ep;
{
       if (!*p) {
               (void)fprintf(stderr, "chpass: empty home directory field.\n");
               return(1);
       }
       if (!(pw->pw_dir = strdup(p))) {
               (void)fprintf(stderr, "chpass: can't save entry.\n");
               return(1);
       }
       return(0);
}

/* ARGSUSED */
p_shell(p, pw, ep)
       register char *p;
       struct passwd *pw;
       ENTRY *ep;
{
       char *t, *ok_shell();

       if (!*p) {
               pw->pw_shell = _PATH_BSHELL;
               return(0);
       }
       /* only admin can change from or to "restricted" shells */
       if (uid && pw->pw_shell && !ok_shell(pw->pw_shell)) {
               (void)fprintf(stderr,
                   "chpass: %s: current shell non-standard.\n", pw->pw_shell);
               return(1);
       }
       if (!(t = ok_shell(p))) {
               if (uid) {
                       (void)fprintf(stderr,
                           "chpass: %s: non-standard shell.\n", p);
                       return(1);
               }
       }
       else
               p = t;
       if (!(pw->pw_shell = strdup(p))) {
               (void)fprintf(stderr, "chpass: can't save entry.\n");
               return(1);
       }
       return(0);
}