362 lines
9.1 KiB
C
362 lines
9.1 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 "kf_locl.h"
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RCSID("$Id: kf.c,v 1.15 2001/02/20 01:44:44 assar Exp $");
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krb5_context context;
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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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const char *service = SERVICE;
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const char *remote_name = NULL;
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int forwardable = 0;
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const char *ccache_name = NULL;
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static struct getargs args[] = {
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{ "port", 'p', arg_string, &port_str, "port to connect to", "port" },
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{ "login", 'l',arg_string, &remote_name,"remote login name","login"},
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{ "ccache", 'c',arg_string, &ccache_name, "remote cred cache","ccache"},
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{ "forwardable",'F',arg_flag,&forwardable,
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"Forward forwardable credentials", NULL },
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{ "forwardable",'G',arg_negative_flag,&forwardable,
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"Don't forward forwardable credentials", NULL },
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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, "hosts");
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exit(code);
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}
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static int
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client_setup(krb5_context *context, int *argc, char **argv)
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{
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int optind = 0;
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int port = 0;
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int status;
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setprogname (argv[0]);
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status = krb5_init_context (context);
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if (status)
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errx(1, "krb5_init_context failed: %d", status);
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forwardable = krb5_config_get_bool (*context, NULL,
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"libdefaults",
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"forwardable",
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NULL);
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if (getarg (args, num_args, *argc, argv, &optind))
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usage(1, args, num_args);
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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, PORT, "tcp", PORT_NUM);
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if(*argc - optind < 1)
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usage(1, args, num_args);
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*argc = optind;
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return port;
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}
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/*
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* forward creds to `hostname'/`service' over `sock'
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* return 0 iff OK
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*/
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static int
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proto (int sock, const char *hostname, 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_data data;
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krb5_data packet;
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krb5_data data_send;
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u_int32_t len, net_len;
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krb5_ccache ccache;
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krb5_creds creds;
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krb5_kdc_flags flags;
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krb5_principal principal;
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char ret_string[10];
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ssize_t n;
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status = krb5_auth_con_init (context, &auth_context);
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if (status) {
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krb5_warn (context, status, "krb5_auth_con_init");
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return 1;
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}
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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_warn (context, status, "krb5_auth_con_setaddr");
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return 1;
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}
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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_warn (context, status, "krb5_sname_to_principal");
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return 1;
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}
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status = krb5_sendauth (context,
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&auth_context,
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&sock,
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VERSION,
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NULL,
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server,
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AP_OPTS_MUTUAL_REQUIRED,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL);
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if (status) {
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krb5_warn(context, status, "krb5_sendauth");
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return 1;
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}
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if (remote_name == NULL) {
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remote_name = get_default_username ();
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if (remote_name == NULL)
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errx (1, "who are you?");
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}
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krb5_data_zero(&data_send);
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data_send.data = (void *)remote_name;
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data_send.length = strlen(remote_name) + 1;
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status = krb5_write_message(context, &sock, &data_send);
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if (status) {
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krb5_warn (context, status, "krb5_write_message");
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return 1;
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}
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if (ccache_name == NULL)
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ccache_name = "";
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data_send.data = (void *)ccache_name;
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data_send.length = strlen(ccache_name)+1;
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status = krb5_write_message(context, &sock, &data_send);
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if (status) {
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krb5_warn (context, status, "krb5_write_message");
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return 1;
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}
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memset (&creds, 0, sizeof(creds));
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status = krb5_cc_default (context, &ccache);
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if (status) {
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krb5_warn (context, status, "krb5_cc_default");
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return 1;
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}
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status = krb5_cc_get_principal (context, ccache, &principal);
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if (status) {
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krb5_warn (context, status, "krb5_cc_get_principal");
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return 1;
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}
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creds.client = principal;
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status = krb5_build_principal (context,
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&creds.server,
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strlen(principal->realm),
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principal->realm,
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KRB5_TGS_NAME,
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principal->realm,
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NULL);
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if (status) {
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krb5_warn (context, status, "krb5_build_principal");
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return 1;
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}
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creds.times.endtime = 0;
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flags.i = 0;
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flags.b.forwarded = 1;
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flags.b.forwardable = forwardable;
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status = krb5_get_forwarded_creds (context,
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auth_context,
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ccache,
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flags.i,
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hostname,
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&creds,
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&data);
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if (status) {
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krb5_warn (context, status, "krb5_get_forwarded_creds");
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return 1;
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}
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status = krb5_mk_priv (context,
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auth_context,
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&data,
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&packet,
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NULL);
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if (status) {
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krb5_warn (context, status, "krb5_mk_priv");
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return 1;
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}
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len = packet.length;
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net_len = htonl(len);
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if (krb5_net_write (context, &sock, &net_len, 4) != 4) {
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krb5_warn (context, errno, "krb5_net_write");
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return 1;
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}
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if (krb5_net_write (context, &sock, packet.data, len) != len) {
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krb5_warn (context, errno, "krb5_net_write");
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return 1;
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}
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krb5_data_free (&data);
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n = krb5_net_read (context, &sock, &net_len, 4);
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if (n == 0) {
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krb5_warnx (context, "EOF in krb5_net_read");
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return 1;
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}
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if (n < 0) {
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krb5_warn (context, errno, "krb5_net_read");
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return 1;
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}
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len = ntohl(net_len);
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if (len >= sizeof(ret_string)) {
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krb5_warnx (context, "too long string back from %s", hostname);
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return 1;
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}
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n = krb5_net_read (context, &sock, ret_string, len);
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if (n == 0) {
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krb5_warnx (context, "EOF in krb5_net_read");
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return 1;
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}
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if (n < 0) {
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krb5_warn (context, errno, "krb5_net_read");
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return 1;
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}
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ret_string[sizeof(ret_string) - 1] = '\0';
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return(strcmp(ret_string,"ok"));
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}
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static int
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doit (const char *hostname, int port, const char *service)
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{
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struct addrinfo *ai, *a;
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struct addrinfo hints;
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int error;
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char portstr[NI_MAXSERV];
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memset (&hints, 0, sizeof(hints));
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hints.ai_socktype = SOCK_STREAM;
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hints.ai_protocol = IPPROTO_TCP;
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snprintf (portstr, sizeof(portstr), "%u", ntohs(port));
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error = getaddrinfo (hostname, portstr, &hints, &ai);
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if (error) {
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errx (1, "getaddrinfo(%s): %s", hostname, gai_strerror(error));
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}
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for (a = ai; a != NULL; a = a->ai_next) {
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int s;
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s = socket (a->ai_family, a->ai_socktype, a->ai_protocol);
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if (s < 0)
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continue;
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if (connect (s, a->ai_addr, a->ai_addrlen) < 0) {
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warn ("connect(%s)", hostname);
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close (s);
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continue;
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}
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freeaddrinfo (ai);
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return proto (s, hostname, service);
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}
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warnx ("failed to contact %s", hostname);
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freeaddrinfo (ai);
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return 1;
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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 argcc,port,i;
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int ret=0;
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argcc = argc;
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port = client_setup(&context, &argcc, argv);
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for (i = argcc;i < argc; i++) {
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ret = doit (argv[i], port, service);
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warnx ("%s %s", argv[i], ret ? "failed" : "ok");
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}
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return(ret);
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}
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