308 lines
8.5 KiB
C
308 lines
8.5 KiB
C
/*
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* Copyright (c) 1997 - 2002 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 "kf_locl.h"
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RCSID("$Id: kfd.c,v 1.10 2002/09/04 20:31:48 joda Exp $");
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krb5_context context;
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char krb5_tkfile[MAXPATHLEN];
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static int help_flag;
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static int version_flag;
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static char *port_str;
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char *service = KF_SERVICE;
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int do_inetd = 0;
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static char *regpag_str=NULL;
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static struct getargs args[] = {
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{ "port", 'p', arg_string, &port_str, "port to listen to", "port" },
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{ "inetd",'i',arg_flag, &do_inetd,
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"Not started from inetd", NULL },
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{ "regpag",'R',arg_string,®pag_str,"path to regpag binary","regpag"},
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{ "help", 'h', arg_flag, &help_flag },
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{ "version", 0, arg_flag, &version_flag }
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};
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static int num_args = sizeof(args) / sizeof(args[0]);
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static void
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usage(int code, struct getargs *args, int num_args)
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{
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arg_printusage(args, num_args, NULL, "");
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exit(code);
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}
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static int
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server_setup(krb5_context *context, int argc, char **argv)
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{
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int port = 0;
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int local_argc;
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local_argc = krb5_program_setup(context, argc, argv, args, num_args, usage);
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if(help_flag)
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(*usage)(0, args, num_args);
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if(version_flag) {
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print_version(NULL);
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exit(0);
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}
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if(port_str){
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struct servent *s = roken_getservbyname(port_str, "tcp");
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if(s)
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port = s->s_port;
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else {
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char *ptr;
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port = strtol (port_str, &ptr, 10);
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if (port == 0 && ptr == port_str)
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errx (1, "Bad port `%s'", port_str);
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port = htons(port);
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}
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}
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if (port == 0)
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port = krb5_getportbyname (*context, KF_PORT_NAME, "tcp", KF_PORT_NUM);
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if(argv[local_argc] != NULL)
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usage(1, args, num_args);
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return port;
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}
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static int protocol_version;
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static krb5_boolean
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kfd_match_version(const void *arg, const char *version)
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{
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if(strcmp(version, KF_VERSION_1) == 0) {
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protocol_version = 1;
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return TRUE;
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} else if (strlen(version) == 4 &&
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version[0] == '0' &&
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version[1] == '.' &&
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(version[2] == '4' || version[2] == '3') &&
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islower(version[3])) {
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protocol_version = 0;
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return TRUE;
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}
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return FALSE;
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}
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static int
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proto (int sock, const char *service)
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{
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krb5_auth_context auth_context;
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krb5_error_code status;
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krb5_principal server;
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krb5_ticket *ticket;
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char *name;
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char ret_string[10];
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char hostname[MAXHOSTNAMELEN];
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krb5_data data;
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krb5_data remotename;
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krb5_data tk_file;
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krb5_ccache ccache;
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char ccname[MAXPATHLEN];
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struct passwd *pwd;
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status = krb5_auth_con_init (context, &auth_context);
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if (status)
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krb5_err(context, 1, status, "krb5_auth_con_init");
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status = krb5_auth_con_setaddrs_from_fd (context,
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auth_context,
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&sock);
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if (status)
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krb5_err(context, 1, status, "krb5_auth_con_setaddr");
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if(gethostname (hostname, sizeof(hostname)) < 0)
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krb5_err(context, 1, errno, "gethostname");
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status = krb5_sname_to_principal (context,
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hostname,
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service,
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KRB5_NT_SRV_HST,
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&server);
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if (status)
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krb5_err(context, 1, status, "krb5_sname_to_principal");
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status = krb5_recvauth_match_version (context,
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&auth_context,
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&sock,
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kfd_match_version,
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NULL,
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server,
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0,
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NULL,
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&ticket);
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if (status)
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krb5_err(context, 1, status, "krb5_recvauth");
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status = krb5_unparse_name (context,
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ticket->client,
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&name);
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if (status)
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krb5_err(context, 1, status, "krb5_unparse_name");
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if(protocol_version == 0) {
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data.data = "old clnt"; /* XXX old clients only had room for
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10 bytes of message, and also
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didn't show it to the user */
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data.length = strlen(data.data) + 1;
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krb5_write_message(context, &sock, &data);
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sleep(2); /* XXX give client time to finish */
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krb5_errx(context, 1, "old client; exiting");
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}
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status=krb5_read_priv_message (context, auth_context,
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&sock, &remotename);
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if (status)
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krb5_err(context, 1, status, "krb5_read_message");
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status=krb5_read_priv_message (context, auth_context,
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&sock, &tk_file);
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if (status)
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krb5_err(context, 1, status, "krb5_read_message");
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krb5_data_zero (&data);
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if(((char*)remotename.data)[remotename.length-1] != '\0')
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krb5_errx(context, 1, "unterminated received");
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if(((char*)tk_file.data)[tk_file.length-1] != '\0')
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krb5_errx(context, 1, "unterminated received");
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status = krb5_read_priv_message(context, auth_context, &sock, &data);
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if (status) {
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krb5_err(context, 1, errno, "krb5_read_priv_message");
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goto out;
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}
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pwd = getpwnam ((char *)(remotename.data));
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if (pwd == NULL) {
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status=1;
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krb5_warnx(context, "getpwnam: %s failed",(char *)(remotename.data));
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goto out;
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}
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if(!krb5_kuserok (context,
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ticket->client,
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(char *)(remotename.data))) {
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status=1;
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krb5_warnx(context, "krb5_kuserok: permission denied");
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goto out;
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}
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if (setgid(pwd->pw_gid) < 0) {
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krb5_warn(context, errno, "setgid");
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goto out;
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}
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if (setuid(pwd->pw_uid) < 0) {
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krb5_warn(context, errno, "setuid");
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goto out;
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}
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if (tk_file.length != 1)
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snprintf (ccname, sizeof(ccname), "%s", (char *)(tk_file.data));
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else
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snprintf (ccname, sizeof(ccname), "FILE:/tmp/krb5cc_%u",pwd->pw_uid);
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status = krb5_cc_resolve (context, ccname, &ccache);
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if (status) {
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krb5_warn(context, status, "krb5_cc_resolve");
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goto out;
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}
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status = krb5_cc_initialize (context, ccache, ticket->client);
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if (status) {
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krb5_warn(context, status, "krb5_cc_initialize");
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goto out;
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}
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status = krb5_rd_cred2 (context, auth_context, ccache, &data);
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krb5_cc_close (context, ccache);
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if (status) {
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krb5_warn(context, status, "krb5_rd_cred");
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goto out;
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}
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strlcpy(krb5_tkfile,ccname,sizeof(krb5_tkfile));
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krb5_warnx(context, "%s forwarded ticket to %s,%s",
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name,
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(char *)(remotename.data),ccname);
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out:
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if (status) {
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strcpy(ret_string, "no");
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krb5_warnx(context, "failed");
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} else {
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strcpy(ret_string, "ok");
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}
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krb5_data_free (&tk_file);
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krb5_data_free (&remotename);
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krb5_data_free (&data);
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free(name);
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data.data = ret_string;
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data.length = strlen(ret_string) + 1;
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return krb5_write_priv_message(context, auth_context, &sock, &data);
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}
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static int
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doit (int port, const char *service)
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{
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if (do_inetd)
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mini_inetd(port);
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return proto (STDIN_FILENO, service);
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}
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int
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main(int argc, char **argv)
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{
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int port;
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int ret;
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krb5_log_facility *fac;
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setprogname (argv[0]);
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roken_openlog (argv[0], LOG_ODELAY | LOG_PID,LOG_AUTH);
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port = server_setup(&context, argc, argv);
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ret = krb5_openlog(context, "kfd", &fac);
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if(ret) krb5_err(context, 1, ret, "krb5_openlog");
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ret = krb5_set_warn_dest(context, fac);
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if(ret) krb5_err(context, 1, ret, "krb5_set_warn_dest");
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ret = doit (port, service);
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closelog();
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if (ret == 0 && regpag_str != NULL)
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ret = execl(regpag_str, "regpag", "-t", krb5_tkfile, "-r", NULL);
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return ret;
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}
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