libsecdb/common/getuserattr.c

	getuserattr.c revision 7c478bd95313f5f23a4c958a745db2134aa03244
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (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 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

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

#include <sys/types.h>
#include <sys/mman.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <nss_dbdefs.h>
#include <user_attr.h>
#include <getxby_door.h>
#include <pwd.h>


/* Externs from libnsl */
extern userstr_t *_getusernam(const char *, userstr_t *, char *, int, int *);
extern userstr_t *_getuserattr(userstr_t *, char *, int, int *);
extern userstr_t *_fgetuserattr(FILE *, userstr_t *, char *, int);
extern void _setuserattr(void);
extern void _enduserattr(void);


static userattr_t *userstr2attr(userstr_t *);
static userstr_t *process_getuser(userstr_t *, char *, int, nsc_data_t *);


userattr_t *
getuserattr()
{
    int     err = 0;
    char        buf[NSS_BUFLEN_USERATTR];
    userstr_t   user;
    userstr_t   *tmp;

    (void) memset(&user, 0, sizeof (userattr_t));
    tmp = _getuserattr(&user, buf, NSS_BUFLEN_USERATTR, &err);
    return (userstr2attr(tmp));
}


userattr_t *
fgetuserattr(FILE *f)
{
    char        buf[NSS_BUFLEN_USERATTR];
    userstr_t   user;
    userstr_t   *tmp;

    (void) memset(&user, 0, sizeof (userattr_t));
    tmp = _fgetuserattr(f, &user, buf, NSS_BUFLEN_USERATTR);
    return (userstr2attr(tmp));
}


userattr_t *
getusernam(const char *name)
{
    int     err = 0;
    int     ndata;
    int     adata;
    char        buf[NSS_BUFLEN_USERATTR];
    userstr_t   user;
    union {
        nsc_data_t  s_d;
        char        s_b[1024];
    } space;
    nsc_data_t  *sptr;
    userstr_t   *resptr = (userstr_t *)NULL;

#ifdef  PIC
    if ((name == NULL) ||
        (strlen(name) >= (sizeof (space) - sizeof (nsc_data_t)))) {
        errno = ERANGE;
        return ((userattr_t *)NULL);
    }
    ndata = sizeof (space);
    adata = strlen(name) + sizeof (nsc_call_t) + 1;
    space.s_d.nsc_call.nsc_callnumber = GETUSERNAM;
    (void) strcpy(space.s_d.nsc_call.nsc_u.name, name);
    sptr = &space.s_d;

    switch (_nsc_trydoorcall(&sptr, &ndata, &adata)) {
    case SUCCESS:   /* positive cache hit */
        break;
    case NOTFOUND:  /* negative cache hit */
        return ((userattr_t *)NULL);
    default:
        (void) memset(&user, 0, sizeof (userattr_t));
        resptr = _getusernam(name, &user, buf,
            NSS_BUFLEN_USERATTR, &err);
        return (userstr2attr(resptr));
    }
    resptr = process_getuser(&user, buf, NSS_BUFLEN_USERATTR, sptr);

    /*
     * check if doors reallocated the memory underneath us
     * if they did munmap it or suffer a memory leak
     */
    if (sptr != &space.s_d)
        (void) munmap((void *)sptr, ndata);
#else   /* !PIC */
    resptr = _getusernam(name, &user, buf, NSS_BUFLEN_USERATTR, &err);
#endif  /* PIC */

    return (userstr2attr(resptr));

}


userattr_t *
getuseruid(uid_t u)
{
    struct  passwd pwd;
    char    buf[NSS_BUFLEN_PASSWD];

    if (getpwuid_r(u, &pwd, buf, NSS_BUFLEN_PASSWD) == NULL)
        return ((userattr_t *)NULL);
    return (getusernam(pwd.pw_name));
}


void
setuserattr()
{
    _setuserattr();
}


void
enduserattr()
{
    _enduserattr();
}


void
free_userattr(userattr_t *user)
{
    if (user) {
        free(user->name);
        free(user->qualifier);
        free(user->res1);
        free(user->res2);
        _kva_free(user->attr);
        free(user);
    }
}


static userattr_t *
userstr2attr(userstr_t *user)
{
    userattr_t *newuser;

    if (user == NULL)
        return ((userattr_t *)NULL);

    if ((newuser = (userattr_t *)malloc(sizeof (userattr_t))) == NULL)
        return ((userattr_t *)NULL);

    newuser->name = _do_unescape(user->name);
    newuser->qualifier = _do_unescape(user->qualifier);
    newuser->res1 = _do_unescape(user->res1);
    newuser->res2 = _do_unescape(user->res2);
    newuser->attr = _str2kva(user->attr, KV_ASSIGN, KV_DELIMITER);
    return (newuser);
}


static userstr_t *
process_getuser(
    userstr_t *result,
    char *buffer,
    int buflen,
    nsc_data_t *sptr)
{
    char *fixed;
#ifdef  _LP64
    userstr_t user64;

    fixed = (char *)(((uintptr_t)buffer + 7) & ~7);
#else
    fixed = (char *)(((uintptr_t)buffer + 3) & ~3);
#endif
    buflen -= fixed - buffer;
    buffer = fixed;

    if (sptr->nsc_ret.nsc_return_code != SUCCESS)
        return ((userstr_t *)NULL);

#ifdef  _LP64
    if (sptr->nsc_ret.nsc_bufferbytesused - (int)sizeof (userstr32_t)
        > buflen)
#else
    if (sptr->nsc_ret.nsc_bufferbytesused - (int)sizeof (userstr_t)
        > buflen)
#endif
    {
        errno = ERANGE;
        return ((userstr_t *)NULL);
    }

#ifdef  _LP64
    (void) memcpy(buffer, (sptr->nsc_ret.nsc_u.buff + sizeof (userstr32_t)),
        (sptr->nsc_ret.nsc_bufferbytesused - sizeof (userstr32_t)));
    user64.name = (char *)(sptr->nsc_ret.nsc_u.user.name +
        (uintptr_t)buffer);
    user64.qualifier = (char *)(sptr->nsc_ret.nsc_u.user.qualifier +
        (uintptr_t)buffer);
    user64.res1 = (char *)(sptr->nsc_ret.nsc_u.user.res1 +
        (uintptr_t)buffer);
    user64.res2 = (char *)(sptr->nsc_ret.nsc_u.user.res2 +
        (uintptr_t)buffer);
    user64.attr = (char *)(sptr->nsc_ret.nsc_u.user.attr +
        (uintptr_t)buffer);
    *result = user64;
#else
    sptr->nsc_ret.nsc_u.user.name += (uintptr_t)buffer;
    sptr->nsc_ret.nsc_u.user.qualifier += (uintptr_t)buffer;
    sptr->nsc_ret.nsc_u.user.res1 += (uintptr_t)buffer;
    sptr->nsc_ret.nsc_u.user.res2 += (uintptr_t)buffer;
    sptr->nsc_ret.nsc_u.user.attr += (uintptr_t)buffer;
    *result = sptr->nsc_ret.nsc_u.user;
    (void) memcpy(buffer, (sptr->nsc_ret.nsc_u.buff + sizeof (userstr_t)),
        (sptr->nsc_ret.nsc_bufferbytesused - sizeof (userstr_t)));
#endif
    return (result);
}


#ifdef DEBUG
void
print_userattr(userattr_t *user)
{
    extern void print_kva(kva_t *);
    char *empty = "empty";

    if (user == NULL) {
        printf("NULL\n");
        return;
    }

    printf("name=%s\n", user->name ? user->name : empty);
    printf("qualifier=%s\n", user->qualifier ? user->qualifier : empty);
    printf("res1=%s\n", user->res1 ? user->res1 : empty);
    printf("res2=%s\n", user->res2 ? user->res2 : empty);
    printf("attr=\n");
    print_kva(user->attr);
    fflush(stdout);
}
#endif  /* DEBUG */