lib/passwdutil/utils.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#include <sys/types.h>
#include <sys/time.h>
#include <string.h>
#include <thread.h>
#include <unistd.h>
#include <stdlib.h>
#include <crypt.h>
#include <pwd.h>
#include <shadow.h>

#include <deflt.h>

#include "passwdutil.h"

#define PWADMIN "/etc/default/passwd"

#define MINWEEKS    -1
#define MAXWEEKS    -1
#define WARNWEEKS   -1

extern repops_t files_repops, nis_repops, ldap_repops, nss_repops;

repops_t *rops[REP_LAST+1] = {
    NULL,
    &files_repops,
    &nis_repops,
    NULL,
    &ldap_repops,
    NULL,
    NULL,
    NULL,
    &nss_repops,
};

void
free_pwd(struct passwd *pw)
{
    if (pw->pw_name) free(pw->pw_name);
    if (pw->pw_passwd) free(pw->pw_passwd);
    if (pw->pw_gecos) free(pw->pw_gecos);
    if (pw->pw_dir) free(pw->pw_dir);
    if (pw->pw_shell) free(pw->pw_shell);
    free(pw);
}

void
free_spwd(struct spwd *spw)
{
    if (spw->sp_namp) free(spw->sp_namp);
    if (spw->sp_pwdp) free(spw->sp_pwdp);
    free(spw);
}

int
dup_pw(struct passwd **d, struct passwd *s)
{
    if (s == NULL) {
        *d = NULL;
        return (PWU_NOT_FOUND);
    }
    if ((*d = calloc(1, sizeof (**d))) == NULL)
        return (PWU_NOMEM);

    if (s->pw_name) {
        if (((*d)->pw_name = strdup(s->pw_name)) == NULL)
            goto no_mem;
    }
    if (s->pw_passwd) {
        if (((*d)->pw_passwd = strdup(s->pw_passwd)) == NULL)
            goto no_mem;
    }
    (*d)->pw_uid = s->pw_uid;
    (*d)->pw_gid = s->pw_gid;

    if (s->pw_gecos) {
        if (((*d)->pw_gecos = strdup(s->pw_gecos)) == NULL)
            goto no_mem;
    }
    if (s->pw_dir) {
        if (((*d)->pw_dir = strdup(s->pw_dir)) == NULL)
            goto no_mem;
    }
    if (s->pw_shell) {
        if (((*d)->pw_shell = strdup(s->pw_shell)) == NULL)
            goto no_mem;
    }

    return (PWU_SUCCESS);

no_mem:
    free_pwd(*d);
    *d = NULL;
    return (PWU_NOMEM);
}

int
dup_spw(struct spwd **d, struct spwd *s)
{
    if (s == NULL) {
        *d = NULL;
        return (PWU_NOT_FOUND);
    }
    if ((*d = calloc(1, sizeof (**d))) == NULL)
        return (PWU_NOMEM);

    **d = *s;

    if (s->sp_namp)
        if (((*d)->sp_namp = strdup(s->sp_namp)) == NULL)
            goto no_mem;
    if (s->sp_pwdp)
        if (((*d)->sp_pwdp = strdup(s->sp_pwdp)) == NULL)
            goto no_mem;
    return (PWU_SUCCESS);

no_mem:
    free_spwd(*d);
    return (PWU_NOMEM);
}

/*
 * read a value from the defaults file, and return it if it is
 * a positive integer. If the value is not defined, or negative,
 * return the supplied default value
 */
int
def_getuint(char *name, int defvalue, void *defp)
{
    char *p;
    int val = -1;   /* -1 is a guard to catch undefined values */

    if ((p = defread_r(name, defp)) != NULL)
        val = atoi(p);

    return (val >= 0 ? val : defvalue);
}

void
turn_on_default_aging(struct spwd *spw)
{
    int minweeks;
    int maxweeks;
    int warnweeks;
    void    *defp;

    if ((defp = defopen_r(PWADMIN)) == NULL) {
        minweeks = MINWEEKS;
        maxweeks = MAXWEEKS;
        warnweeks = WARNWEEKS;
    } else {
        minweeks = def_getuint("MINWEEKS=", MINWEEKS, defp);
        maxweeks = def_getuint("MAXWEEKS=", MAXWEEKS, defp);
        warnweeks = def_getuint("WARNWEEKS=", WARNWEEKS, defp);
        defclose_r(defp);
    }

    /*
     * The values specified in /etc/default/passwd are interpreted
     * in a specific way. Special cases are
     *   MINWEEKS==0 (results in sp_min = -1)
     *   MAXWEEKS==0 (results in sp_max = default)
     */
    spw->sp_min = 7 * minweeks;
    if (spw->sp_min <= 0)
        spw->sp_min = -1;

    spw->sp_max = 7 * maxweeks;
    if (spw->sp_max == 0)
        spw->sp_max = 7 * MAXWEEKS;
    if (spw->sp_max < 0)
        spw->sp_max = -1;

    spw->sp_warn = 7 * warnweeks;
    if (spw->sp_warn <= 0)
        spw->sp_warn = -1;
}

/*
 * open and read a value from the defaults file,
 * return value found or default value if not found.
 */
int
def_getint(char *name, int defvalue)
{
    int val;
    void    *defp;

    if ((defp = defopen_r(PWADMIN)) == NULL) {
        val = defvalue;
    } else {
        val = def_getuint(name, defvalue, defp);
        defclose_r(defp);
    }

    return (val);
}