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|
/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* kadmin/server/network.c
*
* Copyright 1990,2000,2007,2008,2009 by the Massachusetts Institute of Technology.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
*
* Network code for Kerberos v5 kadmin server (based on KDC code).
*/
#include "k5-int.h"
#include "com_err.h"
#include "kadm5/admin.h"
#include "kadm5/server_internal.h"
#include "kadm5/kadm_rpc.h"
#include "iprop.h"
#include "adm_proto.h"
#include "misc.h"
#include <sys/ioctl.h>
#include <syslog.h>
#include <stddef.h>
#include <ctype.h>
#include "port-sockets.h"
#include "socket-utils.h"
#ifdef HAVE_NETINET_IN_H
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#ifdef HAVE_SYS_SOCKIO_H
/* for SIOCGIFCONF, etc. */
#include <sys/sockio.h>
#endif
#include <sys/time.h>
#if HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#include <arpa/inet.h>
#ifndef ARPHRD_ETHER /* OpenBSD breaks on multiple inclusions */
#include <net/if.h>
#endif
#ifdef HAVE_SYS_FILIO_H
#include <sys/filio.h> /* FIONBIO */
#endif
#include "fake-addrinfo.h"
/* XXX */
#define KDC5_NONET (-1779992062L)
/* Misc utility routines. */
static void
set_sa_port(struct sockaddr *addr, int port)
{
switch (addr->sa_family) {
case AF_INET:
sa2sin(addr)->sin_port = port;
break;
#ifdef KRB5_USE_INET6
case AF_INET6:
sa2sin6(addr)->sin6_port = port;
break;
#endif
default:
break;
}
}
static int ipv6_enabled()
{
#ifdef KRB5_USE_INET6
static int result = -1;
if (result == -1) {
int s;
s = socket(AF_INET6, SOCK_STREAM, 0);
if (s >= 0) {
result = 1;
close(s);
} else
result = 0;
}
return result;
#else
return 0;
#endif
}
static int
setreuseaddr(int sock, int value)
{
return setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &value, sizeof(value));
}
#if defined(KRB5_USE_INET6) && defined(IPV6_V6ONLY)
static int
setv6only(int sock, int value)
{
return setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, &value, sizeof(value));
}
#endif
/* Use RFC 3542 API below, but fall back from IPV6_RECVPKTINFO to
IPV6_PKTINFO for RFC 2292 implementations. */
#ifndef IPV6_RECVPKTINFO
#define IPV6_RECVPKTINFO IPV6_PKTINFO
#endif
/* Parallel, though not standardized. */
#ifndef IP_RECVPKTINFO
#define IP_RECVPKTINFO IP_PKTINFO
#endif
static int
set_pktinfo(int sock, int family)
{
int sockopt = 1;
int option = 0, proto = 0;
switch (family) {
#if defined(IP_PKTINFO) && defined(HAVE_STRUCT_IN_PKTINFO)
case AF_INET:
proto = IPPROTO_IP;
option = IP_RECVPKTINFO;
break;
#endif
#if defined(IPV6_PKTINFO) && defined(HAVE_STRUCT_IN6_PKTINFO)
case AF_INET6:
proto = IPPROTO_IPV6;
option = IPV6_RECVPKTINFO;
break;
#endif
default:
return EINVAL;
}
if (setsockopt(sock, proto, option, &sockopt, sizeof(sockopt)))
return errno;
return 0;
}
static const char *paddr (struct sockaddr *sa)
{
static char buf[100];
char portbuf[10];
if (getnameinfo(sa, socklen(sa),
buf, sizeof(buf), portbuf, sizeof(portbuf),
NI_NUMERICHOST|NI_NUMERICSERV))
strlcpy(buf, "<unprintable>", sizeof(buf));
else {
unsigned int len = sizeof(buf) - strlen(buf);
char *p = buf + strlen(buf);
if (len > 2+strlen(portbuf)) {
*p++ = '.';
len--;
strncpy(p, portbuf, len);
}
}
return buf;
}
/* kadmin data. */
enum conn_type {
CONN_UDP, CONN_UDP_PKTINFO, CONN_TCP_LISTENER, CONN_TCP,
CONN_RPC_LISTENER, CONN_RPC,
CONN_ROUTING
};
/* Per-connection info. */
struct connection {
int fd;
enum conn_type type;
void (*service)(void *handle, struct connection *, const char *, int);
union {
/* Type-specific information. */
struct {
/* connection */
struct sockaddr_storage addr_s;
socklen_t addrlen;
char addrbuf[56];
krb5_fulladdr faddr;
krb5_address kaddr;
/* incoming */
size_t bufsiz;
size_t offset;
char *buffer;
size_t msglen;
/* outgoing */
krb5_data *response;
unsigned char lenbuf[4];
sg_buf sgbuf[2];
sg_buf *sgp;
int sgnum;
/* crude denial-of-service avoidance support */
time_t start_time;
} tcp;
struct {
SVCXPRT *transp;
} rpc;
} u;
};
#define SET(TYPE) struct { TYPE *data; int n, max; }
/* Start at the top and work down -- this should allow for deletions
without disrupting the iteration, since we delete by overwriting
the element to be removed with the last element. */
#define FOREACH_ELT(set,idx,vvar) \
for (idx = set.n-1; idx >= 0 && (vvar = set.data[idx], 1); idx--)
#define GROW_SET(set, incr, tmpptr) \
(((int)(set.max + incr) < set.max \
|| (((size_t)((int)(set.max + incr) * sizeof(set.data[0])) \
/ sizeof(set.data[0])) \
!= (set.max + incr))) \
? 0 /* overflow */ \
: ((tmpptr = realloc(set.data, \
(int)(set.max + incr) * sizeof(set.data[0]))) \
? (set.data = tmpptr, set.max += incr, 1) \
: 0))
/* 1 = success, 0 = failure */
#define ADD(set, val, tmpptr) \
((set.n < set.max || GROW_SET(set, 10, tmpptr)) \
? (set.data[set.n++] = val, 1) \
: 0)
#define DEL(set, idx) \
(set.data[idx] = set.data[--set.n], 0)
#define FREE_SET_DATA(set) \
(free(set.data), set.data = 0, set.max = 0, set.n = 0)
/* Set<struct connection *> connections; */
static SET(struct connection *) connections;
#define n_sockets connections.n
#define conns connections.data
/* Set<u_short> udp_port_data, tcp_port_data; */
/*
* N.B.: The Emacs cc-mode indentation code seems to get confused if
* the macro argument here is one word only. So use "unsigned short"
* instead of the "u_short" we were using before.
*/
static SET(unsigned short) udp_port_data, tcp_port_data;
struct rpc_svc_data {
u_short port;
u_long prognum;
u_long versnum;
void (*dispatch)();
};
static SET(struct rpc_svc_data) rpc_svc_data;
#include "cm.h"
static struct select_state sstate;
static fd_set rpc_listenfds;
static krb5_error_code add_udp_port(int port)
{
int i;
void *tmp;
u_short val;
u_short s_port = port;
if (s_port != port)
return EINVAL;
FOREACH_ELT (udp_port_data, i, val)
if (s_port == val)
return 0;
if (!ADD(udp_port_data, s_port, tmp))
return ENOMEM;
return 0;
}
static krb5_error_code add_tcp_port(int port)
{
int i;
void *tmp;
u_short val;
u_short s_port = port;
if (s_port != port)
return EINVAL;
FOREACH_ELT (tcp_port_data, i, val)
if (s_port == val)
return 0;
if (!ADD(tcp_port_data, s_port, tmp))
return ENOMEM;
return 0;
}
static krb5_error_code add_rpc_service(int port, u_long prognum, u_long versnum,
void (*dispatch)())
{
int i;
void *tmp;
struct rpc_svc_data svc, val;
svc.port = port;
if (svc.port != port)
return EINVAL;
svc.prognum = prognum;
svc.versnum = versnum;
svc.dispatch = dispatch;
FOREACH_ELT (rpc_svc_data, i, val) {
if (val.port == port)
return 0;
}
if (!ADD(rpc_svc_data, svc, tmp))
return ENOMEM;
return 0;
}
#define USE_AF AF_INET
#define USE_TYPE SOCK_DGRAM
#define USE_PROTO 0
#define SOCKET_ERRNO errno
#include "foreachaddr.h"
struct socksetup {
const char *prog;
krb5_error_code retval;
int udp_flags;
#define UDP_DO_IPV4 1
#define UDP_DO_IPV6 2
};
static struct connection *
add_fd (struct socksetup *data, int sock, enum conn_type conntype,
void (*service)(void *handle, struct connection *, const char *, int))
{
struct connection *newconn;
void *tmp;
#ifndef _WIN32
if (sock >= FD_SETSIZE) {
data->retval = EMFILE; /* XXX */
com_err(data->prog, 0,
"file descriptor number %d too high", sock);
return 0;
}
#endif
newconn = (struct connection *)malloc(sizeof(*newconn));
if (newconn == NULL) {
data->retval = ENOMEM;
com_err(data->prog, ENOMEM,
"cannot allocate storage for connection info");
return 0;
}
if (!ADD(connections, newconn, tmp)) {
data->retval = ENOMEM;
com_err(data->prog, ENOMEM, "cannot save socket info");
free(newconn);
return 0;
}
memset(newconn, 0, sizeof(*newconn));
newconn->type = conntype;
newconn->fd = sock;
newconn->service = service;
return newconn;
}
static void process_packet(void *handle, struct connection *, const char *, int);
static void accept_tcp_connection(void *handle, struct connection *, const char *, int);
static void process_tcp_connection(void *handle, struct connection *, const char *, int);
static void accept_rpc_connection(void *handle, struct connection *, const char *, int);
static void process_rpc_connection(void *handle, struct connection *, const char *, int);
static struct connection *
add_udp_fd (struct socksetup *data, int sock, int pktinfo)
{
return add_fd(data, sock, pktinfo ? CONN_UDP_PKTINFO : CONN_UDP,
process_packet);
}
static struct connection *
add_tcp_listener_fd (struct socksetup *data, int sock)
{
return add_fd(data, sock, CONN_TCP_LISTENER, accept_tcp_connection);
}
static struct connection *
add_tcp_data_fd (struct socksetup *data, int sock)
{
return add_fd(data, sock, CONN_TCP, process_tcp_connection);
}
static void
delete_fd (struct connection *xconn)
{
struct connection *conn;
int i;
FOREACH_ELT(connections, i, conn)
if (conn == xconn) {
DEL(connections, i);
break;
}
free(xconn);
}
static struct connection *
add_rpc_listener_fd (struct socksetup *data, struct rpc_svc_data *svc, int sock)
{
struct connection *conn;
conn = add_fd(data, sock, CONN_RPC_LISTENER, accept_rpc_connection);
if (conn == NULL)
return NULL;
conn->u.rpc.transp = svctcp_create(sock, 0, 0);
if (conn->u.rpc.transp == NULL) {
krb5_klog_syslog(LOG_ERR, "Cannot create RPC service: %s; continuing",
strerror(errno));
delete_fd(conn);
return NULL;
}
if (!svc_register(conn->u.rpc.transp, svc->prognum, svc->versnum,
svc->dispatch, 0)) {
krb5_klog_syslog(LOG_ERR, "Cannot register RPC service: %s; continuing",
strerror(errno));
delete_fd(conn);
return NULL;
}
return conn;
}
static struct connection *
add_rpc_data_fd (struct socksetup *data, int sock)
{
return add_fd(data, sock, CONN_RPC, process_rpc_connection);
}
static const int one = 1;
static int
setnbio(int sock)
{
return ioctlsocket(sock, FIONBIO, (const void *)&one);
}
static int
setkeepalive(int sock)
{
return setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, &one, sizeof(one));
}
static int
setnolinger(int s)
{
static const struct linger ling = { 0, 0 };
return setsockopt(s, SOL_SOCKET, SO_LINGER, &ling, sizeof(ling));
}
/* Returns -1 or socket fd. */
static int
setup_a_tcp_listener(struct socksetup *data, struct sockaddr *addr)
{
int sock;
sock = socket(addr->sa_family, SOCK_STREAM, 0);
if (sock == -1) {
com_err(data->prog, errno, "Cannot create TCP server socket on %s",
paddr(addr));
return -1;
}
set_cloexec_fd(sock);
#ifndef _WIN32
if (sock >= FD_SETSIZE) {
close(sock);
com_err(data->prog, 0, "TCP socket fd number %d (for %s) too high",
sock, paddr(addr));
return -1;
}
#endif
if (setreuseaddr(sock, 1) < 0)
com_err(data->prog, errno,
"Cannot enable SO_REUSEADDR on fd %d", sock);
#ifdef KRB5_USE_INET6
if (addr->sa_family == AF_INET6) {
#ifdef IPV6_V6ONLY
if (setv6only(sock, 1))
com_err(data->prog, errno, "setsockopt(%d,IPV6_V6ONLY,1) failed",
sock);
else
com_err(data->prog, 0, "setsockopt(%d,IPV6_V6ONLY,1) worked",
sock);
#else
krb5_klog_syslog(LOG_INFO, "no IPV6_V6ONLY socket option support");
#endif /* IPV6_V6ONLY */
}
#endif /* KRB5_USE_INET6 */
if (bind(sock, addr, socklen(addr)) == -1) {
com_err(data->prog, errno,
"Cannot bind TCP server socket on %s", paddr(addr));
close(sock);
return -1;
}
if (listen(sock, 5) < 0) {
com_err(data->prog, errno, "Cannot listen on TCP server socket on %s",
paddr(addr));
close(sock);
return -1;
}
if (setnbio(sock)) {
com_err(data->prog, errno,
"cannot set listening tcp socket on %s non-blocking",
paddr(addr));
close(sock);
return -1;
}
if (setnolinger(sock)) {
com_err(data->prog, errno, "disabling SO_LINGER on TCP socket on %s",
paddr(addr));
close(sock);
return -1;
}
return sock;
}
/* Returns -1 or socket fd. */
static int
setup_a_rpc_listener(struct socksetup *data, struct sockaddr *addr)
{
int sock;
sock = socket(addr->sa_family, SOCK_STREAM, 0);
if (sock == -1) {
com_err(data->prog, errno, "Cannot create RPC server socket on %s",
paddr(addr));
return -1;
}
set_cloexec_fd(sock);
#ifndef _WIN32
if (sock >= FD_SETSIZE) {
close(sock);
com_err(data->prog, 0, "RPC socket fd number %d (for %s) too high",
sock, paddr(addr));
return -1;
}
#endif
if (setreuseaddr(sock, 1) < 0)
com_err(data->prog, errno,
"Cannot enable SO_REUSEADDR on fd %d", sock);
if (bind(sock, addr, socklen(addr)) == -1) {
com_err(data->prog, errno,
"Cannot bind RPC server socket on %s", paddr(addr));
close(sock);
return -1;
}
return sock;
}
static int
setup_tcp_listener_ports(struct socksetup *data)
{
struct sockaddr_in sin4;
#ifdef KRB5_USE_INET6
struct sockaddr_in6 sin6;
#endif
int i, port;
memset(&sin4, 0, sizeof(sin4));
sin4.sin_family = AF_INET;
#ifdef HAVE_SA_LEN
sin4.sin_len = sizeof(sin4);
#endif
sin4.sin_addr.s_addr = INADDR_ANY;
#ifdef KRB5_USE_INET6
memset(&sin6, 0, sizeof(sin6));
sin6.sin6_family = AF_INET6;
#ifdef SIN6_LEN
sin6.sin6_len = sizeof(sin6);
#endif
sin6.sin6_addr = in6addr_any;
#endif
FOREACH_ELT (tcp_port_data, i, port) {
int s4, s6;
set_sa_port((struct sockaddr *)&sin4, htons(port));
if (!ipv6_enabled()) {
s4 = setup_a_tcp_listener(data, (struct sockaddr *)&sin4);
if (s4 < 0)
return -1;
s6 = -1;
} else {
#ifndef KRB5_USE_INET6
abort();
#else
s4 = s6 = -1;
set_sa_port((struct sockaddr *)&sin6, htons(port));
s6 = setup_a_tcp_listener(data, (struct sockaddr *)&sin6);
if (s6 < 0)
return -1;
s4 = setup_a_tcp_listener(data, (struct sockaddr *)&sin4);
#endif /* KRB5_USE_INET6 */
}
/* Sockets are created, prepare to listen on them. */
if (s4 >= 0) {
if (add_tcp_listener_fd(data, s4) == NULL)
close(s4);
else {
FD_SET(s4, &sstate.rfds);
if (s4 >= sstate.max)
sstate.max = s4 + 1;
krb5_klog_syslog(LOG_INFO, "listening on fd %d: tcp %s",
s4, paddr((struct sockaddr *)&sin4));
}
}
#ifdef KRB5_USE_INET6
if (s6 >= 0) {
if (add_tcp_listener_fd(data, s6) == NULL) {
close(s6);
s6 = -1;
} else {
FD_SET(s6, &sstate.rfds);
if (s6 >= sstate.max)
sstate.max = s6 + 1;
krb5_klog_syslog(LOG_INFO, "listening on fd %d: tcp %s",
s6, paddr((struct sockaddr *)&sin6));
}
if (s4 < 0)
krb5_klog_syslog(LOG_INFO,
"assuming IPv6 socket accepts IPv4");
}
#endif
}
return 0;
}
static int
setup_rpc_listener_ports(struct socksetup *data)
{
struct sockaddr_in sin4;
int i;
struct rpc_svc_data svc;
memset(&sin4, 0, sizeof(sin4));
sin4.sin_family = AF_INET;
#ifdef HAVE_SA_LEN
sin4.sin_len = sizeof(sin4);
#endif
sin4.sin_addr.s_addr = INADDR_ANY;
FOREACH_ELT (rpc_svc_data, i, svc) {
int s4;
set_sa_port((struct sockaddr *)&sin4, htons(svc.port));
s4 = setup_a_rpc_listener(data, (struct sockaddr *)&sin4);
if (s4 < 0)
return -1;
else {
if (add_rpc_listener_fd(data, &svc, s4) == NULL)
close(s4);
else {
FD_SET(s4, &sstate.rfds);
if (s4 >= sstate.max)
sstate.max = s4 + 1;
krb5_klog_syslog(LOG_INFO, "listening on fd %d: rpc %s",
s4, paddr((struct sockaddr *)&sin4));
}
}
}
FD_ZERO(&rpc_listenfds);
rpc_listenfds = svc_fdset;
return 0;
}
#if defined(CMSG_SPACE) && defined(HAVE_STRUCT_CMSGHDR) && (defined(IP_PKTINFO) || defined(IPV6_PKTINFO))
union pktinfo {
#ifdef HAVE_STRUCT_IN6_PKTINFO
struct in6_pktinfo pi6;
#endif
#ifdef HAVE_STRUCT_IN_PKTINFO
struct in_pktinfo pi4;
#endif
char c;
};
static int
setup_udp_port_1(struct socksetup *data, struct sockaddr *addr,
char *haddrbuf, int pktinfo);
static void
setup_udp_pktinfo_ports(struct socksetup *data)
{
#ifdef IP_PKTINFO
{
struct sockaddr_in sa;
int r;
memset(&sa, 0, sizeof(sa));
sa.sin_family = AF_INET;
#ifdef HAVE_SA_LEN
sa.sin_len = sizeof(sa);
#endif
r = setup_udp_port_1(data, (struct sockaddr *) &sa, "0.0.0.0", 4);
if (r == 0)
data->udp_flags &= ~UDP_DO_IPV4;
}
#endif
#ifdef IPV6_PKTINFO
{
struct sockaddr_in6 sa;
int r;
memset(&sa, 0, sizeof(sa));
sa.sin6_family = AF_INET6;
#ifdef HAVE_SA_LEN
sa.sin6_len = sizeof(sa);
#endif
r = setup_udp_port_1(data, (struct sockaddr *) &sa, "::", 6);
if (r == 0)
data->udp_flags &= ~UDP_DO_IPV6;
}
#endif
}
#else /* no pktinfo compile-time support */
static void
setup_udp_pktinfo_ports(struct socksetup *data)
{
}
#endif
static int
setup_udp_port_1(struct socksetup *data, struct sockaddr *addr,
char *haddrbuf, int pktinfo)
{
int sock = -1, i, r;
u_short port;
FOREACH_ELT (udp_port_data, i, port) {
sock = socket (addr->sa_family, SOCK_DGRAM, 0);
if (sock == -1) {
data->retval = errno;
com_err(data->prog, data->retval,
"Cannot create server socket for port %d address %s",
port, haddrbuf);
return 1;
}
set_cloexec_fd(sock);
#ifdef KRB5_USE_INET6
if (addr->sa_family == AF_INET6) {
#ifdef IPV6_V6ONLY
if (setv6only(sock, 1))
com_err(data->prog, errno,
"setsockopt(%d,IPV6_V6ONLY,1) failed", sock);
else
com_err(data->prog, 0, "setsockopt(%d,IPV6_V6ONLY,1) worked",
sock);
#else
krb5_klog_syslog(LOG_INFO, "no IPV6_V6ONLY socket option support");
#endif /* IPV6_V6ONLY */
}
#endif
set_sa_port(addr, htons(port));
if (bind (sock, (struct sockaddr *)addr, socklen (addr)) == -1) {
data->retval = errno;
com_err(data->prog, data->retval,
"Cannot bind server socket to port %d address %s",
port, haddrbuf);
close(sock);
return 1;
}
#if !(defined(CMSG_SPACE) && defined(HAVE_STRUCT_CMSGHDR) && (defined(IP_PKTINFO) || defined(IPV6_PKTINFO)))
assert(pktinfo == 0);
#endif
if (pktinfo) {
r = set_pktinfo(sock, addr->sa_family);
if (r) {
com_err(data->prog, r,
"Cannot request packet info for udp socket address %s port %d",
haddrbuf, port);
close(sock);
return 1;
}
}
krb5_klog_syslog (LOG_INFO, "listening on fd %d: udp %s%s", sock,
paddr((struct sockaddr *)addr),
pktinfo ? " (pktinfo)" : "");
if (add_udp_fd (data, sock, pktinfo) == 0) {
close(sock);
return 1;
}
FD_SET (sock, &sstate.rfds);
if (sock >= sstate.max)
sstate.max = sock + 1;
}
return 0;
}
static int
setup_udp_port(void *P_data, struct sockaddr *addr)
{
struct socksetup *data = P_data;
char haddrbuf[NI_MAXHOST];
int err;
if (addr->sa_family == AF_INET && !(data->udp_flags & UDP_DO_IPV4))
return 0;
#ifdef AF_INET6
if (addr->sa_family == AF_INET6 && !(data->udp_flags & UDP_DO_IPV6))
return 0;
#endif
err = getnameinfo(addr, socklen(addr), haddrbuf, sizeof(haddrbuf),
0, 0, NI_NUMERICHOST);
if (err)
strlcpy(haddrbuf, "<unprintable>", sizeof(haddrbuf));
switch (addr->sa_family) {
case AF_INET:
break;
#ifdef AF_INET6
case AF_INET6:
#ifdef KRB5_USE_INET6
break;
#else
{
static int first = 1;
if (first) {
krb5_klog_syslog (LOG_INFO, "skipping local ipv6 addresses");
first = 0;
}
return 0;
}
#endif
#endif
#ifdef AF_LINK /* some BSD systems, AIX */
case AF_LINK:
return 0;
#endif
#ifdef AF_DLI /* Direct Link Interface - DEC Ultrix/OSF1 link layer? */
case AF_DLI:
return 0;
#endif
#ifdef AF_APPLETALK
case AF_APPLETALK:
return 0;
#endif
default:
krb5_klog_syslog (LOG_INFO,
"skipping unrecognized local address family %d",
addr->sa_family);
return 0;
}
return setup_udp_port_1(data, addr, haddrbuf, 0);
}
#if 1
static void klog_handler(const void *data, size_t len)
{
static char buf[BUFSIZ];
static int bufoffset;
void *p;
#define flush_buf() \
(bufoffset \
? (((buf[0] == 0 || buf[0] == '\n') \
? (fork()==0?abort():(void)0) \
: (void)0), \
krb5_klog_syslog(LOG_INFO, "%s", buf), \
memset(buf, 0, sizeof(buf)), \
bufoffset = 0) \
: 0)
p = memchr(data, 0, len);
if (p)
len = (const char *)p - (const char *)data;
scan_for_newlines:
if (len == 0)
return;
p = memchr(data, '\n', len);
if (p) {
if (p != data)
klog_handler(data, (size_t)((const char *)p - (const char *)data));
flush_buf();
len -= ((const char *)p - (const char *)data) + 1;
data = 1 + (const char *)p;
goto scan_for_newlines;
} else if (len > sizeof(buf) - 1 || len + bufoffset > sizeof(buf) - 1) {
size_t x = sizeof(buf) - len - 1;
klog_handler(data, x);
flush_buf();
len -= x;
data = (const char *)data + x;
goto scan_for_newlines;
} else {
memcpy(buf + bufoffset, data, len);
bufoffset += len;
}
}
#endif
static int network_reconfiguration_needed = 0;
#ifdef HAVE_STRUCT_RT_MSGHDR
#include <net/route.h>
static char *rtm_type_name(int type)
{
switch (type) {
case RTM_ADD: return "RTM_ADD";
case RTM_DELETE: return "RTM_DELETE";
case RTM_NEWADDR: return "RTM_NEWADDR";
case RTM_DELADDR: return "RTM_DELADDR";
case RTM_IFINFO: return "RTM_IFINFO";
case RTM_OLDADD: return "RTM_OLDADD";
case RTM_OLDDEL: return "RTM_OLDDEL";
case RTM_RESOLVE: return "RTM_RESOLVE";
#ifdef RTM_NEWMADDR
case RTM_NEWMADDR: return "RTM_NEWMADDR";
case RTM_DELMADDR: return "RTM_DELMADDR";
#endif
case RTM_MISS: return "RTM_MISS";
case RTM_REDIRECT: return "RTM_REDIRECT";
case RTM_LOSING: return "RTM_LOSING";
case RTM_GET: return "RTM_GET";
default: return "?";
}
}
static void process_routing_update(void *handle, struct connection *conn,
const char *prog, int selflags)
{
int n_read;
struct rt_msghdr rtm;
krb5_klog_syslog(LOG_INFO, "routing socket readable");
while ((n_read = read(conn->fd, &rtm, sizeof(rtm))) > 0) {
if (n_read < sizeof(rtm)) {
/* Quick hack to figure out if the interesting
fields are present in a short read.
A short read seems to be normal for some message types.
Only complain if we don't have the critical initial
header fields. */
#define RS(FIELD) (offsetof(struct rt_msghdr, FIELD) + sizeof(rtm.FIELD))
if (n_read < RS(rtm_type) ||
n_read < RS(rtm_version) ||
n_read < RS(rtm_msglen)) {
krb5_klog_syslog(LOG_ERR,
"short read (%d/%d) from routing socket",
n_read, (int) sizeof(rtm));
return;
}
}
krb5_klog_syslog(LOG_INFO,
"got routing msg type %d(%s) v%d",
rtm.rtm_type, rtm_type_name(rtm.rtm_type),
rtm.rtm_version);
if (rtm.rtm_msglen > sizeof(rtm)) {
/* It appears we get a partial message and the rest is
thrown away? */
} else if (rtm.rtm_msglen != n_read) {
krb5_klog_syslog(LOG_ERR,
"read %d from routing socket but msglen is %d",
n_read, rtm.rtm_msglen);
}
switch (rtm.rtm_type) {
case RTM_ADD:
case RTM_DELETE:
case RTM_NEWADDR:
case RTM_DELADDR:
case RTM_IFINFO:
case RTM_OLDADD:
case RTM_OLDDEL:
krb5_klog_syslog(LOG_INFO, "reconfiguration needed");
network_reconfiguration_needed = 1;
break;
case RTM_RESOLVE:
#ifdef RTM_NEWMADDR
case RTM_NEWMADDR:
case RTM_DELMADDR:
#endif
case RTM_MISS:
case RTM_REDIRECT:
case RTM_LOSING:
case RTM_GET:
/* Not interesting. */
krb5_klog_syslog(LOG_DEBUG, "routing msg not interesting");
break;
default:
krb5_klog_syslog(LOG_INFO, "unhandled routing message type, will reconfigure just for the fun of it");
network_reconfiguration_needed = 1;
break;
}
}
}
static void
setup_routing_socket(struct socksetup *data)
{
int sock = socket(PF_ROUTE, SOCK_RAW, 0);
if (sock < 0) {
int e = errno;
krb5_klog_syslog(LOG_INFO, "couldn't set up routing socket: %s",
strerror(e));
} else {
krb5_klog_syslog(LOG_INFO, "routing socket is fd %d", sock);
add_fd(data, sock, CONN_ROUTING, process_routing_update);
setnbio(sock);
FD_SET(sock, &sstate.rfds);
}
}
#endif
/* XXX */
extern int krb5int_debug_sendto_kdc;
extern void (*krb5int_sendtokdc_debug_handler)(const void*, size_t);
krb5_error_code
setup_network(void *handle, const char *prog)
{
struct socksetup setup_data;
krb5_error_code retval;
kadm5_server_handle_t server_handle = (kadm5_server_handle_t)handle;
FD_ZERO(&sstate.rfds);
FD_ZERO(&sstate.wfds);
FD_ZERO(&sstate.xfds);
sstate.max = 0;
/* krb5int_debug_sendto_kdc = 1; */
krb5int_sendtokdc_debug_handler = klog_handler;
retval = add_udp_port(server_handle->params.kpasswd_port);
if (retval)
return retval;
retval = add_tcp_port(server_handle->params.kpasswd_port);
if (retval)
return retval;
retval = add_rpc_service(server_handle->params.kadmind_port,
KADM, KADMVERS,
kadm_1);
if (retval)
return retval;
#ifndef DISABLE_IPROP
if (server_handle->params.iprop_enabled) {
retval = add_rpc_service(server_handle->params.iprop_port,
KRB5_IPROP_PROG, KRB5_IPROP_VERS,
krb5_iprop_prog_1);
if (retval)
return retval;
}
#endif /* DISABLE_IPROP */
setup_data.prog = prog;
setup_data.retval = 0;
krb5_klog_syslog (LOG_INFO, "setting up network...");
#ifdef HAVE_STRUCT_RT_MSGHDR
setup_routing_socket(&setup_data);
#endif
/* To do: Use RFC 2292 interface (or follow-on) and IPV6_PKTINFO,
so we might need only one UDP socket; fall back to binding
sockets on each address only if IPV6_PKTINFO isn't
supported. */
setup_data.udp_flags = UDP_DO_IPV4 | UDP_DO_IPV6;
setup_udp_pktinfo_ports(&setup_data);
if (setup_data.udp_flags) {
if (foreach_localaddr (&setup_data, setup_udp_port, 0, 0)) {
return setup_data.retval;
}
}
setup_tcp_listener_ports(&setup_data);
setup_rpc_listener_ports(&setup_data);
krb5_klog_syslog (LOG_INFO, "set up %d sockets", n_sockets);
if (n_sockets == 0) {
com_err(prog, 0, "no sockets set up?");
exit (1);
}
return 0;
}
static void init_addr(krb5_fulladdr *faddr, struct sockaddr *sa)
{
switch (sa->sa_family) {
case AF_INET:
faddr->address->addrtype = ADDRTYPE_INET;
faddr->address->length = 4;
faddr->address->contents = (krb5_octet *) &sa2sin(sa)->sin_addr;
faddr->port = ntohs(sa2sin(sa)->sin_port);
break;
#ifdef KRB5_USE_INET6
case AF_INET6:
if (IN6_IS_ADDR_V4MAPPED(&sa2sin6(sa)->sin6_addr)) {
faddr->address->addrtype = ADDRTYPE_INET;
faddr->address->length = 4;
faddr->address->contents = 12 + (krb5_octet *) &sa2sin6(sa)->sin6_addr;
} else {
faddr->address->addrtype = ADDRTYPE_INET6;
faddr->address->length = 16;
faddr->address->contents = (krb5_octet *) &sa2sin6(sa)->sin6_addr;
}
faddr->port = ntohs(sa2sin6(sa)->sin6_port);
break;
#endif
default:
faddr->address->addrtype = -1;
faddr->address->length = 0;
faddr->address->contents = 0;
faddr->port = 0;
break;
}
}
/* This holds whatever additional information might be needed to
properly send back to the client from the correct local address.
In this case, we only need one datum so far: On Mac OS X, the
kernel doesn't seem to like sending from link-local addresses
unless we specify the correct interface. */
union aux_addressing_info {
int ipv6_ifindex;
};
static int
recv_from_to(int s, void *buf, size_t len, int flags,
struct sockaddr *from, socklen_t *fromlen,
struct sockaddr *to, socklen_t *tolen,
union aux_addressing_info *auxaddr)
{
#if (!defined(IP_PKTINFO) && !defined(IPV6_PKTINFO)) || !defined(CMSG_SPACE)
if (to && tolen) {
/* Clobber with something recognizeable in case we try to use
the address. */
memset(to, 0x40, *tolen);
*tolen = 0;
}
return recvfrom(s, buf, len, flags, from, fromlen);
#else
int r;
struct iovec iov;
char cmsg[CMSG_SPACE(sizeof(union pktinfo))];
struct cmsghdr *cmsgptr;
struct msghdr msg;
if (!to || !tolen)
return recvfrom(s, buf, len, flags, from, fromlen);
/* Clobber with something recognizeable in case we can't extract
the address but try to use it anyways. */
memset(to, 0x40, *tolen);
iov.iov_base = buf;
iov.iov_len = len;
memset(&msg, 0, sizeof(msg));
msg.msg_name = from;
msg.msg_namelen = *fromlen;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_control = cmsg;
msg.msg_controllen = sizeof(cmsg);
r = recvmsg(s, &msg, flags);
if (r < 0)
return r;
*fromlen = msg.msg_namelen;
/* On Darwin (and presumably all *BSD with KAME stacks),
CMSG_FIRSTHDR doesn't check for a non-zero controllen. RFC
3542 recommends making this check, even though the (new) spec
for CMSG_FIRSTHDR says it's supposed to do the check. */
if (msg.msg_controllen) {
cmsgptr = CMSG_FIRSTHDR(&msg);
while (cmsgptr) {
#ifdef IP_PKTINFO
if (cmsgptr->cmsg_level == IPPROTO_IP
&& cmsgptr->cmsg_type == IP_PKTINFO
&& *tolen >= sizeof(struct sockaddr_in)) {
struct in_pktinfo *pktinfo;
memset(to, 0, sizeof(struct sockaddr_in));
pktinfo = (struct in_pktinfo *)CMSG_DATA(cmsgptr);
((struct sockaddr_in *)to)->sin_addr = pktinfo->ipi_addr;
((struct sockaddr_in *)to)->sin_family = AF_INET;
*tolen = sizeof(struct sockaddr_in);
return r;
}
#endif
#if defined(KRB5_USE_INET6) && defined(IPV6_PKTINFO)&& defined(HAVE_STRUCT_IN6_PKTINFO)
if (cmsgptr->cmsg_level == IPPROTO_IPV6
&& cmsgptr->cmsg_type == IPV6_PKTINFO
&& *tolen >= sizeof(struct sockaddr_in6)) {
struct in6_pktinfo *pktinfo;
memset(to, 0, sizeof(struct sockaddr_in6));
pktinfo = (struct in6_pktinfo *)CMSG_DATA(cmsgptr);
((struct sockaddr_in6 *)to)->sin6_addr = pktinfo->ipi6_addr;
((struct sockaddr_in6 *)to)->sin6_family = AF_INET6;
*tolen = sizeof(struct sockaddr_in6);
auxaddr->ipv6_ifindex = pktinfo->ipi6_ifindex;
return r;
}
#endif
cmsgptr = CMSG_NXTHDR(&msg, cmsgptr);
}
}
/* No info about destination addr was available. */
*tolen = 0;
return r;
#endif
}
static int
send_to_from(int s, void *buf, size_t len, int flags,
const struct sockaddr *to, socklen_t tolen,
const struct sockaddr *from, socklen_t fromlen,
union aux_addressing_info *auxaddr)
{
#if (!defined(IP_PKTINFO) && !defined(IPV6_PKTINFO)) || !defined(CMSG_SPACE)
return sendto(s, buf, len, flags, to, tolen);
#else
struct iovec iov;
struct msghdr msg;
struct cmsghdr *cmsgptr;
char cbuf[CMSG_SPACE(sizeof(union pktinfo))];
if (from == 0 || fromlen == 0 || from->sa_family != to->sa_family) {
use_sendto:
return sendto(s, buf, len, flags, to, tolen);
}
iov.iov_base = buf;
iov.iov_len = len;
/* Truncation? */
if (iov.iov_len != len)
return EINVAL;
memset(cbuf, 0, sizeof(cbuf));
memset(&msg, 0, sizeof(msg));
msg.msg_name = (void *) to;
msg.msg_namelen = tolen;
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
msg.msg_control = cbuf;
/* CMSG_FIRSTHDR needs a non-zero controllen, or it'll return NULL
on Linux. */
msg.msg_controllen = sizeof(cbuf);
cmsgptr = CMSG_FIRSTHDR(&msg);
msg.msg_controllen = 0;
switch (from->sa_family) {
#if defined(IP_PKTINFO)
case AF_INET:
if (fromlen != sizeof(struct sockaddr_in))
goto use_sendto;
cmsgptr->cmsg_level = IPPROTO_IP;
cmsgptr->cmsg_type = IP_PKTINFO;
cmsgptr->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo));
{
struct in_pktinfo *p = (struct in_pktinfo *)CMSG_DATA(cmsgptr);
const struct sockaddr_in *from4 = (const struct sockaddr_in *)from;
p->ipi_spec_dst = from4->sin_addr;
}
msg.msg_controllen = CMSG_SPACE(sizeof(struct in_pktinfo));
break;
#endif
#if defined(KRB5_USE_INET6) && defined(IPV6_PKTINFO) && defined(HAVE_STRUCT_IN6_PKTINFO)
case AF_INET6:
if (fromlen != sizeof(struct sockaddr_in6))
goto use_sendto;
cmsgptr->cmsg_level = IPPROTO_IPV6;
cmsgptr->cmsg_type = IPV6_PKTINFO;
cmsgptr->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
{
struct in6_pktinfo *p = (struct in6_pktinfo *)CMSG_DATA(cmsgptr);
const struct sockaddr_in6 *from6 = (const struct sockaddr_in6 *)from;
p->ipi6_addr = from6->sin6_addr;
/* Because of the possibility of asymmetric routing, we
normally don't want to specify an interface. However,
Mac OS X doesn't like sending from a link-local address
(which can come up in testing at least, if you wind up
with a "foo.local" name) unless we do specify the
interface. */
if (IN6_IS_ADDR_LINKLOCAL(&from6->sin6_addr))
p->ipi6_ifindex = auxaddr->ipv6_ifindex;
/* otherwise, already zero */
}
msg.msg_controllen = CMSG_SPACE(sizeof(struct in6_pktinfo));
break;
#endif
default:
goto use_sendto;
}
return sendmsg(s, &msg, flags);
#endif
}
/* Dispatch routine for set/change password */
static krb5_error_code
dispatch(void *handle,
struct sockaddr *local_saddr, krb5_fulladdr *remote_faddr,
krb5_data *request, krb5_data **response)
{
krb5_error_code ret;
krb5_keytab kt = NULL;
kadm5_server_handle_t server_handle = (kadm5_server_handle_t)handle;
krb5_fulladdr local_faddr;
krb5_address **local_kaddrs = NULL, local_kaddr_buf;
*response = NULL;
if (local_saddr == NULL) {
ret = krb5_os_localaddr(server_handle->context, &local_kaddrs);
if (ret != 0)
goto cleanup;
local_faddr.address = local_kaddrs[0];
local_faddr.port = 0;
} else {
local_faddr.address = &local_kaddr_buf;
init_addr(&local_faddr, local_saddr);
}
ret = krb5_kt_resolve(server_handle->context, "KDB:", &kt);
if (ret != 0) {
krb5_klog_syslog(LOG_ERR, "chpw: Couldn't open admin keytab %s",
krb5_get_error_message(server_handle->context, ret));
goto cleanup;
}
*response = (krb5_data *)malloc(sizeof(krb5_data));
if (*response == NULL) {
ret = ENOMEM;
goto cleanup;
}
ret = process_chpw_request(server_handle->context,
handle,
server_handle->params.realm,
kt,
&local_faddr,
remote_faddr,
request,
*response);
cleanup:
if (local_kaddrs != NULL)
krb5_free_addresses(server_handle->context, local_kaddrs);
krb5_kt_close(server_handle->context, kt);
return ret;
}
static void process_packet(void *handle,
struct connection *conn, const char *prog,
int selflags)
{
int cc;
socklen_t saddr_len, daddr_len;
krb5_fulladdr faddr;
krb5_error_code retval;
struct sockaddr_storage saddr, daddr;
krb5_address addr;
krb5_data request;
krb5_data *response;
char pktbuf[MAX_DGRAM_SIZE];
int port_fd = conn->fd;
union aux_addressing_info auxaddr;
kadm5_server_handle_t server_handle = (kadm5_server_handle_t)handle;
response = NULL;
saddr_len = sizeof(saddr);
daddr_len = sizeof(daddr);
memset(&auxaddr, 0, sizeof(auxaddr));
cc = recv_from_to(port_fd, pktbuf, sizeof(pktbuf), 0,
(struct sockaddr *)&saddr, &saddr_len,
(struct sockaddr *)&daddr, &daddr_len,
&auxaddr);
if (cc == -1) {
if (errno != EINTR
/* This is how Linux indicates that a previous
transmission was refused, e.g., if the client timed out
before getting the response packet. */
&& errno != ECONNREFUSED
)
com_err(prog, errno, "while receiving from network");
return;
}
if (!cc)
return; /* zero-length packet? */
#if 0
if (daddr_len > 0) {
char addrbuf[100];
if (getnameinfo(ss2sa(&daddr), daddr_len, addrbuf, sizeof(addrbuf),
0, 0, NI_NUMERICHOST))
strlcpy(addrbuf, "?", sizeof(addrbuf));
com_err(prog, 0, "pktinfo says local addr is %s", addrbuf);
}
#endif
if (daddr_len == 0 && conn->type == CONN_UDP) {
/* If the PKTINFO option isn't set, this socket should be
bound to a specific local address. This info probably
should've been saved in our socket data structure at setup
time. */
daddr_len = sizeof(daddr);
if (getsockname(port_fd, (struct sockaddr *)&daddr, &daddr_len) != 0)
daddr_len = 0;
/* On failure, keep going anyways. */
}
request.length = cc;
request.data = pktbuf;
faddr.address = &addr;
init_addr(&faddr, ss2sa(&saddr));
/* this address is in net order */
if ((retval = dispatch(handle, ss2sa(&daddr), &faddr, &request, &response))) {
com_err(prog, retval, "while dispatching (udp)");
return;
}
if (response == NULL)
return;
cc = send_to_from(port_fd, response->data, (socklen_t) response->length, 0,
(struct sockaddr *)&saddr, saddr_len,
(struct sockaddr *)&daddr, daddr_len,
&auxaddr);
if (cc == -1) {
/* Note that the local address (daddr*) has no port number
info associated with it. */
char saddrbuf[NI_MAXHOST], sportbuf[NI_MAXSERV];
char daddrbuf[NI_MAXHOST];
int e = errno;
krb5_free_data(server_handle->context, response);
if (getnameinfo((struct sockaddr *)&daddr, daddr_len,
daddrbuf, sizeof(daddrbuf), 0, 0,
NI_NUMERICHOST) != 0) {
strlcpy(daddrbuf, "?", sizeof(daddrbuf));
}
if (getnameinfo((struct sockaddr *)&saddr, saddr_len,
saddrbuf, sizeof(saddrbuf), sportbuf, sizeof(sportbuf),
NI_NUMERICHOST|NI_NUMERICSERV) != 0) {
strlcpy(saddrbuf, "?", sizeof(saddrbuf));
strlcpy(sportbuf, "?", sizeof(sportbuf));
}
com_err(prog, e, "while sending reply to %s/%s from %s",
saddrbuf, sportbuf, daddrbuf);
return;
}
if (cc != response->length) {
com_err(prog, 0, "short reply write %d vs %d\n",
response->length, cc);
}
krb5_free_data(server_handle->context, response);
return;
}
static int tcp_or_rpc_data_counter;
static int max_tcp_or_rpc_data_connections = 45;
static void kill_tcp_or_rpc_connection(void *, struct connection *, int isForcedClose);
static int kill_lru_tcp_or_rpc_connection(void *handle, struct connection *newconn)
{
struct connection *oldest_tcp = NULL;
struct connection *c;
int i, fd = -1;
krb5_klog_syslog(LOG_INFO, "too many connections");
FOREACH_ELT (connections, i, c) {
if (c->type != CONN_TCP && c->type != CONN_RPC)
continue;
if (c == newconn)
continue;
#if 0
krb5_klog_syslog(LOG_INFO, "fd %d started at %ld", c->fd,
c->u.tcp.start_time);
#endif
if (oldest_tcp == NULL
|| oldest_tcp->u.tcp.start_time > c->u.tcp.start_time)
oldest_tcp = c;
}
if (oldest_tcp != NULL) {
krb5_klog_syslog(LOG_INFO, "dropping %s fd %d from %s",
c->type == CONN_RPC ? "rpc" : "tcp",
oldest_tcp->fd, oldest_tcp->u.tcp.addrbuf);
fd = oldest_tcp->fd;
kill_tcp_or_rpc_connection(handle, oldest_tcp, 1);
}
return fd;
}
static void accept_tcp_connection(void *handle,
struct connection *conn, const char *prog,
int selflags)
{
int s;
struct sockaddr_storage addr_s;
struct sockaddr *addr = (struct sockaddr *)&addr_s;
socklen_t addrlen = sizeof(addr_s);
struct socksetup sockdata;
struct connection *newconn;
char tmpbuf[10];
s = accept(conn->fd, addr, &addrlen);
if (s < 0)
return;
set_cloexec_fd(s);
#ifndef _WIN32
if (s >= FD_SETSIZE) {
close(s);
return;
}
#endif
setnbio(s), setnolinger(s), setkeepalive(s);
sockdata.prog = prog;
sockdata.retval = 0;
newconn = add_tcp_data_fd(&sockdata, s);
if (newconn == NULL)
return;
if (getnameinfo((struct sockaddr *)&addr_s, addrlen,
newconn->u.tcp.addrbuf, sizeof(newconn->u.tcp.addrbuf),
tmpbuf, sizeof(tmpbuf),
NI_NUMERICHOST | NI_NUMERICSERV))
strlcpy(newconn->u.tcp.addrbuf, "???", sizeof(newconn->u.tcp.addrbuf));
else {
char *p, *end;
p = newconn->u.tcp.addrbuf;
end = p + sizeof(newconn->u.tcp.addrbuf);
p += strlen(p);
if (end - p > 2 + strlen(tmpbuf)) {
*p++ = '.';
strlcpy(p, tmpbuf, end - p);
}
}
#if 0
krb5_klog_syslog(LOG_INFO, "accepted TCP connection on socket %d from %s",
s, newconn->u.tcp.addrbuf);
#endif
newconn->u.tcp.addr_s = addr_s;
newconn->u.tcp.addrlen = addrlen;
newconn->u.tcp.bufsiz = 1024 * 1024;
newconn->u.tcp.buffer = malloc(newconn->u.tcp.bufsiz);
newconn->u.tcp.start_time = time(0);
if (++tcp_or_rpc_data_counter > max_tcp_or_rpc_data_connections)
kill_lru_tcp_or_rpc_connection(handle, newconn);
if (newconn->u.tcp.buffer == 0) {
com_err(prog, errno, "allocating buffer for new TCP session from %s",
newconn->u.tcp.addrbuf);
delete_fd(newconn);
close(s);
tcp_or_rpc_data_counter--;
return;
}
newconn->u.tcp.offset = 0;
newconn->u.tcp.faddr.address = &newconn->u.tcp.kaddr;
init_addr(&newconn->u.tcp.faddr, ss2sa(&newconn->u.tcp.addr_s));
SG_SET(&newconn->u.tcp.sgbuf[0], newconn->u.tcp.lenbuf, 4);
SG_SET(&newconn->u.tcp.sgbuf[1], 0, 0);
FD_SET(s, &sstate.rfds);
if (sstate.max <= s)
sstate.max = s + 1;
}
static void
kill_tcp_or_rpc_connection(void *handle, struct connection *conn, int isForcedClose)
{
kadm5_server_handle_t server_handle = (kadm5_server_handle_t)handle;
assert(conn->type == CONN_TCP || conn->type == CONN_RPC);
assert(conn->fd != -1);
if (conn->u.tcp.response)
krb5_free_data(server_handle->context, conn->u.tcp.response);
if (conn->u.tcp.buffer)
free(conn->u.tcp.buffer);
FD_CLR(conn->fd, &sstate.rfds);
FD_CLR(conn->fd, &sstate.wfds);
if (sstate.max == conn->fd + 1)
while (sstate.max > 0
&& ! FD_ISSET(sstate.max-1, &sstate.rfds)
&& ! FD_ISSET(sstate.max-1, &sstate.wfds)
/* && ! FD_ISSET(sstate.max-1, &sstate.xfds) */
)
sstate.max--;
/* In the non-forced case, the RPC runtime will close the descriptor for us */
if (conn->type == CONN_TCP || isForcedClose) {
close(conn->fd);
}
/* For RPC connections, call into RPC runtime to flush out any internal state */
if (conn->type == CONN_RPC && isForcedClose) {
fd_set fds;
FD_ZERO(&fds);
FD_SET(conn->fd, &fds);
svc_getreqset(&fds);
if (FD_ISSET(conn->fd, &svc_fdset)) {
krb5_klog_syslog(LOG_ERR,
"descriptor %d closed but still in svc_fdset", conn->fd);
}
}
conn->fd = -1;
delete_fd(conn);
tcp_or_rpc_data_counter--;
}
static krb5_error_code
make_toolong_error (void *handle, krb5_data **out)
{
krb5_error errpkt;
krb5_error_code retval;
krb5_data *scratch;
kadm5_server_handle_t server_handle = (kadm5_server_handle_t)handle;
retval = krb5_us_timeofday(server_handle->context, &errpkt.stime, &errpkt.susec);
if (retval)
return retval;
errpkt.error = KRB_ERR_FIELD_TOOLONG;
retval = krb5_build_principal(server_handle->context, &errpkt.server,
strlen(server_handle->params.realm),
server_handle->params.realm,
"kadmin", "changepw", NULL);
if (retval)
return retval;
errpkt.client = NULL;
errpkt.cusec = 0;
errpkt.ctime = 0;
errpkt.text.length = 0;
errpkt.text.data = 0;
errpkt.e_data.length = 0;
errpkt.e_data.data = 0;
scratch = malloc(sizeof(*scratch));
if (scratch == NULL)
return ENOMEM;
retval = krb5_mk_error(server_handle->context, &errpkt, scratch);
if (retval) {
free(scratch);
return retval;
}
*out = scratch;
return 0;
}
static void
queue_tcp_outgoing_response(struct connection *conn)
{
store_32_be(conn->u.tcp.response->length, conn->u.tcp.lenbuf);
SG_SET(&conn->u.tcp.sgbuf[1], conn->u.tcp.response->data,
conn->u.tcp.response->length);
conn->u.tcp.sgp = conn->u.tcp.sgbuf;
conn->u.tcp.sgnum = 2;
FD_SET(conn->fd, &sstate.wfds);
}
static void
process_tcp_connection(void *handle,
struct connection *conn, const char *prog, int selflags)
{
int isForcedClose = 1; /* not used now, but for completeness */
if (selflags & SSF_WRITE) {
ssize_t nwrote;
SOCKET_WRITEV_TEMP tmp;
nwrote = SOCKET_WRITEV(conn->fd, conn->u.tcp.sgp, conn->u.tcp.sgnum,
tmp);
if (nwrote < 0) {
goto kill_tcp_connection;
}
if (nwrote == 0) {
/* eof */
isForcedClose = 0;
goto kill_tcp_connection;
}
while (nwrote) {
sg_buf *sgp = conn->u.tcp.sgp;
if (nwrote < SG_LEN(sgp)) {
SG_ADVANCE(sgp, nwrote);
nwrote = 0;
} else {
nwrote -= SG_LEN(sgp);
conn->u.tcp.sgp++;
conn->u.tcp.sgnum--;
if (conn->u.tcp.sgnum == 0 && nwrote != 0)
abort();
}
}
if (conn->u.tcp.sgnum == 0) {
/* finished sending */
/* We should go back to reading, though if we sent a
FIELD_TOOLONG error in reply to a length with the high
bit set, RFC 4120 says we have to close the TCP
stream. */
isForcedClose = 0;
goto kill_tcp_connection;
}
} else if (selflags & SSF_READ) {
/* Read message length and data into one big buffer, already
allocated at connect time. If we have a complete message,
we stop reading, so we should only be here if there is no
data in the buffer, or only an incomplete message. */
size_t len;
ssize_t nread;
if (conn->u.tcp.offset < 4) {
/* msglen has not been computed */
/* XXX Doing at least two reads here, letting the kernel
worry about buffering. It'll be faster when we add
code to manage the buffer here. */
len = 4 - conn->u.tcp.offset;
nread = SOCKET_READ(conn->fd,
conn->u.tcp.buffer + conn->u.tcp.offset, len);
if (nread < 0)
/* error */
goto kill_tcp_connection;
if (nread == 0)
/* eof */
goto kill_tcp_connection;
conn->u.tcp.offset += nread;
if (conn->u.tcp.offset == 4) {
unsigned char *p = (unsigned char *)conn->u.tcp.buffer;
conn->u.tcp.msglen = load_32_be(p);
if (conn->u.tcp.msglen > conn->u.tcp.bufsiz - 4) {
krb5_error_code err;
/* message too big */
krb5_klog_syslog(LOG_ERR, "TCP client %s wants %lu bytes, cap is %lu",
conn->u.tcp.addrbuf, (unsigned long) conn->u.tcp.msglen,
(unsigned long) conn->u.tcp.bufsiz - 4);
/* XXX Should return an error. */
err = make_toolong_error (handle, &conn->u.tcp.response);
if (err) {
krb5_klog_syslog(LOG_ERR,
"error constructing KRB_ERR_FIELD_TOOLONG error! %s",
error_message(err));
goto kill_tcp_connection;
}
goto have_response;
}
}
} else {
/* msglen known */
krb5_data request;
krb5_error_code err;
struct sockaddr_storage local_saddr;
socklen_t local_saddrlen = sizeof(local_saddr);
struct sockaddr *local_saddrp = NULL;
len = conn->u.tcp.msglen - (conn->u.tcp.offset - 4);
nread = SOCKET_READ(conn->fd,
conn->u.tcp.buffer + conn->u.tcp.offset, len);
if (nread < 0)
/* error */
goto kill_tcp_connection;
if (nread == 0)
/* eof */
goto kill_tcp_connection;
conn->u.tcp.offset += nread;
if (conn->u.tcp.offset < conn->u.tcp.msglen + 4)
return;
/* have a complete message, and exactly one message */
request.length = conn->u.tcp.msglen;
request.data = conn->u.tcp.buffer + 4;
if (getsockname(conn->fd, ss2sa(&local_saddr), &local_saddrlen) == 0) {
local_saddrp = ss2sa(&local_saddr);
}
err = dispatch(handle, local_saddrp, &conn->u.tcp.faddr,
&request, &conn->u.tcp.response);
if (err) {
com_err(prog, err, "while dispatching (tcp)");
goto kill_tcp_connection;
}
have_response:
queue_tcp_outgoing_response(conn);
FD_CLR(conn->fd, &sstate.rfds);
}
} else
abort();
return;
kill_tcp_connection:
kill_tcp_or_rpc_connection(handle, conn, isForcedClose);
}
static void service_conn(void *handle,
struct connection *conn, const char *prog,
int selflags)
{
conn->service(handle, conn, prog, selflags);
}
static int getcurtime(struct timeval *tvp)
{
#ifdef _WIN32
struct _timeb tb;
_ftime(&tb);
tvp->tv_sec = tb.time;
tvp->tv_usec = tb.millitm * 1000;
return 0;
#else
return gettimeofday(tvp, 0) ? errno : 0;
#endif
}
krb5_error_code
listen_and_process(void *handle, const char *prog)
{
int nfound;
/* This struct contains 3 fd_set objects; on some platforms, they
can be rather large. Making this static avoids putting all
that junk on the stack. */
static struct select_state sout;
int i, sret, netchanged = 0;
krb5_error_code err;
kadm5_server_handle_t server_handle = (kadm5_server_handle_t)handle;
if (conns == (struct connection **) NULL)
return KDC5_NONET;
while (!signal_request_exit) {
if (signal_request_hup) {
krb5_klog_reopen(server_handle->context);
reset_db();
signal_request_hup = 0;
}
#ifdef PURIFY
if (signal_pure_report) {
purify_new_reports();
signal_pure_report = 0;
}
if (signal_pure_clear) {
purify_clear_new_reports();
signal_pure_clear = 0;
}
#endif /* PURIFY */
if (network_reconfiguration_needed) {
krb5_klog_syslog(LOG_INFO, "network reconfiguration needed");
/* It might be tidier to add a timer-callback interface to
the control loop here, but for this one use, it's not a
big deal. */
err = getcurtime(&sstate.end_time);
if (err) {
com_err(prog, err, "while getting the time");
continue;
}
sstate.end_time.tv_sec += 3;
netchanged = 1;
} else
sstate.end_time.tv_sec = sstate.end_time.tv_usec = 0;
err = krb5int_cm_call_select(&sstate, &sout, &sret);
if (err) {
if (err != EINTR)
com_err(prog, err, "while selecting for network input(1)");
continue;
}
if (sret == 0 && netchanged) {
network_reconfiguration_needed = 0;
closedown_network(handle, prog);
err = setup_network(handle, prog);
if (err) {
com_err(prog, err, "while reinitializing network");
return err;
}
netchanged = 0;
}
if (sret == -1) {
if (errno != EINTR)
com_err(prog, errno, "while selecting for network input(2)");
continue;
}
nfound = sret;
for (i=0; i<n_sockets && nfound > 0; i++) {
int sflags = 0;
if (conns[i]->fd < 0)
abort();
if (FD_ISSET(conns[i]->fd, &sout.rfds))
sflags |= SSF_READ, nfound--;
if (FD_ISSET(conns[i]->fd, &sout.wfds))
sflags |= SSF_WRITE, nfound--;
if (sflags)
service_conn(handle, conns[i], prog, sflags);
}
}
krb5_klog_syslog(LOG_INFO, "shutdown signal received");
return 0;
}
krb5_error_code
closedown_network(void *handle, const char *prog)
{
int i;
struct connection *conn;
if (conns == (struct connection **) NULL)
return KDC5_NONET;
FOREACH_ELT (connections, i, conn) {
if (conn->fd >= 0) {
krb5_klog_syslog(LOG_INFO, "closing down fd %d", conn->fd);
(void) close(conn->fd);
if (conn->type == CONN_RPC) {
fd_set fds;
FD_ZERO(&fds);
FD_SET(conn->fd, &fds);
svc_getreqset(&fds);
}
}
if (conn->type == CONN_RPC_LISTENER) {
if (conn->u.rpc.transp != NULL)
svc_destroy(conn->u.rpc.transp);
}
DEL (connections, i);
/* There may also be per-connection data in the tcp structure
(tcp.buffer, tcp.response) that we're not freeing here.
That should only happen if we quit with a connection in
progress. */
free(conn);
}
FREE_SET_DATA(connections);
FREE_SET_DATA(udp_port_data);
FREE_SET_DATA(tcp_port_data);
FREE_SET_DATA(rpc_svc_data);
return 0;
}
static void accept_rpc_connection(void *handle, struct connection *conn,
const char *prog, int selflags)
{
struct socksetup sockdata;
fd_set fds;
register int s;
assert(selflags & SSF_READ);
if ((selflags & SSF_READ) == 0)
return;
sockdata.prog = prog;
sockdata.retval = 0;
/*
* Service the woken RPC listener descriptor.
*/
FD_ZERO(&fds);
FD_SET(conn->fd, &fds);
svc_getreqset(&fds);
/*
* Scan svc_fdset for any new connections.
*/
for (s = 0; s < FD_SETSIZE; s++) {
/* sstate.rfds |= svc_fdset & ~(rpc_listenfds | sstate.rfds) */
if (FD_ISSET(s, &svc_fdset)
&& !FD_ISSET(s, &rpc_listenfds)
&& !FD_ISSET(s, &sstate.rfds))
{
struct connection *newconn;
struct sockaddr_storage addr_s;
struct sockaddr *addr = (struct sockaddr *)&addr_s;
socklen_t addrlen = sizeof(addr_s);
char tmpbuf[10];
newconn = add_rpc_data_fd(&sockdata, s);
if (newconn == NULL)
continue;
set_cloexec_fd(s);
#if 0
setnbio(s), setnolinger(s), setkeepalive(s);
#endif
if (getpeername(s, addr, &addrlen) ||
getnameinfo(addr, addrlen,
newconn->u.tcp.addrbuf, sizeof(newconn->u.tcp.addrbuf),
tmpbuf, sizeof(tmpbuf),
NI_NUMERICHOST | NI_NUMERICSERV))
strlcpy(newconn->u.tcp.addrbuf, "???", sizeof(newconn->u.tcp.addrbuf));
else {
char *p, *end;
p = newconn->u.tcp.addrbuf;
end = p + sizeof(newconn->u.tcp.addrbuf);
p += strlen(p);
if (end - p > 2 + strlen(tmpbuf)) {
*p++ = '.';
strlcpy(p, tmpbuf, end - p);
}
}
#if 0
krb5_klog_syslog(LOG_INFO, "accepted RPC connection on socket %d from %s",
s, newconn->u.tcp.addrbuf);
#endif
newconn->u.tcp.addr_s = addr_s;
newconn->u.tcp.addrlen = addrlen;
newconn->u.tcp.start_time = time(0);
if (++tcp_or_rpc_data_counter > max_tcp_or_rpc_data_connections)
kill_lru_tcp_or_rpc_connection(handle, newconn);
newconn->u.tcp.faddr.address = &newconn->u.tcp.kaddr;
init_addr(&newconn->u.tcp.faddr, ss2sa(&newconn->u.tcp.addr_s));
FD_SET(s, &sstate.rfds);
if (sstate.max <= s)
sstate.max = s + 1;
}
}
}
static void process_rpc_connection(void *handle, struct connection *conn,
const char *prog, int selflags)
{
fd_set fds;
assert(selflags & SSF_READ);
if ((selflags & SSF_READ) == 0)
return;
FD_ZERO(&fds);
FD_SET(conn->fd, &fds);
svc_getreqset(&fds);
if (!FD_ISSET(conn->fd, &svc_fdset))
kill_tcp_or_rpc_connection(handle, conn, 0);
}
#endif /* INET */
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