diff options
Diffstat (limited to 'newlib/libc/sys/linux/net/rcmd.c')
| -rw-r--r-- | newlib/libc/sys/linux/net/rcmd.c | 779 |
1 files changed, 0 insertions, 779 deletions
diff --git a/newlib/libc/sys/linux/net/rcmd.c b/newlib/libc/sys/linux/net/rcmd.c deleted file mode 100644 index 708b69d1b..000000000 --- a/newlib/libc/sys/linux/net/rcmd.c +++ /dev/null @@ -1,779 +0,0 @@ -/* - * 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. - * 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. - * - * 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/cdefs.h> -#include <sys/types.h> -#include <time.h> -#include <sys/select.h> - -#include "namespace.h" -#include <sys/param.h> -#include <sys/socket.h> -#include <sys/stat.h> - -#include <netinet/in.h> -#include <arpa/inet.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 <ctype.h> -#include <string.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" - -/* 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); - -#define max(a, b) ((a > b) ? a : b) - -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 *); - -char paddr[NI_MAXHOST]; - -int -rcmd_af(ahost, rport, locuser, remuser, cmd, fd2p, af) - char **ahost; - u_short rport; - const char *locuser, *remuser, *cmd; - int *fd2p; - int af; -{ - struct addrinfo hints, *res, *ai; - struct sockaddr_storage from; - fd_set reads; - sigset_t oldmask, newmask; - pid_t pid; - int s, aport, lport, timo, error; - char c, *p; - int refused, nres; - char num[8]; - static char canonnamebuf[MAXDNAME]; /* is it proper here? */ - - /* call rcmdsh() with specified remote shell if appropriate. */ - if (!issetugid() && (p = getenv("RSH"))) { - struct servent *sp = getservbyname("shell", "tcp"); - - 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)); - } - - 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) { - fprintf(stderr, "rcmd: getaddrinfo: %s\n", - gai_strerror(error)); - if (error == EAI_SYSTEM) - fprintf(stderr, "rcmd: getaddrinfo: %s\n", - strerror(errno)); - return (-1); - } - - 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; - sigemptyset(&newmask); - sigaddset(&newmask, SIGURG); - sigprocmask(SIG_BLOCK, (const sigset_t *)&newmask, &oldmask); - for (timo = 1, lport = IPPORT_RESERVED - 1;;) { - s = rresvport_af(&lport, ai->ai_family); - if (s < 0) { - if (errno != EAGAIN && ai->ai_next) { - ai = ai->ai_next; - continue; - } - 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); - 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) - break; - (void)close(s); - if (errno == EADDRINUSE) { - lport--; - continue; - } - if (errno == ECONNREFUSED) - refused = 1; - 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; - - getnameinfo(ai->ai_addr, ai->ai_addrlen, - paddr, sizeof(paddr), - NULL, 0, - NI_NUMERICHOST|NI_WITHSCOPEID); - (void)fprintf(stderr, "connect to address %s: ", - paddr); - errno = oerrno; - perror(0); - } - 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; - } - 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); - lport = 0; - } else { - char num[8]; - int s2 = rresvport_af(&lport, ai->ai_family), s3; - 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) != strlen(num)+1) { - (void)fprintf(stderr, - "rcmd: write (setting up stderr): %s\n", - strerror(errno)); - (void)close(s2); - goto bad; - } - nfds = max(s, s2)+1; - if(nfds > FD_SETSIZE) { - fprintf(stderr, "rcmd: too many files\n"); - (void)close(s2); - goto bad; - } -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: - aport = ntohs(((struct sockaddr_in *)&from)->sin_port); - break; -#ifdef INET6 - case AF_INET6: - aport = ntohs(((struct sockaddr_in6 *)&from)->sin6_port); - break; -#endif - default: - aport = 0; /* error */ - break; - } - /* - * 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) { - (void)fprintf(stderr, - "rcmd: accept: %s\n", strerror(errno)); - lport = 0; - goto bad; - } - *fd2p = s3; - if (aport >= IPPORT_RESERVED || aport < IPPORT_RESERVED / 2) { - (void)fprintf(stderr, - "socket: protocol failure in circuit setup.\n"); - 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) { - (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); - if (c == '\n') - break; - } - goto bad2; - } - sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL); - freeaddrinfo(res); - return (s); -bad2: - if (lport) - (void)close(*fd2p); -bad: - (void)close(s); - sigprocmask(SIG_SETMASK, (const sigset_t *)&oldmask, NULL); - freeaddrinfo(res); - return (-1); -} - -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(port) - int *port; -{ - return rresvport_af(port, AF_INET); -} - -int -rresvport_af(alport, family) - int *alport, family; -{ - int s; - struct sockaddr_storage ss; - u_short *sport; - - memset(&ss, 0, sizeof(ss)); - ss.ss_family = family; - switch (family) { - case AF_INET: - sport = &((struct sockaddr_in *)&ss)->sin_port; - ((struct sockaddr_in *)&ss)->sin_addr.s_addr = INADDR_ANY; - break; -#ifdef INET6 - case AF_INET6: - sport = &((struct sockaddr_in6 *)&ss)->sin6_port; - ((struct sockaddr_in6 *)&ss)->sin6_addr = in6addr_any; - break; -#endif - default: - errno = EAFNOSUPPORT; - return -1; - } - - 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 - *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(rhost, superuser, ruser, luser) - const char *rhost, *ruser, *luser; - int superuser; -{ - 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); -} - -/* - * 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. - */ -int -iruserok(raddr, superuser, ruser, luser) - unsigned long raddr; - int superuser; - const char *ruser, *luser; -{ - 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); -} - -/* - * AF independent extension of iruserok. - * - * Returns 0 if ok, -1 if not ok. - */ -int -iruserok_sa(ra, rlen, superuser, ruser, luser) - const void *ra; - int rlen; - int superuser; - const char *ruser, *luser; -{ - 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; - - /* 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). - * - * Returns 0 if ok, -1 if not ok. - */ -int -__ivaliduser(hostf, raddr, luser, ruser) - FILE *hostf; - u_int32_t raddr; - const char *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 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 sockaddr *sa = NULL; - struct sockaddr_in *sin = NULL; -#ifdef INET6 - struct sockaddr_in6 *sin6 = NULL; -#endif - struct sockaddr_storage ss; - - 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; - } - - sa = (struct sockaddr *)&ss; - return __ivaliduser_sa(hostf, sa, 0, luser, ruser); -} - -int -__ivaliduser_sa(hostf, raddr, salen, luser, ruser) - FILE *hostf; - const struct sockaddr *raddr; - socklen_t salen; - const char *luser, *ruser; -{ - 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 "true" if match, 0 if no match. - * - * NI_WITHSCOPEID is useful for comparing sin6_scope_id portion - * if af == AF_INET6. - */ -static int -__icheckhost(raddr, salen, lhost) - const struct sockaddr *raddr; - socklen_t salen; - const char *lhost; -{ - 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); - } - } - - 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); - } - } - - /* No match. */ - freeaddrinfo(res); - return (0); -} |