803 lines
18 KiB
C
803 lines
18 KiB
C
/*
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* Copyright (c) 1997-2000 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "kdc_locl.h"
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RCSID("$Id: connect.c,v 1.80 2000/10/08 21:36:29 assar Exp $");
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/*
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* a tuple describing on what to listen
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*/
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struct port_desc{
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int family;
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int type;
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int port;
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};
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/* the current ones */
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static struct port_desc *ports;
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static int num_ports;
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/*
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* add `family, port, protocol' to the list with duplicate suppresion.
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*/
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static void
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add_port(int family, int port, const char *protocol)
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{
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int type;
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int i;
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if(strcmp(protocol, "udp") == 0)
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type = SOCK_DGRAM;
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else if(strcmp(protocol, "tcp") == 0)
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type = SOCK_STREAM;
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else
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return;
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for(i = 0; i < num_ports; i++){
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if(ports[i].type == type
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&& ports[i].port == port
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&& ports[i].family == family)
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return;
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}
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ports = realloc(ports, (num_ports + 1) * sizeof(*ports));
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if (ports == NULL)
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krb5_err (context, 1, errno, "realloc");
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ports[num_ports].family = family;
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ports[num_ports].type = type;
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ports[num_ports].port = port;
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num_ports++;
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}
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/*
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* add a triple but with service -> port lookup
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* (this prints warnings for stuff that does not exist)
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*/
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static void
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add_port_service(int family, const char *service, int port,
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const char *protocol)
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{
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port = krb5_getportbyname (context, service, protocol, port);
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add_port (family, port, protocol);
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}
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/*
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* add the port with service -> port lookup or string -> number
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* (no warning is printed)
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*/
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static void
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add_port_string (int family, const char *port_str, const char *protocol)
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{
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struct servent *sp;
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int port;
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sp = roken_getservbyname (port_str, protocol);
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if (sp != NULL) {
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port = sp->s_port;
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} else {
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char *end;
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port = htons(strtol(port_str, &end, 0));
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if (end == port_str)
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return;
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}
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add_port (family, port, protocol);
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}
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/*
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* add the standard collection of ports for `family'
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*/
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static void
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add_standard_ports (int family)
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{
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add_port_service(family, "kerberos", 88, "udp");
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add_port_service(family, "kerberos", 88, "tcp");
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add_port_service(family, "kerberos-sec", 88, "udp");
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add_port_service(family, "kerberos-sec", 88, "tcp");
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if(enable_http)
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add_port_service(family, "http", 80, "tcp");
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#ifdef KRB4
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if(enable_v4) {
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add_port_service(family, "kerberos-iv", 750, "udp");
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add_port_service(family, "kerberos-iv", 750, "tcp");
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}
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if(enable_524) {
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add_port_service(family, "krb524", 4444, "udp");
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add_port_service(family, "krb524", 4444, "tcp");
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}
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#endif
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#ifdef KASERVER
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if (enable_kaserver)
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add_port_service(family, "afs3-kaserver", 7004, "udp");
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#endif
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}
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/*
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* parse the set of space-delimited ports in `str' and add them.
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* "+" => all the standard ones
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* otherwise it's port|service[/protocol]
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*/
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static void
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parse_ports(const char *str)
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{
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char *pos = NULL;
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char *p;
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char *str_copy = strdup (str);
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p = strtok_r(str_copy, " \t", &pos);
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while(p != NULL) {
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if(strcmp(p, "+") == 0) {
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#ifdef HAVE_IPV6
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add_standard_ports(AF_INET6);
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#endif
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add_standard_ports(AF_INET);
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} else {
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char *q = strchr(p, '/');
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if(q){
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*q++ = 0;
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#ifdef HAVE_IPV6
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add_port_string(AF_INET6, p, q);
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#endif
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add_port_string(AF_INET, p, q);
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}else {
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#ifdef HAVE_IPV6
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add_port_string(AF_INET6, p, "udp");
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add_port_string(AF_INET6, p, "tcp");
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#endif
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add_port_string(AF_INET, p, "udp");
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add_port_string(AF_INET, p, "tcp");
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}
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}
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p = strtok_r(NULL, " \t", &pos);
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}
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free (str_copy);
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}
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/*
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* every socket we listen on
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*/
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struct descr {
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int s;
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int type;
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unsigned char *buf;
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size_t size;
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size_t len;
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time_t timeout;
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struct sockaddr_storage __ss;
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struct sockaddr *sa;
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socklen_t sock_len;
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char addr_string[128];
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};
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static void
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init_descr(struct descr *d)
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{
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memset(d, 0, sizeof(*d));
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d->sa = (struct sockaddr *)&d->__ss;
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d->s = -1;
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}
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/*
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* re-intialize all `n' ->sa in `d'.
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*/
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static void
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reinit_descrs (struct descr *d, int n)
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{
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int i;
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for (i = 0; i < n; ++i)
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d[i].sa = (struct sockaddr *)&d[i].__ss;
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}
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/*
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* Create the socket (family, type, port) in `d'
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*/
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static void
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init_socket(struct descr *d, krb5_address *a, int family, int type, int port)
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{
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krb5_error_code ret;
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struct sockaddr_storage __ss;
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struct sockaddr *sa = (struct sockaddr *)&__ss;
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int sa_size;
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init_descr (d);
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ret = krb5_addr2sockaddr (a, sa, &sa_size, port);
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if (ret) {
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krb5_warn(context, ret, "krb5_addr2sockaddr");
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close(d->s);
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d->s = -1;
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return;
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}
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if (sa->sa_family != family)
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return;
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d->s = socket(family, type, 0);
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if(d->s < 0){
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krb5_warn(context, errno, "socket(%d, %d, 0)", family, type);
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d->s = -1;
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return;
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}
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#if defined(HAVE_SETSOCKOPT) && defined(SOL_SOCKET) && defined(SO_REUSEADDR)
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{
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int one = 1;
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setsockopt(d->s, SOL_SOCKET, SO_REUSEADDR, (void *)&one, sizeof(one));
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}
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#endif
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d->type = type;
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if(bind(d->s, sa, sa_size) < 0){
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char a_str[256];
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size_t len;
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krb5_print_address (a, a_str, sizeof(a_str), &len);
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krb5_warn(context, errno, "bind %s/%d", a_str, ntohs(port));
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close(d->s);
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d->s = -1;
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return;
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}
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if(type == SOCK_STREAM && listen(d->s, SOMAXCONN) < 0){
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char a_str[256];
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size_t len;
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krb5_print_address (a, a_str, sizeof(a_str), &len);
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krb5_warn(context, errno, "listen %s/%d", a_str, ntohs(port));
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close(d->s);
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d->s = -1;
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return;
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}
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}
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/*
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* Allocate descriptors for all the sockets that we should listen on
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* and return the number of them.
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*/
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static int
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init_sockets(struct descr **desc)
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{
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krb5_error_code ret;
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int i, j;
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struct descr *d;
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int num = 0;
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krb5_addresses addresses;
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if (explicit_addresses.len) {
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addresses = explicit_addresses;
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} else {
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ret = krb5_get_all_server_addrs (context, &addresses);
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if (ret)
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krb5_err (context, 1, ret, "krb5_get_all_server_addrs");
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}
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parse_ports(port_str);
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d = malloc(addresses.len * num_ports * sizeof(*d));
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if (d == NULL)
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krb5_errx(context, 1, "malloc(%lu) failed",
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(unsigned long)num_ports * sizeof(*d));
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for (i = 0; i < num_ports; i++){
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for (j = 0; j < addresses.len; ++j) {
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init_socket(&d[num], &addresses.val[j],
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ports[i].family, ports[i].type, ports[i].port);
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if(d[num].s != -1){
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char a_str[80];
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size_t len;
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krb5_print_address (&addresses.val[j], a_str,
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sizeof(a_str), &len);
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kdc_log(5, "listening on %s port %u/%s",
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a_str,
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ntohs(ports[i].port),
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(ports[i].type == SOCK_STREAM) ? "tcp" : "udp");
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/* XXX */
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num++;
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}
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}
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}
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krb5_free_addresses (context, &addresses);
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d = realloc(d, num * sizeof(*d));
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if (d == NULL && num != 0)
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krb5_errx(context, 1, "realloc(%lu) failed",
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(unsigned long)num * sizeof(*d));
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reinit_descrs (d, num);
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*desc = d;
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return num;
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}
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/*
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* handle the request in `buf, len', from `addr' (or `from' as a string),
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* sending a reply in `reply'.
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*/
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static int
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process_request(unsigned char *buf,
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size_t len,
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krb5_data *reply,
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int *sendlength,
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const char *from,
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struct sockaddr *addr)
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{
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KDC_REQ req;
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#ifdef KRB4
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Ticket ticket;
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#endif
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krb5_error_code ret;
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size_t i;
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gettimeofday(&now, NULL);
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if(decode_AS_REQ(buf, len, &req, &i) == 0){
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ret = as_rep(&req, reply, from, addr);
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free_AS_REQ(&req);
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return ret;
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}else if(decode_TGS_REQ(buf, len, &req, &i) == 0){
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ret = tgs_rep(&req, reply, from, addr);
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free_TGS_REQ(&req);
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return ret;
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}
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#ifdef KRB4
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else if(maybe_version4(buf, len)){
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*sendlength = 0; /* elbitapmoc sdrawkcab XXX */
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do_version4(buf, len, reply, from, (struct sockaddr_in*)addr);
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return 0;
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}else if(decode_Ticket(buf, len, &ticket, &i) == 0){
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ret = do_524(&ticket, reply, from, addr);
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free_Ticket(&ticket);
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return ret;
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}
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#endif
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#ifdef KASERVER
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else if (enable_kaserver) {
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ret = do_kaserver (buf, len, reply, from, (struct sockaddr_in*)addr);
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return ret;
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}
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#endif
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return -1;
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}
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static void
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addr_to_string(struct sockaddr *addr, size_t addr_len, char *str, size_t len)
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{
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krb5_address a;
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krb5_sockaddr2address(addr, &a);
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if(krb5_print_address(&a, str, len, &len) == 0) {
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krb5_free_address(context, &a);
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return;
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}
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krb5_free_address(context, &a);
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snprintf(str, len, "<family=%d>", addr->sa_family);
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}
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/*
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* Handle the request in `buf, len' to socket `d'
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*/
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static void
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do_request(void *buf, size_t len, int sendlength,
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struct descr *d)
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{
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krb5_error_code ret;
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krb5_data reply;
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reply.length = 0;
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ret = process_request(buf, len, &reply, &sendlength,
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d->addr_string, d->sa);
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if(reply.length){
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kdc_log(5, "sending %d bytes to %s", reply.length, d->addr_string);
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if(sendlength){
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unsigned char len[4];
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len[0] = (reply.length >> 24) & 0xff;
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len[1] = (reply.length >> 16) & 0xff;
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len[2] = (reply.length >> 8) & 0xff;
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len[3] = reply.length & 0xff;
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if(sendto(d->s, len, sizeof(len), 0, d->sa, d->sock_len) < 0) {
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kdc_log (0, "sendto(%s): %s", d->addr_string, strerror(errno));
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krb5_data_free(&reply);
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return;
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}
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}
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if(sendto(d->s, reply.data, reply.length, 0, d->sa, d->sock_len) < 0) {
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kdc_log (0, "sendto(%s): %s", d->addr_string, strerror(errno));
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krb5_data_free(&reply);
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return;
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}
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krb5_data_free(&reply);
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}
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if(ret)
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kdc_log(0, "Failed processing %lu byte request from %s",
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(unsigned long)len, d->addr_string);
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}
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/*
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* Handle incoming data to the UDP socket in `d'
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*/
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static void
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handle_udp(struct descr *d)
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{
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unsigned char *buf;
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int n;
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buf = malloc(max_request);
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if(buf == NULL){
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kdc_log(0, "Failed to allocate %u bytes", max_request);
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return;
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}
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d->sock_len = sizeof(d->__ss);
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n = recvfrom(d->s, buf, max_request, 0, d->sa, &d->sock_len);
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if(n < 0)
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krb5_warn(context, errno, "recvfrom");
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else {
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addr_to_string (d->sa, d->sock_len,
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d->addr_string, sizeof(d->addr_string));
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do_request(buf, n, 0, d);
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}
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free (buf);
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}
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static void
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clear_descr(struct descr *d)
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{
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if(d->buf)
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memset(d->buf, 0, d->size);
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d->len = 0;
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if(d->s != -1)
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close(d->s);
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d->s = -1;
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}
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/* remove HTTP %-quoting from buf */
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static int
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de_http(char *buf)
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{
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char *p, *q;
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for(p = q = buf; *p; p++, q++) {
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if(*p == '%') {
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unsigned int x;
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if(sscanf(p + 1, "%2x", &x) != 1)
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return -1;
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*q = x;
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p += 2;
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} else
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*q = *p;
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}
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*q = '\0';
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return 0;
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}
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#define TCP_TIMEOUT 4
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/*
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* accept a new TCP connection on `d[parent]' and store it in `d[child]'
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*/
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static void
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add_new_tcp (struct descr *d, int parent, int child)
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{
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int s;
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if (child == -1)
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return;
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d[child].sock_len = sizeof(d[child].__ss);
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s = accept(d[parent].s, d[child].sa, &d[child].sock_len);
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if(s < 0) {
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krb5_warn(context, errno, "accept");
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return;
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}
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if (s >= FD_SETSIZE) {
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krb5_warnx(context, "socket FD too large");
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close (s);
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return;
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}
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d[child].s = s;
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|
d[child].timeout = time(NULL) + TCP_TIMEOUT;
|
|
d[child].type = SOCK_STREAM;
|
|
addr_to_string (d[child].sa, d[child].sock_len,
|
|
d[child].addr_string, sizeof(d[child].addr_string));
|
|
}
|
|
|
|
/*
|
|
* Grow `d' to handle at least `n'.
|
|
* Return != 0 if fails
|
|
*/
|
|
|
|
static int
|
|
grow_descr (struct descr *d, size_t n)
|
|
{
|
|
if (d->size - d->len < n) {
|
|
unsigned char *tmp;
|
|
|
|
d->size += max(1024, d->len + n);
|
|
if (d->size >= max_request) {
|
|
kdc_log(0, "Request exceeds max request size (%u bytes).",
|
|
d->size);
|
|
clear_descr(d);
|
|
return -1;
|
|
}
|
|
tmp = realloc (d->buf, d->size);
|
|
if (tmp == NULL) {
|
|
kdc_log(0, "Failed to re-allocate %u bytes.", d->size);
|
|
clear_descr(d);
|
|
return -1;
|
|
}
|
|
d->buf = tmp;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Try to handle the TCP data at `d->buf, d->len'.
|
|
* Return -1 if failed, 0 if succesful, and 1 if data is complete.
|
|
*/
|
|
|
|
static int
|
|
handle_vanilla_tcp (struct descr *d)
|
|
{
|
|
krb5_storage *sp;
|
|
int32_t len;
|
|
|
|
sp = krb5_storage_from_mem(d->buf, d->len);
|
|
if (sp == NULL) {
|
|
kdc_log (0, "krb5_storage_from_mem failed");
|
|
return -1;
|
|
}
|
|
krb5_ret_int32(sp, &len);
|
|
krb5_storage_free(sp);
|
|
if(d->len - 4 >= len) {
|
|
memmove(d->buf, d->buf + 4, d->len - 4);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Try to handle the TCP/HTTP data at `d->buf, d->len'.
|
|
* Return -1 if failed, 0 if succesful, and 1 if data is complete.
|
|
*/
|
|
|
|
static int
|
|
handle_http_tcp (struct descr *d)
|
|
{
|
|
char *s, *p, *t;
|
|
void *data;
|
|
char *proto;
|
|
int len;
|
|
|
|
s = (char *)d->buf;
|
|
|
|
p = strstr(s, "\r\n");
|
|
if (p == NULL) {
|
|
kdc_log(0, "Malformed HTTP request from %s", d->addr_string);
|
|
return -1;
|
|
}
|
|
*p = 0;
|
|
|
|
p = NULL;
|
|
t = strtok_r(s, " \t", &p);
|
|
if (t == NULL) {
|
|
kdc_log(0, "Malformed HTTP request from %s", d->addr_string);
|
|
return -1;
|
|
}
|
|
t = strtok_r(NULL, " \t", &p);
|
|
if(t == NULL) {
|
|
kdc_log(0, "Malformed HTTP request from %s", d->addr_string);
|
|
return -1;
|
|
}
|
|
data = malloc(strlen(t));
|
|
if (data == NULL) {
|
|
kdc_log(0, "Failed to allocate %u bytes", strlen(t));
|
|
return -1;
|
|
}
|
|
if(*t == '/')
|
|
t++;
|
|
if(de_http(t) != 0) {
|
|
kdc_log(0, "Malformed HTTP request from %s", d->addr_string);
|
|
kdc_log(5, "Request: %s", t);
|
|
free(data);
|
|
return -1;
|
|
}
|
|
proto = strtok_r(NULL, " \t", &p);
|
|
if (proto == NULL) {
|
|
kdc_log(0, "Malformed HTTP request from %s", d->addr_string);
|
|
free(data);
|
|
return -1;
|
|
}
|
|
len = base64_decode(t, data);
|
|
if(len <= 0){
|
|
const char *msg =
|
|
" 404 Not found\r\n"
|
|
"Server: Heimdal/" VERSION "\r\n"
|
|
"Content-type: text/html\r\n"
|
|
"Content-transfer-encoding: 8bit\r\n\r\n"
|
|
"<TITLE>404 Not found</TITLE>\r\n"
|
|
"<H1>404 Not found</H1>\r\n"
|
|
"That page doesn't exist, maybe you are looking for "
|
|
"<A HREF=\"http://www.pdc.kth.se/heimdal\">Heimdal</A>?\r\n";
|
|
write(d->s, proto, strlen(proto));
|
|
write(d->s, msg, strlen(msg));
|
|
kdc_log(0, "HTTP request from %s is non KDC request", d->addr_string);
|
|
kdc_log(5, "Request: %s", t);
|
|
free(data);
|
|
return -1;
|
|
}
|
|
{
|
|
const char *msg =
|
|
" 200 OK\r\n"
|
|
"Server: Heimdal/" VERSION "\r\n"
|
|
"Content-type: application/octet-stream\r\n"
|
|
"Content-transfer-encoding: binary\r\n\r\n";
|
|
write(d->s, proto, strlen(proto));
|
|
write(d->s, msg, strlen(msg));
|
|
}
|
|
memcpy(d->buf, data, len);
|
|
d->len = len;
|
|
free(data);
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Handle incoming data to the TCP socket in `d[index]'
|
|
*/
|
|
|
|
static void
|
|
handle_tcp(struct descr *d, int index, int min_free)
|
|
{
|
|
unsigned char buf[1024];
|
|
int n;
|
|
int ret = 0;
|
|
|
|
if (d[index].timeout == 0) {
|
|
add_new_tcp (d, index, min_free);
|
|
return;
|
|
}
|
|
|
|
n = recvfrom(d[index].s, buf, sizeof(buf), 0, NULL, NULL);
|
|
if(n < 0){
|
|
krb5_warn(context, errno, "recvfrom");
|
|
return;
|
|
}
|
|
if (grow_descr (&d[index], n))
|
|
return;
|
|
memcpy(d[index].buf + d[index].len, buf, n);
|
|
d[index].len += n;
|
|
if(d[index].len > 4 && d[index].buf[0] == 0) {
|
|
ret = handle_vanilla_tcp (&d[index]);
|
|
} else if(enable_http &&
|
|
d[index].len >= 4 &&
|
|
strncmp((char *)d[index].buf, "GET ", 4) == 0 &&
|
|
strncmp((char *)d[index].buf + d[index].len - 4,
|
|
"\r\n\r\n", 4) == 0) {
|
|
ret = handle_http_tcp (&d[index]);
|
|
if (ret < 0)
|
|
clear_descr (d + index);
|
|
} else if (d[index].len > 4) {
|
|
kdc_log (0, "TCP data of strange type from %s", d[index].addr_string);
|
|
return;
|
|
}
|
|
if (ret < 0)
|
|
return;
|
|
else if (ret == 1) {
|
|
do_request(d[index].buf, d[index].len, 1, &d[index]);
|
|
clear_descr(d + index);
|
|
}
|
|
}
|
|
|
|
void
|
|
loop(void)
|
|
{
|
|
struct descr *d;
|
|
int ndescr;
|
|
|
|
ndescr = init_sockets(&d);
|
|
if(ndescr <= 0)
|
|
krb5_errx(context, 1, "No sockets!");
|
|
while(exit_flag == 0){
|
|
struct timeval tmout;
|
|
fd_set fds;
|
|
int min_free = -1;
|
|
int max_fd = 0;
|
|
int i;
|
|
|
|
FD_ZERO(&fds);
|
|
for(i = 0; i < ndescr; i++) {
|
|
if(d[i].s >= 0){
|
|
if(d[i].type == SOCK_STREAM &&
|
|
d[i].timeout && d[i].timeout < time(NULL)) {
|
|
kdc_log(1, "TCP-connection from %s expired after %u bytes",
|
|
d[i].addr_string, d[i].len);
|
|
clear_descr(&d[i]);
|
|
continue;
|
|
}
|
|
if(max_fd < d[i].s)
|
|
max_fd = d[i].s;
|
|
if (max_fd >= FD_SETSIZE)
|
|
krb5_errx(context, 1, "fd too large");
|
|
FD_SET(d[i].s, &fds);
|
|
} else if(min_free < 0 || i < min_free)
|
|
min_free = i;
|
|
}
|
|
if(min_free == -1){
|
|
struct descr *tmp;
|
|
tmp = realloc(d, (ndescr + 4) * sizeof(*d));
|
|
if(tmp == NULL)
|
|
krb5_warnx(context, "No memory");
|
|
else {
|
|
d = tmp;
|
|
reinit_descrs (d, ndescr);
|
|
memset(d + ndescr, 0, 4 * sizeof(*d));
|
|
for(i = ndescr; i < ndescr + 4; i++)
|
|
init_descr (&d[i]);
|
|
min_free = ndescr;
|
|
ndescr += 4;
|
|
}
|
|
}
|
|
|
|
tmout.tv_sec = TCP_TIMEOUT;
|
|
tmout.tv_usec = 0;
|
|
switch(select(max_fd + 1, &fds, 0, 0, &tmout)){
|
|
case 0:
|
|
break;
|
|
case -1:
|
|
if (errno != EINTR)
|
|
krb5_warn(context, errno, "select");
|
|
break;
|
|
default:
|
|
for(i = 0; i < ndescr; i++)
|
|
if(d[i].s >= 0 && FD_ISSET(d[i].s, &fds)) {
|
|
if(d[i].type == SOCK_DGRAM)
|
|
handle_udp(&d[i]);
|
|
else if(d[i].type == SOCK_STREAM)
|
|
handle_tcp(d, i, min_free);
|
|
}
|
|
}
|
|
}
|
|
free (d);
|
|
}
|