getpublickey.c

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/*
 * Copyright (c) 2009, Sun Microsystems, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 * - Neither the name of Sun Microsystems, Inc. nor the names of its
 *   contributors may be used to endorse or promote products derived
 *   from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
/*
#include <sys/cdefs.h>
*/
 
/*
 * publickey.c
 * Copyright (C) 1986, Sun Microsystems, Inc.
 */
 
/*
 * Public key lookup routines
 */
#include <wintirpc.h>
#ifndef _WIN32
#include <stdio.h>
//#include <pwd.h>
#include <rpc/rpc.h>
#include <rpc/key_prot.h>
#include <rpcsvc/yp_prot.h>
#include <rpcsvc/ypclnt.h>
#include <string.h>
#include <stdlib.h>
 
#define PKFILE "/etc/publickey"
 
/*
 * Hack to let ypserv/rpc.nisd use AUTH_DES.
 */
int (*__getpublickey_LOCAL)() = 0;
 
/*
 * Get somebody's public key
 */
int
__getpublickey_real(netname, publickey)
    char *netname;
    char *publickey;
{
    char lookup[3 * HEXKEYBYTES];
    char *p;
 
    if (publickey == NULL)
        return (0);
    if (!getpublicandprivatekey(netname, lookup))
        return (0);
    p = strchr(lookup, ':');
    if (p == NULL) {
        return (0);
    }
    *p = '\0';
    (void) strncpy(publickey, lookup, HEXKEYBYTES);
    publickey[HEXKEYBYTES] = '\0';
    return (1);
}
 
/*
 * reads the file /etc/publickey looking for a + to optionally go to the
 * yellow pages
 */
 
int
getpublicandprivatekey(key, ret)
    char *key;
    char *ret;
{
    char buf[1024]; /* big enough */
    char *res;
    FILE *fd;
    char *mkey;
    char *mval;
 
    fd = fopen(PKFILE, "r");
    if (fd == NULL)
        return (0);
    for (;;) {
        res = fgets(buf, sizeof(buf), fd);
        if (res == NULL) {
            fclose(fd);
            return (0);
        }
        if (res[0] == '#')
            continue;
        else if (res[0] == '+') {
#ifdef YP
            char *PKMAP = "publickey.byname";
            char *lookup;
            char *domain;
            int err;
            int len;
 
            err = yp_get_default_domain(&domain);
            if (err) {
                continue;
            }
            lookup = NULL;
            err = yp_match(domain, PKMAP, key, strlen(key), &lookup, &len);
            if (err) {
#ifdef DEBUG
                fprintf(stderr, "match failed error %d\n", err);
#endif
                continue;
            }
            lookup[len] = 0;
            strcpy(ret, lookup);
            fclose(fd);
            free(lookup);
            return (2);
#else /* YP */
#ifdef DEBUG
            fprintf(stderr,
"Bad record in %s '+' -- NIS not supported in this library copy\n", PKFILE);
#endif /* DEBUG */
            continue;
#endif /* YP */
        } else {
            mkey = strsep(&res, "\t ");
            if (mkey == NULL) {
                fprintf(stderr,
                "Bad record in %s -- %s", PKFILE, buf);
                continue;
            }
            do {
                mval = strsep(&res, " \t#\n");
            } while (mval != NULL && !*mval);
            if (mval == NULL) {
                fprintf(stderr,
            "Bad record in %s val problem - %s", PKFILE, buf);
                continue;
            }
            if (strcmp(mkey, key) == 0) {
                strcpy(ret, mval);
                fclose(fd);
                return (1);
            }
        }
    }
}
 
int getpublickey(netname, publickey)
    const char *netname;
    char *publickey;
{
    if (__getpublickey_LOCAL != NULL)
        return(__getpublickey_LOCAL(netname, publickey));
    else
        return(__getpublickey_real(netname, publickey));
}
#endif  /* ! _WIN32 */