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 #include <config.h>
  35
  36 #include <stdlib.h>
  37 #include <krb5.h>
  38 #include <roken.h>
  39 #include <getarg.h>
  40 #include <parse_units.h>
  41 #include <parse_time.h>
  42
  43 static int krbtgt_only_flag;
  44 static char *service_string;
  45 static char *enctype_string;
  46 static char *flags_string;
  47 static char *valid_string;
  48 static int fcache_version;
  49 static int help_flag;
  50 static int version_flag;
  51
  52 static struct getargs args[] = {
  53     { "krbtgt-only", 0, arg_flag, &krbtgt_only_flag,
  54       "only copy local krbtgt" },
  55     { "service", 0, arg_string, &service_string,
  56       "limit to this service", "principal" },
  57     { "enctype", 0, arg_string, &enctype_string,
  58       "limit to this enctype", "enctype" },
  59     { "flags", 0, arg_string, &flags_string,
  60       "limit to these flags", "ticketflags" },
  61     { "valid-for", 0, arg_string, &valid_string,
  62       "limit to creds valid for at least this long", "time" },
  63     { "fcache-version", 0, arg_integer, &fcache_version,
  64       "file cache version to create" },
  65     { "version", 0, arg_flag, &version_flag },
  66     { "help", 'h', arg_flag, &help_flag }
  67 };
  68
  69 static void
  70 usage(int ret)
  71 {
  72     arg_printusage(args,
  73                    sizeof(args) / sizeof(*args),
  74                    NULL,
  75                    "[from-cache] to-cache");
  76     exit(ret);
  77 }
  78
  79 static int32_t
  80 bitswap32(int32_t b)
  81 {
  82     int32_t r = 0;
  83     int i;
  84     for (i = 0; i < 32; i++) {
  85         r = r << 1 | (b & 1);
  86         b = b >> 1;
  87     }
  88     return r;
  89 }
  90
  91 static void
  92 parse_ticket_flags(krb5_context context,
  93                    const char *string, krb5_ticket_flags *ret_flags)
  94 {
  95     TicketFlags ff;
  96     int flags = parse_flags(string, asn1_TicketFlags_units(), 0);
  97     if (flags == -1)    /* XXX */
  98         krb5_errx(context, 1, "bad flags specified: \"%s\"", string);
  99
 100     memset(&ff, 0, sizeof(ff));
 101     ff.proxy = 1;
 102     if (parse_flags("proxy", asn1_TicketFlags_units(), 0) == TicketFlags2int(ff))
 103         ret_flags->i = flags;
 104     else
 105         ret_flags->i = bitswap32(flags);
 106 }
 107
 108 struct ctx {
 109     krb5_flags whichfields;
 110     krb5_creds mcreds;
 111 };
 112
 113 static krb5_boolean
 114 matchfunc(krb5_context context, void *ptr, const krb5_creds *creds)
 115 {
 116     struct ctx *ctx = ptr;
 117     if (krb5_compare_creds(context, ctx->whichfields, &ctx->mcreds, creds))
 118         return TRUE;
 119     return FALSE;
 120 }
 121
 122 int
 123 main(int argc, char **argv)
 124 {
 125     krb5_error_code ret;
 126     krb5_context context;
 127     int optidx = 0;
 128     const char *from_name, *to_name;
 129     krb5_ccache from_ccache, to_ccache;
 130     unsigned int matched;
 131     struct ctx ctx;
 132
 133     setprogname(argv[0]);
 134
 135     memset(&ctx, 0, sizeof(ctx));
 136
 137     if (getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optidx))
 138         usage(1);
 139
 140     if (help_flag)
 141         usage(0);
 142
 143     if (version_flag) {
 144         print_version(NULL);
 145         exit(0);
 146     }
 147     argc -= optidx;
 148     argv += optidx;
 149
 150     if (argc < 1 || argc > 2)
 151         usage(1);
 152
 153     if (krb5_init_context(&context))
 154         errx(1, "krb5_init_context failed");
 155
 156     if (service_string) {
 157         ret = krb5_parse_name(context, service_string, &ctx.mcreds.server);
 158         if (ret)
 159             krb5_err(context, 1, ret, "%s", service_string);
 160     }
 161     if (enctype_string) {
 162         krb5_enctype enctype;
 163         ret = krb5_string_to_enctype(context, enctype_string, &enctype);
 164         if (ret)
 165             krb5_err(context, 1, ret, "%s", enctype_string);
 166         ctx.whichfields |= KRB5_TC_MATCH_KEYTYPE;
 167         ctx.mcreds.session.keytype = enctype;
 168     }
 169     if (flags_string) {
 170         parse_ticket_flags(context, flags_string, &ctx.mcreds.flags);
 171         ctx.whichfields |= KRB5_TC_MATCH_FLAGS;
 172     }
 173     if (valid_string) {
 174         time_t t = parse_time(valid_string, "s");
 175         if(t < 0)
 176             errx(1, "unknown time \"%s\"", valid_string);
 177         ctx.mcreds.times.endtime = time(NULL) + t;
 178         ctx.whichfields |= KRB5_TC_MATCH_TIMES;
 179     }
 180     if (fcache_version)
 181         krb5_set_fcache_version(context, fcache_version);
 182
 183     if (argc == 1) {
 184         from_name = krb5_cc_default_name(context);
 185         to_name = argv[0];
 186     } else {
 187         from_name = argv[0];
 188         to_name = argv[1];
 189     }
 190
 191     ret = krb5_cc_resolve(context, from_name, &from_ccache);
 192     if (ret)
 193         krb5_err(context, 1, ret, "%s", from_name);
 194
 195     if (krbtgt_only_flag) {
 196         krb5_principal client;
 197         ret = krb5_cc_get_principal(context, from_ccache, &client);
 198         if (ret)
 199             krb5_err(context, 1, ret, "getting default principal");
 200         ret = krb5_make_principal(context, &ctx.mcreds.server,
 201                                   krb5_principal_get_realm(context, client),
 202                                   KRB5_TGS_NAME,
 203                                   krb5_principal_get_realm(context, client),
 204                                   NULL);
 205         if (ret)
 206             krb5_err(context, 1, ret, "constructing krbtgt principal");
 207         krb5_free_principal(context, client);
 208     }
 209     ret = krb5_cc_resolve(context, to_name, &to_ccache);
 210     if (ret)
 211         krb5_err(context, 1, ret, "%s", to_name);
 212
 213     ret = krb5_cc_copy_match_f(context, from_ccache, to_ccache,
 214                                matchfunc, &ctx, &matched);
 215     if (ret)
 216         krb5_err(context, 1, ret, "copying cred cache");
 217
 218     krb5_cc_close(context, from_ccache);
 219     if(matched == 0)
 220         krb5_cc_destroy(context, to_ccache);
 221     else
 222         krb5_cc_close(context, to_ccache);
 223     krb5_free_context(context);
 224     return matched == 0;
 225 }