crypto/dist/heimdal/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("$Heimdal: kf.c 11400 2002-09-05 15:00:03Z joda $"
  36         "$NetBSD$");
  37
  38 krb5_context context;
  39 static int help_flag;
  40 static int version_flag;
  41 static char *port_str;
  42 const char *service     = KF_SERVICE;
  43 const char *remote_name = NULL;
  44 int forwardable   = 0;
  45 const char *ccache_name = NULL;
  46
  47 static struct getargs args[] = {
  48     { "port", 'p', arg_string, &port_str, "port to connect to", "port" },
  49     { "login", 'l',arg_string, &remote_name,"remote login name","login"},
  50     { "ccache", 'c',arg_string, &ccache_name, "remote cred cache","ccache"},
  51     { "forwardable",'F',arg_flag,&forwardable,
  52        "Forward forwardable credentials", NULL },
  53     { "forwardable",'G',arg_negative_flag,&forwardable,
  54        "Don't forward forwardable credentials", NULL },
  55     { "help", 'h', arg_flag, &help_flag },
  56     { "version", 0, arg_flag, &version_flag }
  57 };
  58
  59 static int num_args = sizeof(args) / sizeof(args[0]);
  60
  61 static void
  62 usage(int code, struct getargs *args, int num_args)
  63 {
  64     arg_printusage(args, num_args, NULL, "hosts");
  65     exit(code);
  66 }
  67
  68 static int
  69 client_setup(krb5_context *context, int *argc, char **argv)
  70 {
  71     int optind = 0;
  72     int port = 0;
  73     int status;
  74
  75     setprogname (argv[0]);
  76
  77     status = krb5_init_context (context);
  78     if (status)
  79         errx(1, "krb5_init_context failed: %d", status);
  80
  81     forwardable = krb5_config_get_bool (*context, NULL,
  82                                         "libdefaults",
  83                                         "forwardable",
  84                                         NULL);
  85
  86     if (getarg (args, num_args, *argc, argv, &optind))
  87         usage(1, args, num_args);
  88
  89     if(help_flag)
  90         usage (0, args, num_args);
  91     if(version_flag) {
  92         print_version(NULL);
  93         exit(0);
  94     }
  95
  96     if(port_str) {
  97         struct servent *s = roken_getservbyname(port_str, "tcp");
  98         if(s)
  99             port = s->s_port;
 100         else {
 101             char *ptr;
 102
 103             port = strtol (port_str, &ptr, 10);
 104             if (port == 0 && ptr == port_str)
 105                 errx (1, "Bad port `%s'", port_str);
 106             port = htons(port);
 107         }
 108     }
 109
 110     if (port == 0)
 111         port = krb5_getportbyname (*context, KF_PORT_NAME, "tcp", KF_PORT_NUM);
 112
 113     if(*argc - optind < 1)
 114         usage(1, args, num_args);
 115     *argc = optind;
 116
 117     return port;
 118 }
 119
 120 /*
 121  * forward creds to `hostname'/`service' over `sock'
 122  * return 0 iff OK
 123  */
 124
 125 static int
 126 proto (int sock, const char *hostname, const char *service,
 127        char *message, size_t len)
 128 {
 129     krb5_auth_context auth_context;
 130     krb5_error_code status;
 131     krb5_principal server;
 132     krb5_data data;
 133     krb5_data data_send;
 134
 135     krb5_ccache     ccache;
 136     krb5_creds      creds;
 137     krb5_kdc_flags  flags;
 138     krb5_principal  principal;
 139
 140     status = krb5_auth_con_init (context, &auth_context);
 141     if (status) {
 142         krb5_warn (context, status, "krb5_auth_con_init");
 143         return 1;
 144     }
 145
 146     status = krb5_auth_con_setaddrs_from_fd (context,
 147                                              auth_context,
 148                                              &sock);
 149     if (status) {
 150         krb5_warn (context, status, "krb5_auth_con_setaddr");
 151         return 1;
 152     }
 153
 154     status = krb5_sname_to_principal (context,
 155                                       hostname,
 156                                       service,
 157                                       KRB5_NT_SRV_HST,
 158                                       &server);
 159     if (status) {
 160         krb5_warn (context, status, "krb5_sname_to_principal");
 161         return 1;
 162     }
 163
 164     status = krb5_sendauth (context,
 165                             &auth_context,
 166                             &sock,
 167                             KF_VERSION_1,
 168                             NULL,
 169                             server,
 170                             AP_OPTS_MUTUAL_REQUIRED | AP_OPTS_USE_SUBKEY,
 171                             NULL,
 172                             NULL,
 173                             NULL,
 174                             NULL,
 175                             NULL,
 176                             NULL);
 177     if (status) {
 178         krb5_warn(context, status, "krb5_sendauth");
 179         return 1;
 180     }
 181
 182     if (ccache_name == NULL)
 183         ccache_name = "";
 184
 185     data_send.data   = (void *)remote_name;
 186     data_send.length = strlen(remote_name) + 1;
 187     status = krb5_write_priv_message(context, auth_context, &sock, &data_send);
 188     if (status) {
 189         krb5_warn (context, status, "krb5_write_message");
 190         return 1;
 191     }
 192     data_send.data   = (void *)ccache_name;
 193     data_send.length = strlen(ccache_name)+1;
 194     status = krb5_write_priv_message(context, auth_context, &sock, &data_send);
 195     if (status) {
 196         krb5_warn (context, status, "krb5_write_message");
 197         return 1;
 198     }
 199
 200     memset (&creds, 0, sizeof(creds));
 201
 202     status = krb5_cc_default (context, &ccache);
 203     if (status) {
 204         krb5_warn (context, status, "krb5_cc_default");
 205         return 1;
 206     }
 207
 208     status = krb5_cc_get_principal (context, ccache, &principal);
 209     if (status) {
 210         krb5_warn (context, status, "krb5_cc_get_principal");
 211         return 1;
 212     }
 213
 214     creds.client = principal;
 215
 216     status = krb5_make_principal (context,
 217                                   &creds.server,
 218                                   principal->realm,
 219                                   KRB5_TGS_NAME,
 220                                   principal->realm,
 221                                   NULL);
 222
 223     if (status) {
 224         krb5_warn (context, status, "krb5_make_principal");
 225         return 1;
 226     }
 227
 228     creds.times.endtime = 0;
 229
 230     flags.i = 0;
 231     flags.b.forwarded   = 1;
 232     flags.b.forwardable = forwardable;
 233
 234     status = krb5_get_forwarded_creds (context,
 235                                        auth_context,
 236                                        ccache,
 237                                        flags.i,
 238                                        hostname,
 239                                        &creds,
 240                                        &data);
 241     if (status) {
 242         krb5_warn (context, status, "krb5_get_forwarded_creds");
 243         return 1;
 244     }
 245
 246     status = krb5_write_priv_message(context, auth_context, &sock, &data);
 247
 248     if (status) {
 249         krb5_warn (context, status, "krb5_mk_priv");
 250         return 1;
 251     }
 252
 253     krb5_data_free (&data);
 254
 255     status = krb5_read_priv_message(context, auth_context, &sock, &data);
 256     if (status) {
 257         krb5_warn (context, status, "krb5_mk_priv");
 258         return 1;
 259     }
 260     if(data.length >= len) {
 261         krb5_warnx (context, "returned string is too long, truncating");
 262         memcpy(message, data.data, len);
 263         message[len - 1] = '\0';
 264     } else {
 265         memcpy(message, data.data, data.length);
 266         message[data.length] = '\0';
 267     }
 268     krb5_data_free (&data);
 269
 270     return(strcmp(message, "ok"));
 271 }
 272
 273 static int
 274 doit (const char *hostname, int port, const char *service,
 275       char *message, size_t len)
 276 {
 277     struct addrinfo *ai, *a;
 278     struct addrinfo hints;
 279     int error;
 280     char portstr[NI_MAXSERV];
 281
 282     memset (&hints, 0, sizeof(hints));
 283     hints.ai_socktype = SOCK_STREAM;
 284     hints.ai_protocol = IPPROTO_TCP;
 285
 286     snprintf (portstr, sizeof(portstr), "%u", ntohs(port));
 287
 288     error = getaddrinfo (hostname, portstr, &hints, &ai);
 289     if (error) {
 290         errx (1, "getaddrinfo(%s): %s", hostname, gai_strerror(error));
 291     }
 292
 293     for (a = ai; a != NULL; a = a->ai_next) {
 294         int s;
 295
 296         s = socket (a->ai_family, a->ai_socktype, a->ai_protocol);
 297         if (s < 0)
 298             continue;
 299         if (connect (s, a->ai_addr, a->ai_addrlen) < 0) {
 300             warn ("connect(%s)", hostname);
 301             close (s);
 302             continue;
 303         }
 304         freeaddrinfo (ai);
 305         return proto (s, hostname, service, message, len);
 306     }
 307     warnx ("failed to contact %s", hostname);
 308     freeaddrinfo (ai);
 309     return 1;
 310 }
 311
 312 int
 313 main(int argc, char **argv)
 314 {
 315     int argcc,port,i;
 316     int ret=0;
 317
 318     argcc = argc;
 319     port = client_setup(&context, &argcc, argv);
 320
 321     if (remote_name == NULL) {
 322         remote_name = get_default_username ();
 323         if (remote_name == NULL)
 324             errx (1, "who are you?");
 325     }
 326
 327     for (i = argcc;i < argc; i++) {
 328         char message[128];
 329         ret = doit (argv[i], port, service, message, sizeof(message));
 330         if(ret == 0)
 331             warnx ("%s: ok", argv[i]);
 332         else
 333             warnx ("%s: failed: %s", argv[i], message);
 334     }
 335     return(ret);
 336 }