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| Current File : //usr/src/crypto/heimdal/appl/kf/kfd.c |
/*
* Copyright (c) 1997 - 2002 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "kf_locl.h"
RCSID("$Id: kfd.c 15246 2005-05-27 13:47:20Z lha $");
krb5_context context;
char krb5_tkfile[MAXPATHLEN];
static int help_flag;
static int version_flag;
static char *port_str;
char *service = KF_SERVICE;
int do_inetd = 0;
static char *regpag_str=NULL;
static struct getargs args[] = {
{ "port", 'p', arg_string, &port_str, "port to listen to", "port" },
{ "inetd",'i',arg_flag, &do_inetd,
"Not started from inetd", NULL },
{ "regpag",'R',arg_string,®pag_str,"path to regpag binary","regpag"},
{ "help", 'h', arg_flag, &help_flag },
{ "version", 0, arg_flag, &version_flag }
};
static int num_args = sizeof(args) / sizeof(args[0]);
static void
usage(int code, struct getargs *args, int num_args)
{
arg_printusage(args, num_args, NULL, "");
exit(code);
}
static int
server_setup(krb5_context *context, int argc, char **argv)
{
int port = 0;
int local_argc;
local_argc = krb5_program_setup(context, argc, argv, args, num_args, usage);
if(help_flag)
(*usage)(0, args, num_args);
if(version_flag) {
print_version(NULL);
exit(0);
}
if(port_str){
struct servent *s = roken_getservbyname(port_str, "tcp");
if(s)
port = s->s_port;
else {
char *ptr;
port = strtol (port_str, &ptr, 10);
if (port == 0 && ptr == port_str)
errx (1, "Bad port `%s'", port_str);
port = htons(port);
}
}
if (port == 0)
port = krb5_getportbyname (*context, KF_PORT_NAME, "tcp", KF_PORT_NUM);
if(argv[local_argc] != NULL)
usage(1, args, num_args);
return port;
}
static int protocol_version;
static krb5_boolean
kfd_match_version(const void *arg, const char *version)
{
if(strcmp(version, KF_VERSION_1) == 0) {
protocol_version = 1;
return TRUE;
} else if (strlen(version) == 4 &&
version[0] == '0' &&
version[1] == '.' &&
(version[2] == '4' || version[2] == '3') &&
islower((unsigned char)version[3])) {
protocol_version = 0;
return TRUE;
}
return FALSE;
}
static int
proto (int sock, const char *service)
{
krb5_auth_context auth_context;
krb5_error_code status;
krb5_principal server;
krb5_ticket *ticket;
char *name;
char ret_string[10];
char hostname[MAXHOSTNAMELEN];
krb5_data data;
krb5_data remotename;
krb5_data tk_file;
krb5_ccache ccache;
char ccname[MAXPATHLEN];
struct passwd *pwd;
status = krb5_auth_con_init (context, &auth_context);
if (status)
krb5_err(context, 1, status, "krb5_auth_con_init");
status = krb5_auth_con_setaddrs_from_fd (context,
auth_context,
&sock);
if (status)
krb5_err(context, 1, status, "krb5_auth_con_setaddr");
if(gethostname (hostname, sizeof(hostname)) < 0)
krb5_err(context, 1, errno, "gethostname");
status = krb5_sname_to_principal (context,
hostname,
service,
KRB5_NT_SRV_HST,
&server);
if (status)
krb5_err(context, 1, status, "krb5_sname_to_principal");
status = krb5_recvauth_match_version (context,
&auth_context,
&sock,
kfd_match_version,
NULL,
server,
0,
NULL,
&ticket);
if (status)
krb5_err(context, 1, status, "krb5_recvauth");
status = krb5_unparse_name (context,
ticket->client,
&name);
if (status)
krb5_err(context, 1, status, "krb5_unparse_name");
if(protocol_version == 0) {
data.data = "old clnt"; /* XXX old clients only had room for
10 bytes of message, and also
didn't show it to the user */
data.length = strlen(data.data) + 1;
krb5_write_message(context, &sock, &data);
sleep(2); /* XXX give client time to finish */
krb5_errx(context, 1, "old client; exiting");
}
status=krb5_read_priv_message (context, auth_context,
&sock, &remotename);
if (status)
krb5_err(context, 1, status, "krb5_read_message");
status=krb5_read_priv_message (context, auth_context,
&sock, &tk_file);
if (status)
krb5_err(context, 1, status, "krb5_read_message");
krb5_data_zero (&data);
if(((char*)remotename.data)[remotename.length-1] != '\0')
krb5_errx(context, 1, "unterminated received");
if(((char*)tk_file.data)[tk_file.length-1] != '\0')
krb5_errx(context, 1, "unterminated received");
status = krb5_read_priv_message(context, auth_context, &sock, &data);
if (status) {
krb5_err(context, 1, errno, "krb5_read_priv_message");
goto out;
}
pwd = getpwnam ((char *)(remotename.data));
if (pwd == NULL) {
status=1;
krb5_warnx(context, "getpwnam: %s failed",(char *)(remotename.data));
goto out;
}
if(!krb5_kuserok (context,
ticket->client,
(char *)(remotename.data))) {
status=1;
krb5_warnx(context, "krb5_kuserok: permission denied");
goto out;
}
if (setgid(pwd->pw_gid) < 0) {
krb5_warn(context, errno, "setgid");
goto out;
}
if (setuid(pwd->pw_uid) < 0) {
krb5_warn(context, errno, "setuid");
goto out;
}
if (tk_file.length != 1)
snprintf (ccname, sizeof(ccname), "%s", (char *)(tk_file.data));
else
snprintf (ccname, sizeof(ccname), "FILE:/tmp/krb5cc_%lu",
(unsigned long)pwd->pw_uid);
status = krb5_cc_resolve (context, ccname, &ccache);
if (status) {
krb5_warn(context, status, "krb5_cc_resolve");
goto out;
}
status = krb5_cc_initialize (context, ccache, ticket->client);
if (status) {
krb5_warn(context, status, "krb5_cc_initialize");
goto out;
}
status = krb5_rd_cred2 (context, auth_context, ccache, &data);
krb5_cc_close (context, ccache);
if (status) {
krb5_warn(context, status, "krb5_rd_cred");
goto out;
}
strlcpy(krb5_tkfile,ccname,sizeof(krb5_tkfile));
krb5_warnx(context, "%s forwarded ticket to %s,%s",
name,
(char *)(remotename.data),ccname);
out:
if (status) {
strlcpy(ret_string, "no", sizeof(ret_string));
krb5_warnx(context, "failed");
} else {
strlcpy(ret_string, "ok", sizeof(ret_string));
}
krb5_data_free (&tk_file);
krb5_data_free (&remotename);
krb5_data_free (&data);
free(name);
data.data = ret_string;
data.length = strlen(ret_string) + 1;
return krb5_write_priv_message(context, auth_context, &sock, &data);
}
static int
doit (int port, const char *service)
{
if (do_inetd)
mini_inetd(port);
return proto (STDIN_FILENO, service);
}
int
main(int argc, char **argv)
{
int port;
int ret;
krb5_log_facility *fac;
setprogname (argv[0]);
roken_openlog (argv[0], LOG_ODELAY | LOG_PID,LOG_AUTH);
port = server_setup(&context, argc, argv);
ret = krb5_openlog(context, "kfd", &fac);
if(ret) krb5_err(context, 1, ret, "krb5_openlog");
ret = krb5_set_warn_dest(context, fac);
if(ret) krb5_err(context, 1, ret, "krb5_set_warn_dest");
ret = doit (port, service);
closelog();
if (ret == 0 && regpag_str != NULL)
ret = execl(regpag_str, "regpag", "-t", krb5_tkfile, "-r", NULL);
return ret;
}