common/uwin/rcmd.c

	rcmd.c revision da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968
#include "FEATURE/uwin"

#if !_UWIN || _lib_rcmd

void _STUB_rcmd(){}

#else

/*
 * Copyright (c) 1983
 *  The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. Neither the name of the University 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 REGENTS 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 REGENTS 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.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)rcmd.c  5.17 (Berkeley) 6/27/88";
#endif /* LIBC_SCCS and not lint */

#include "rlib.h"
#include <pwd.h>
#include <sys/file.h>
#include <sys/signal.h>
#if 1
#define _PATH_HEQUIV    "/etc/hosts.equiv"
#endif
#include <sys/stat.h>

#if NLS
#include "nl_types.h"
#endif

#ifdef YP
#include <rpcsvc/ypclnt.h>
extern void setnetgrent(const char *);
extern void endnetgrent(void);
extern int getnetgrent(char **, char **, char **);
static char *nisdomain = NULL;
static int _checknetgrouphost(const char *, const char *, int);
static int _checknetgroupuser(const char *, const char *);
#endif

#if defined(__EXPORT__)
#define extern      __EXPORT__
#endif

extern int rresvport(int *alport)
{
    struct sockaddr_in sin;
    int s;

    sin.sin_family = AF_INET;
    sin.sin_addr.s_addr = INADDR_ANY;
    s = socket(AF_INET, SOCK_STREAM, 0);
    if (s < 0)
        return (-1);
    for (;;) {
        sin.sin_port = htons((u_short)*alport);
        if (bind(s, (struct sockaddr *)&sin, sizeof (sin)) >= 0)
            return (s);
        if (errno != EADDRINUSE) {
            (void) close(s);
            return (-1);
        }
        (*alport)--;
        if (*alport == IPPORT_RESERVED/2) {
            (void) close(s);
            errno = EAGAIN;     /* close */
            return (-1);
        }
    }
}

extern int rcmd(char **ahost, unsigned short rport, const char *locuser, const char *remuser, const char *cmd, int *fd2p)
{
    int s, timo = 1;
#ifdef F_SETOWN
    pid_t pid;
#endif
#ifdef _POSIX_SOURCE
    sigset_t set, oset;
#else
    long oldmask;
#endif
    struct sockaddr_in sin, from;
    char c;
    int lport = IPPORT_RESERVED - 1;
    struct hostent *hp;

#if NLS
    libc_nls_init();
#endif

#ifdef F_SETOWN
    pid = getpid();
#endif
    hp = gethostbyname(*ahost);
    if (hp == 0) {
#if NLS
        fprintf(stderr, "%s: %s\n", *ahost,
            catgets(_libc_cat, HerrorListSet,
            2, "unknown host"));
#else
        fprintf(stderr, "%s: unknown host\n", *ahost);
#endif
        return (-1);
    }
    *ahost = hp->h_name;
#ifdef SIGURG
#ifdef _POSIX_SOURCE
    sigemptyset (&set);
    sigaddset (&set, SIGURG);
    sigprocmask (SIG_BLOCK, &set, &oset);
#else
    oldmask = sigblock(sigmask(SIGURG));
#endif
#endif
    for (;;) {
        s = rresvport(&lport);
        if (s < 0) {
            if (errno == EAGAIN)
#if NLS
                fprintf(stderr, "socket: %s\n",
                    catgets(_libc_cat, NetMiscSet,
                    NetMiscAllPortsInUse,
                    "All ports in use"));
#else
            fprintf(stderr, "socket: All ports in use\n");
#endif
            else
#if NLS
    perror(catgets(_libc_cat, NetMiscSet,
        NetMiscRcmdSocket,
        "rcmd: socket"));
#else
perror("rcmd: socket");
#endif
#ifdef SIGURG
#ifdef _POSIX_SOURCE
sigprocmask (SIG_SETMASK, &oset,
(sigset_t *)NULL);
#else
sigsetmask(oldmask);
#endif
#endif
return (-1);
        }
#ifdef F_SETOWN
        fcntl(s, F_SETOWN, pid);
#endif
        sin.sin_family = hp->h_addrtype;
        bcopy(hp->h_addr_list[0], (caddr_t)&sin.sin_addr, hp->h_length);
        sin.sin_port = rport;
        if (connect(s, (struct sockaddr *)&sin, sizeof (sin)) >= 0)
            break;
        (void) close(s);
        if (errno == EADDRINUSE) {
            lport--;
            continue;
        }
        if (errno == ECONNREFUSED && timo <= 16) {
            sleep(timo);
            timo *= 2;
            continue;
        }
        if (hp->h_addr_list[1] != NULL) {
            int oerrno = errno;

            fprintf(stderr,
#if NLS
                "%s %s: ", catgets(_libc_cat, NetMiscSet,
                NetMiscAllPortsInUse,
                "connect to address"),
                inet_ntoa(sin.sin_addr));

#else

            "connect to address %s: ", inet_ntoa(sin.sin_addr));
#endif
            errno = oerrno;
            perror(0);
            hp->h_addr_list++;
            bcopy(hp->h_addr_list[0], (caddr_t)&sin.sin_addr,
                hp->h_length);

#if NLS
            fprintf(stderr, catgets(_libc_cat, NetMiscSet,
                NetMiscTrying,
                "Trying %s...\n"),
#else
                fprintf(stderr, "Trying %s...\n",
#endif
                inet_ntoa(sin.sin_addr));
                continue;
        }
        perror(hp->h_name);
#ifdef SIGURG
#ifdef _POSIX_SOURCE
            sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL);
#else
            sigsetmask(oldmask);
#endif
#endif
            return (-1);
    }
    lport--;
        if (fd2p == 0) {
        write(s, "", 1);
            lport = 0;
    } else {
        char num[8];
            int s2 = rresvport(&lport), s3;
            int len = sizeof (from);

            if (s2 < 0)
            goto bad;
            listen(s2, 1);
            (void) snprintf(num, sizeof(num), "%d", lport);
            if (write(s, num, strlen(num)+1) != strlen(num)+1) {
#if NLS
            perror(catgets(_libc_cat, NetMiscSet,
                NetMiscSettingUpStderr,
                "write: setting up stderr"));
#else
                perror("write: setting up stderr");
#endif
                (void) close(s2);
                goto bad;
        }
        s3 = accept(s2, (struct sockaddr *)&from, &len);
            (void) close(s2);
            if (s3 < 0) {
#if NLS
            perror(catgets(_libc_cat, NetMiscSet,
                NetMiscAccept,
                "accept"));
#else
                perror("accept");
#endif
                lport = 0;
                goto bad;
        }
        *fd2p = s3;
            from.sin_port = ntohs((u_short)from.sin_port);
            if (from.sin_family != AF_INET ||
            from.sin_port >= IPPORT_RESERVED) {
            fprintf(stderr,
#if NLS
                "%s\n",
                catgets(_libc_cat, NetMiscSet,
                NetMiscProtocolFailure,
                "socket: protocol failure in circuit setup."));
#else
                "socket: protocol failure in circuit setup.\n");
#endif
            goto bad2;
        }
    }
    (void) write(s, locuser, strlen(locuser)+1);
    (void) write(s, remuser, strlen(remuser)+1);
    (void) write(s, cmd, strlen(cmd)+1);
    if (read(s, &c, 1) != 1) {
        perror(*ahost);
        goto bad2;
    }
    if (c != 0) {
        while (read(s, &c, 1) == 1) {
            (void) write(2, &c, 1);
            if (c == '\n')
                break;
        }
        goto bad2;
    }
#ifdef SIGURG
#ifdef _POSIX_SOURCE
    sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL);
#else
    sigsetmask(oldmask);
#endif
#endif
    return (s);
bad2:
    if (lport)
        (void) close(*fd2p);
bad:
    (void) close(s);
#ifdef SIGURG
#ifdef _POSIX_SOURCE
    sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL);
#else
    sigsetmask(oldmask);
#endif
#endif
    return (-1);
}

extern int ruserok(const char *rhost, int superuser, const char *ruser, const char *luser)
{
    FILE *hostf;
    char fhost[MAXHOSTNAMELEN];
    int first = 1;
    register const char *sp;
    register char *p;
    int baselen = -1;
    uid_t saveuid;

    saveuid = geteuid();
    sp = rhost;
    p = fhost;
    while (*sp) {
        if (*sp == '.') {
            if (baselen == -1)
                baselen = sp - rhost;
            *p++ = *sp++;
        } else {
            *p++ = isupper(*sp) ? tolower(*sp++) : *sp++;
        }
    }
    *p = '\0';
    hostf = superuser ? (FILE *)0 : fopen(_PATH_HEQUIV, "r");
again:
    if (hostf) {
        if (!_validuser(hostf, fhost, luser, ruser, baselen)) {
            (void) fclose(hostf);
            seteuid(saveuid);
            return(0);
        }
        (void) fclose(hostf);
    }
    if (first == 1) {
        struct stat sbuf;
        struct passwd *pwd;
        char pbuf[MAXPATHLEN];

        first = 0;
        if ((pwd = getpwnam(luser)) == NULL)
            return(-1);
        (void)strcpy(pbuf, pwd->pw_dir);
        (void)strcat(pbuf, "/.rhosts");
        (void)seteuid(pwd->pw_uid);
        if ((hostf = fopen(pbuf, "r")) == NULL) {
            seteuid(saveuid);
            return(-1);
        }
        (void)fstat(fileno(hostf), &sbuf);
        if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid) {
            fclose(hostf);
            seteuid(saveuid);
            return(-1);
        }
        goto again;
    }
    seteuid(saveuid);
    return (-1);
}

int
_validuser(FILE *hostf, const char *rhost, const char *luser,
const char *ruser, int baselen)
{
    char *user;
    char ahost[MAXHOSTNAMELEN];
    register char *p;
    int hostvalid = 0;
    int uservalid = 0;

    while (fgets(ahost, sizeof (ahost), hostf)) {
        /* We need to get rid of all comments. */
        p = strchr (ahost, '#');
        if (p) *p = '\0';
        p = ahost;
        while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') {
            *p = isupper(*p) ? tolower(*p) : *p;
            p++;
        }
        if (*p == ' ' || *p == '\t') {
            *p++ = '\0';
            while (*p == ' ' || *p == '\t')
                p++;
            user = p;
            while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0')
                p++;
        } else
            user = p;
        *p = '\0';
    /* Adding new authentication -Nilendu */

        /* enable all host for + entry */
        if ('+' == ahost[0] && '\0' == ahost[1] )
            hostvalid = 1;

        /* enable all user for + entry */
        if ('+' == user[0] && '\0' == user[1] )
            uservalid = 1;

        /* disable all host for - entry */
        if ('-' == ahost[0] && '\0' == ahost[1] )
            hostvalid = 0;

        /* disable all user for - entry */
        if ('-' == user[0] && '\0' == user[1] )
            uservalid = 0;


#ifdef YP
        /* disable host from -hostname entry */
        if ('-' == ahost[0] && '@' != ahost[1]
            && _checkhost(rhost, &ahost[1], baselen))
            return -1;
        /* disable host from -@netgroup entry for host */
        if ('-' == ahost[0] && '@' == ahost[1] && '\0' != ahost[2]
            && _checknetgrouphost(rhost, &ahost[2], baselen))
            return -1;
        /* disable user from -user entry */
        if ('\0' != *user && user[0] == '-' && user[1] != '@'
            && !strcmp(&user[1], ruser))
            return -1;
        /* disable user from -@netgroup entry for user */
        if ('\0' != *user && user[0] == '-' && user[1] == '@'
            && user[2] != '\0' && _checknetgroupuser(ruser, &user[2]))
            return -1;
        /* enable host from +@netgroup entry for host */
        if ('+' == ahost[0] && '@' == ahost[1] && '\0' != ahost[2])
            hostvalid = _checknetgrouphost(rhost, &ahost[2], baselen);
            else
            hostvalid = _checkhost(rhost, ahost, baselen);
        /* enable user from +@netgroup entry for user */
        if ('\0' != *user && user[0] == '+'
            && user[1] == '@' && user[2] != '\0')
            uservalid = _checknetgroupuser(ruser, &user[2]);
            else
            uservalid = !strcmp(ruser, *user ? user : luser);

        if (hostvalid && uservalid)
            return 0;
#else
        hostvalid = hostvalid ? 1 : _checkhost(rhost, ahost, baselen);
        uservalid = uservalid ? 1 : !stricmp(ruser,*user ? user : luser);
        if (hostvalid && uservalid)
            return 0;

#endif /* YP */
        hostvalid = uservalid = 0;
    }
    return (-1);
}

int
_checkhost(const char *rhost, const char *lhost, int len)
{
    static char ldomain[MAXHOSTNAMELEN + 1];
    static char *domainp = NULL;
    static int nodomain = 0;
    register char *cp;

    if (len == -1)
        return(!strcmp(rhost, lhost));
    if (strncmp(rhost, lhost, len))
        return(0);
    if (!strcmp(rhost, lhost))
        return(1);
    if (*(lhost + len) != '\0')
        return(0);
    if (nodomain)
        return(0);
    if (!domainp) {
        if (gethostname(ldomain, sizeof(ldomain)) == -1) {
            nodomain = 1;
            return(0);
        }
        ldomain[MAXHOSTNAMELEN] = (char) 0;
        if ((domainp = index(ldomain, '.')) == (char *)NULL) {
            nodomain = 1;
            return(0);
        }
        for (cp = ++domainp; *cp; ++cp)
            if (isupper(*cp))
                *cp = tolower(*cp);
    }
    return(!strcmp(domainp, rhost + len +1));
}

#ifdef YP
static int
_checknetgrouphost(const char *rhost, const char *netgr, int baselen)
{
    char *host, *user, *domain;
    int status;

    if (NULL == nisdomain)
        yp_get_default_domain(&nisdomain);

    setnetgrent(netgr);
    while (1)
    {
        while (1 == (status = getnetgrent(&host, &user, &domain))
            && NULL == host
            && NULL != domain
            && 0 != strcmp(domain, nisdomain))
            ;  /* find valid host entry */

        if (0 == status || NULL == host)
        {
            endnetgrent();
            return 0;
        }

        if(1 == _checkhost(rhost, host, baselen))
        {
            endnetgrent();
            return 1;
        }
    }
}

static int
_checknetgroupuser(const char *ruser, const char *netgr)
{
    char *host, *user, *domain;
    int status;

    if (NULL == nisdomain)
        yp_get_default_domain(&nisdomain);

    setnetgrent(netgr);
    while (1)
    {
        while (1 == (status = getnetgrent(&host, &user, &domain))
            && NULL == user
            && NULL != domain
            && 0 != strcmp(domain, nisdomain))
            ;  /* find valid user entry */

        if (0 == status || NULL == user)
        {
            endnetgrent();
            return 0;
        }

        if(0 == strcmp(ruser, user))
        {
            endnetgrent();
            return 1;
        }
    }
}
#endif /* YP */

#endif