kuser/copy_cred_cache.c

   1 /*
   2  * Copyright (c) 2004 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 #ifdef HAVE_CONFIG_H
  35 #include <config.h>
  36 RCSID("$Id$");
  37 #endif
  38
  39 #include <stdlib.h>
  40 #include <krb5.h>
  41 #include <roken.h>
  42 #include <getarg.h>
  43 #include <parse_units.h>
  44 #include <parse_time.h>
  45
  46 static int krbtgt_only_flag;
  47 static char *service_string;
  48 static char *enctype_string;
  49 static char *flags_string;
  50 static char *valid_string;
  51 static int fcache_version;
  52 static int help_flag;
  53 static int version_flag;
  54
  55 static struct getargs args[] = {
  56     { "krbtgt-only", 0, arg_flag, &krbtgt_only_flag,
  57       "only copy local krbtgt" },
  58     { "service", 0, arg_string, &service_string,
  59       "limit to this service", "principal" },
  60     { "enctype", 0, arg_string, &enctype_string,
  61       "limit to this enctype", "enctype" },
  62     { "flags", 0, arg_string, &flags_string,
  63       "limit to these flags", "ticketflags" },
  64     { "valid-for", 0, arg_string, &valid_string,
  65       "limit to creds valid for at least this long", "time" },
  66     { "fcache-version", 0, arg_integer, &fcache_version,
  67       "file cache version to create" },
  68     { "version", 0, arg_flag, &version_flag },
  69     { "help", 'h', arg_flag, &help_flag }
  70 };
  71
  72 static void
  73 usage(int ret)
  74 {
  75     arg_printusage(args,
  76                    sizeof(args) / sizeof(*args),
  77                    NULL,
  78                    "[from-cache] to-cache");
  79     exit(ret);
  80 }
  81
  82 static int32_t
  83 bitswap32(int32_t b)
  84 {
  85     int32_t r = 0;
  86     int i;
  87     for (i = 0; i < 32; i++) {
  88         r = r << 1 | (b & 1);
  89         b = b >> 1;
  90     }
  91     return r;
  92 }
  93
  94 static void
  95 parse_ticket_flags(krb5_context context,
  96                    const char *string, krb5_ticket_flags *ret_flags)
  97 {
  98     TicketFlags ff;
  99     int flags = parse_flags(string, asn1_TicketFlags_units(), 0);
 100     if (flags == -1)    /* XXX */
 101         krb5_errx(context, 1, "bad flags specified: \"%s\"", string);
 102
 103     memset(&ff, 0, sizeof(ff));
 104     ff.proxy = 1;
 105     if (parse_flags("proxy", asn1_TicketFlags_units(), 0) == TicketFlags2int(ff))
 106         ret_flags->i = flags;
 107     else
 108         ret_flags->i = bitswap32(flags);
 109 }
 110
 111 int
 112 main(int argc, char **argv)
 113 {
 114     krb5_error_code ret;
 115     krb5_context context;
 116     int optidx = 0;
 117     const char *from_name, *to_name;
 118     krb5_ccache from_ccache, to_ccache;
 119     krb5_flags whichfields = 0;
 120     krb5_creds mcreds;
 121     unsigned int matched;
 122
 123     setprogname(argv[0]);
 124
 125     memset(&mcreds, 0, sizeof(mcreds));
 126
 127     if (getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optidx))
 128         usage(1);
 129
 130     if (help_flag)
 131         usage(0);
 132
 133     if (version_flag) {
 134         print_version(NULL);
 135         exit(0);
 136     }
 137     argc -= optidx;
 138     argv += optidx;
 139
 140     if (argc < 1 || argc > 2)
 141         usage(1);
 142
 143     if (krb5_init_context(&context))
 144         errx(1, "krb5_init_context failed");
 145
 146     if (service_string) {
 147         ret = krb5_parse_name(context, service_string, &mcreds.server);
 148         if (ret)
 149             krb5_err(context, 1, ret, "%s", service_string);
 150     }
 151     if (enctype_string) {
 152         krb5_enctype enctype;
 153         ret = krb5_string_to_enctype(context, enctype_string, &enctype);
 154         if (ret)
 155             krb5_err(context, 1, ret, "%s", enctype_string);
 156         whichfields |= KRB5_TC_MATCH_KEYTYPE;
 157         mcreds.session.keytype = enctype;
 158     }
 159     if (flags_string) {
 160         parse_ticket_flags(context, flags_string, &mcreds.flags);
 161         whichfields |= KRB5_TC_MATCH_FLAGS;
 162     }
 163     if (valid_string) {
 164         time_t t = parse_time(valid_string, "s");
 165         if(t < 0)
 166             errx(1, "unknown time \"%s\"", valid_string);
 167         mcreds.times.endtime = time(NULL) + t;
 168         whichfields |= KRB5_TC_MATCH_TIMES;
 169     }
 170     if (fcache_version)
 171         krb5_set_fcache_version(context, fcache_version);
 172
 173     if (argc == 1) {
 174         from_name = krb5_cc_default_name(context);
 175         to_name = argv[0];
 176     } else {
 177         from_name = argv[0];
 178         to_name = argv[1];
 179     }
 180
 181     ret = krb5_cc_resolve(context, from_name, &from_ccache);
 182     if (ret)
 183         krb5_err(context, 1, ret, "%s", from_name);
 184
 185     if (krbtgt_only_flag) {
 186         krb5_principal client;
 187         ret = krb5_cc_get_principal(context, from_ccache, &client);
 188         if (ret)
 189             krb5_err(context, 1, ret, "getting default principal");
 190         ret = krb5_make_principal(context, &mcreds.server,
 191                                   krb5_principal_get_realm(context, client),
 192                                   KRB5_TGS_NAME,
 193                                   krb5_principal_get_realm(context, client),
 194                                   NULL);
 195         if (ret)
 196             krb5_err(context, 1, ret, "constructing krbtgt principal");
 197         krb5_free_principal(context, client);
 198     }
 199     ret = krb5_cc_resolve(context, to_name, &to_ccache);
 200     if (ret)
 201         krb5_err(context, 1, ret, "%s", to_name);
 202
 203     ret = krb5_cc_copy_cache_match(context, from_ccache, to_ccache,
 204                                    whichfields, &mcreds, &matched);
 205     if (ret)
 206         krb5_err(context, 1, ret, "copying cred cache");
 207
 208     krb5_cc_close(context, from_ccache);
 209     if(matched == 0)
 210         krb5_cc_destroy(context, to_ccache);
 211     else
 212         krb5_cc_close(context, to_ccache);
 213     krb5_free_context(context);
 214     return matched == 0;
 215 }