Aren/NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
adf9419c9a
NetBSD/libexec/rshd/rshd.c
christos cce62d0952 check pwd != NULL
2005-04-19 03:22:54 +00:00

798 lines
21 KiB
C
Raw Blame History

/* $NetBSD: rshd.c,v 1.43 2005/04/19 03:24:24 christos Exp $ */
/*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by WIDE Project and
* its contributors.
* 4. 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) 1988, 1989, 1992, 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. 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.
*/
#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1988, 1989, 1992, 1993, 1994\n\
The Regents of the University of California. All rights reserved.\n");
#if 0
static char sccsid[] = "@(#)rshd.c 8.2 (Berkeley) 4/6/94";
#else
__RCSID("$NetBSD: rshd.c,v 1.43 2005/04/19 03:24:24 christos Exp $");
#endif
#endif /* not lint */
/*
* remote shell server:
* [port]\0
* remuser\0
* locuser\0
* command\0
* data
*/
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <errno.h>
#include <fcntl.h>
#include <paths.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include <poll.h>
#ifdef LOGIN_CAP
#include <login_cap.h>
#endif
#ifdef USE_PAM
#include <security/pam_appl.h>
#include <security/openpam.h>
#include <sys/wait.h>
static struct pam_conv pamc = { openpam_nullconv, NULL };
static pam_handle_t *pamh;
static int pam_err;
#define PAM_END do { \
if ((pam_err = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) \
syslog(LOG_ERR|LOG_AUTH, "pam_setcred(): %s", \
pam_strerror(pamh, pam_err)); \
if ((pam_err = pam_close_session(pamh,0)) != PAM_SUCCESS) \
syslog(LOG_ERR|LOG_AUTH, "pam_close_session(): %s", \
pam_strerror(pamh, pam_err)); \
if ((pam_err = pam_end(pamh, pam_err)) != PAM_SUCCESS) \
syslog(LOG_ERR|LOG_AUTH, "pam_end(): %s", \
pam_strerror(pamh, pam_err)); \
} while (/*CONSTCOND*/0)
#else
#define PAM_END
#endif
int keepalive = 1;
int check_all;
int log_success; /* If TRUE, log all successful accesses */
int sent_null;
void doit(struct sockaddr *) __attribute__((__noreturn__));
void rshd_errx(int, const char *, ...)
__attribute__((__noreturn__, __format__(__printf__, 2, 3)));
void getstr(char *, int, const char *);
int local_domain(char *);
char *topdomain(char *);
void usage(void);
int main(int, char *[]);
#define OPTIONS "aLln"
extern int __check_rhosts_file;
extern char *__rcmd_errstr; /* syslog hook from libc/net/rcmd.c. */
static const char incorrect[] = "Login incorrect.";
int
main(int argc, char *argv[])
{
struct linger linger;
int ch, on = 1, fromlen;
struct sockaddr_storage from;
struct protoent *proto;
openlog("rshd", LOG_PID, LOG_DAEMON);
opterr = 0;
while ((ch = getopt(argc, argv, OPTIONS)) != -1)
switch (ch) {
case 'a':
check_all = 1;
break;
case 'l':
__check_rhosts_file = 0;
break;
case 'n':
keepalive = 0;
break;
case 'L':
log_success = 1;
break;
case '?':
default:
usage();
break;
}
argc -= optind;
argv += optind;
fromlen = sizeof(from); /* xxx */
if (getpeername(STDIN_FILENO, (struct sockaddr *)&from, &fromlen) < 0) {
syslog(LOG_ERR, "getpeername: %m");
return EXIT_FAILURE;
}
#if 0
if (((struct sockaddr *)&from)->sa_family == AF_INET6 &&
IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)&from)->sin6_addr) &&
sizeof(struct sockaddr_in) <= sizeof(from)) {
struct sockaddr_in sin;
struct sockaddr_in6 *sin6;
const int off = sizeof(struct sockaddr_in6) -
sizeof(struct sockaddr_in);
sin6 = (struct sockaddr_in6 *)&from;
(void)memset(&sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_len = sizeof(struct sockaddr_in);
(void)memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[off],
sizeof(sin.sin_addr));
(void)memcpy(&from, &sin, sizeof(sin));
fromlen = sin.sin_len;
}
#else
if (((struct sockaddr *)&from)->sa_family == AF_INET6 &&
IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)&from)->sin6_addr)) {
char hbuf[NI_MAXHOST];
if (getnameinfo((struct sockaddr *)&from, fromlen, hbuf,
sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) {
strlcpy(hbuf, "invalid", sizeof(hbuf));
}
syslog(LOG_ERR, "malformed \"from\" address (v4 mapped, %s)",
hbuf);
return EXIT_FAILURE;
}
#endif
if (keepalive &&
setsockopt(STDIN_FILENO, SOL_SOCKET, SO_KEEPALIVE, (char *)&on,
sizeof(on)) < 0)
syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m");
linger.l_onoff = 1;
linger.l_linger = 60; /* XXX */
if (setsockopt(STDIN_FILENO, SOL_SOCKET, SO_LINGER, (char *)&linger,
sizeof (linger)) < 0)
syslog(LOG_WARNING, "setsockopt (SO_LINGER): %m");
proto = getprotobyname("tcp");
(void)setsockopt(STDIN_FILENO, proto->p_proto, TCP_NODELAY, &on,
sizeof(on));
doit((struct sockaddr *)&from);
}
char username[20] = "USER=";
char homedir[64] = "HOME=";
char shell[64] = "SHELL=";
char path[100] = "PATH=";
char *envinit[] =
{homedir, shell, path, username, 0};
char **environ;
void
doit(struct sockaddr *fromp)
{
struct passwd *pwd, pwres;
in_port_t port;
struct pollfd set[2];
int cc, pv[2], pid, s = -1; /* XXX gcc */
int one = 1;
char *hostname, *errorhost = NULL; /* XXX gcc */
const char *cp;
char sig, buf[BUFSIZ];
char cmdbuf[NCARGS+1], locuser[16], remuser[16];
char remotehost[2 * MAXHOSTNAMELEN + 1];
char hostnamebuf[2 * MAXHOSTNAMELEN + 1];
#ifdef LOGIN_CAP
login_cap_t *lc;
#endif
char naddr[NI_MAXHOST];
char saddr[NI_MAXHOST];
char raddr[NI_MAXHOST];
char pbuf[NI_MAXSERV];
int af = fromp->sa_family;
u_int16_t *portp;
struct addrinfo hints, *res, *res0;
int gaierror;
const int niflags = NI_NUMERICHOST | NI_NUMERICSERV;
const char *errormsg = NULL, *errorstr = NULL;
char pwbuf[1024];
(void)signal(SIGINT, SIG_DFL);
(void)signal(SIGQUIT, SIG_DFL);
(void)signal(SIGTERM, SIG_DFL);
#ifdef DEBUG
{
int t = open(_PATH_TTY, O_RDWR);
if (t >= 0) {
ioctl(t, TIOCNOTTY, NULL);
(void)close(t);
}
}
#endif
switch (af) {
case AF_INET:
portp = &((struct sockaddr_in *)fromp)->sin_port;
break;
#ifdef INET6
case AF_INET6:
portp = &((struct sockaddr_in6 *)fromp)->sin6_port;
break;
#endif
default:
syslog(LOG_ERR, "malformed \"from\" address (af %d)", af);
exit(EXIT_FAILURE);
}
if (getnameinfo(fromp, fromp->sa_len, naddr, sizeof(naddr),
pbuf, sizeof(pbuf), niflags) != 0) {
syslog(LOG_ERR, "malformed \"from\" address (af %d)", af);
exit(EXIT_FAILURE);
}
#ifdef IP_OPTIONS
if (af == AF_INET) {
u_char optbuf[BUFSIZ/3];
int optsize = sizeof(optbuf), ipproto, i;
struct protoent *ip;
if ((ip = getprotobyname("ip")) != NULL)
ipproto = ip->p_proto;
else
ipproto = IPPROTO_IP;
if (!getsockopt(0, ipproto, IP_OPTIONS, (char *)optbuf, &optsize) &&
optsize != 0) {
for (i = 0; i < optsize;) {
u_char c = optbuf[i];
if (c == IPOPT_LSRR || c == IPOPT_SSRR) {
syslog(LOG_NOTICE,
"Connection refused from %s "
"with IP option %s",
inet_ntoa((
(struct sockaddr_in *)fromp)->sin_addr),
c == IPOPT_LSRR ? "LSRR" : "SSRR");
exit(EXIT_FAILURE);
}
if (c == IPOPT_EOL)
break;
i += (c == IPOPT_NOP) ? 1 : optbuf[i + 1];
}
}
}
#endif
if (ntohs(*portp) >= IPPORT_RESERVED
|| ntohs(*portp) < IPPORT_RESERVED / 2) {
syslog(LOG_NOTICE|LOG_AUTH,
"Connection from %s on illegal port %u",
naddr, ntohs(*portp));
exit(EXIT_FAILURE);
}
(void) alarm(60);
port = 0;
for (;;) {
char c;
if ((cc = read(STDIN_FILENO, &c, 1)) != 1) {
if (cc < 0)
syslog(LOG_ERR, "read: %m");
(void)shutdown(0, SHUT_RDWR);
exit(EXIT_FAILURE);
}
if (c == 0)
break;
port = port * 10 + c - '0';
}
(void) alarm(0);
if (port != 0) {
int lport = IPPORT_RESERVED - 1;
s = rresvport_af(&lport, af);
if (s < 0) {
syslog(LOG_ERR, "can't get stderr port: %m");
exit(EXIT_FAILURE);
}
if (port >= IPPORT_RESERVED) {
syslog(LOG_ERR, "2nd port not reserved");
exit(EXIT_FAILURE);
}
*portp = htons(port);
if (connect(s, fromp, fromp->sa_len) < 0) {
syslog(LOG_ERR, "connect second port %d: %m", port);
exit(EXIT_FAILURE);
}
}
#ifdef notdef
/* from inetd, socket is already on 0, 1, 2 */
(void)dup2(f, STDIN_FILENO);
(void)dup2(f, STDOUT_FILENO);
(void)dup2(f, STDERR_FILENO);
#endif
if (getnameinfo(fromp, fromp->sa_len, saddr, sizeof(saddr),
NULL, 0, NI_NAMEREQD) == 0) {
/*
* If name returned by getnameinfo is in our domain,
* attempt to verify that we haven't been fooled by someone
* in a remote net; look up the name and check that this
* address corresponds to the name.
*/
hostname = saddr;
res0 = NULL;
if (check_all || local_domain(saddr)) {
(void)strlcpy(remotehost, saddr, sizeof(remotehost));
errorhost = remotehost;
(void)memset(&hints, 0, sizeof(hints));
hints.ai_family = fromp->sa_family;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_CANONNAME;
gaierror = getaddrinfo(remotehost, pbuf, &hints, &res0);
if (gaierror) {
syslog(LOG_NOTICE,
"Couldn't look up address for %s: %s",
remotehost, gai_strerror(gaierror));
errorstr =
"Couldn't look up address for your host (%s)\n";
hostname = naddr;
} else {
for (res = res0; res; res = res->ai_next) {
if (res->ai_family != fromp->sa_family)
continue;
if (res->ai_addrlen != fromp->sa_len)
continue;
if (getnameinfo(res->ai_addr,
res->ai_addrlen,
raddr, sizeof(raddr), NULL, 0,
niflags) == 0
&& strcmp(naddr, raddr) == 0) {
hostname = res->ai_canonname
? res->ai_canonname
: saddr;
break;
}
}
if (res == NULL) {
syslog(LOG_NOTICE,
"Host addr %s not listed for host %s",
naddr, res0->ai_canonname
? res0->ai_canonname
: saddr);
errorstr =
"Host address mismatch for %s\n";
hostname = naddr;
}
}
}
(void)strlcpy(hostnamebuf, hostname, sizeof(hostnamebuf));
hostname = hostnamebuf;
if (res0)
freeaddrinfo(res0);
} else {
(void)strlcpy(hostnamebuf, naddr, sizeof(hostnamebuf));
errorhost = hostname = hostnamebuf;
}
(void)alarm(60);
getstr(remuser, sizeof(remuser), "remuser");
getstr(locuser, sizeof(locuser), "locuser");
getstr(cmdbuf, sizeof(cmdbuf), "command");
(void)alarm(0);
#ifdef USE_PAM
pam_err = pam_start("rsh", locuser, &pamc, &pamh);
if (pam_err != PAM_SUCCESS) {
syslog(LOG_ERR|LOG_AUTH, "pam_start(): %s",
pam_strerror(pamh, pam_err));
rshd_errx(EXIT_FAILURE, incorrect);
}
if ((pam_err = pam_set_item(pamh, PAM_RUSER, remuser)) != PAM_SUCCESS ||
(pam_err = pam_set_item(pamh, PAM_RHOST, hostname) != PAM_SUCCESS)){
syslog(LOG_ERR|LOG_AUTH, "pam_set_item(): %s",
pam_strerror(pamh, pam_err));
rshd_errx(EXIT_FAILURE, incorrect);
}
pam_err = pam_authenticate(pamh, 0);
if (pam_err == PAM_SUCCESS) {
if ((pam_err = pam_get_user(pamh, &cp, NULL)) == PAM_SUCCESS) {
(void)strlcpy(locuser, cp, sizeof(locuser));
/* XXX truncation! */
}
pam_err = pam_acct_mgmt(pamh, 0);
}
if (pam_err != PAM_SUCCESS) {
errorstr = incorrect;
errormsg = pam_strerror(pamh, pam_err);
goto badlogin;
}
#endif /* USE_PAM */
setpwent();
if (getpwnam_r(locuser, &pwres, pwbuf, sizeof(pwbuf), &pwd) != 0 ||
pwd == NULL) {
syslog(LOG_INFO|LOG_AUTH,
"%s@%s as %s: unknown login. cmd='%.80s'",
remuser, hostname, locuser, cmdbuf);
if (errorstr == NULL)
errorstr = "Permission denied.";
rshd_errx(EXIT_FAILURE, errorstr, errorhost);
}
#ifdef LOGIN_CAP
lc = login_getclass(pwd ? pwd->pw_class : NULL);
#endif
if (chdir(pwd->pw_dir) < 0) {
if (chdir("/") < 0
#ifdef LOGIN_CAP
|| login_getcapbool(lc, "requirehome", pwd->pw_uid ? 1 : 0)
#endif
) {
syslog(LOG_INFO|LOG_AUTH,
"%s@%s as %s: no home directory. cmd='%.80s'",
remuser, hostname, locuser, cmdbuf);
rshd_errx(EXIT_SUCCESS, "No remote home directory.");
}
}
#ifndef USE_PAM
if (errorstr ||
(pwd->pw_passwd != 0 && *pwd->pw_passwd != '\0' &&
iruserok_sa(fromp, fromp->sa_len, pwd->pw_uid == 0, remuser,
locuser) < 0)) {
errormsg = __rcmd_errstr ? __rcmd_errstr : "unknown error";
if (errorstr == NULL)
errorstr = "Permission denied.";
goto badlogin;
}
if (pwd->pw_uid && !access(_PATH_NOLOGIN, F_OK))
rshd_errx(EXIT_FAILURE, "Logins currently disabled.");
#endif
#ifdef LOGIN_CAP
/*
* PAM modules might add supplementary groups in
* pam_setcred(), so initialize them first.
* But we need to open the session as root.
*/
if (setusercontext(lc, pwd, pwd->pw_uid, LOGIN_SETGROUP) != 0) {
syslog(LOG_ERR, "setusercontext: %m");
exit(EXIT_FAILURE);
}
#else
initgroups(pwd->pw_name, pwd->pw_gid);
#endif
#ifdef USE_PAM
if ((pam_err = pam_open_session(pamh, 0)) != PAM_SUCCESS) {
syslog(LOG_ERR, "pam_open_session: %s",
pam_strerror(pamh, pam_err));
} else if ((pam_err = pam_setcred(pamh, PAM_ESTABLISH_CRED))
!= PAM_SUCCESS) {
syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, pam_err));
}
#endif
(void)write(STDERR_FILENO, "\0", 1);
sent_null = 1;
if (port) {
if (pipe(pv) < 0)
rshd_errx(EXIT_FAILURE, "Can't make pipe. (%s)",
strerror(errno));
pid = fork();
if (pid == -1)
rshd_errx(EXIT_FAILURE, "Can't fork. (%s)",
strerror(errno));
if (pid) {
(void)close(STDIN_FILENO);
(void)close(STDOUT_FILENO);
(void)close(STDERR_FILENO);
(void)close(pv[1]);
set[0].fd = s;
set[0].events = POLLIN;
set[1].fd = pv[0];
set[1].events = POLLIN;
ioctl(pv[0], FIONBIO, (char *)&one);
/* should set s nbio! */
do {
if (poll(set, 2, INFTIM) < 0)
break;
if (set[0].revents & POLLIN) {
int ret;
ret = read(s, &sig, 1);
if (ret <= 0)
set[0].events = 0;
else
killpg(pid, sig);
}
if (set[1].revents & POLLIN) {
errno = 0;
cc = read(pv[0], buf, sizeof(buf));
if (cc <= 0) {
shutdown(s, SHUT_RDWR);
set[1].events = 0;
} else {
(void)write(s, buf, cc);
}
}
} while ((set[0].revents | set[1].revents) & POLLIN);
PAM_END;
exit(EXIT_SUCCESS);
}
(void)close(s);
(void)close(pv[0]);
(void)dup2(pv[1], STDERR_FILENO);
close(pv[1]);
}
#ifdef USE_PAM
else {
pid = fork();
if (pid == -1)
rshd_errx(EXIT_FAILURE, "Can't fork. (%s)",
strerror(errno));
if (pid) {
pid_t xpid;
int status;
if ((xpid = waitpid(pid, &status, 0)) != pid) {
pam_err = pam_close_session(pamh, 0);
if (pam_err != PAM_SUCCESS) {
syslog(LOG_ERR,
"pam_close_session: %s",
pam_strerror(pamh, pam_err));
}
PAM_END;
if (xpid != -1)
syslog(LOG_WARNING,
"wrong PID: %d != %d", pid, xpid);
else
syslog(LOG_WARNING,
"wait pid=%d failed %m", pid);
exit(EXIT_FAILURE);
}
exit(EXIT_SUCCESS);
}
}
#endif
#ifdef F_CLOSEM
(void)fcntl(STDERR_FILENO + 1, F_CLOSEM, 0);
#else
for (fd = getdtablesize(); fd > STDERR_FILENO; fd--)
(void)close(fd);
#endif
if (setsid() == -1)
syslog(LOG_ERR, "setsid() failed: %m");
#ifdef USE_PAM
if (setlogin(pwd->pw_name) < 0)
syslog(LOG_ERR, "setlogin() failed: %m");
if (*pwd->pw_shell == '\0')
pwd->pw_shell = __UNCONST(_PATH_BSHELL);
(void)pam_setenv(pamh, "HOME", pwd->pw_dir, 1);
(void)pam_setenv(pamh, "SHELL", pwd->pw_shell, 1);
(void)pam_setenv(pamh, "USER", pwd->pw_name, 1);
(void)pam_setenv(pamh, "PATH", _PATH_DEFPATH, 1);
environ = pam_getenvlist(pamh);
(void)pam_end(pamh, pam_err);
#else
#ifdef LOGIN_CAP
{
char *sh;
if ((sh = login_getcapstr(lc, "shell", NULL, NULL))) {
if(!(sh = strdup(sh))) {
syslog(LOG_ERR, "Cannot alloc mem");
exit(EXIT_FAILURE);
}
pwd->pw_shell = sh;
}
}
#endif
environ = envinit;
(void)strlcat(homedir, pwd->pw_dir, sizeof(homedir));
(void)strlcat(path, _PATH_DEFPATH, sizeof(path));
(void)strlcat(shell, pwd->pw_shell, sizeof(shell));
(void)strlcat(username, pwd->pw_name, sizeof(username));
#endif
cp = strrchr(pwd->pw_shell, '/');
if (cp)
cp++;
else
cp = pwd->pw_shell;
#ifdef LOGIN_CAP
if (setusercontext(lc, pwd, pwd->pw_uid,
LOGIN_SETALL & ~LOGIN_SETGROUP) < 0) {
syslog(LOG_ERR, "setusercontext(): %m");
exit(EXIT_FAILURE);
}
login_close(lc);
#else
(void)setgid((gid_t)pwd->pw_gid);
(void)setuid((uid_t)pwd->pw_uid);
#endif
endpwent();
if (log_success || pwd->pw_uid == 0) {
syslog(LOG_INFO|LOG_AUTH, "%s@%s as %s: cmd='%.80s'",
remuser, hostname, locuser, cmdbuf);
}
(void)execl(pwd->pw_shell, cp, "-c", cmdbuf, NULL);
rshd_errx(EXIT_FAILURE, "%s: %s", pwd->pw_shell, strerror(errno));
badlogin:
syslog(LOG_INFO|LOG_AUTH,
"%s@%s as %s: permission denied (%s). cmd='%.80s'",
remuser, hostname, locuser, errormsg, cmdbuf);
rshd_errx(EXIT_FAILURE, errorstr, errorhost);
}
/*
* Report error to client. Note: can't be used until second socket has
* connected to client, or older clients will hang waiting for that
* connection first.
*/
#include <stdarg.h>
void
rshd_errx(int error, const char *fmt, ...)
{
va_list ap;
int len, rv;
char *bp, buf[BUFSIZ];
va_start(ap, fmt);
bp = buf;
if (sent_null == 0) {
*bp++ = 1;
len = 1;
} else
len = 0;
rv = vsnprintf(bp, sizeof(buf) - 2, fmt, ap);
bp[rv++] = '\n';
(void)write(STDERR_FILENO, buf, len + rv);
va_end(ap);
exit(error);
}
void
getstr(char *buf, int cnt, const char *err)
{
char c;
do {
if (read(STDIN_FILENO, &c, 1) != 1)
exit(EXIT_FAILURE);
*buf++ = c;
if (--cnt == 0)
rshd_errx(EXIT_FAILURE, "%s too long", err);
} while (c != 0);
}
/*
* Check whether host h is in our local domain,
* defined as sharing the last two components of the domain part,
* or the entire domain part if the local domain has only one component.
* If either name is unqualified (contains no '.'),
* assume that the host is local, as it will be
* interpreted as such.
*/
int
local_domain(char *h)
{
char localhost[MAXHOSTNAMELEN + 1];
char *p1, *p2;
localhost[0] = 0;
(void)gethostname(localhost, sizeof(localhost));
localhost[sizeof(localhost) - 1] = '\0';
p1 = topdomain(localhost);
p2 = topdomain(h);
if (p1 == NULL || p2 == NULL || !strcasecmp(p1, p2))
return (1);
return (0);
}
char *
topdomain(char *h)
{
char *p, *maybe = NULL;
int dots = 0;
for (p = h + strlen(h); p >= h; p--) {
if (*p == '.') {
if (++dots == 2)
return (p);
maybe = p;
}
}
return (maybe);
}
void
usage(void)
{
syslog(LOG_ERR, "Usage: %s [-%s]", getprogname(), OPTIONS);
exit(EXIT_FAILURE);
}
Reference in New Issue View Git Blame Copy Permalink