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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* t_cc_config.c: read and write configuration items in ccaches */
/*
* Copyright (C) 2012 by the Massachusetts Institute of Technology.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* A test helper which either reads or writes a configuration setting from or
* to a credential cache, optionally for a specified server principal name.
*/
#include <k5-int.h>
#include "int-proto.h"
static void
bail_on_err(krb5_context context, const char *msg, krb5_error_code code)
{
const char *errmsg;
if (code) {
errmsg = krb5_get_error_message(context, code);
printf("%s: %s\n", msg, errmsg);
krb5_free_error_message(context, errmsg);
exit(1);
}
}
/*
* The default unset code path depends on the underlying ccache implementation
* knowing how to remove a credential, which most types don't actually support,
* so we have to jump through some hoops to ensure that when we set a value for
* a key, it'll be the only value for that key that'll be found later. The
* ccache portions of libkrb5 will currently duplicate some of the actual
* tickets.
*/
static void
unset_config(krb5_context context, krb5_ccache ccache,
krb5_principal server, const char *key)
{
krb5_ccache tmp1, tmp2;
krb5_cc_cursor cursor;
krb5_creds mcreds, creds;
memset(&mcreds, 0, sizeof(mcreds));
memset(&creds, 0, sizeof(creds));
bail_on_err(context, "Error while deriving configuration principal names",
k5_build_conf_principals(context, ccache, server, key,
&mcreds));
bail_on_err(context, "Error resolving first in-memory ccache",
krb5_cc_resolve(context, "MEMORY:tmp1", &tmp1));
bail_on_err(context, "Error initializing first in-memory ccache",
krb5_cc_initialize(context, tmp1, mcreds.client));
bail_on_err(context, "Error resolving second in-memory ccache",
krb5_cc_resolve(context, "MEMORY:tmp2", &tmp2));
bail_on_err(context, "Error initializing second in-memory ccache",
krb5_cc_initialize(context, tmp2, mcreds.client));
bail_on_err(context, "Error copying credentials to first in-memory ccache",
krb5_cc_copy_creds(context, ccache, tmp1));
bail_on_err(context, "Error starting traversal of first in-memory ccache",
krb5_cc_start_seq_get(context, tmp1, &cursor));
while (krb5_cc_next_cred(context, tmp1, &cursor, &creds) == 0) {
if (!krb5_is_config_principal(context, creds.server) ||
!krb5_principal_compare(context, mcreds.server, creds.server) ||
!krb5_principal_compare(context, mcreds.client, creds.client)) {
bail_on_err(context,
"Error storing non-config item to in-memory ccache",
krb5_cc_store_cred(context, tmp2, &creds));
}
}
bail_on_err(context, "Error ending traversal of first in-memory ccache",
krb5_cc_end_seq_get(context, tmp1, &cursor));
bail_on_err(context, "Error clearing ccache",
krb5_cc_initialize(context, ccache, mcreds.client));
bail_on_err(context, "Error storing creds to the ccache",
krb5_cc_copy_creds(context, tmp2, ccache));
bail_on_err(context, "Error cleaning up first in-memory ccache",
krb5_cc_destroy(context, tmp1));
bail_on_err(context, "Error cleaning up second in-memory ccache",
krb5_cc_destroy(context, tmp2));
}
int
main(int argc, char **argv)
{
krb5_context context;
krb5_principal server;
krb5_ccache ccache;
krb5_data data;
krb5_error_code ret;
char *perr;
int c;
unsigned int i;
bail_on_err(NULL, "Error initializing Kerberos library",
krb5_init_context(&context));
bail_on_err(context, "Error getting location of default ccache",
krb5_cc_default(context, &ccache));
server = NULL;
while ((c = getopt(argc, argv, "p:")) != -1) {
switch (c) {
case 'p':
if (asprintf(&perr, "Error parsing principal name \"%s\"",
optarg) < 0)
perr = "Error parsing principal name";
bail_on_err(context, perr,
krb5_parse_name(context, optarg, &server));
break;
}
}
if (argc - optind < 1 || argc - optind > 2) {
fprintf(stderr, "Usage: %s [-p principal] key [value]\n", argv[0]);
return 1;
}
memset(&data, 0, sizeof(data));
if (argc - optind == 2) {
unset_config(context, ccache, server, argv[optind]);
data = string2data(argv[optind + 1]);
bail_on_err(context, "Error adding configuration data to ccache",
krb5_cc_set_config(context, ccache, server, argv[optind],
&data));
} else {
ret = krb5_cc_get_config(context, ccache, server, argv[optind], &data);
if (ret == 0) {
for (i = 0; i < data.length; i++)
putc((unsigned int)data.data[i], stdout);
}
}
krb5_free_principal(context, server);
krb5_cc_close(context, ccache);
krb5_free_context(context);
return 0;
}
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