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/*

 * Copyright (C) 1998 WIDE Project.

 * 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 project 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 PROJECT 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 PROJECT 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.

 */

/*

 * Copyright (c) 1983, 1993, 1994

 *      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.

 * 4. 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      8.3 (Berkeley) 3/26/94";

#endif /* LIBC_SCCS and not lint */

#include <sys/param.h>

#include <sys/poll.h>

#include <sys/socket.h>

#include <sys/stat.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <alloca.h>

#include <signal.h>

#include <fcntl.h>

#include <netdb.h>

#include <unistd.h>

#include <pwd.h>

#include <errno.h>

#include <stdio.h>

#include <stdio_ext.h>

#include <ctype.h>

#include <string.h>

#include <libintl.h>

#include <stdlib.h>

#include <wchar.h>

#include <sys/uio.h>

#include "local.h"

int __ivaliduser (FILE *, u_int32_t, const char *, const char *);

static int __validuser2_sa (FILE *, struct sockaddr *, size_t,

                            const char *, const char *, const char *);

static int ruserok2_sa (struct sockaddr *ra, size_t ralen,

                        int superuser, const char *ruser,

                        const char *luser, const char *rhost);

static int ruserok_sa (struct sockaddr *ra, size_t ralen,

                        int superuser, const char *ruser,

                        const char *luser);

int iruserok_af (const void *raddr, int superuser, const char *ruser,

                 const char *luser, sa_family_t af);

int iruserok (u_int32_t raddr, int superuser, const char *ruser,

              const char *luser);

libc_hidden_proto (iruserok_af)

libc_freeres_ptr(static char *ahostbuf);

int

rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, af)

        char **ahost;

        u_short rport;

        const char *locuser, *remuser, *cmd;

        int *fd2p;

        sa_family_t af;

{

        char paddr[INET6_ADDRSTRLEN];

        struct addrinfo hints, *res, *ai;

        struct sockaddr_storage from;

        struct pollfd pfd[2];

        int32_t oldmask;

        pid_t pid;

        int s, lport, timo, error;

        char c;

        int refused;

        char num[8];

        ssize_t n;

        if (af != AF_INET && af != AF_INET6 && af != AF_UNSPEC)

          {

            __set_errno (EAFNOSUPPORT);

            return -1;

          }

        pid = __getpid();

        memset(&hints, '\0', sizeof(hints));

        hints.ai_flags = AI_CANONNAME;

        hints.ai_family = af;

        hints.ai_socktype = SOCK_STREAM;

        (void)snprintf(num, sizeof(num), "%d", ntohs(rport));

        error = getaddrinfo(*ahost, num, &hints, &res);

        if (error) {

                if (error == EAI_NONAME && *ahost != NULL) {

                        if (_IO_fwide (stderr, 0) > 0)

                                __fwprintf(stderr, L"%s: Unknown host\n",

                                           *ahost);

                        else

                                fprintf(stderr, "%s: Unknown host\n", *ahost);

                } else {

                        if (_IO_fwide (stderr, 0) > 0)

                                __fwprintf(stderr, L"rcmd: getaddrinfo: %s\n",

                                           gai_strerror(error));

                        else

                                fprintf(stderr, "rcmd: getaddrinfo: %s\n",

                                        gai_strerror(error));

                }

                return (-1);

        }

        pfd[0].events = POLLIN;

        pfd[1].events = POLLIN;

        if (res->ai_canonname){

                free (ahostbuf);

                ahostbuf = strdup (res->ai_canonname);

                if (ahostbuf == NULL) {

                        if (_IO_fwide (stderr, 0) > 0)

                                __fwprintf(stderr, L"%s",

                                           _("rcmd: Cannot allocate memory\n"));

                        else

                                fputs(_("rcmd: Cannot allocate memory\n"),

                                      stderr);

                        return (-1);

                }

                *ahost = ahostbuf;

        } else

                *ahost = NULL;

        ai = res;

        refused = 0;

        oldmask = __sigblock(sigmask(SIGURG));

        for (timo = 1, lport = IPPORT_RESERVED - 1;;) {

                char errbuf[200];

                s = rresvport_af(&lport, ai->ai_family);

                if (s < 0) {

                        if (errno == EAGAIN) {

                                if (_IO_fwide (stderr, 0) > 0)

                                        __fwprintf(stderr, L"%s",

                                                   _("rcmd: socket: All ports in use\n"));

                                else

                                        fputs(_("rcmd: socket: All ports in use\n"),

                                              stderr);

                        } else {

                                if (_IO_fwide (stderr, 0) > 0)

                                        __fwprintf(stderr,

                                                   L"rcmd: socket: %m\n");

                                else

                                        fprintf(stderr, "rcmd: socket: %m\n");

                        }

                        __sigsetmask(oldmask);

                        freeaddrinfo(res);

                        return -1;

                }

                __fcntl(s, F_SETOWN, pid);

                if (__connect(s, ai->ai_addr, ai->ai_addrlen) >= 0)

                        break;

                (void)__close(s);

                if (errno == EADDRINUSE) {

                        lport--;

                        continue;

                }

                if (errno == ECONNREFUSED)

                        refused = 1;

                if (ai->ai_next != NULL) {

                        int oerrno = errno;

                        char *buf = NULL;

                        getnameinfo(ai->ai_addr, ai->ai_addrlen,

                                    paddr, sizeof(paddr),

                                    NULL, 0,

                                    NI_NUMERICHOST);

                        if (__asprintf (&buf, _("connect to address %s: "),

                                        paddr) >= 0)

                          {

                            if (_IO_fwide (stderr, 0) > 0)

                              __fwprintf(stderr, L"%s", buf);

                            else

                              fputs (buf, stderr);

                            free (buf);

                          }

                        __set_errno (oerrno);

                        perror(0);

                        ai = ai->ai_next;

                        getnameinfo(ai->ai_addr, ai->ai_addrlen,

                                    paddr, sizeof(paddr),

                                    NULL, 0,

                                    NI_NUMERICHOST);

                        if (__asprintf (&buf, _("Trying %s...\n"), paddr) >= 0)

                          {

                            if (_IO_fwide (stderr, 0) > 0)

                              __fwprintf (stderr, L"%s", buf);

                            else

                              fputs (buf, stderr);

                            free (buf);

                          }

                        continue;

                }

                if (refused && timo <= 16) {

                        (void)sleep(timo);

                        timo *= 2;

                        ai = res;

                        refused = 0;

                        continue;

                }

                freeaddrinfo(res);

                if (_IO_fwide (stderr, 0) > 0)

                        (void)__fwprintf(stderr, L"%s: %s\n", *ahost,

                                         strerror_r(errno,

                                                      errbuf, sizeof (errbuf)));

                else

                        (void)fprintf(stderr, "%s: %s\n", *ahost,

                                      strerror_r(errno,

                                                   errbuf, sizeof (errbuf)));

                __sigsetmask(oldmask);

                return -1;

        }

        lport--;

        if (fd2p == 0) {

                __write(s, "", 1);

                lport = 0;

        } else {

                char num[8];

                int s2 = rresvport_af(&lport, ai->ai_family), s3;

                socklen_t len = ai->ai_addrlen;

                if (s2 < 0)

                        goto bad;

                listen(s2, 1);

                (void)snprintf(num, sizeof(num), "%d", lport);

                if (__write(s, num, strlen(num)+1) != (ssize_t)strlen(num)+1) {

                        char *buf = NULL;

                        if (__asprintf (&buf, _("\

rcmd: write (setting up stderr): %m\n")) >= 0)

                          {

                            if (_IO_fwide (stderr, 0) > 0)

                              __fwprintf(stderr, L"%s", buf);

                            else

                              fputs (buf, stderr);

                            free (buf);

                          }

                        (void)__close(s2);

                        goto bad;

                }

                pfd[0].fd = s;

                pfd[1].fd = s2;

                __set_errno (0);

                if (__poll (pfd, 2, -1) < 1 || (pfd[1].revents & POLLIN) == 0){

                        char *buf = NULL;

                        if ((errno != 0

                             && __asprintf(&buf, _("\

rcmd: poll (setting up stderr): %m\n")) >= 0)

                            || (errno == 0

                                && __asprintf(&buf, _("\

poll: protocol failure in circuit setup\n")) >= 0))

                          {

                            if (_IO_fwide (stderr, 0) > 0)

                              __fwprintf (stderr, L"%s", buf);

                            else

                              fputs (buf, stderr);

                            free  (buf);

                          }

                        (void)__close(s2);

                        goto bad;

                }

                s3 = TEMP_FAILURE_RETRY (accept(s2, (struct sockaddr *)&from,

                                                &len));

                switch (from.ss_family) {

                case AF_INET:

                        rport = ntohs(((struct sockaddr_in *)&from)->sin_port);

                        break;

                case AF_INET6:

                        rport = ntohs(((struct sockaddr_in6 *)&from)->sin6_port);

                        break;

                default:

                        rport = 0;

                        break;

                }

                (void)__close(s2);

                if (s3 < 0) {

                        if (_IO_fwide (stderr, 0) > 0)

                                (void)__fwprintf(stderr,

                                                 L"rcmd: accept: %m\n");

                        else

                                (void)fprintf(stderr,

                                              "rcmd: accept: %m\n");

                        lport = 0;

                        goto bad;

                }

                *fd2p = s3;

                if (rport >= IPPORT_RESERVED || rport < IPPORT_RESERVED / 2){

                        char *buf = NULL;

                        if (__asprintf(&buf, _("\

socket: protocol failure in circuit setup\n")) >= 0)

                          {

                            if (_IO_fwide (stderr, 0) > 0)

                              __fwprintf (stderr, L"%s", buf);

                            else

                              fputs (buf, stderr);

                            free (buf);

                          }

                        goto bad2;

                }

        }

        struct iovec iov[3] =

          {

            [0] = { .iov_base = (void *) locuser,

                    .iov_len = strlen (locuser) + 1 },

            [1] = { .iov_base = (void *) remuser,

                    .iov_len = strlen (remuser) + 1 },

            [2] = { .iov_base = (void *) cmd,

                    .iov_len = strlen (cmd) + 1 }

          };

        (void) TEMP_FAILURE_RETRY (writev (s, iov, 3));

        n = TEMP_FAILURE_RETRY (read(s, &c, 1));

        if (n != 1) {

                char *buf = NULL;

                if ((n == 0

                     && asprintf(&buf, _("rcmd: %s: short read"),

                                   *ahost) >= 0)

                    || (n != 0

                        && asprintf(&buf, "rcmd: %s: %m\n", *ahost) >= 0))

                  {

                    if (_IO_fwide (stderr, 0) > 0)

                      __fwprintf (stderr, L"%s", buf);

                    else

                      fputs (buf, stderr);

                    free (buf);

                  }

                goto bad2;

        }

        if (c != 0) {

                while (__read(s, &c, 1) == 1) {

                        (void)__write(STDERR_FILENO, &c, 1);

                        if (c == '\n')

                                break;

                }

                goto bad2;

        }

        __sigsetmask(oldmask);

        freeaddrinfo(res);

        return s;

bad2:

        if (lport)

                (void)__close(*fd2p);

bad:

        (void)__close(s);

        __sigsetmask(oldmask);

        freeaddrinfo(res);

        return -1;

}

libc_hidden_def (rcmd_af)

int

rcmd(ahost, rport, locuser, remuser, cmd, fd2p)

        char **ahost;

        u_short rport;

        const char *locuser, *remuser, *cmd;

        int *fd2p;

{

  return rcmd_af (ahost, rport, locuser, remuser, cmd, fd2p, AF_INET);

}

int

rresvport_af(alport, family)

        int *alport;

        sa_family_t family;

{

        struct sockaddr_storage ss;

        int s;

        size_t len;

        uint16_t *sport;

        switch(family){

        case AF_INET:

                len = sizeof(struct sockaddr_in);

                sport = &((struct sockaddr_in *)&ss)->sin_port;

                break;

        case AF_INET6:

                len = sizeof(struct sockaddr_in6);

                sport = &((struct sockaddr_in6 *)&ss)->sin6_port;

                break;

        default:

                __set_errno (EAFNOSUPPORT);

                return -1;

        }

        s = __socket(family, SOCK_STREAM, 0);

        if (s < 0)

                return -1;

        memset (&ss, '\0', sizeof(ss));

#ifdef SALEN

        ss.__ss_len = len;

#endif

        ss.ss_family = family;

        /* Ignore invalid values.  */

        if (*alport < IPPORT_RESERVED / 2)

                *alport = IPPORT_RESERVED / 2;

        else if (*alport >= IPPORT_RESERVED)

                *alport = IPPORT_RESERVED - 1;

        int start = *alport;

        do {

                *sport = htons((uint16_t) *alport);

                if (__bind(s, (struct sockaddr *)&ss, len) >= 0)

                        return s;

                if (errno != EADDRINUSE) {

                        (void)__close(s);

                        return -1;

                }

                if ((*alport)-- == IPPORT_RESERVED/2)

                        *alport = IPPORT_RESERVED - 1;

        } while (*alport != start);

        (void)__close(s);

        __set_errno (EAGAIN);

        return -1;

}

libc_hidden_def (rresvport_af)

int

rresvport(alport)

        int *alport;

{

        return rresvport_af(alport, AF_INET);

}

int     __check_rhosts_file = 1;

char    *__rcmd_errstr;

int

ruserok_af(rhost, superuser, ruser, luser, af)

        const char *rhost, *ruser, *luser;

        int superuser;

        sa_family_t af;

{

        struct addrinfo hints, *res, *res0;

        int gai;

        int ret;

        memset (&hints, '\0', sizeof(hints));

        hints.ai_family = af;

        gai = getaddrinfo(rhost, NULL, &hints, &res0);

        if (gai)

                return -1;

        ret = -1;

        for (res=res0; res; res=res->ai_next)

                if (ruserok2_sa(res->ai_addr, res->ai_addrlen,

                                superuser, ruser, luser, rhost) == 0){

                        ret = 0;

                        break;

                }

        freeaddrinfo(res0);

        return (ret);

}

libc_hidden_def (ruserok_af)

int

ruserok(rhost, superuser, ruser, luser)

        const char *rhost, *ruser, *luser;

        int superuser;

{

        return ruserok_af(rhost, superuser, ruser, luser, AF_INET);

}

/* Extremely paranoid file open function. */

static FILE *

iruserfopen (const char *file, uid_t okuser)

{

  struct stat64 st;

  char *cp = NULL;

  FILE *res = NULL;

  /* If not a regular file, if owned by someone other than user or

     root, if writeable by anyone but the owner, or if hardlinked

     anywhere, quit.  */

  cp = NULL;

  if (__lxstat64 (_STAT_VER, file, &st))

    cp = _("lstat failed");

  else if (!S_ISREG (st.st_mode))

    cp = _("not regular file");

  else

    {

      res = fopen (file, "rc");

      if (!res)

        cp = _("cannot open");

      else if (__fxstat64 (_STAT_VER, fileno (res), &st) < 0)

        cp = _("fstat failed");

      else if (st.st_uid && st.st_uid != okuser)

        cp = _("bad owner");

      else if (st.st_mode & (S_IWGRP|S_IWOTH))

        cp = _("writeable by other than owner");

      else if (st.st_nlink > 1)

        cp = _("hard linked somewhere");

    }

  /* If there were any problems, quit.  */

  if (cp != NULL)

    {

      __rcmd_errstr = cp;

      if (res)

        fclose (res);

      return NULL;

    }

  /* No threads use this stream.  */

  __fsetlocking (res, FSETLOCKING_BYCALLER);

  return res;

}

/*

 * New .rhosts strategy: We are passed an ip address. We spin through

 * hosts.equiv and .rhosts looking for a match. When the .rhosts only

 * has ip addresses, we don't have to trust a nameserver.  When it

 * contains hostnames, we spin through the list of addresses the nameserver

 * gives us and look for a match.

 *

 * Returns 0 if ok, -1 if not ok.

 */

static int

ruserok2_sa (ra, ralen, superuser, ruser, luser, rhost)

     struct sockaddr *ra;

     size_t ralen;

     int superuser;

     const char *ruser, *luser, *rhost;

{

  FILE *hostf = NULL;

  int isbad = -1;

  if (!superuser)

    hostf = iruserfopen (_PATH_HEQUIV, 0);

  if (hostf)

    {

      isbad = __validuser2_sa (hostf, ra, ralen, luser, ruser, rhost);

      fclose (hostf);

      if (!isbad)

        return 0;

    }

  if (__check_rhosts_file || superuser)

    {

      char *pbuf;

      struct passwd pwdbuf, *pwd;

      size_t dirlen;

      size_t buflen = __sysconf (_SC_GETPW_R_SIZE_MAX);

      char *buffer = __alloca (buflen);

      uid_t uid;

      if (__getpwnam_r (luser, &pwdbuf, buffer, buflen, &pwd) != 0

          || pwd == NULL)

        return -1;

      dirlen = strlen (pwd->pw_dir);

      pbuf = alloca (dirlen + sizeof "/.rhosts");

      __mempcpy (__mempcpy (pbuf, pwd->pw_dir, dirlen),

                 "/.rhosts", sizeof "/.rhosts");

       /* Change effective uid while reading .rhosts.  If root and

          reading an NFS mounted file system, can't read files that

          are protected read/write owner only.  */

       uid = __geteuid ();

       seteuid (pwd->pw_uid);

       hostf = iruserfopen (pbuf, pwd->pw_uid);

       if (hostf != NULL)

         {

           isbad = __validuser2_sa (hostf, ra, ralen, luser, ruser, rhost);

           fclose (hostf);

         }

       seteuid (uid);

       return isbad;