kuser/kswitch.c

   1 /*
   2  * Copyright (c) 2008 - 2010 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 "kuser_locl.h"
  35 #include "kcc-commands.h"
  36
  37 #ifdef HAVE_READLINE
  38 char *readline(const char *prompt);
  39 #else
  40
  41 static char *
  42 readline(const char *prompt)
  43 {
  44     char buf[BUFSIZ];
  45     printf ("%s", prompt);
  46     fflush (stdout);
  47     if(fgets(buf, sizeof(buf), stdin) == NULL)
  48         return NULL;
  49     buf[strcspn(buf, "\r\n")] = '\0';
  50     return strdup(buf);
  51 }
  52
  53 #endif
  54
  55 /*
  56  *
  57  */
  58
  59 int
  60 kswitch(struct kswitch_options *opt, int argc, char **argv)
  61 {
  62     krb5_error_code ret;
  63     krb5_ccache id = NULL;
  64
  65     if (opt->cache_string && opt->principal_string)
  66         krb5_errx(kcc_context, 1,
  67                   N_("Both --cache and --principal given, choose one", ""));
  68
  69     if (opt->interactive_flag) {
  70         krb5_cc_cache_cursor cursor;
  71         krb5_ccache *ids = NULL;
  72         size_t i, len = 0;
  73         char *name;
  74         rtbl_t ct;
  75
  76         ct = rtbl_create();
  77
  78         rtbl_add_column(ct, "", 0);
  79         rtbl_add_column(ct, "Principal", 0);
  80         rtbl_set_column_prefix(ct, "Principal", "    ");
  81
  82         ret = krb5_cc_cache_get_first(kcc_context, NULL, &cursor);
  83         if (ret)
  84             krb5_err(kcc_context, 1, ret, "krb5_cc_cache_get_first");
  85
  86         while (krb5_cc_cache_next(kcc_context, cursor, &id) == 0) {
  87             krb5_principal p;
  88             char num[10];
  89
  90             ret = krb5_cc_get_principal(kcc_context, id, &p);
  91             if (ret)
  92                 continue;
  93
  94             ret = krb5_unparse_name(kcc_context, p, &name);
  95             krb5_free_principal(kcc_context, p);
  96
  97             snprintf(num, sizeof(num), "%d", (int)(len + 1));
  98             rtbl_add_column_entry(ct, "", num);
  99             rtbl_add_column_entry(ct, "Principal", name);
 100             free(name);
 101
 102             ids = erealloc(ids, (len + 1) * sizeof(ids[0]));
 103             ids[len] = id;
 104             len++;
 105         }
 106         krb5_cc_cache_end_seq_get(kcc_context, cursor);
 107
 108         rtbl_format(ct, stdout);
 109         rtbl_destroy(ct);
 110
 111         name = readline("Select number: ");
 112         if (name) {
 113             i = atoi(name);
 114             if (i == 0)
 115                 krb5_errx(kcc_context, 1, "Cache number '%s' is invalid", name);
 116             if (i > len)
 117                 krb5_errx(kcc_context, 1, "Cache number '%s' is too large", name);
 118
 119             id = ids[i - 1];
 120             ids[i - 1] = NULL;
 121         } else
 122             krb5_errx(kcc_context, 1, "No cache selected");
 123         for (i = 0; i < len; i++)
 124             if (ids[i])
 125                 krb5_cc_close(kcc_context, ids[i]);
 126
 127     } else if (opt->principal_string) {
 128         krb5_principal p;
 129
 130         ret = krb5_parse_name(kcc_context, opt->principal_string, &p);
 131         if (ret)
 132             krb5_err(kcc_context, 1, ret, "krb5_parse_name: %s",
 133                      opt->principal_string);
 134
 135         ret = krb5_cc_cache_match(kcc_context, p, &id);
 136         if (ret)
 137             krb5_err(kcc_context, 1, ret,
 138                      N_("Did not find principal: %s", ""),
 139                      opt->principal_string);
 140
 141         krb5_free_principal(kcc_context, p);
 142
 143     } else if (opt->cache_string) {
 144         const krb5_cc_ops *ops;
 145         char *str;
 146
 147         ops = krb5_cc_get_prefix_ops(kcc_context, opt->type_string);
 148         if (ops == NULL)
 149             krb5_err(kcc_context, 1, 0, "krb5_cc_get_prefix_ops");
 150
 151         asprintf(&str, "%s:%s", ops->prefix, opt->cache_string);
 152         if (str == NULL)
 153             krb5_errx(kcc_context, 1, N_("out of memory", ""));
 154
 155         ret = krb5_cc_resolve(kcc_context, str, &id);
 156         if (ret)
 157             krb5_err(kcc_context, 1, ret, "krb5_cc_resolve: %s", str);
 158
 159         free(str);
 160     } else {
 161         krb5_errx(kcc_context, 1, "missing option for kswitch");
 162     }
 163
 164     ret = krb5_cc_switch(kcc_context, id);
 165     if (ret)
 166         krb5_err(kcc_context, 1, ret, "krb5_cc_switch");
 167
 168     return 0;
 169 }