lib/passwdutil/files_attr.c

	files_attr.c revision 004388ebfdfe2ed7dfd2d153a876dfcc22d2c006
/*
 * 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 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include <sys/types.h>
#include <fcntl.h>
#include <errno.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <pwd.h>
#include <shadow.h>
#include <string.h>
#include <strings.h>
#include <stdlib.h>
#include <unistd.h>
#include <nss_dbdefs.h>
#include <macros.h>
#include <syslog.h>

#include <limits.h>     /* LOGNAME_MAX -- max Solaris user name */

#include "passwdutil.h"

int files_lock(void);
int files_unlock(void);
int files_checkhistory(char *user, char *passwd, pwu_repository_t *rep);
int files_getattr(char *name, attrlist *item, pwu_repository_t *rep);
int files_getpwnam(char *name, attrlist *items, pwu_repository_t *rep,
    void **buf);
int files_update(attrlist *items, pwu_repository_t *rep, void *buf);
int files_putpwnam(char *name, char *oldpw, char *dummy,
    pwu_repository_t *rep, void *buf);
int files_user_to_authenticate(char *name, pwu_repository_t *rep,
    char **auth_user, int *privileged);

static int files_update_history(char *name, struct spwd *spwd);

/*
 * files function pointer table, used by passwdutil_init to initialize
 * the global Repository-OPerations table "rops"
 */
struct repops files_repops = {
    files_checkhistory,
    files_getattr,
    files_getpwnam,
    files_update,
    files_putpwnam,
    files_user_to_authenticate,
    files_lock,
    files_unlock
};

/*
 * this structure defines the buffer used to keep state between
 * get/update/put calls
 */
struct pwbuf {
    int update_history;
    struct passwd *pwd;
    char   *pwd_scratch;
    struct spwd *spwd;
    char   *spwd_scratch;
    char   *new_sp_pwdp;
};

/*
 * We should use sysconf, but there is no sysconf name for SHADOW
 * so we use these from nss_dbdefs
 */
#define PWD_SCRATCH_SIZE NSS_LINELEN_PASSWD
#define SPW_SCRATCH_SIZE NSS_LINELEN_SHADOW

/*
 * lock functions for files repository
 */
int
files_lock(void)
{
    int res;

    if (lckpwdf()) {
        switch (errno) {
        case EINTR:
            res = PWU_BUSY;
            break;
        case EACCES:
            res = PWU_DENIED;
            break;
        case 0:
            res = PWU_SUCCESS;
            break;
        }
    } else
        res = PWU_SUCCESS;

    return (res);
}

int
files_unlock(void)
{
    if (ulckpwdf())
        return (PWU_SYSTEM_ERROR);

    return (PWU_SUCCESS);
}

/*
 * files_privileged
 *
 * Are we a privileged user with regard to the files repository?
 */
int
files_privileged(void)
{
    return (getuid() == 0);
}

/*
 *
 * private_getpwnam_r()
 *
 * A private implementation of getpwnam_r which does *not* fall back to
 * other services possibly defined in nsswitch.conf
 *
 * behaves like getpwnam_r().
 */
struct passwd *
private_getpwnam_r(const char *name, struct passwd *result, char *buffer,
    int buflen)
{
    FILE *fp;
    int found;

    if ((fp = fopen(PASSWD, "rF")) == NULL)
        return (NULL);

    found = 0;
    while (!found && fgetpwent_r(fp, result, buffer, buflen) != NULL) {
        if (strcmp(name, result->pw_name) == 0)
            found = 1;
    }

    (void) fclose(fp);

    if (!found) {
        (void) memset(buffer, 0, buflen);
        (void) memset(result, 0, sizeof (*result));
        return (NULL);
    }

    return (result);
}

/*
 * private_getspnam_r()
 *
 * A private implementation of getspnam_r which does *not* fall back to
 * other services possibly defined in nsswitch.conf.
 *
 * Behaves like getspnam_r(). Since we use fgetspent_t(), all numeric
 * fields that are undefined in /etc/shadow will be set to -1.
 *
 */
struct spwd *
private_getspnam_r(const char *name, struct spwd *result, char *buffer,
    int buflen)
{
    FILE *fp;
    int found;

    fp = fopen(SHADOW, "rF");
    if (fp == NULL)
        return (NULL);

    found = 0;
    while (!found && fgetspent_r(fp, result, buffer, buflen) != NULL) {
        if (strcmp(name, result->sp_namp) == 0)
            found = 1;
    }

    (void) fclose(fp);

    if (!found) {
        (void) memset(buffer, 0, buflen);
        (void) memset(result, 0, sizeof (*result));
        return (NULL);
    }
    return (result);
}

/*
 * files_getpwnam(name, items, rep, buf)
 *
 */
/*ARGSUSED*/
int
files_getpwnam(char *name, attrlist *items, pwu_repository_t *rep, void **buf)
{
    attrlist *p;
    struct pwbuf *pwbuf;
    int err = PWU_SUCCESS;

    *buf = calloc(1, sizeof (struct pwbuf));
    pwbuf = (struct pwbuf *)*buf;

    /*
     * determine which password structure (/etc/passwd or /etc/shadow)
     * we need for the items we need to update
     */
    for (p = items; p != NULL; p = p->next) {
        switch (p->type) {
        case ATTR_NAME:
        case ATTR_UID:
        case ATTR_GID:
        case ATTR_AGE:
        case ATTR_COMMENT:
        case ATTR_GECOS:
        case ATTR_HOMEDIR:
        case ATTR_SHELL:
            if (pwbuf->pwd == NULL) {
                pwbuf->pwd = malloc(sizeof (struct passwd));
                if (pwbuf->pwd == NULL) {
                    err = PWU_NOMEM;
                    goto error;
                }
            }
            break;
        case ATTR_PASSWD:
        case ATTR_PASSWD_SERVER_POLICY:
        case ATTR_LSTCHG:
        case ATTR_MIN:
        case ATTR_MAX:
        case ATTR_WARN:
        case ATTR_INACT:
        case ATTR_EXPIRE:
        case ATTR_FLAG:
        case ATTR_LOCK_ACCOUNT:
        case ATTR_EXPIRE_PASSWORD:
        case ATTR_FAILED_LOGINS:
        case ATTR_INCR_FAILED_LOGINS:
        case ATTR_RST_FAILED_LOGINS:
        case ATTR_NOLOGIN_ACCOUNT:
        case ATTR_UNLOCK_ACCOUNT:
            if (pwbuf->spwd == NULL) {
                pwbuf->spwd = malloc(sizeof (struct spwd));
                if (pwbuf->spwd == NULL) {
                    err = PWU_NOMEM;
                    goto error;
                }
            }
            break;
        default:
            /*
             * Some other repository might have different values
             * so we ignore those.
             */
            break;
        }
    }

    if (pwbuf->pwd) {
        if ((pwbuf->pwd_scratch = malloc(PWD_SCRATCH_SIZE)) == NULL) {
            err = PWU_NOMEM;
            goto error;
        }
        if (private_getpwnam_r(name, pwbuf->pwd, pwbuf->pwd_scratch,
            PWD_SCRATCH_SIZE) == NULL) {
            err = PWU_NOT_FOUND;
            goto error;
        }
    }

    if (pwbuf->spwd) {
        if ((pwbuf->spwd_scratch = malloc(SPW_SCRATCH_SIZE)) == NULL) {
            err = PWU_NOMEM;
            goto error;
        }
        if (private_getspnam_r(name, pwbuf->spwd, pwbuf->spwd_scratch,
            SPW_SCRATCH_SIZE) == NULL) {
            err = PWU_NOT_FOUND;
            goto error;
        }
    }

    return (PWU_SUCCESS);
error:
    if (pwbuf->pwd) free(pwbuf->pwd);
    if (pwbuf->pwd_scratch) free(pwbuf->pwd_scratch);
    if (pwbuf->spwd) free(pwbuf->spwd);
    if (pwbuf->spwd_scratch) free(pwbuf->spwd_scratch);
    free(pwbuf);
    *buf = NULL;

    return (err);
}

/*
 * int files_user_to_authenticate(name, rep, auth_user, privileged)
 * Determine which user needs to be authenticated. For files, the
 * possible return values are:
 *  PWU_NOT_FOUND
 *  PWU_SUCCESS and (auth_user == NULL || auth_user = user)
 *  PWU_DENIED
 */
/*ARGSUSED*/
int
files_user_to_authenticate(char *user, pwu_repository_t *rep,
    char **auth_user, int *privileged)
{
    struct pwbuf *pwbuf;
    int res;
    attrlist attr_tmp[1] = { { ATTR_UID, NULL, NULL } };

    /* check to see if target user is present in files */
    res = files_getpwnam(user, &attr_tmp[0], rep, (void **)&pwbuf);
    if (res != PWU_SUCCESS)
        return (res);

    if (files_privileged()) {
        *auth_user = NULL;
        *privileged = 1;
        res = PWU_SUCCESS;
    } else {
        *privileged = 0;
        if (getuid() == pwbuf->pwd->pw_uid) {
            *auth_user = strdup(user);
            res = PWU_SUCCESS;
        } else {
            res = PWU_DENIED;
        }
    }

    if (pwbuf->pwd) free(pwbuf->pwd);
    if (pwbuf->pwd_scratch) free(pwbuf->pwd_scratch);
    if (pwbuf->spwd) free(pwbuf->spwd);
    if (pwbuf->spwd_scratch) free(pwbuf->spwd_scratch);
    free(pwbuf);

    return (res);
}

/*
 *  Password history file format:
 *      user:crypw1: ... crypwn: such that n <= MAXHISTORY
 */
#define HISTORY     "/etc/security/passhistory"
#define HISTEMP     "/etc/security/pwhistemp"
#define OHISTORY    "/etc/security/opwhistory"
#define HISTMODE    S_IRUSR /* mode to create history file */
/*
 * XXX
 *  3*LOGNAME_MAX just in case there are long user names.
 *  Traditionally Solaris LOGNAME_MAX (_POSIX_LOGIN_NAME_MAX) is 13,
 *  but some sites often user more.
 *  If LOGNAME_MAX ever becomes reasonable (128) and actually enforced,
 *  fix up here.
 * XXX
 */
#define MAX_LOGNAME (3 * LOGNAME_MAX)

/*
 *  files_checkhistory - check if a user's new password is in the user's
 *      old password history.
 *
 *  Entry
 *      user = username.
 *      passwd = new clear text password.
 *
 *  Exit
 *      PWU_SUCCESS, passwd found in user's old password history.
 *          The caller should only be interested and fail if
 *          PWU_SUCCESS is returned.
 *      PWU_NOT_FOUND, passwd not in user's old password history.
 *      PWU_errors, PWU_ errors from other routines.
 *
 */
int
files_checkhistory(char *user, char *passwd, pwu_repository_t *rep)
{
    attrlist attr;
    int res;

    attr.type = ATTR_HISTORY;
    attr.data.val_s = NULL;
    attr.next = NULL;

    debug("files_checkhistory(user=%s)", user);

    /*
     * XXX
     *  This depends on the underlying files_getattr implementation
     *  treating user not found in backing store or no history as
     *  an error.
     * XXX
     */

    if ((res = files_getattr(user, &attr, rep)) == PWU_SUCCESS) {
        char    *s;
        char    *crypt_passwd;
        int histsize;
        char    *last = attr.data.val_s;

        if ((histsize = def_getint("HISTORY=", DEFHISTORY)) == 0) {
            debug("files_checkhistory: no history requested");
            res = PWU_NOT_FOUND;
            goto out;
        }

        debug("files_checkhistory: histsize = %d", histsize);
        if (histsize > MAXHISTORY)
            histsize = MAXHISTORY;

        debug("line to test\n\t%s", last);

        /* compare crypt_passwd to attr.data.val_s strings. */
        res = PWU_NOT_FOUND;
        while ((histsize-- > 0) &&
            (((s = strtok_r(NULL, ":", &last)) != NULL) &&
            (*s != '\n'))) {

            crypt_passwd = crypt(passwd, s);
            debug("files_checkhistory: user_pw=%s, history_pw=%s",
                crypt_passwd, s);
            if (strcmp(crypt_passwd, s) == 0) {
                res = PWU_SUCCESS;
                break;
            }
        }
        debug("files_checkhistory(%s, %s) = %d", user, crypt_passwd,
            res);
    }
out:
    if (attr.data.val_s != NULL)
        free(attr.data.val_s);

    return (res);
}

/*
 * files_getattr(name, items, rep)
 *
 * Get attributes specified in list 'items'
 */
int
files_getattr(char *name, attrlist *items, pwu_repository_t *rep)
{
    struct pwbuf *pwbuf;
    struct passwd *pw;
    struct spwd *spw;
    attrlist *w;
    int res;

    res = files_getpwnam(name, items, rep, (void **)&pwbuf);
    if (res != PWU_SUCCESS)
        return (res);

    pw = pwbuf->pwd;
    spw = pwbuf->spwd;

    for (w = items; res == PWU_SUCCESS && w != NULL; w = w->next) {
        switch (w->type) {
        case ATTR_NAME:
            if ((w->data.val_s = strdup(pw->pw_name)) == NULL)
                res = PWU_NOMEM;
            break;
        case ATTR_COMMENT:
            if ((w->data.val_s = strdup(pw->pw_comment)) == NULL)
                res = PWU_NOMEM;
            break;
        case ATTR_GECOS:
            if ((w->data.val_s = strdup(pw->pw_gecos)) == NULL)
                res = PWU_NOMEM;
            break;
        case ATTR_HOMEDIR:
            if ((w->data.val_s = strdup(pw->pw_dir)) == NULL)
                res = PWU_NOMEM;
            break;
        case ATTR_SHELL:
            if ((w->data.val_s = strdup(pw->pw_shell)) == NULL)
                res = PWU_NOMEM;
            break;
        /*
         * Nothing special needs to be done for
         * server policy
         */
        case ATTR_PASSWD:
        case ATTR_PASSWD_SERVER_POLICY:
            if ((w->data.val_s = strdup(spw->sp_pwdp)) == NULL)
                res = PWU_NOMEM;
            break;
        case ATTR_AGE:
            if ((w->data.val_s = strdup(pw->pw_age)) == NULL)
                res = PWU_NOMEM;
            break;
        case ATTR_REP_NAME:
            if ((w->data.val_s = strdup("files")) == NULL)
                res = PWU_NOMEM;
            break;
        case ATTR_HISTORY: {
            FILE    *history;
            char    buf[MAX_LOGNAME + MAXHISTORY +
                (MAXHISTORY * CRYPT_MAXCIPHERTEXTLEN)+1];
            char    *s, *s1;

            debug("files_getattr: Get password history for %s ",
                name);

            if ((history = fopen(HISTORY, "rF")) == NULL) {
                debug("files_getattr: %s not found", HISTORY);
                res = PWU_OPEN_FAILED;
                goto getattr_exit;
            }
            res = PWU_NOT_FOUND;
            while ((s = fgets(buf, sizeof (buf), history)) !=
                NULL) {
                s1 = strchr(s, ':');
                if (s1 != NULL) {
                    *s1 = '\0';
                } else {
                    res = PWU_NOT_FOUND;
                    break;
                }
#ifdef  DEBUG
                debug("got history line for %s", s);
#endif  /* DEBUG */
                if (strcmp(s, name) == 0) {
                    /* found user */
                    if ((items->data.val_s =
                        strdup(s1+1)) == NULL)
                        res = PWU_NOMEM;
                    else
                        res = PWU_SUCCESS;
                    break;
                }
            }
            (void) fclose(history);
            break;
        }

        /* integer values */
        case ATTR_UID:
            w->data.val_i = pw->pw_uid;
            break;
        case ATTR_GID:
            w->data.val_i = pw->pw_gid;
            break;
        case ATTR_LSTCHG:
            w->data.val_i = spw->sp_lstchg;
            break;
        case ATTR_MIN:
            w->data.val_i = spw->sp_min;
            break;
        case ATTR_MAX:
            w->data.val_i = spw->sp_max;
            break;
        case ATTR_WARN:
            w->data.val_i = spw->sp_warn;
            break;
        case ATTR_INACT:
            w->data.val_i = spw->sp_inact;
            break;
        case ATTR_EXPIRE:
            w->data.val_i = spw->sp_expire;
            break;
        case ATTR_FLAG:
            w->data.val_i = spw->sp_flag;
            break;
        case ATTR_FAILED_LOGINS:
            w->data.val_i = spw->sp_flag & FAILCOUNT_MASK;
            break;
        default:
            break;
        }
    }

getattr_exit:
    if (pwbuf->pwd) free(pwbuf->pwd);
    if (pwbuf->pwd_scratch) free(pwbuf->pwd_scratch);
    if (pwbuf->spwd) free(pwbuf->spwd);
    free(pwbuf);

    return (res);
}

/*
 * max_present(list)
 *
 * see if attribute ATTR_MAX, with value != -1, is present in
 * attribute-list "list".
 *
 * returns 1 if present, 0 otherwise.
 */
static int
max_present(attrlist *list)
{
    while (list != NULL)
        if (list->type == ATTR_MAX && list->data.val_i != -1)
            return (1);
        else
            list = list->next;

    return (0);
}

/*
 * files_update(items, rep, buf)
 *
 * update the information in buf with the attributes specified in
 * items.
 */
/*ARGSUSED*/
int
files_update(attrlist *items, pwu_repository_t *rep, void *buf)
{
    struct pwbuf *pwbuf = (struct pwbuf *)buf;
    struct passwd *pw;
    struct spwd *spw;
    attrlist *p;
    int aging_needed = 0;
    int aging_set = 0;
    int disable_aging;
    char *pword;
    int len;

    pw = pwbuf->pwd;
    spw = pwbuf->spwd;
    pwbuf->update_history = 0;

    /*
     * if sp_max==0 : disable passwd aging after updating the password
     */
    disable_aging = (spw != NULL && spw->sp_max == 0);

    for (p = items; p != NULL; p = p->next) {
        switch (p->type) {
        case ATTR_NAME:
            break;  /* We are able to handle this, but... */
        case ATTR_UID:
            pw->pw_uid = (uid_t)p->data.val_i;
            break;
        case ATTR_GID:
            pw->pw_gid = (gid_t)p->data.val_i;
            break;
        case ATTR_AGE:
            pw->pw_age = p->data.val_s;
            break;
        case ATTR_COMMENT:
            pw->pw_comment = p->data.val_s;
            break;
        case ATTR_GECOS:
            pw->pw_gecos = p->data.val_s;
            break;
        case ATTR_HOMEDIR:
            pw->pw_dir = p->data.val_s;
            break;
        case ATTR_SHELL:
            pw->pw_shell = p->data.val_s;
            break;

        /*
         * Nothing special needs to be done for
         * server policy
         */
        case ATTR_PASSWD:
        case ATTR_PASSWD_SERVER_POLICY:
            /*
             * There is a special case only for files: if the
             * password is to be deleted (-d to passwd),
             * p->data.val_s will be NULL.
             */
            if (p->data.val_s == NULL) {
                spw->sp_pwdp = "";
            } else {
                char *salt = NULL;
                char *hash = NULL;

                salt = crypt_gensalt(spw->sp_pwdp, pw);

                if (salt == NULL) {
                    if (errno == ENOMEM)
                        return (PWU_NOMEM);
                    /* algorithm problem? */
                    syslog(LOG_AUTH | LOG_ALERT,
                        "passwdutil: crypt_gensalt %m");
                    return (PWU_UPDATE_FAILED);
                }
                hash = crypt(p->data.val_s, salt);
                free(salt);
                if (hash == NULL) {
                    errno = ENOMEM;
                    return (PWU_NOMEM);
                }
                pword = strdup(hash);
                free(hash);
                if (pword == NULL) {
                    errno = ENOMEM;
                    return (PWU_NOMEM);
                }

                if (pwbuf->new_sp_pwdp)
                    free(pwbuf->new_sp_pwdp);
                pwbuf->new_sp_pwdp = pword;
                spw->sp_pwdp = pword;
                aging_needed = 1;
                pwbuf->update_history = 1;
            }
            spw->sp_flag &= ~FAILCOUNT_MASK; /* reset count */
            spw->sp_lstchg = DAY_NOW_32;
            break;
        case ATTR_LOCK_ACCOUNT:
            if (spw->sp_pwdp == NULL) {
                spw->sp_pwdp = LOCKSTRING;
            } else if (strncmp(spw->sp_pwdp, LOCKSTRING,
                sizeof (LOCKSTRING)-1) != 0) {
                len = sizeof (LOCKSTRING)-1 +
                    strlen(spw->sp_pwdp) + 1;
                pword = malloc(len);
                if (pword == NULL) {
                    errno = ENOMEM;
                    return (PWU_NOMEM);
                }
                (void) strlcpy(pword, LOCKSTRING, len);
                (void) strlcat(pword, spw->sp_pwdp, len);
                if (pwbuf->new_sp_pwdp)
                    free(pwbuf->new_sp_pwdp);
                pwbuf->new_sp_pwdp = pword;
                spw->sp_pwdp = pword;
            }
            spw->sp_lstchg = DAY_NOW_32;
            break;
        case ATTR_UNLOCK_ACCOUNT:
            if (spw->sp_pwdp != NULL &&
                strncmp(spw->sp_pwdp, LOCKSTRING,
                sizeof (LOCKSTRING)-1) == 0) {
                (void) strcpy(spw->sp_pwdp, spw->sp_pwdp +
                    sizeof (LOCKSTRING)-1);
            }
            spw->sp_lstchg = DAY_NOW_32;
            break;
        case ATTR_NOLOGIN_ACCOUNT:
            spw->sp_pwdp = NOLOGINSTRING;
            if (pwbuf->new_sp_pwdp) {
                free(pwbuf->new_sp_pwdp);
                pwbuf->new_sp_pwdp = NULL;
            }
            spw->sp_lstchg = DAY_NOW_32;
            break;
        case ATTR_EXPIRE_PASSWORD:
            spw->sp_lstchg = 0;
            break;
        case ATTR_LSTCHG:
            spw->sp_lstchg = p->data.val_i;
            break;
        case ATTR_MIN:
            if (spw->sp_max == -1 &&
                p->data.val_i != -1 && max_present(p->next) == 0)
                return (PWU_AGING_DISABLED);
            spw->sp_min = p->data.val_i;
            aging_set = 1;
            break;
        case ATTR_MAX:
            if (p->data.val_i == -1) {
                /* Turn aging off -> Reset min and warn too */

                spw->sp_min = -1;
                spw->sp_warn = -1;
            } else {
                /* Turn aging on */

                if (spw->sp_min == -1) {
                    /*
                     * If minage has not been set with
                     * a command-line option, we set it
                     * to zero.
                     */
                    spw->sp_min = 0;
                }

                /*
                 * If aging was turned off, we update lstchg.
                 *
                 * We take care not to update lstchg if the
                 * user has no password, otherwise the user
                 * might not be required to provide a password
                 * the next time [s]he logs-in.
                 *
                 * Also, if lstchg != -1 (i.e., not set in
                 * /etc/shadow), we keep the old value.
                 */
                if (spw->sp_max == -1 &&
                    spw->sp_pwdp != NULL && *spw->sp_pwdp &&
                    spw->sp_lstchg == -1) {
                    spw->sp_lstchg = DAY_NOW_32;
                }
            }

            spw->sp_max = p->data.val_i;

            aging_set = 1;

            break;
        case ATTR_WARN:
            if (spw->sp_max == -1 && p->data.val_i != -1 &&
                max_present(p->next) == 0)
                return (PWU_AGING_DISABLED);
            spw->sp_warn =  p->data.val_i;
            break;
        case ATTR_INACT:
            spw->sp_inact = p->data.val_i;
            break;
        case ATTR_EXPIRE:
            spw->sp_expire = p->data.val_i;
            break;
        case ATTR_FLAG:
            spw->sp_flag = p->data.val_i;
            break;
        case ATTR_INCR_FAILED_LOGINS:
            {
            int count = (spw->sp_flag & FAILCOUNT_MASK) + 1;
            spw->sp_flag &= ~FAILCOUNT_MASK;
            spw->sp_flag |= min(FAILCOUNT_MASK, count);
            p->data.val_i = count;
            }
            break;
        case ATTR_RST_FAILED_LOGINS:
            p->data.val_i = spw->sp_flag & FAILCOUNT_MASK;
            spw->sp_flag &= ~FAILCOUNT_MASK;
            break;
        default:
            break;
        }
    }

    /*
     * What should the new aging values look like?
     *
     * There are a number of different conditions
     *
     *  a) aging is already configured: don't touch it
     *
     *  b) disable_aging is set: disable aging
     *
     *  c) aging is not configured: turn on default aging;
     *
     *  b) and c) of course only if aging_needed and !aging_set.
     *  (i.e., password changed, and aging values not changed)
     */

    if (spw != NULL && spw->sp_max <= 0) {
        /* a) aging not yet configured */
        if (aging_needed && !aging_set) {
            if (disable_aging) {
                /* b) turn off aging */
                spw->sp_min = spw->sp_max = spw->sp_warn = -1;
            } else {
                /* c) */
                turn_on_default_aging(spw);
            }
        }
    }

    return (PWU_SUCCESS);
}

/*
 * files_update_shadow(char *name, struct spwd *spwd)
 *
 * update the shadow password file SHADOW to contain the spwd structure
 * "spwd" for user "name"
 */
int
files_update_shadow(char *name, struct spwd *spwd)
{
    struct stat64 stbuf;
    FILE *dst;
    FILE *src;
    struct spwd cur;
    char buf[SPW_SCRATCH_SIZE];
    int tempfd;
    mode_t filemode;
    int result = -1;
    int err = PWU_SUCCESS;

    /* Mode of the shadow file should be 400 or 000 */
    if (stat64(SHADOW, &stbuf) < 0) {
        err = PWU_STAT_FAILED;
        goto shadow_exit;
    }

    /* copy mode from current shadow file (0400 or 0000) */
    filemode = stbuf.st_mode & S_IRUSR;

    /*
     * we can't specify filemodes to fopen(), and we SHOULD NOT
     * set umask in multi-thread safe libraries, so we use
     * a combination of open() and fdopen()
     */
    tempfd = open(SHADTEMP, O_WRONLY|O_CREAT|O_TRUNC, filemode);
    if (tempfd < 0) {
        err = PWU_OPEN_FAILED;
        goto shadow_exit;
    }
    (void) fchown(tempfd, (uid_t)0, stbuf.st_gid);

    if ((dst = fdopen(tempfd, "wF")) == NULL) {
        err = PWU_OPEN_FAILED;
        goto shadow_exit;
    }

    if ((src = fopen(SHADOW, "rF")) == NULL) {
        err = PWU_OPEN_FAILED;
        (void) fclose(dst);
        (void) unlink(SHADTEMP);
        goto shadow_exit;
    }

    /*
     * copy old shadow to temporary file while replacing the entry
     * that matches "name".
     */
    while (fgetspent_r(src, &cur, buf, sizeof (buf)) != NULL) {

        if (strcmp(cur.sp_namp, name) == 0)
            result = putspent(spwd, dst);
        else
            result = putspent(&cur, dst);

        if (result != 0) {
            err = PWU_WRITE_FAILED;
            (void) fclose(src);
            (void) fclose(dst);
            goto shadow_exit;
        }
    }

    (void) fclose(src);

    if (fclose(dst) != 0) {
        /*
         * Something went wrong (ENOSPC for example). Don't
         * use the resulting temporary file!
         */
        err = PWU_CLOSE_FAILED;
        (void) unlink(SHADTEMP);
        goto shadow_exit;
    }

    /*
     * Rename stmp to shadow:
     *   1. make sure /etc/oshadow is gone
     *   2. ln /etc/shadow /etc/oshadow
     *   3. mv /etc/stmp /etc/shadow
     */
    if (unlink(OSHADOW) && access(OSHADOW, 0) == 0) {
        err = PWU_UPDATE_FAILED;
        (void) unlink(SHADTEMP);
        goto shadow_exit;
    }

    if (link(SHADOW, OSHADOW) == -1) {
        err = PWU_UPDATE_FAILED;
        (void) unlink(SHADTEMP);
        goto shadow_exit;
    }

    if (rename(SHADTEMP, SHADOW) == -1) {
        err = PWU_UPDATE_FAILED;
        (void) unlink(SHADTEMP);
        goto shadow_exit;
    }
    (void) unlink(OSHADOW);

shadow_exit:
    return (err);
}

int
files_update_passwd(char *name, struct passwd *pwd)
{
    struct stat64 stbuf;
    FILE *src, *dst;
    int tempfd;
    struct passwd cur;
    char buf[PWD_SCRATCH_SIZE];
    int result;
    int err = PWU_SUCCESS;

    if (stat64(PASSWD, &stbuf) < 0) {
        err = PWU_STAT_FAILED;
        goto passwd_exit;
    }

    /* see files_update_shadow() for open()+fdopen() rationale */

    if ((tempfd = open(PASSTEMP, O_WRONLY|O_CREAT|O_TRUNC, 0600)) < 0) {
        err = PWU_OPEN_FAILED;
        goto passwd_exit;
    }
    if ((dst = fdopen(tempfd, "wF")) == NULL) {
        err = PWU_OPEN_FAILED;
        goto passwd_exit;
    }
    if ((src = fopen(PASSWD, "rF")) == NULL) {
        err = PWU_OPEN_FAILED;
        (void) fclose(dst);
        (void) unlink(PASSTEMP);
        goto passwd_exit;
    }

    /*
     * copy old password entries to temporary file while replacing
     * the entry that matches "name"
     */
    while (fgetpwent_r(src, &cur, buf, sizeof (buf)) != NULL) {
        if (strcmp(cur.pw_name, name) == 0)
            result = putpwent(pwd, dst);
        else
            result = putpwent(&cur, dst);
        if (result != 0) {
            err = PWU_WRITE_FAILED;
            (void) fclose(src);
            (void) fclose(dst);
            goto passwd_exit;
        }
    }

    (void) fclose(src);
    if (fclose(dst) != 0) {
        err = PWU_CLOSE_FAILED;
        goto passwd_exit; /* Don't trust the temporary file */
    }

    /* Rename temp to passwd */
    if (unlink(OPASSWD) && access(OPASSWD, 0) == 0) {
        err = PWU_UPDATE_FAILED;
        (void) unlink(PASSTEMP);
        goto passwd_exit;
    }

    if (link(PASSWD, OPASSWD) == -1) {
        err = PWU_UPDATE_FAILED;
        (void) unlink(PASSTEMP);
        goto passwd_exit;
    }

    if (rename(PASSTEMP, PASSWD) == -1) {
        err = PWU_UPDATE_FAILED;
        (void) unlink(PASSTEMP);
        goto passwd_exit;
    }

    (void) chmod(PASSWD, 0644);

passwd_exit:
    return (err);

}

/*
 * files_putpwnam(name, oldpw, dummy, rep, buf)
 *
 * store the password attributes contained in "buf" in /etc/passwd and
 * /etc/shadow. The dummy parameter is a placeholder for NIS+
 * updates where the "oldrpc" password is passed.
 */
/*ARGSUSED*/
int
files_putpwnam(char *name, char *oldpw, char *dummy,
    pwu_repository_t *rep, void *buf)
{
    struct pwbuf *pwbuf = (struct pwbuf *)buf;
    int result = PWU_SUCCESS;

    if (pwbuf->pwd) {
        result = files_update_passwd(name, pwbuf->pwd);
    }

    if (result == PWU_SUCCESS && pwbuf->spwd) {
        if (pwbuf->update_history != 0) {
            debug("update_history = %d", pwbuf->update_history);
            result = files_update_history(name, pwbuf->spwd);
        } else {
            debug("no password change");
        }
        if (result == PWU_SUCCESS) {
            result = files_update_shadow(name, pwbuf->spwd);
        }
    }

    if (pwbuf->pwd) {
        (void) memset(pwbuf->pwd, 0, sizeof (struct passwd));
        (void) memset(pwbuf->pwd_scratch, 0, PWD_SCRATCH_SIZE);
        free(pwbuf->pwd);
        free(pwbuf->pwd_scratch);
    }
    if (pwbuf->spwd) {
        (void) memset(pwbuf->spwd, 0, sizeof (struct spwd));
        (void) memset(pwbuf->spwd_scratch, 0, SPW_SCRATCH_SIZE);
        free(pwbuf->spwd);
        free(pwbuf->spwd_scratch);
    }
    if (pwbuf->new_sp_pwdp) {
        free(pwbuf->new_sp_pwdp);
    }

    return (result);
}

/*
 *  NOTE:  This is all covered under the repository lock held for updating
 *  passwd(4) and shadow(4).
 */
int
files_update_history(char *name, struct spwd *spwd)
{
    int histsize;
    int tmpfd;
    FILE    *src;   /* history database file */
    FILE    *dst;   /* temp history database being updated */
    struct  stat64 statbuf;
    char buf[MAX_LOGNAME + MAXHISTORY +
        (MAXHISTORY * CRYPT_MAXCIPHERTEXTLEN)+1];
    int found;

    if ((histsize = def_getint("HISTORY=", DEFHISTORY)) == 0) {
        debug("files_update_history(%s) no history, unlinking", name);
        (void) unlink(HISTORY);
        return (PWU_SUCCESS);   /* no history update defined */
    }
    debug("files_update_history(%s, %s) histsize = %d", name, spwd->sp_pwdp,
        histsize);

    if (histsize > MAXHISTORY)
        histsize = MAXHISTORY;
    if ((tmpfd = open(HISTEMP, O_WRONLY|O_CREAT|O_TRUNC, HISTMODE)) < 0) {
        return (PWU_OPEN_FAILED);
    }
    (void) fchown(tmpfd, (uid_t)0, (gid_t)0);

    /* get ready to copy */
    if (((src = fopen(HISTORY, "rF")) == NULL) &&
        (errno != ENOENT)) {
        (void) unlink(HISTEMP);
        return (PWU_OPEN_FAILED);
    }
    if ((dst = fdopen(tmpfd, "wF")) == NULL) {
        (void) fclose(src);
        (void) unlink(HISTEMP);
        return (PWU_OPEN_FAILED);
    }

    /* Copy and update if found.  Add if not found. */

    found = 0;

    while ((src != NULL) &&
        (fgets(buf, sizeof (buf), src) != NULL)) {
        char    *user;
        char    *last;

        /* get username field */
        user = strtok_r(buf, ":", &last);

#ifdef  DEBUG
        debug("files_update_history: read=\"%s\"", user);
#endif  /* DEBUG */

        if (strcmp(user, name) == 0) {
            char    *crypt;
            int i;

            /* found user, update */
            found++;
            (void) fprintf(dst, "%s:%s:", name, spwd->sp_pwdp);
            debug("files_update_history: update user\n"
                "\t%s:%s:", name, spwd->sp_pwdp);

            /* get old crypted password history */
            for (i = 0; i < MAXHISTORY-1; i++) {
                crypt = strtok_r(NULL, ":", &last);
                if (crypt == NULL ||
                    *crypt == '\n') {
                    break;
                }
                (void) fprintf(dst, "%s:", crypt);
                debug("\t%d = %s:", i+1, crypt);
            }
            (void) fprintf(dst, "\n");
        } else {

            /* copy other users to updated file */
            (void) fprintf(dst, "%s:%s", user, last);
#ifdef  DEBUG
            debug("files_update_history: copy line %s",
                user);
#endif  /* DEBUG */
        }
    }

    if (found == 0) {

        /* user not found, add to history file */
        (void) fprintf(dst, "%s:%s:\n", name, spwd->sp_pwdp);
        debug("files_update_history: add line\n"
            "\t%s:%s:", name, spwd->sp_pwdp);
    }

    (void) fclose(src);

    /* If something messed up in file system, loose the update */
    if (fclose(dst) != 0) {

        debug("files_update_history: update file close failed %d",
            errno);
        (void) unlink(HISTEMP);
        return (PWU_CLOSE_FAILED);
    }

    /*
     * rename history to ohistory,
     * rename tmp to history,
     * unlink ohistory.
     */

    (void) unlink(OHISTORY);

    if (stat64(OHISTORY, &statbuf) == 0 ||
        ((src != NULL) && (link(HISTORY, OHISTORY) != 0)) ||
        rename(HISTEMP, HISTORY) != 0) {

        /* old history won't go away, loose the update */
        debug("files_update_history: update file rename failed %d",
            errno);
        (void) unlink(HISTEMP);
        return (PWU_UPDATE_FAILED);
    }

    (void) unlink(OHISTORY);
    return (PWU_SUCCESS);
}