diff options
Diffstat (limited to 'newlib/libc/sys/linux/net/rcmd.c')
-rw-r--r-- | newlib/libc/sys/linux/net/rcmd.c | 1190 |
1 files changed, 542 insertions, 648 deletions
diff --git a/newlib/libc/sys/linux/net/rcmd.c b/newlib/libc/sys/linux/net/rcmd.c index ab3ade89b..708b69d1b 100644 --- a/newlib/libc/sys/linux/net/rcmd.c +++ b/newlib/libc/sys/linux/net/rcmd.c @@ -1,32 +1,4 @@ /* - * 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. * @@ -38,6 +10,10 @@ * 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. * 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. @@ -58,51 +34,55 @@ #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/cdefs.h> +#include <sys/types.h> +#include <time.h> +#include <sys/select.h> +#include "namespace.h" #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 <stdlib.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> +#ifdef YP +#include <rpc/rpc.h> +#include <rpcsvc/yp_prot.h> +#include <rpcsvc/ypclnt.h> +#endif +#include <arpa/nameser.h> +#include "un-namespace.h" -#include "local.h" +/* wrapper for KAME-special getnameinfo() */ +#ifndef NI_WITHSCOPEID +#define NI_WITHSCOPEID 0 +#endif +extern int innetgr( const char *, const char *, const char *, const char * ); +extern int rcmdsh(char **ahost, int rport, const char *locuser, const char *remuser, const char *cmd, const char *rshprog); +int rresvport_af(int *alport, int family); -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); +#define max(a, b) ((a > b) ? a : b) -libc_hidden_proto (iruserok_af) +int __ivaliduser(FILE *, u_int32_t, const char *, const char *); +int __ivaliduser_af(FILE *,const void *, const char *, const char *, int, int); +int __ivaliduser_sa(FILE *, const struct sockaddr *, socklen_t, const char *, + const char *); +static int __icheckhost(const struct sockaddr *, socklen_t, const char *); -libc_freeres_ptr(static char *ahostbuf); +char paddr[NI_MAXHOST]; int rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, af) @@ -110,300 +90,242 @@ rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, af) u_short rport; const char *locuser, *remuser, *cmd; int *fd2p; - sa_family_t af; + int af; { - char paddr[INET6_ADDRSTRLEN]; struct addrinfo hints, *res, *ai; struct sockaddr_storage from; - struct pollfd pfd[2]; - int32_t oldmask; + fd_set reads; + sigset_t oldmask, newmask; pid_t pid; - int s, lport, timo, error; - char c; - int refused; + int s, aport, lport, timo, error; + char c, *p; + int refused, nres; char num[8]; - ssize_t n; + static char canonnamebuf[MAXDNAME]; /* is it proper here? */ - if (af != AF_INET && af != AF_INET6 && af != AF_UNSPEC) - { - __set_errno (EAFNOSUPPORT); - return -1; - } + /* call rcmdsh() with specified remote shell if appropriate. */ + if (!issetugid() && (p = getenv("RSH"))) { + struct servent *sp = getservbyname("shell", "tcp"); - pid = __getpid(); + if (sp && sp->s_port == rport) + return (rcmdsh(ahost, rport, locuser, remuser, + cmd, p)); + } + + /* use rsh(1) if non-root and remote port is shell. */ + if (geteuid()) { + struct servent *sp = getservbyname("shell", "tcp"); + + if (sp && sp->s_port == rport) + return (rcmdsh(ahost, rport, locuser, remuser, + cmd, NULL)); + } - memset(&hints, '\0', sizeof(hints)); + pid = getpid(); + + memset(&hints, 0, sizeof(hints)); hints.ai_flags = AI_CANONNAME; hints.ai_family = af; hints.ai_socktype = SOCK_STREAM; + hints.ai_protocol = 0; (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); + fprintf(stderr, "rcmd: getaddrinfo: %s\n", + gai_strerror(error)); + if (error == EAI_SYSTEM) + fprintf(stderr, "rcmd: getaddrinfo: %s\n", + strerror(errno)); + 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; + if (res->ai_canonname + && strlen(res->ai_canonname) + 1 < sizeof(canonnamebuf)) { + strncpy(canonnamebuf, res->ai_canonname, sizeof(canonnamebuf)); + *ahost = canonnamebuf; + } + nres = 0; + for (ai = res; ai; ai = ai->ai_next) + nres++; ai = res; refused = 0; - oldmask = __sigblock(sigmask(SIGURG)); + sigemptyset(&newmask); + sigaddset(&newmask, SIGURG); + sigprocmask(SIG_BLOCK, (const sigset_t *)&newmask, &oldmask); 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"); + if (errno != EAGAIN && ai->ai_next) { + ai = ai->ai_next; + continue; } - __sigsetmask(oldmask); + if (errno == EAGAIN) + (void)fprintf(stderr, + "rcmd: socket: All ports in use\n"); + else + (void)fprintf(stderr, "rcmd: socket: %s\n", + strerror(errno)); freeaddrinfo(res); - return -1; + sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, + NULL); + return (-1); } - __fcntl(s, F_SETOWN, pid); - if (__connect(s, ai->ai_addr, ai->ai_addrlen) >= 0) + fcntl(s, F_SETOWN, pid); + if (connect(s, ai->ai_addr, ai->ai_addrlen) >= 0) break; - (void)__close(s); + (void)close(s); if (errno == EADDRINUSE) { lport--; continue; } if (errno == ECONNREFUSED) refused = 1; - if (ai->ai_next != NULL) { + if (ai->ai_next == NULL && (!refused || timo > 16)) { + (void)fprintf(stderr, "%s: %s\n", + *ahost, strerror(errno)); + freeaddrinfo(res); + sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, + NULL); + return (-1); + } + if (nres > 1) { 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); + NI_NUMERICHOST|NI_WITHSCOPEID); + (void)fprintf(stderr, "connect to address %s: ", + paddr); + 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); + if ((ai = ai->ai_next) == NULL) { + /* refused && timo <= 16 */ + struct timespec time_to_sleep, time_remaining; + + time_to_sleep.tv_sec = timo; + time_to_sleep.tv_nsec = 0; + (void)nanosleep(&time_to_sleep, &time_remaining); 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; + if (nres > 1) { + getnameinfo(ai->ai_addr, ai->ai_addrlen, + paddr, sizeof(paddr), + NULL, 0, + NI_NUMERICHOST|NI_WITHSCOPEID); + fprintf(stderr, "Trying %s...\n", paddr); + } } lport--; if (fd2p == 0) { - __write(s, "", 1); + write(s, "", 1); lport = 0; } else { char num[8]; int s2 = rresvport_af(&lport, ai->ai_family), s3; - socklen_t len = ai->ai_addrlen; + int len = ai->ai_addrlen; + int nfds; 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); + if (write(s, num, strlen(num)+1) != strlen(num)+1) { + (void)fprintf(stderr, + "rcmd: write (setting up stderr): %s\n", + strerror(errno)); + (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); + nfds = max(s, s2)+1; + if(nfds > FD_SETSIZE) { + fprintf(stderr, "rcmd: too many files\n"); + (void)close(s2); goto bad; } - s3 = TEMP_FAILURE_RETRY (accept(s2, (struct sockaddr *)&from, - &len)); +again: + FD_ZERO(&reads); + FD_SET(s, &reads); + FD_SET(s2, &reads); + errno = 0; + if (select(nfds, &reads, 0, 0, 0) < 1 || !FD_ISSET(s2, &reads)){ + if (errno != 0) + (void)fprintf(stderr, + "rcmd: select (setting up stderr): %s\n", + strerror(errno)); + else + (void)fprintf(stderr, + "select: protocol failure in circuit setup\n"); + (void)close(s2); + goto bad; + } + s3 = accept(s2, (struct sockaddr *)&from, &len); switch (from.ss_family) { case AF_INET: - rport = ntohs(((struct sockaddr_in *)&from)->sin_port); + aport = ntohs(((struct sockaddr_in *)&from)->sin_port); break; +#ifdef INET6 case AF_INET6: - rport = ntohs(((struct sockaddr_in6 *)&from)->sin6_port); + aport = ntohs(((struct sockaddr_in6 *)&from)->sin6_port); break; +#endif default: - rport = 0; + aport = 0; /* error */ break; } - (void)__close(s2); + /* + * XXX careful for ftp bounce attacks. If discovered, shut them + * down and check for the real auxiliary channel to connect. + */ + if (aport == 20) { + close(s3); + goto again; + } + (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"); + (void)fprintf(stderr, + "rcmd: accept: %s\n", strerror(errno)); 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); - } + if (aport >= IPPORT_RESERVED || aport < IPPORT_RESERVED / 2) { + (void)fprintf(stderr, + "socket: protocol failure in circuit setup.\n"); 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); - } + (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) { + (void)fprintf(stderr, + "rcmd: %s: %s\n", *ahost, strerror(errno)); goto bad2; } if (c != 0) { - while (__read(s, &c, 1) == 1) { - (void)__write(STDERR_FILENO, &c, 1); + while (read(s, &c, 1) == 1) { + (void)write(STDERR_FILENO, &c, 1); if (c == '\n') break; } goto bad2; } - __sigsetmask(oldmask); + sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL); freeaddrinfo(res); - return s; + return (s); bad2: if (lport) - (void)__close(*fd2p); + (void)close(*fd2p); bad: - (void)__close(s); - __sigsetmask(oldmask); + (void)close(s); + sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL); freeaddrinfo(res); - return -1; + return (-1); } -libc_hidden_def (rcmd_af) int rcmd(ahost, rport, locuser, remuser, cmd, fd2p) @@ -412,155 +334,90 @@ rcmd(ahost, rport, locuser, remuser, cmd, fd2p) const char *locuser, *remuser, *cmd; int *fd2p; { - return rcmd_af (ahost, rport, locuser, remuser, cmd, fd2p, AF_INET); + return rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, AF_INET); +} + +int +rresvport(port) + int *port; +{ + return rresvport_af(port, AF_INET); } int rresvport_af(alport, family) - int *alport; - sa_family_t family; + int *alport, family; { - struct sockaddr_storage ss; int s; - size_t len; - uint16_t *sport; + struct sockaddr_storage ss; + u_short *sport; - switch(family){ + memset(&ss, 0, sizeof(ss)); + ss.ss_family = family; + switch (family) { case AF_INET: - len = sizeof(struct sockaddr_in); sport = &((struct sockaddr_in *)&ss)->sin_port; + ((struct sockaddr_in *)&ss)->sin_addr.s_addr = INADDR_ANY; break; +#ifdef INET6 case AF_INET6: - len = sizeof(struct sockaddr_in6); sport = &((struct sockaddr_in6 *)&ss)->sin6_port; + ((struct sockaddr_in6 *)&ss)->sin6_addr = in6addr_any; break; +#endif default: - __set_errno (EAFNOSUPPORT); + 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; + s = socket(ss.ss_family, SOCK_STREAM, 0); + if (s < 0) + return (-1); +#if 0 /* compat_exact_traditional_rresvport_semantics */ + 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); + } #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); + *sport = 0; + if (bindresvport_sa(s, (struct sockaddr *)&ss) == -1) { + (void)close(s); + return (-1); + } + *alport = (int)ntohs(*sport); + return (s); } 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; + struct addrinfo hints, *res, *r; + int error; + + memset(&hints, 0, sizeof(hints)); + hints.ai_family = PF_UNSPEC; + hints.ai_socktype = SOCK_DGRAM; /*dummy*/ + error = getaddrinfo(rhost, "0", &hints, &res); + if (error) + return (-1); + + for (r = res; r; r = r->ai_next) { + if (iruserok_sa(r->ai_addr, r->ai_addrlen, superuser, ruser, + luser) == 0) { + freeaddrinfo(res); + return (0); + } + } + freeaddrinfo(res); + return (-1); } /* @@ -572,127 +429,110 @@ iruserfopen (const char *file, uid_t okuser) * * 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; +int +iruserok(raddr, superuser, ruser, luser) + unsigned long raddr; + int superuser; + const char *ruser, *luser; { - 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; - } - return -1; + struct sockaddr_in sin; + int sin_len; + + memset(&sin, 0, sizeof(sin)); + sin.sin_family = AF_INET; + sin_len = sizeof(struct sockaddr_in); + memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr)); + return iruserok_sa((struct sockaddr *)&sin, sin_len, superuser, + ruser, luser); } + /* - * ruserok_sa() is now discussed on ipng, so - * currently disabled for external use + * AF independent extension of iruserok. + * + * Returns 0 if ok, -1 if not ok. */ -static int ruserok_sa(ra, ralen, superuser, ruser, luser) - struct sockaddr *ra; - size_t ralen; - int superuser; - const char *ruser, *luser; -{ - return ruserok2_sa(ra, ralen, superuser, ruser, luser, "-"); -} - -/* This is the exported version. */ int -iruserok_af (raddr, superuser, ruser, luser, af) - const void *raddr; - int superuser; - const char *ruser, *luser; - sa_family_t af; +iruserok_sa(ra, rlen, superuser, ruser, luser) + const void *ra; + int rlen; + int superuser; + const char *ruser, *luser; { - struct sockaddr_storage ra; - size_t ralen; - - memset (&ra, '\0', sizeof(ra)); - switch (af){ - case AF_INET: - ((struct sockaddr_in *)&ra)->sin_family = AF_INET; - memcpy (&(((struct sockaddr_in *)&ra)->sin_addr), raddr, - sizeof(struct in_addr)); - ralen = sizeof(struct sockaddr_in); - break; - case AF_INET6: - ((struct sockaddr_in6 *)&ra)->sin6_family = AF_INET6; - memcpy (&(((struct sockaddr_in6 *)&ra)->sin6_addr), raddr, - sizeof(struct in6_addr)); - ralen = sizeof(struct sockaddr_in6); - break; - default: - return 0; - } - return ruserok_sa ((struct sockaddr *)&ra, ralen, superuser, ruser, luser); -} -libc_hidden_def (iruserok_af) + char *cp; + struct stat sbuf; + struct passwd *pwd; + FILE *hostf; + uid_t uid; + int first; + char pbuf[MAXPATHLEN]; + const struct sockaddr *raddr; + struct sockaddr_storage ss; -int -iruserok (raddr, superuser, ruser, luser) - u_int32_t raddr; - int superuser; - const char *ruser, *luser; -{ - return iruserok_af (&raddr, superuser, ruser, luser, AF_INET); + /* avoid alignment issue */ + if (rlen > sizeof(ss)) + return(-1); + memcpy(&ss, ra, rlen); + raddr = (struct sockaddr *)&ss; + + first = 1; + hostf = superuser ? NULL : fopen(_PATH_HEQUIV, "r"); +again: + if (hostf) { + if (__ivaliduser_sa(hostf, raddr, rlen, luser, ruser) == 0) { + (void)fclose(hostf); + return (0); + } + (void)fclose(hostf); + } + if (first == 1 && (__check_rhosts_file || superuser)) { + first = 0; + if ((pwd = getpwnam(luser)) == NULL) + return (-1); + (void)strcpy(pbuf, pwd->pw_dir); + (void)strcat(pbuf, "/.rhosts"); + + /* + * Change effective uid while opening .rhosts. If root and + * reading an NFS mounted file system, can't read files that + * are protected read/write owner only. + */ + uid = geteuid(); + (void)seteuid(pwd->pw_uid); + hostf = fopen(pbuf, "r"); + (void)seteuid(uid); + + if (hostf == NULL) + return (-1); + /* + * If not a regular file, or is owned by someone other than + * user or root or if writeable by anyone but the owner, quit. + */ + cp = NULL; + if (lstat(pbuf, &sbuf) < 0) + cp = ".rhosts lstat failed"; + else if (!S_ISREG(sbuf.st_mode)) + cp = ".rhosts not regular file"; + else if (fstat(fileno(hostf), &sbuf) < 0) + cp = ".rhosts fstat failed"; + else if (sbuf.st_uid && sbuf.st_uid != pwd->pw_uid) + cp = "bad .rhosts owner"; + else if (sbuf.st_mode & (S_IWGRP|S_IWOTH)) + cp = ".rhosts writeable by other than owner"; + /* If there were any problems, quit. */ + if (cp) { + __rcmd_errstr = cp; + (void)fclose(hostf); + return (-1); + } + goto again; + } + return (-1); } /* * XXX * Don't make static, used by lpd(8). * - * This function is not used anymore. It is only present because lpd(8) - * calls it (!?!). We simply call __invaliduser2() with an illegal rhost - * argument. This means that netgroups won't work in .rhost/hosts.equiv - * files. If you want lpd to work with netgroups, fix lpd to use ruserok() - * or PAM. * Returns 0 if ok, -1 if not ok. */ int @@ -701,185 +541,239 @@ __ivaliduser(hostf, raddr, luser, ruser) u_int32_t raddr; const char *luser, *ruser; { - struct sockaddr_in ra; - memset(&ra, '\0', sizeof(ra)); - ra.sin_family = AF_INET; - ra.sin_addr.s_addr = raddr; - return __validuser2_sa(hostf, (struct sockaddr *)&ra, sizeof(ra), - luser, ruser, "-"); + struct sockaddr_in sin; + int sin_len; + + memset(&sin, 0, sizeof(sin)); + sin.sin_family = AF_INET; + sin_len = sizeof(struct sockaddr_in); + memcpy(&sin.sin_addr, &raddr, sizeof(sin.sin_addr)); + return __ivaliduser_sa(hostf, (struct sockaddr *)&sin, sin_len, + luser, ruser); } - -/* Returns 1 on positive match, 0 on no match, -1 on negative match. */ -static int -internal_function -__checkhost_sa (struct sockaddr *ra, size_t ralen, char *lhost, - const char *rhost) +/* + * Returns 0 if ok, -1 if not ok. + * + * XXX obsolete API. + */ +int +__ivaliduser_af(hostf, raddr, luser, ruser, af, len) + FILE *hostf; + const void *raddr; + const char *luser, *ruser; + int af, len; { - struct addrinfo hints, *res0, *res; - char raddr[INET6_ADDRSTRLEN]; - int match; - int negate=1; /* Multiply return with this to get -1 instead of 1 */ - - /* Check nis netgroup. */ - if (strncmp ("+@", lhost, 2) == 0) - return innetgr (&lhost[2], rhost, NULL, NULL); - - if (strncmp ("-@", lhost, 2) == 0) - return -innetgr (&lhost[2], rhost, NULL, NULL); - - /* -host */ - if (strncmp ("-", lhost,1) == 0) { - negate = -1; - lhost++; - } else if (strcmp ("+",lhost) == 0) { - return 1; /* asking for trouble, but ok.. */ - } + struct sockaddr *sa = NULL; + struct sockaddr_in *sin = NULL; +#ifdef INET6 + struct sockaddr_in6 *sin6 = NULL; +#endif + struct sockaddr_storage ss; - /* Try for raw ip address first. */ - /* XXX */ - if (getnameinfo(ra, ralen, - raddr, sizeof(raddr), NULL, 0, - NI_NUMERICHOST) == 0 - && strcmp(raddr, lhost) == 0) - return negate; - - /* Better be a hostname. */ - match = 0; - memset(&hints, '\0', sizeof(hints)); - hints.ai_family = ra->sa_family; - if (getaddrinfo(lhost, NULL, &hints, &res0) == 0){ - /* Spin through ip addresses. */ - for (res = res0; res; res = res->ai_next) - { - if (res->ai_family == ra->sa_family - && !memcmp(res->ai_addr, ra, res->ai_addrlen)) - { - match = 1; - break; - } - } - freeaddrinfo (res0); + memset(&ss, 0, sizeof(ss)); + switch (af) { + case AF_INET: + if (len != sizeof(sin->sin_addr)) + return -1; + sin = (struct sockaddr_in *)&ss; + sin->sin_family = AF_INET; + memcpy(&sin->sin_addr, raddr, sizeof(sin->sin_addr)); + break; +#ifdef INET6 + case AF_INET6: + if (len != sizeof(sin6->sin6_addr)) + return -1; + /* you will lose scope info */ + sin6 = (struct sockaddr_in6 *)&ss; + sin6->sin6_family = AF_INET6; + memcpy(&sin6->sin6_addr, raddr, sizeof(sin6->sin6_addr)); + break; +#endif + default: + return -1; } - return negate * match; -} - -/* Returns 1 on positive match, 0 on no match, -1 on negative match. */ -static int -internal_function -__icheckuser (const char *luser, const char *ruser) -{ - /* - luser is user entry from .rhosts/hosts.equiv file - ruser is user id on remote host - */ - - /* [-+]@netgroup */ - if (strncmp ("+@", luser, 2) == 0) - return innetgr (&luser[2], NULL, ruser, NULL); - - if (strncmp ("-@", luser,2) == 0) - return -innetgr (&luser[2], NULL, ruser, NULL); - /* -user */ - if (strncmp ("-", luser, 1) == 0) - return -(strcmp (&luser[1], ruser) == 0); - - /* + */ - if (strcmp ("+", luser) == 0) - return 1; - - /* simple string match */ - return strcmp (ruser, luser) == 0; + sa = (struct sockaddr *)&ss; + return __ivaliduser_sa(hostf, sa, 0, luser, ruser); } -/* - * Returns 1 for blank lines (or only comment lines) and 0 otherwise - */ -static int -__isempty (char *p) +int +__ivaliduser_sa(hostf, raddr, salen, luser, ruser) + FILE *hostf; + const struct sockaddr *raddr; + socklen_t salen; + const char *luser, *ruser; { - while (*p && isspace (*p)) { - ++p; - } - - return (*p == '\0' || *p == '#') ? 1 : 0 ; + char *user, *p; + int ch; + char buf[MAXHOSTNAMELEN + 128]; /* host + login */ + char hname[MAXHOSTNAMELEN]; + /* Presumed guilty until proven innocent. */ + int userok = 0, hostok = 0; +#ifdef YP + char *ypdomain; + + if (yp_get_default_domain(&ypdomain)) + ypdomain = NULL; +#else +#define ypdomain NULL +#endif + /* We need to get the damn hostname back for netgroup matching. */ + if (getnameinfo(raddr, salen, hname, sizeof(hname), NULL, 0, + NI_NAMEREQD) != 0) + return (-1); + + while (fgets(buf, sizeof(buf), hostf)) { + p = buf; + /* Skip lines that are too long. */ + if (strchr(p, '\n') == NULL) { + while ((ch = getc(hostf)) != '\n' && ch != EOF); + continue; + } + if (*p == '\n' || *p == '#') { + /* comment... */ + continue; + } + while (*p != '\n' && *p != ' ' && *p != '\t' && *p != '\0') { + *p = isupper((unsigned char)*p) ? tolower((unsigned char)*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'; + /* + * Do +/- and +@/-@ checking. This looks really nasty, + * but it matches SunOS's behavior so far as I can tell. + */ + switch(buf[0]) { + case '+': + if (!buf[1]) { /* '+' matches all hosts */ + hostok = 1; + break; + } + if (buf[1] == '@') /* match a host by netgroup */ + hostok = innetgr((char *)&buf[2], + (char *)&hname, NULL, ypdomain); + else /* match a host by addr */ + hostok = __icheckhost(raddr, salen, + (char *)&buf[1]); + break; + case '-': /* reject '-' hosts and all their users */ + if (buf[1] == '@') { + if (innetgr((char *)&buf[2], + (char *)&hname, NULL, ypdomain)) + return(-1); + } else { + if (__icheckhost(raddr, salen, + (char *)&buf[1])) + return(-1); + } + break; + default: /* if no '+' or '-', do a simple match */ + hostok = __icheckhost(raddr, salen, buf); + break; + } + switch(*user) { + case '+': + if (!*(user+1)) { /* '+' matches all users */ + userok = 1; + break; + } + if (*(user+1) == '@') /* match a user by netgroup */ + userok = innetgr(user+2, NULL, ruser, ypdomain); + else /* match a user by direct specification */ + userok = !(strcmp(ruser, user+1)); + break; + case '-': /* if we matched a hostname, */ + if (hostok) { /* check for user field rejections */ + if (!*(user+1)) + return(-1); + if (*(user+1) == '@') { + if (innetgr(user+2, NULL, + ruser, ypdomain)) + return(-1); + } else { + if (!strcmp(ruser, user+1)) + return(-1); + } + } + break; + default: /* no rejections: try to match the user */ + if (hostok) + userok = !(strcmp(ruser,*user ? user : luser)); + break; + } + if (hostok && userok) + return(0); + } + return (-1); } /* - * Returns 0 if positive match, -1 if _not_ ok. + * Returns "true" if match, 0 if no match. + * + * NI_WITHSCOPEID is useful for comparing sin6_scope_id portion + * if af == AF_INET6. */ static int -__validuser2_sa(hostf, ra, ralen, luser, ruser, rhost) - FILE *hostf; - struct sockaddr *ra; - size_t ralen; - const char *luser, *ruser, *rhost; +__icheckhost(raddr, salen, lhost) + const struct sockaddr *raddr; + socklen_t salen; + const char *lhost; { - register const char *user; - register char *p; - int hcheck, ucheck; - char *buf = NULL; - size_t bufsize = 0; - int retval = -1; - - while (__getline (&buf, &bufsize, hostf) > 0) { - buf[bufsize - 1] = '\0'; /* Make sure it's terminated. */ - p = buf; - - /* Skip empty or comment lines */ - if (__isempty (p)) { - continue; - } - - for (;*p && !isspace(*p); ++p) { - *p = _tolower (*p); + struct sockaddr_in sin; + struct sockaddr_in6 *sin6; + struct addrinfo hints, *res, *r; + int error; + char h1[NI_MAXHOST], h2[NI_MAXHOST]; + + if (raddr->sa_family == AF_INET6) { + sin6 = (struct sockaddr_in6 *)raddr; + if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { + memset(&sin, 0, sizeof(sin)); + sin.sin_family = AF_INET; + memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[12], + sizeof(sin.sin_addr)); + raddr = (struct sockaddr *)&sin; + salen = sizeof(struct sockaddr_in); + } } - /* Next we want to find the permitted name for the remote user. */ - if (*p == ' ' || *p == '\t') { - /* <nul> terminate hostname and skip spaces */ - for (*p++='\0'; *p && isspace (*p); ++p); - - user = p; /* this is the user's name */ - while (*p && !isspace (*p)) - ++p; /* find end of user's name */ - } else - user = p; - - *p = '\0'; /* <nul> terminate username (+host?) */ - - /* buf -> host(?) ; user -> username(?) */ - - /* First check host part */ - hcheck = __checkhost_sa (ra, ralen, buf, rhost); - - if (hcheck < 0) - break; - - if (hcheck) { - /* Then check user part */ - if (! (*user)) - user = luser; - - ucheck = __icheckuser (user, ruser); - - /* Positive 'host user' match? */ - if (ucheck > 0) { - retval = 0; - break; - } - - /* Negative 'host -user' match? */ - if (ucheck < 0) - break; - - /* Neither, go on looking for match */ + h1[0] = '\0'; + if (getnameinfo(raddr, salen, h1, sizeof(h1), NULL, 0, + NI_NUMERICHOST | NI_WITHSCOPEID) != 0) + return (0); + + /* Resolve laddr into sockaddr */ + memset(&hints, 0, sizeof(hints)); + hints.ai_family = raddr->sa_family; + hints.ai_socktype = SOCK_DGRAM; /*XXX dummy*/ + res = NULL; + error = getaddrinfo(lhost, "0", &hints, &res); + if (error) + return (0); + + for (r = res; r ; r = r->ai_next) { + h2[0] = '\0'; + if (getnameinfo(r->ai_addr, r->ai_addrlen, h2, sizeof(h2), + NULL, 0, NI_NUMERICHOST | NI_WITHSCOPEID) != 0) + continue; + if (strcmp(h1, h2) == 0) { + freeaddrinfo(res); + return (1); + } } - } - - if (buf != NULL) - free (buf); - return retval; + /* No match. */ + freeaddrinfo(res); + return (0); } |