ldap/common/getpwnam.c

	getpwnam.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 2003 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

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

#include <pwd.h>
#include "ldap_common.h"

/* passwd attributes filters */
#define _PWD_CN         "cn"
#define _PWD_UID        "uid"
#define _PWD_USERPASSWORD   "userpassword"
#define _PWD_UIDNUMBER      "uidnumber"
#define _PWD_GIDNUMBER      "gidnumber"
#define _PWD_GECOS      "gecos"
#define _PWD_DESCRIPTION    "description"
#define _PWD_HOMEDIRECTORY  "homedirectory"
#define _PWD_LOGINSHELL     "loginshell"


#define _F_GETPWNAM     "(&(objectClass=posixAccount)(uid=%s))"
#define _F_GETPWNAM_SSD     "(&(%%s)(uid=%s))"
#define _F_GETPWUID     "(&(objectClass=posixAccount)(uidNumber=%ld))"
#define _F_GETPWUID_SSD     "(&(%%s)(uidNumber=%ld))"

static const char *pwd_attrs[] = {
    _PWD_CN,
    _PWD_UID,
    _PWD_UIDNUMBER,
    _PWD_GIDNUMBER,
    _PWD_GECOS,
    _PWD_DESCRIPTION,
    _PWD_HOMEDIRECTORY,
    _PWD_LOGINSHELL,
    (char *)NULL
};


/*
 * _nss_ldap_passwd2ent is the data marshaling method for the passwd getXbyY
 * (e.g., getbyuid(), getbyname(), getpwent()) backend processes. This method is
 * called after a successful ldap search has been performed. This method will
 * parse the ldap search values into struct passwd = argp->buf.buffer which
 * the frontend process expects. Three error conditions are expected and
 * returned to nsswitch.
 */

static int
_nss_ldap_passwd2ent(ldap_backend_ptr be, nss_XbyY_args_t *argp)
{
    int     i = 0;
    int     nss_result;
    int     buflen = (int)0;
    unsigned long   len = 0L;
    char        *buffer = (char *)NULL;
    char        *ptr2x;
    char        *ceiling = (char *)NULL;
    char        *nullstring = (char *)NULL;
    struct passwd   *pwd = (struct passwd *)NULL;
    ns_ldap_result_t    *result = be->result;
    ns_ldap_attr_t  *attrptr;
    int     have_uid = 0;
    int     have_uidn = 0;
    int     have_gidn = 0;

#ifdef  DEBUG
    (void) fprintf(stdout, "\n[getpwnam.c: _nss_ldap_passwd2ent]\n");
#endif  /* DEBUG */

    buffer = argp->buf.buffer;
    buflen = (size_t)argp->buf.buflen;
    if (!argp->buf.result) {
        nss_result = (int)NSS_STR_PARSE_ERANGE;
        goto result_pwd2ent;
    }
    pwd = (struct passwd *)argp->buf.result;
    ceiling = buffer + buflen;
    nullstring = (buffer + (buflen - 1));

    nss_result = (int)NSS_STR_PARSE_SUCCESS;
    (void) memset(buffer, 0, buflen);

    /*
     * need to always return password as "x"
     * so put "x" at top of the buffer
     */
    ptr2x = buffer;
    *buffer++ = 'x';
    *buffer++ = '\0';

    attrptr = getattr(result, 0);
    if (attrptr == NULL) {
        nss_result = (int)NSS_STR_PARSE_PARSE;
        goto result_pwd2ent;
    }

    pwd->pw_gecos = nullstring;
    pwd->pw_dir = nullstring;
    pwd->pw_shell = nullstring;

    for (i = 0; i < result->entry->attr_count; i++) {
        attrptr = getattr(result, i);
        if (attrptr == NULL) {
            nss_result = (int)NSS_STR_PARSE_PARSE;
            goto result_pwd2ent;
        }
        if (strcasecmp(attrptr->attrname, _PWD_UID) == 0) {
            if ((attrptr->attrvalue[0] == NULL) ||
                (len = strlen(attrptr->attrvalue[0])) < 1) {
                nss_result = (int)NSS_STR_PARSE_PARSE;
                goto result_pwd2ent;
            }
            pwd->pw_name = buffer;
            buffer += len + 1;
            if (buffer >= ceiling) {
                nss_result = (int)NSS_STR_PARSE_ERANGE;
                goto result_pwd2ent;
            }
            (void) strcpy(pwd->pw_name, attrptr->attrvalue[0]);
            have_uid = 1;
            continue;
        }
        if (strcasecmp(attrptr->attrname, _PWD_UIDNUMBER) == 0) {
            if (attrptr->attrvalue[0] == '\0') {
                nss_result = (int)NSS_STR_PARSE_PARSE;
                goto result_pwd2ent;
            }
            pwd->pw_uid = strtol(attrptr->attrvalue[0],
                        (char **)NULL, 10);
            have_uidn = 1;
            continue;
        }
        if (strcasecmp(attrptr->attrname, _PWD_GIDNUMBER) == 0) {
            if (attrptr->attrvalue[0] == '\0') {
                nss_result = (int)NSS_STR_PARSE_PARSE;
                goto result_pwd2ent;
            }
            pwd->pw_gid = strtol(attrptr->attrvalue[0],
                        (char **)NULL, 10);
            have_gidn = 1;
            continue;
        }
        if ((strcasecmp(attrptr->attrname, _PWD_GECOS) == 0) &&
            (attrptr->value_count > 0)) {
            if ((attrptr->attrvalue[0] == NULL) ||
                (len = strlen(attrptr->attrvalue[0])) < 1) {
                pwd->pw_gecos = nullstring;
            } else {
                pwd->pw_gecos = buffer;
                buffer += len + 1;
                if (buffer >= ceiling) {
                    nss_result = (int)NSS_STR_PARSE_ERANGE;
                    goto result_pwd2ent;
                }
                (void) strcpy(pwd->pw_gecos,
                        attrptr->attrvalue[0]);
            }
            continue;
        }
        if ((strcasecmp(attrptr->attrname, _PWD_HOMEDIRECTORY) == 0) &&
            (attrptr->value_count > 0)) {
            if ((attrptr->attrvalue[0] == NULL) ||
                (len = strlen(attrptr->attrvalue[0])) < 1) {
                pwd->pw_dir = nullstring;
            } else {
                pwd->pw_dir = buffer;
                buffer += len + 1;
                if (buffer >= ceiling) {
                    nss_result = (int)NSS_STR_PARSE_ERANGE;
                    goto result_pwd2ent;
                }
                (void) strcpy(pwd->pw_dir,
                    attrptr->attrvalue[0]);
            }
            continue;
        }
        if ((strcasecmp(attrptr->attrname, _PWD_LOGINSHELL) == 0) &&
            (attrptr->value_count > 0)) {
            if ((attrptr->attrvalue[0] == NULL) ||
                (len = strlen(attrptr->attrvalue[0])) < 1) {
                pwd->pw_shell = nullstring;
            } else {
                pwd->pw_shell = buffer;
                buffer += len + 1;
                if (buffer >= ceiling) {
                    nss_result = (int)NSS_STR_PARSE_ERANGE;
                    goto result_pwd2ent;
                }
                (void) strcpy(pwd->pw_shell,
                    attrptr->attrvalue[0]);
            }
            continue;
        }
    }

    /* error if missing required attributes */
    if (have_uid == 0 || have_uidn == 0 || have_gidn == 0) {
        nss_result = (int)NSS_STR_PARSE_PARSE;
    }

    pwd->pw_age = nullstring;
    pwd->pw_comment = nullstring;
    pwd->pw_passwd = ptr2x;

#ifdef  DEBUG
    (void) fprintf(stdout, "\n[getpwnam.c: _nss_ldap_passwd2ent]\n");
    (void) fprintf(stdout, "       pw_name: [%s]\n", pwd->pw_name);
    (void) fprintf(stdout, "        pw_uid: [%ld]\n", pwd->pw_uid);
    (void) fprintf(stdout, "        pw_gid: [%ld]\n", pwd->pw_gid);
    (void) fprintf(stdout, "      pw_gecos: [%s]\n", pwd->pw_gecos);
    (void) fprintf(stdout, "        pw_dir: [%s]\n", pwd->pw_dir);
    (void) fprintf(stdout, "      pw_shell: [%s]\n", pwd->pw_shell);
#endif  /* DEBUG */

result_pwd2ent:

    (void) __ns_ldap_freeResult(&be->result);
    return ((int)nss_result);
}


/*
 * getbyname gets a passwd entry by uid name. This function constructs an ldap
 * search filter using the name invocation parameter and the getpwnam search
 * filter defined. Once the filter is constructed, we search for a matching
 * entry and marshal the data results into struct passwd for the frontend
 * process. The function _nss_ldap_passwd2ent performs the data marshaling.
 */

static nss_status_t
getbyname(ldap_backend_ptr be, void *a)
{
    nss_XbyY_args_t *argp = (nss_XbyY_args_t *)a;
    char        searchfilter[SEARCHFILTERLEN];
    char        userdata[SEARCHFILTERLEN];
    char        name[SEARCHFILTERLEN];
    int     ret;

#ifdef  DEBUG
    (void) fprintf(stdout, "\n[getpwnam.c: getbyname]\n");
#endif  /* DEBUG */

    if (_ldap_filter_name(name, argp->key.name, sizeof (name)) != 0)
        return ((nss_status_t)NSS_NOTFOUND);

    ret = snprintf(searchfilter, sizeof (searchfilter), _F_GETPWNAM, name);
    if (ret >= sizeof (searchfilter) || ret < 0)
        return ((nss_status_t)NSS_NOTFOUND);

    ret = snprintf(userdata, sizeof (userdata), _F_GETPWNAM_SSD, name);
    if (ret >= sizeof (userdata) || ret < 0)
        return ((nss_status_t)NSS_NOTFOUND);

    return ((nss_status_t)_nss_ldap_lookup(be, argp,
        _PASSWD, searchfilter, NULL,
        _merge_SSD_filter, userdata));
}


/*
 * getbyuid gets a passwd entry by uid number. This function constructs an ldap
 * search filter using the uid invocation parameter and the getpwuid search
 * filter defined. Once the filter is constructed, we search for a matching
 * entry and marshal the data results into struct passwd for the frontend
 * process. The function _nss_ldap_passwd2ent performs the data marshaling.
 */

static nss_status_t
getbyuid(ldap_backend_ptr be, void *a)
{
    nss_XbyY_args_t *argp = (nss_XbyY_args_t *)a;
    char        searchfilter[SEARCHFILTERLEN];
    char        userdata[SEARCHFILTERLEN];
    int     ret;

#ifdef  DEBUG
    (void) fprintf(stdout, "\n[getpwnam.c: getbyuid]\n");
#endif  /* DEBUG */

    ret = snprintf(searchfilter, sizeof (searchfilter),
        _F_GETPWUID, (long)argp->key.uid);
    if (ret >= sizeof (searchfilter) || ret < 0)
        return ((nss_status_t)NSS_NOTFOUND);

    ret = snprintf(userdata, sizeof (userdata),
        _F_GETPWUID_SSD, (long)argp->key.uid);
    if (ret >= sizeof (userdata) || ret < 0)
        return ((nss_status_t)NSS_NOTFOUND);

    return ((nss_status_t)_nss_ldap_lookup(be, argp,
        _PASSWD, searchfilter, NULL,
        _merge_SSD_filter, userdata));
}

static ldap_backend_op_t passwd_ops[] = {
    _nss_ldap_destr,
    _nss_ldap_endent,
    _nss_ldap_setent,
    _nss_ldap_getent,
    getbyname,
    getbyuid
};


/*
 * _nss_ldap_passwd_constr is where life begins. This function calls the
 * generic ldap constructor function to define and build the abstract
 * data types required to support ldap operations.
 */

/*ARGSUSED0*/
nss_backend_t *
_nss_ldap_passwd_constr(const char *dummy1, const char *dummy2,
            const char *dummy3)
{

#ifdef  DEBUG
    (void) fprintf(stdout, "\n[getpwnam.c: _nss_ldap_passwd_constr]\n");
#endif  /* DEBUG */

    return ((nss_backend_t *)_nss_ldap_constr(passwd_ops,
            sizeof (passwd_ops)/sizeof (passwd_ops[0]),
            _PASSWD, pwd_attrs, _nss_ldap_passwd2ent));
}