crypto/heimdal-0.6.3/appl/kf/kf.c

   1 /*
   2  * Copyright (c) 1997 - 2000, 2002 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "kf_locl.h"
  35 RCSID("$Id: kf.c,v 1.17 2002/09/05 15:00:03 joda Exp $");
  36
  37 krb5_context context;
  38 static int help_flag;
  39 static int version_flag;
  40 static char *port_str;
  41 const char *service     = KF_SERVICE;
  42 const char *remote_name = NULL;
  43 int forwardable   = 0;
  44 const char *ccache_name = NULL;
  45
  46 static struct getargs args[] = {
  47     { "port", 'p', arg_string, &port_str, "port to connect to", "port" },
  48     { "login", 'l',arg_string, &remote_name,"remote login name","login"},
  49     { "ccache", 'c',arg_string, &ccache_name, "remote cred cache","ccache"},
  50     { "forwardable",'F',arg_flag,&forwardable,
  51        "Forward forwardable credentials", NULL },
  52     { "forwardable",'G',arg_negative_flag,&forwardable,
  53        "Don't forward forwardable credentials", NULL },
  54     { "help", 'h', arg_flag, &help_flag },
  55     { "version", 0, arg_flag, &version_flag }
  56 };
  57
  58 static int num_args = sizeof(args) / sizeof(args[0]);
  59
  60 static void
  61 usage(int code, struct getargs *args, int num_args)
  62 {
  63     arg_printusage(args, num_args, NULL, "hosts");
  64     exit(code);
  65 }
  66
  67 static int
  68 client_setup(krb5_context *context, int *argc, char **argv)
  69 {
  70     int optind = 0;
  71     int port = 0;
  72     int status;
  73
  74     setprogname (argv[0]);
  75
  76     status = krb5_init_context (context);
  77     if (status)
  78         errx(1, "krb5_init_context failed: %d", status);
  79
  80     forwardable = krb5_config_get_bool (*context, NULL,
  81                                         "libdefaults",
  82                                         "forwardable",
  83                                         NULL);
  84
  85     if (getarg (args, num_args, *argc, argv, &optind))
  86         usage(1, args, num_args);
  87
  88     if(help_flag)
  89         usage (0, args, num_args);
  90     if(version_flag) {
  91         print_version(NULL);
  92         exit(0);
  93     }
  94
  95     if(port_str) {
  96         struct servent *s = roken_getservbyname(port_str, "tcp");
  97         if(s)
  98             port = s->s_port;
  99         else {
 100             char *ptr;
 101
 102             port = strtol (port_str, &ptr, 10);
 103             if (port == 0 && ptr == port_str)
 104                 errx (1, "Bad port `%s'", port_str);
 105             port = htons(port);
 106         }
 107     }
 108
 109     if (port == 0)
 110         port = krb5_getportbyname (*context, KF_PORT_NAME, "tcp", KF_PORT_NUM);
 111
 112     if(*argc - optind < 1)
 113         usage(1, args, num_args);
 114     *argc = optind;
 115
 116     return port;
 117 }
 118
 119 /*
 120  * forward creds to `hostname'/`service' over `sock'
 121  * return 0 iff OK
 122  */
 123
 124 static int
 125 proto (int sock, const char *hostname, const char *service,
 126        char *message, size_t len)
 127 {
 128     krb5_auth_context auth_context;
 129     krb5_error_code status;
 130     krb5_principal server;
 131     krb5_data data;
 132     krb5_data data_send;
 133
 134     krb5_ccache     ccache;
 135     krb5_creds      creds;
 136     krb5_kdc_flags  flags;
 137     krb5_principal  principal;
 138
 139     status = krb5_auth_con_init (context, &auth_context);
 140     if (status) {
 141         krb5_warn (context, status, "krb5_auth_con_init");
 142         return 1;
 143     }
 144
 145     status = krb5_auth_con_setaddrs_from_fd (context,
 146                                              auth_context,
 147                                              &sock);
 148     if (status) {
 149         krb5_warn (context, status, "krb5_auth_con_setaddr");
 150         return 1;
 151     }
 152
 153     status = krb5_sname_to_principal (context,
 154                                       hostname,
 155                                       service,
 156                                       KRB5_NT_SRV_HST,
 157                                       &server);
 158     if (status) {
 159         krb5_warn (context, status, "krb5_sname_to_principal");
 160         return 1;
 161     }
 162
 163     status = krb5_sendauth (context,
 164                             &auth_context,
 165                             &sock,
 166                             KF_VERSION_1,
 167                             NULL,
 168                             server,
 169                             AP_OPTS_MUTUAL_REQUIRED | AP_OPTS_USE_SUBKEY,
 170                             NULL,
 171                             NULL,
 172                             NULL,
 173                             NULL,
 174                             NULL,
 175                             NULL);
 176     if (status) {
 177         krb5_warn(context, status, "krb5_sendauth");
 178         return 1;
 179     }
 180
 181     if (ccache_name == NULL)
 182         ccache_name = "";
 183
 184     data_send.data   = (void *)remote_name;
 185     data_send.length = strlen(remote_name) + 1;
 186     status = krb5_write_priv_message(context, auth_context, &sock, &data_send);
 187     if (status) {
 188         krb5_warn (context, status, "krb5_write_message");
 189         return 1;
 190     }
 191     data_send.data   = (void *)ccache_name;
 192     data_send.length = strlen(ccache_name)+1;
 193     status = krb5_write_priv_message(context, auth_context, &sock, &data_send);
 194     if (status) {
 195         krb5_warn (context, status, "krb5_write_message");
 196         return 1;
 197     }
 198
 199     memset (&creds, 0, sizeof(creds));
 200
 201     status = krb5_cc_default (context, &ccache);
 202     if (status) {
 203         krb5_warn (context, status, "krb5_cc_default");
 204         return 1;
 205     }
 206
 207     status = krb5_cc_get_principal (context, ccache, &principal);
 208     if (status) {
 209         krb5_warn (context, status, "krb5_cc_get_principal");
 210         return 1;
 211     }
 212
 213     creds.client = principal;
 214
 215     status = krb5_make_principal (context,
 216                                   &creds.server,
 217                                   principal->realm,
 218                                   KRB5_TGS_NAME,
 219                                   principal->realm,
 220                                   NULL);
 221
 222     if (status) {
 223         krb5_warn (context, status, "krb5_make_principal");
 224         return 1;
 225     }
 226
 227     creds.times.endtime = 0;
 228
 229     flags.i = 0;
 230     flags.b.forwarded   = 1;
 231     flags.b.forwardable = forwardable;
 232
 233     status = krb5_get_forwarded_creds (context,
 234                                        auth_context,
 235                                        ccache,
 236                                        flags.i,
 237                                        hostname,
 238                                        &creds,
 239                                        &data);
 240     if (status) {
 241         krb5_warn (context, status, "krb5_get_forwarded_creds");
 242         return 1;
 243     }
 244
 245     status = krb5_write_priv_message(context, auth_context, &sock, &data);
 246
 247     if (status) {
 248         krb5_warn (context, status, "krb5_mk_priv");
 249         return 1;
 250     }
 251
 252     krb5_data_free (&data);
 253
 254     status = krb5_read_priv_message(context, auth_context, &sock, &data);
 255     if (status) {
 256         krb5_warn (context, status, "krb5_mk_priv");
 257         return 1;
 258     }
 259     if(data.length >= len) {
 260         krb5_warnx (context, "returned string is too long, truncating");
 261         memcpy(message, data.data, len);
 262         message[len - 1] = '\0';
 263     } else {
 264         memcpy(message, data.data, data.length);
 265         message[data.length] = '\0';
 266     }
 267     krb5_data_free (&data);
 268
 269     return(strcmp(message, "ok"));
 270 }
 271
 272 static int
 273 doit (const char *hostname, int port, const char *service,
 274       char *message, size_t len)
 275 {
 276     struct addrinfo *ai, *a;
 277     struct addrinfo hints;
 278     int error;
 279     char portstr[NI_MAXSERV];
 280
 281     memset (&hints, 0, sizeof(hints));
 282     hints.ai_socktype = SOCK_STREAM;
 283     hints.ai_protocol = IPPROTO_TCP;
 284
 285     snprintf (portstr, sizeof(portstr), "%u", ntohs(port));
 286
 287     error = getaddrinfo (hostname, portstr, &hints, &ai);
 288     if (error) {
 289         errx (1, "getaddrinfo(%s): %s", hostname, gai_strerror(error));
 290     }
 291
 292     for (a = ai; a != NULL; a = a->ai_next) {
 293         int s;
 294
 295         s = socket (a->ai_family, a->ai_socktype, a->ai_protocol);
 296         if (s < 0)
 297             continue;
 298         if (connect (s, a->ai_addr, a->ai_addrlen) < 0) {
 299             warn ("connect(%s)", hostname);
 300             close (s);
 301             continue;
 302         }
 303         freeaddrinfo (ai);
 304         return proto (s, hostname, service, message, len);
 305     }
 306     warnx ("failed to contact %s", hostname);
 307     freeaddrinfo (ai);
 308     return 1;
 309 }
 310
 311 int
 312 main(int argc, char **argv)
 313 {
 314     int argcc,port,i;
 315     int ret=0;
 316
 317     argcc = argc;
 318     port = client_setup(&context, &argcc, argv);
 319
 320     if (remote_name == NULL) {
 321         remote_name = get_default_username ();
 322         if (remote_name == NULL)
 323             errx (1, "who are you?");
 324     }
 325
 326     for (i = argcc;i < argc; i++) {
 327         char message[128];
 328         ret = doit (argv[i], port, service, message, sizeof(message));
 329         if(ret == 0)
 330             warnx ("%s: ok", argv[i]);
 331         else
 332             warnx ("%s: failed: %s", argv[i], message);
 333     }
 334     return(ret);
 335 }