OpenSolaris_b135/lib/libnsl/rpc/ti_opts.c
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* Portions of this source code were derived from Berkeley
* 4.3 BSD under license from the Regents of the University of
* California.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include "mt.h"
#include <stdio.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <inttypes.h>
#include <sys/types.h>
#include <tiuser.h>
#include <sys/socket.h>
#include <net/if.h>
#include <sys/sockio.h>
#include <rpc/rpc.h>
#include <sys/tl.h>
#include <sys/stropts.h>
#include <errno.h>
#include <libintl.h>
#include <string.h>
#include <strings.h>
#include <syslog.h>
#include <unistd.h>
#include <ucred.h>
#include <alloca.h>
#include <stdlib.h>
#include <zone.h>
#include <tsol/label.h>
extern bool_t __svc_get_door_ucred(const SVCXPRT *, ucred_t *);
/*
* This routine is typically called on the server side if the server
* wants to know the caller ucred. Called typically by rpcbind. It
* depends upon the t_optmgmt call to local transport driver so that
* return the uid value in options in T_CONN_IND, T_CONN_CON and
* T_UNITDATA_IND.
* With the advent of the credential in the mblk, this is simply
* extended to all transports when the packet travels over the
* loopback network; for UDP we use a special socket option and for
* tcp we don't need to do any setup, we just call getpeerucred()
* later.
*/
/*
* Version for Solaris with new local transport code and ucred.
*/
int
__rpc_negotiate_uid(int fd)
{
struct strioctl strioc;
unsigned int set = 1;
/* For tcp we use getpeerucred and it needs no initialization. */
if (ioctl(fd, I_FIND, "tcp") > 0)
return (0);
strioc.ic_cmd = TL_IOC_UCREDOPT;
strioc.ic_timout = -1;
strioc.ic_len = (int)sizeof (unsigned int);
strioc.ic_dp = (char *)&set;
if (ioctl(fd, I_STR, &strioc) == -1 &&
__rpc_tli_set_options(fd, SOL_SOCKET, SO_RECVUCRED, 1) == -1) {
syslog(LOG_ERR, "rpc_negotiate_uid (%s): %m",
"ioctl:I_STR:TL_IOC_UCREDOPT/SO_RECVUCRED");
return (-1);
}
return (0);
}
void
svc_fd_negotiate_ucred(int fd)
{
(void) __rpc_negotiate_uid(fd);
}
/*
* This returns the ucred of the caller. It assumes that the optbuf
* information is stored at xprt->xp_p2.
* There are three distinct cases: the option buffer is headed
* with a "struct opthdr" and the credential option is the only
* one, or it's a T_opthdr and our option may follow others; or there
* are no options and we attempt getpeerucred().
*/
static int
find_ucred_opt(const SVCXPRT *trans, ucred_t *uc, bool_t checkzone)
{
/* LINTED pointer alignment */
struct netbuf *abuf = (struct netbuf *)trans->xp_p2;
char *bufp, *maxbufp;
struct opthdr *opth;
static zoneid_t myzone = MIN_ZONEID - 1; /* invalid */
if (abuf == NULL || abuf->buf == NULL) {
if (getpeerucred(trans->xp_fd, &uc) == 0)
goto verifyzone;
return (-1);
}
#ifdef RPC_DEBUG
syslog(LOG_INFO, "find_ucred_opt %p %x", abuf->buf, abuf->len);
#endif
/* LINTED pointer cast */
opth = (struct opthdr *)abuf->buf;
if (opth->level == TL_PROT_LEVEL &&
opth->name == TL_OPT_PEER_UCRED &&
opth->len + sizeof (*opth) == abuf->len) {
#ifdef RPC_DEBUG
syslog(LOG_INFO, "find_ucred_opt (opthdr): OK!");
#endif
(void) memcpy(uc, &opth[1], opth->len);
/*
* Always from inside our zone because zones use a separate name
* space for loopback; at this time, the kernel may send a
* packet pretending to be from the global zone when it's
* really from our zone so we skip the zone check.
*/
return (0);
}
bufp = abuf->buf;
maxbufp = bufp + abuf->len;
while (bufp + sizeof (struct T_opthdr) < maxbufp) {
/* LINTED pointer cast */
struct T_opthdr *opt = (struct T_opthdr *)bufp;
#ifdef RPC_DEBUG
syslog(LOG_INFO, "find_ucred_opt opt: %p %x, %d %d", opt,
opt->len, opt->name, opt->level);
#endif
if (opt->len > maxbufp - bufp || (opt->len & 3))
return (-1);
if (opt->level == SOL_SOCKET && opt->name == SCM_UCRED &&
opt->len - sizeof (struct T_opthdr) <= ucred_size()) {
#ifdef RPC_DEBUG
syslog(LOG_INFO, "find_ucred_opt (T_opthdr): OK!");
#endif
(void) memcpy(uc, &opt[1],
opt->len - sizeof (struct T_opthdr));
goto verifyzone;
}
bufp += opt->len;
}
if (getpeerucred(trans->xp_fd, &uc) != 0)
return (-1);
verifyzone:
if (!checkzone)
return (0);
if (myzone == MIN_ZONEID - 1)
myzone = getzoneid();
/* Return 0 only for the local zone */
return (ucred_getzoneid(uc) == myzone ? 0 : -1);
}
/*
* Version for Solaris with new local transport code
*/
int
__rpc_get_local_uid(SVCXPRT *trans, uid_t *uid_out)
{
ucred_t *uc = alloca(ucred_size());
int err;
/* LINTED - pointer alignment */
if (svc_type(trans) == SVC_DOOR)
err = __svc_get_door_ucred(trans, uc) == FALSE;
else
err = find_ucred_opt(trans, uc, B_TRUE);
if (err != 0)
return (-1);
*uid_out = ucred_geteuid(uc);
return (0);
}
/*
* Return local credentials.
*/
bool_t
__rpc_get_local_cred(SVCXPRT *xprt, svc_local_cred_t *lcred)
{
ucred_t *uc = alloca(ucred_size());
int err;
/* LINTED - pointer alignment */
if (svc_type(xprt) == SVC_DOOR)
err = __svc_get_door_ucred(xprt, uc) == FALSE;
else
err = find_ucred_opt(xprt, uc, B_TRUE);
if (err != 0)
return (FALSE);
lcred->euid = ucred_geteuid(uc);
lcred->egid = ucred_getegid(uc);
lcred->ruid = ucred_getruid(uc);
lcred->rgid = ucred_getrgid(uc);
lcred->pid = ucred_getpid(uc);
return (TRUE);
}
/*
* Return local ucred.
*/
int
svc_getcallerucred(const SVCXPRT *trans, ucred_t **uc)
{
ucred_t *ucp = *uc;
int err;
if (ucp == NULL) {
ucp = malloc(ucred_size());
if (ucp == NULL)
return (-1);
}
/* LINTED - pointer alignment */
if (svc_type(trans) == SVC_DOOR)
err = __svc_get_door_ucred(trans, ucp) == FALSE;
else
err = find_ucred_opt(trans, ucp, B_FALSE);
if (err != 0) {
if (*uc == NULL)
free(ucp);
return (-1);
}
if (*uc == NULL)
*uc = ucp;
return (0);
}
/*
* get local ip address
*/
int
__rpc_get_ltaddr(struct netbuf *nbufp, struct netbuf *ltaddr)
{
unsigned int total_optlen;
struct T_opthdr *opt, *opt_start = NULL, *opt_end;
struct sockaddr_in *ipv4sa;
struct sockaddr_in6 *ipv6sa;
int s;
struct sioc_addrreq areq;
if (nbufp == (struct netbuf *)0 || ltaddr == (struct netbuf *)0) {
t_errno = TBADOPT;
return (-1);
}
total_optlen = nbufp->len;
if (total_optlen == 0)
return (1);
/* LINTED pointer alignment */
opt_start = (struct T_opthdr *)nbufp->buf;
if (opt_start == NULL) {
t_errno = TBADOPT;
return (-1);
}
/* Make sure the start of the buffer is aligned */
if (!(__TPI_TOPT_ISALIGNED(opt_start))) {
t_errno = TBADOPT;
return (-1);
}
/* LINTED pointer alignment */
opt_end = (struct T_opthdr *)((uchar_t *)opt_start + total_optlen);
opt = opt_start;
/*
* Look for the desired option header
*/
do {
if (((uchar_t *)opt + sizeof (struct T_opthdr)) >
(uchar_t *)opt_end) {
t_errno = TBADOPT;
return (-1);
}
if (opt->len < sizeof (struct T_opthdr)) {
t_errno = TBADOPT;
return (-1);
}
if (((uchar_t *)opt + opt->len) > (uchar_t *)opt_end) {
t_errno = TBADOPT;
return (-1);
}
switch (opt->level) {
case IPPROTO_IP:
if (opt->name == IP_RECVDSTADDR) {
struct sockaddr_in v4tmp;
opt++;
if (((uchar_t *)opt + sizeof (struct in_addr)) >
(uchar_t *)opt_end) {
t_errno = TBADOPT;
return (-1);
}
bzero(&v4tmp, sizeof (v4tmp));
v4tmp.sin_family = AF_INET;
v4tmp.sin_addr = *(struct in_addr *)opt;
#ifdef RPC_DEBUG
{
struct in_addr ia;
char str[INET_ADDRSTRLEN];
ia = *(struct in_addr *)opt;
(void) inet_ntop(AF_INET, &ia,
str, sizeof (str));
syslog(LOG_INFO,
"__rpc_get_ltaddr for IP_RECVDSTADDR: %s",
str);
}
#endif
if ((s = open("/dev/udp", O_RDONLY)) < 0) {
#ifdef RPC_DEBUG
syslog(LOG_ERR, "__rpc_get_ltaddr: "
"dev udp open failed");
#endif
return (1);
}
(void) memcpy(&areq.sa_addr, &v4tmp,
sizeof (v4tmp));
areq.sa_res = -1;
if (ioctl(s, SIOCTMYADDR, (caddr_t)&areq) < 0) {
syslog(LOG_ERR,
"get_ltaddr:ioctl for udp failed");
(void) close(s);
return (1);
}
(void) close(s);
if (areq.sa_res == 1) {
/* LINTED pointer cast */
ipv4sa = (struct sockaddr_in *)ltaddr->buf;
ipv4sa->sin_family = AF_INET;
ipv4sa->sin_addr = *(struct in_addr *)opt;
return (0);
} else
return (1);
}
break;
case IPPROTO_IPV6:
if (opt->name == IPV6_PKTINFO) {
struct sockaddr_in6 v6tmp;
opt++;
if (((uchar_t *)opt +
sizeof (struct in6_pktinfo)) >
(uchar_t *)opt_end) {
t_errno = TBADOPT;
return (-1);
}
bzero(&v6tmp, sizeof (v6tmp));
v6tmp.sin6_family = AF_INET6;
v6tmp.sin6_addr =
((struct in6_pktinfo *)opt)->ipi6_addr;
#ifdef RPC_DEBUG
{
struct in6_pktinfo *in6_pkt;
char str[INET6_ADDRSTRLEN];
in6_pkt = (struct in6_pktinfo *)opt;
(void) inet_ntop(AF_INET6, &in6_pkt->ipi6_addr,
str, sizeof (str));
syslog(LOG_INFO,
"__rpc_get_ltaddr for IPV6_PKTINFO: %s",
str);
}
#endif
if ((s = open("/dev/udp6", O_RDONLY)) < 0) {
#ifdef RPC_DEBUG
syslog(LOG_ERR, "__rpc_get_ltaddr: "
"dev udp6 open failed");
#endif
return (1);
}
(void) memcpy(&areq.sa_addr, &v6tmp,
sizeof (v6tmp));
areq.sa_res = -1;
if (ioctl(s, SIOCTMYADDR, (caddr_t)&areq) < 0) {
syslog(LOG_ERR,
"get_ltaddr:ioctl for udp6 failed");
(void) close(s);
return (1);
}
(void) close(s);
if (areq.sa_res == 1) {
/* LINTED pointer cast */
ipv6sa = (struct sockaddr_in6 *)ltaddr->buf;
ipv6sa->sin6_family = AF_INET6;
ipv6sa->sin6_addr =
((struct in6_pktinfo *)opt)->ipi6_addr;
return (0);
} else
return (1);
}
break;
default:
break;
}
/* LINTED improper alignment */
opt = (struct T_opthdr *)((uchar_t *)opt +
__TPI_ALIGN(opt->len));
} while (opt < opt_end);
return (1);
}
#define __TRANSPORT_INDSZ 128
int
__rpc_tli_set_options(int fd, int optlevel, int optname, int optval)
{
struct t_optmgmt oreq, ores;
struct opthdr *topt;
int *ip;
int optsz;
char buf[__TRANSPORT_INDSZ];
switch (optname) {
case SO_DONTLINGER: {
struct linger *ling;
/* LINTED */
ling = (struct linger *)
(buf + sizeof (struct opthdr));
ling->l_onoff = 0;
optsz = sizeof (struct linger);
break;
}
case SO_LINGER: {
struct linger *ling;
/* LINTED */
ling = (struct linger *)
(buf + sizeof (struct opthdr));
ling->l_onoff = 1;
ling->l_linger = (int)optval;
optsz = sizeof (struct linger);
break;
}
case IP_RECVDSTADDR:
case IPV6_RECVPKTINFO:
case SO_DEBUG:
case SO_KEEPALIVE:
case SO_DONTROUTE:
case SO_USELOOPBACK:
case SO_REUSEADDR:
case SO_DGRAM_ERRIND:
case SO_RECVUCRED:
case SO_ANON_MLP:
case SO_MAC_EXEMPT:
case SO_EXCLBIND:
case TCP_EXCLBIND:
case UDP_EXCLBIND:
/* LINTED */
ip = (int *)(buf + sizeof (struct opthdr));
*ip = optval;
optsz = sizeof (int);
break;
default:
return (-1);
}
/* LINTED */
topt = (struct opthdr *)buf;
topt->level = optlevel;
topt->name = optname;
topt->len = optsz;
oreq.flags = T_NEGOTIATE;
oreq.opt.len = sizeof (struct opthdr) + optsz;
oreq.opt.buf = buf;
ores.flags = 0;
ores.opt.buf = buf;
ores.opt.maxlen = __TRANSPORT_INDSZ;
if (t_optmgmt(fd, &oreq, &ores) < 0 ||
ores.flags != T_SUCCESS) {
return (-1);
}
return (0);
}
/*
* Format an error message corresponding to the given TLI and system error
* codes.
*/
void
__tli_sys_strerror(char *buf, size_t buflen, int tli_err, int sys_err)
{
char *errorstr;
if (tli_err == TSYSERR) {
errorstr = strerror(sys_err);
if (errorstr == NULL)
(void) snprintf(buf, buflen,
dgettext(__nsl_dom,
"Unknown system error %d"),
sys_err);
else
(void) strlcpy(buf, errorstr, buflen);
} else {
errorstr = t_strerror(tli_err);
(void) strlcpy(buf, errorstr, buflen);
}
}
/*
* Depending on the specified RPC number, attempt to set mac_exempt
* option on the opened socket; these requests need to be able to do MAC
* MAC read-down operations. Privilege is needed to set this option.
*/
void
__rpc_set_mac_options(int fd, const struct netconfig *nconf, rpcprog_t prognum)
{
int ret = 0;
if (!is_system_labeled())
return;
if (strcmp(nconf->nc_protofmly, NC_INET) != 0 &&
strcmp(nconf->nc_protofmly, NC_INET6) != 0)
return;
if (is_multilevel(prognum)) {
ret = __rpc_tli_set_options(fd, SOL_SOCKET, SO_MAC_EXEMPT, 1);
if (ret < 0) {
char errorstr[100];
__tli_sys_strerror(errorstr, sizeof (errorstr),
t_errno, errno);
(void) syslog(LOG_ERR, "rpc_set_mac_options: %s",
errorstr);
}
}
}