cmd/keyserv/newkey.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.
 */

/*  Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*    All Rights Reserved   */

/*
 * University Copyright- Copyright (c) 1982, 1986, 1988
 * The Regents of the University of California
 * All Rights Reserved
 *
 * University Acknowledgment- Portions of this document are derived from
 * software developed by the University of California, Berkeley, and its
 * contributors.
 */

/*
 * Administrative tool to add a new user to the publickey database
 */
#include <stdio.h>
#include <stdlib.h>
#include <rpc/rpc.h>
#include <rpc/key_prot.h>
#include <rpcsvc/ypclnt.h>
#include <sys/wait.h>
#include <netdb.h>
#include <pwd.h>
#include <shadow.h>
#include <crypt.h>
#include <string.h>
#include <sys/resource.h>
#include <netdir.h>
#include <rpcsvc/nis.h>

#define MAXMAPNAMELEN   256
#define MAXPASSWD   256 /* max significant characters in password */

#define PK_FILES    1
#define PK_YP       2
#define PK_LDAP     4
#define DESCREDPASSLEN  sizeof (des_block)

extern  int optind;
extern  char *optarg;
extern  int __getnetnamebyuid();
extern  int self_check(char *name);

#define local_host(host_name)   self_check(host_name)

char    *program_name;
int     pk_database;
static  char    *get_password();
static  char *basename();
static  char SHELL[] = "/bin/sh";
static  char YPDBPATH[] = "/var/yp";
static  char PKMAP[] = "publickey.byname";
static  char UPDATEFILE[] = "updaters";
static  char PKFILE[] = "/etc/publickey";
static  void usage(void);

int
main(int argc, char *argv[])
{
    char    name[MAXNETNAMELEN + 1];
    char    public[HEXKEYBYTES + 1];
    char    secret[HEXKEYBYTES + 1];
    char    crypt1[HEXKEYBYTES + KEYCHECKSUMSIZE + 1];
    int status;
    char    *pass, *target_host = NULL,
        *username = NULL, *pk_service = NULL;
    char    short_pass[DESCREDPASSLEN + 1];
    struct passwd   *pw;
    NCONF_HANDLE    *nc_handle;
    struct  netconfig *nconf;
    struct  nd_hostserv service;
    struct  nd_addrlist *addrs;
    bool_t  validhost;
    uid_t   uid;
    int c;
    char    host_pname[NIS_MAXNAMELEN];

    program_name = argv[0];
    while ((c = getopt(argc, argv, "s:u:h:")) != -1) {
        switch (c) {
        case 's':
            if (pk_service == NULL)
                pk_service = optarg;
            else
                usage();
            break;
        case 'u':
            if (username || target_host)
                usage();
            username = optarg;
            break;
        case 'h':
            if (username || target_host)
                usage();
            target_host = optarg;
            break;
        default:
            usage();
        }
    }

    if (optind < argc || (username == 0 && target_host == 0)) {
        usage();
    }

    if ((pk_database = get_pk_source(pk_service)) == 0)
        usage();

    if (geteuid() != 0) {
        (void) fprintf(stderr, "Must be superuser to run %s\n",
            program_name);
        exit(1);
    }

    if (username) {
        pw = getpwnam(username);
        if (pw == NULL) {
            (void) fprintf(stderr, "%s: unknown user: '%s'\n",
                program_name, username);
            exit(1);
        }
        uid = pw->pw_uid;
        if (uid == 0) {
            if (! getnetname(name)) {
                (void) fprintf(stderr,
            "%s: could not get the equivalent netname for %s\n",
                    program_name, username);
                usage();
            }
            if (gethostname(host_pname, NIS_MAXNAMELEN)
                < 0) {
                (void) fprintf(stderr,
            "%s: could not get the hostname for %s\n",
                    program_name, username);
                usage();
            }
            target_host = host_pname;
        }
        if (__getnetnamebyuid(name, uid) == 0) {
            (void) fprintf(stderr,
            "%s: could not get the equivalent netname for %s\n",
                program_name, username);
            usage();
        }
    } else {
        /* -h hostname option */
        service.h_host = target_host;
        service.h_serv = NULL;
        validhost = FALSE;
        /* verify if this is a valid hostname */
        nc_handle = setnetconfig();
        if (nc_handle == NULL) {
            /* fails to open netconfig file */
            (void) fprintf(stderr,
            "%s: failed in routine setnetconfig()\n",
                program_name);
            exit(2);
        }
        while (nconf = getnetconfig(nc_handle)) {
            /* check to see if hostname exists for this transport */
            if ((netdir_getbyname(nconf, &service, &addrs) == 0) &&
                (addrs->n_cnt != 0)) {
                /* at least one valid address */
                validhost = TRUE;
                break;
            }
        }
        endnetconfig(nc_handle);
        if (!validhost) {
            (void) fprintf(stderr, "%s: unknown host: %s\n",
                program_name, target_host);
            exit(1);
        }
        (void) host2netname(name, target_host, (char *)NULL);
        uid = 0;
    }

    (void) fprintf(stdout, "Adding new key for %s.\n", name);
    pass = get_password(uid, target_host, username);

    if (pass == NULL)
        exit(1);

    (void) strlcpy(short_pass, pass, sizeof (short_pass));
    (void) __gen_dhkeys(public, secret, short_pass);

    (void) memcpy(crypt1, secret, HEXKEYBYTES);
    (void) memcpy(crypt1 + HEXKEYBYTES, secret, KEYCHECKSUMSIZE);
    crypt1[HEXKEYBYTES + KEYCHECKSUMSIZE] = 0;
    xencrypt(crypt1, short_pass);

    if (status = setpublicmap(name, public, crypt1, pk_database,
        short_pass)) {
        switch (pk_database) {
        case PK_YP:
            (void) fprintf(stderr,
                "%s: unable to update NIS database (%u): %s\n",
                program_name, status,
                yperr_string(status));
            break;
        case PK_FILES:
            (void) fprintf(stderr,
                "%s: hence, unable to update publickey database\n",
                program_name);
            break;
        default:
            (void) fprintf(stderr,
                "%s: could not update unknown database: %d\n",
                program_name, pk_database);
        }
        exit(1);
    }
    return (0);
}

/*
 * Set the entry in the public key file
 */
int
setpublicmap(name, public, secret, database, pw)
    int database;
    char *name;
    char *public;
    char *secret;
    char *pw;
{
    char pkent[HEXKEYBYTES + HEXKEYBYTES + KEYCHECKSUMSIZE + 2];
    char *domain = NULL;
    char *master = NULL;
    char hostname[MAXHOSTNAMELEN+1];

    (void) sprintf(pkent, "%s:%s", public, secret);
    switch (database) {
    case PK_YP:
        /* check that we're on the master server */
        (void) yp_get_default_domain(&domain);
        if (yp_master(domain, PKMAP, &master) != 0) {
            (void) fprintf(stderr,
            "%s: cannot find master of NIS publickey database\n",
                program_name);
            exit(1);
        }
        if (gethostname(hostname, MAXHOSTNAMELEN) < 0) {
            (void) fprintf(stderr,
                "%s: cannot find my own host name\n",
                program_name);
            exit(1);
        }
        if (strcmp(master, hostname) != 0) {
            (void) fprintf(stderr,
            "%s: can only be used on NIS master machine '%s'\n",
                program_name, master);
            exit(1);
        }

        if (chdir(YPDBPATH) < 0) {
            (void) fprintf(stderr, "%s: cannot chdir to %s",
            program_name, YPDBPATH);
        }
        (void) fprintf(stdout,
            "Please wait for the database to get updated ...\n");
        return (mapupdate(name, PKMAP, YPOP_STORE, pkent));
    case PK_FILES:
        return (localupdate(name, PKFILE, YPOP_STORE, pkent));
    case PK_LDAP:
        return (ldap_update("dh192-0", name, public, secret, pw));
    default:
        break;
    }
    return (1);
}

void
usage(void)
{
    (void) fprintf(stderr,
        "usage:\t%s -u username [-s ldap | nis | files]\n",
        program_name);
    (void) fprintf(stderr,
        "\t%s -h hostname [-s ldap | nis | files]\n",
        program_name);
    exit(1);
}

/*
 * The parameters passed into the routine get_password and the
 * return values are as follows:
 * If the -h flag was specified on the command line:
 * (a) username is null
 * (b) target_host is non-null
 * (c) uid is 0
 * (d) the login password of root on target_host is returned
 *
 * If the -u flag was specified on the command line:
 * (a) username is non-null
 * (b) target_host is null in all cases except when username is root;
 *  in that case target_host is set to the local host
 * (c) uid is set to the username's uid
 * (d) the login password of the user <username> is returned
 */
static char *
get_password(uid, target_host, username)
uid_t   uid;
char    *target_host;
char    *username;
{
    static  char    password[MAXPASSWD+1];
    char        prompt[MAXPASSWD+MAXHOSTNAMELEN+64];
    char        *encrypted_password,
            *login_password = NULL,
            *pass = NULL;
    struct  passwd  *pw;
    struct  spwd    *spw;

    if ((username != 0) ||
        (target_host != 0) && (local_host(target_host))) {

    /*
     * "-u username" or "-h localhost" was specified on the
     * command line
     */

    pw = getpwuid(uid);

    if (! pw) {
        (void) fprintf(stderr,
            "%s: unable to locate password record for uid %d\n",
            program_name, uid);
        return (0);
    }
    spw = getspnam(pw->pw_name);
    if (spw)
        login_password = spw->sp_pwdp;

    if (! login_password || (strlen(login_password) == 0)) {
        (void) fprintf(stderr,
            "%s: unable to locate shadow password record for %s\n",
            program_name, pw->pw_name);
        return (0);
    }

    if (uid == 0) {
        (void) sprintf(prompt, "Enter local root login password:");
    } else
        (void) sprintf(prompt, "Enter %s's login password:",
        pw->pw_name);

    pass = getpassphrase(prompt);
    if (pass && strlen(pass) == 0) {
        (void) fprintf(stderr, "%s: Invalid password.\n",
            program_name);
        return (0);
    }
    strcpy(password, pass);
    encrypted_password = crypt(password, login_password);

    /* Verify that password supplied matches login password */
    if (strcmp(encrypted_password, login_password) != 0) {
        /*
         * Give another chance for typo
         */
        pass = getpassphrase("Please retype password:");
        if (pass && strlen(pass) == 0) {
        (void) fprintf(stderr, "%s: Invalid password.\n",
            program_name);
        return (0);
        }
        strcpy(password, pass);
        encrypted_password = crypt(password, login_password);
        if (strcmp(encrypted_password, login_password) != 0) {
            (void) fprintf(stderr,
            "%s: ERROR, invalid password.\n",
            program_name);
            return (0);
        }
    }
    } else {
        /*
         * "-h remotehost" was specified on the command line
         *
         * Since we cannot verify the root password of the remote
         * host we have to trust what the user inputs. We can,
         * however, reduce the possibility of an  error by prompting
         * the user to enter the target host's password twice and
         * comparing those two. We can also authenticate the
         * user to be root by checking the real uid.
         */

        if (getuid() != 0) {
            (void) fprintf(stderr, "Must be superuser to run %s\n",
                program_name);
            return (0);
        }

        (void) sprintf(prompt,
            "Enter %s's root login password:",
            target_host);
        pass = getpassphrase(prompt);
        if (!pass) {
            (void) fprintf(stderr,
                "%s: getpass failed.\n",
                program_name);
            return (0);
        }
        if (!*pass) {
            (void) fprintf(stderr,
                "%s: Invalid root password.\n",
                program_name);
            return (0);
        }
        strcpy(password, pass);

        /*
         * Now re-enter the password and compare it to the
         * one just read.
         */
        (void) sprintf(prompt,
            "Please confirm %s's root login password:",
            target_host);
        pass = getpassphrase(prompt);
        if (!pass) {
            (void) fprintf(stderr,
                "%s: getpass failed.\n",
                program_name);
            return (0);
        }
        if (!*pass) {
            (void) fprintf(stderr,
                "%s: Invalid root password.\n",
                program_name);
            return (0);
        }
        if (strcmp(pass, password) != 0) {
            (void) fprintf(stderr,
                "%s: Password Incorrect.\n",
                program_name);
            return (0);
        }
    }

    return (password);
}