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("$Id$");
  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, NULL, NULL },
  55     { "version", 0, arg_flag, &version_flag, NULL, NULL }
  56 };
  57
  58 static int num_args = sizeof(args) / sizeof(args[0]);
  59
  60 static void
  61 usage(int code, struct getargs *inargs, int num_inargs)
  62 {
  63     arg_printusage(inargs, num_inargs, NULL, "hosts");
  64     exit(code);
  65 }
  66
  67 static int
  68 client_setup(krb5_context *ctx, int *argc, char **argv)
  69 {
  70     int optidx = 0;
  71     int port = 0;
  72     int status;
  73
  74     setprogname (argv[0]);
  75
  76     status = krb5_init_context (ctx);
  77     if (status)
  78         errx(1, "krb5_init_context failed: %d", status);
  79
  80     forwardable = krb5_config_get_bool (*ctx, NULL,
  81                                         "libdefaults",
  82                                         "forwardable",
  83                                         NULL);
  84
  85     if (getarg (args, num_args, *argc, argv, &optidx))
  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 (*ctx, KF_PORT_NAME, "tcp", KF_PORT_NUM);
 111
 112     if(*argc - optidx < 1)
 113         usage(1, args, num_args);
 114     *argc = optidx;
 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 *svc,
 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_auth_con_free(context, auth_context);
 150         krb5_warn (context, status, "krb5_auth_con_setaddr");
 151         return 1;
 152     }
 153
 154     status = krb5_sname_to_principal (context,
 155                                       hostname,
 156                                       svc,
 157                                       KRB5_NT_SRV_HST,
 158                                       &server);
 159     if (status) {
 160         krb5_auth_con_free(context, auth_context);
 161         krb5_warn (context, status, "krb5_sname_to_principal");
 162         return 1;
 163     }
 164
 165     status = krb5_sendauth (context,
 166                             &auth_context,
 167                             &sock,
 168                             KF_VERSION_1,
 169                             NULL,
 170                             server,
 171                             AP_OPTS_MUTUAL_REQUIRED | AP_OPTS_USE_SUBKEY,
 172                             NULL,
 173                             NULL,
 174                             NULL,
 175                             NULL,
 176                             NULL,
 177                             NULL);
 178     if (status) {
 179         krb5_auth_con_free(context, auth_context);
 180         krb5_warn(context, status, "krb5_sendauth");
 181         return 1;
 182     }
 183
 184     if (ccache_name == NULL)
 185         ccache_name = "";
 186
 187     data_send.data   = (void *)remote_name;
 188     data_send.length = strlen(remote_name) + 1;
 189     status = krb5_write_priv_message(context, auth_context, &sock, &data_send);
 190     if (status) {
 191         krb5_auth_con_free(context, auth_context);
 192         krb5_warn (context, status, "krb5_write_message");
 193         return 1;
 194     }
 195     data_send.data   = (void *)ccache_name;
 196     data_send.length = strlen(ccache_name)+1;
 197     status = krb5_write_priv_message(context, auth_context, &sock, &data_send);
 198     if (status) {
 199         krb5_auth_con_free(context, auth_context);
 200         krb5_warn (context, status, "krb5_write_message");
 201         return 1;
 202     }
 203
 204     memset (&creds, 0, sizeof(creds));
 205
 206     status = krb5_cc_default (context, &ccache);
 207     if (status) {
 208         krb5_auth_con_free(context, auth_context);
 209         krb5_warn (context, status, "krb5_cc_default");
 210         return 1;
 211     }
 212
 213     status = krb5_cc_get_principal (context, ccache, &principal);
 214     if (status) {
 215         krb5_auth_con_free(context, auth_context);
 216         krb5_warn (context, status, "krb5_cc_get_principal");
 217         return 1;
 218     }
 219
 220     creds.client = principal;
 221
 222     status = krb5_make_principal (context,
 223                                   &creds.server,
 224                                   principal->realm,
 225                                   KRB5_TGS_NAME,
 226                                   principal->realm,
 227                                   NULL);
 228
 229     if (status) {
 230         krb5_auth_con_free(context, auth_context);
 231         krb5_warn (context, status, "krb5_make_principal");
 232         return 1;
 233     }
 234
 235     creds.times.endtime = 0;
 236
 237     flags.i = 0;
 238     flags.b.forwarded   = 1;
 239     flags.b.forwardable = forwardable;
 240
 241     status = krb5_get_forwarded_creds (context,
 242                                        auth_context,
 243                                        ccache,
 244                                        flags.i,
 245                                        hostname,
 246                                        &creds,
 247                                        &data);
 248     if (status) {
 249         krb5_auth_con_free(context, auth_context);
 250         krb5_warn (context, status, "krb5_get_forwarded_creds");
 251         return 1;
 252     }
 253
 254     status = krb5_write_priv_message(context, auth_context, &sock, &data);
 255
 256     if (status) {
 257         krb5_auth_con_free(context, auth_context);
 258         krb5_warn (context, status, "krb5_mk_priv");
 259         return 1;
 260     }
 261
 262     krb5_data_free (&data);
 263
 264     status = krb5_read_priv_message(context, auth_context, &sock, &data);
 265     krb5_auth_con_free(context, auth_context);
 266     if (status) {
 267         krb5_warn (context, status, "krb5_mk_priv");
 268         return 1;
 269     }
 270     if(data.length >= len) {
 271         krb5_warnx (context, "returned string is too long, truncating");
 272         memcpy(message, data.data, len);
 273         message[len - 1] = '\0';
 274     } else {
 275         memcpy(message, data.data, data.length);
 276         message[data.length] = '\0';
 277     }
 278     krb5_data_free (&data);
 279
 280     return strcmp(message, "ok") != 0;
 281 }
 282
 283 static int
 284 doit (const char *hostname, int port, const char *svc,
 285       char *message, size_t len)
 286 {
 287     struct addrinfo *ai, *a;
 288     struct addrinfo hints;
 289     int error;
 290     char portstr[NI_MAXSERV];
 291
 292     memset (&hints, 0, sizeof(hints));
 293     hints.ai_socktype = SOCK_STREAM;
 294     hints.ai_protocol = IPPROTO_TCP;
 295
 296     snprintf (portstr, sizeof(portstr), "%u", ntohs(port));
 297
 298     error = getaddrinfo (hostname, portstr, &hints, &ai);
 299     if (error) {
 300         errx (1, "getaddrinfo(%s): %s", hostname, gai_strerror(error));
 301     }
 302
 303     for (a = ai; a != NULL; a = a->ai_next) {
 304         int s;
 305
 306         s = socket (a->ai_family, a->ai_socktype, a->ai_protocol);
 307         if (s < 0)
 308             continue;
 309         if (connect (s, a->ai_addr, a->ai_addrlen) < 0) {
 310             warn ("connect(%s)", hostname);
 311             close (s);
 312             continue;
 313         }
 314         freeaddrinfo (ai);
 315         error = proto(s, hostname, svc, message, len);
 316         close(s);
 317         return error;
 318     }
 319     warnx ("failed to contact %s", hostname);
 320     freeaddrinfo (ai);
 321     return 1;
 322 }
 323
 324 int
 325 main(int argc, char **argv)
 326 {
 327     char userbuf[128];
 328     int argcc,port,i;
 329     int ret=0;
 330
 331     argcc = argc;
 332     port = client_setup(&context, &argcc, argv);
 333
 334     if (remote_name == NULL) {
 335         remote_name = roken_get_username(userbuf, sizeof(userbuf));
 336         if (remote_name == NULL)
 337             errx (1, "who are you?");
 338     }
 339
 340     for (i = argcc;i < argc; i++) {
 341         char message[128];
 342         ret = doit (argv[i], port, service, message, sizeof(message));
 343         if(ret == 0)
 344             warnx ("%s: ok", argv[i]);
 345         else
 346             warnx ("%s: failed: %s", argv[i], message);
 347     }
 348     return(ret);
 349 }