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/*
* Copyright (c) 2005, PADL Software Pty Ltd.
* All rights reserved.
*
* Portions Copyright (c) 2009 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. 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.
*
* 3. Neither the name of PADL Software nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY PADL SOFTWARE 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 PADL SOFTWARE 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.
*/
#include "kcm_locl.h"
#include <pwd.h>
krb5_error_code
kcm_ccache_resolve_client(krb5_context context,
kcm_client *client,
kcm_operation opcode,
const char *name,
kcm_ccache *ccache)
{
krb5_error_code ret;
const char *estr;
ret = kcm_ccache_resolve(context, name, ccache);
if (ret) {
char *uid = NULL;
/*
* Both MIT and Heimdal are unable to, in krb5_cc_default(), call to
* KCM (or CCAPI, or LSA, or...) to get the user's default ccache name
* in their collection. Instead, the default ccache name is obtained
* in a static way, and for KCM that's "%{UID}". When we
* krb5_cc_switch(), we simply maintain a pointer to the name of the
* ccache that was made the default, but klist can't make use of this
* because krb5_cc_default() can't.
*
* The solution here is to first try resolving the ccache name given by
* the client, and if that fails but the name happens to be what would
* be the library's default KCM ccache name for that user, then try
* resolving it through the default ccache name pointer saved at switch
* time.
*/
if (asprintf(&uid, "%llu", (unsigned long long)client->uid) == -1 ||
uid == NULL)
return ENOMEM;
if (strcmp(name, uid) == 0) {
struct kcm_default_cache *c;
for (c = default_caches; c != NULL; c = c->next) {
if (kcm_is_same_session(client, c->uid, c->session)) {
if (strcmp(c->name, name) != 0) {
ret = kcm_ccache_resolve(context, c->name, ccache);
break;
}
}
}
}
free(uid);
}
if (ret) {
estr = krb5_get_error_message(context, ret);
kcm_log(1, "Failed to resolve cache %s: %s", name, estr);
krb5_free_error_message(context, estr);
return ret;
}
ret = kcm_access(context, client, opcode, *ccache);
if (ret) {
ret = KRB5_FCC_NOFILE; /* don't disclose */
kcm_release_ccache(context, *ccache);
}
return ret;
}
krb5_error_code
kcm_ccache_destroy_client(krb5_context context,
kcm_client *client,
const char *name)
{
krb5_error_code ret;
kcm_ccache ccache;
const char *estr;
ret = kcm_ccache_resolve(context, name, &ccache);
if (ret) {
estr = krb5_get_error_message(context, ret);
kcm_log(1, "Failed to resolve cache %s: %s", name, estr);
krb5_free_error_message(context, estr);
return ret;
}
ret = kcm_access(context, client, KCM_OP_DESTROY, ccache);
kcm_cleanup_events(context, ccache);
kcm_release_ccache(context, ccache);
if (ret)
return ret;
return kcm_ccache_destroy(context, name);
}
krb5_error_code
kcm_ccache_new_client(krb5_context context,
kcm_client *client,
const char *name,
kcm_ccache *ccache_p)
{
krb5_error_code ret;
kcm_ccache ccache;
const char *estr;
/* We insist the ccache name starts with UID or UID: */
if (name_constraints != 0) {
char prefix[64];
size_t prefix_len;
int bad = 1;
snprintf(prefix, sizeof(prefix), "%ld:", (long)client->uid);
prefix_len = strlen(prefix);
if (strncmp(name, prefix, prefix_len) == 0)
bad = 0;
else {
prefix[prefix_len - 1] = '\0';
if (strcmp(name, prefix) == 0)
bad = 0;
}
/* Allow root to create badly-named ccaches */
if (bad && !CLIENT_IS_ROOT(client))
return KRB5_CC_BADNAME;
}
ret = kcm_ccache_resolve(context, name, &ccache);
if (ret == 0) {
if ((ccache->uid != client->uid ||
ccache->gid != client->gid) && !CLIENT_IS_ROOT(client))
return KRB5_FCC_PERM;
} else if (ret != KRB5_FCC_NOFILE && !(CLIENT_IS_ROOT(client) && ret == KRB5_FCC_PERM)) {
return ret;
}
if (ret == KRB5_FCC_NOFILE) {
ret = kcm_ccache_new(context, name, &ccache);
if (ret) {
estr = krb5_get_error_message(context, ret);
kcm_log(1, "Failed to initialize cache %s: %s", name, estr);
krb5_free_error_message(context, estr);
return ret;
}
/* bind to current client */
ccache->uid = client->uid;
ccache->gid = client->gid;
ccache->session = client->session;
} else {
ret = kcm_zero_ccache_data(context, ccache);
if (ret) {
estr = krb5_get_error_message(context, ret);
kcm_log(1, "Failed to empty cache %s: %s", name, estr);
krb5_free_error_message(context, estr);
kcm_release_ccache(context, ccache);
return ret;
}
kcm_cleanup_events(context, ccache);
}
ret = kcm_access(context, client, KCM_OP_INITIALIZE, ccache);
if (ret) {
kcm_release_ccache(context, ccache);
kcm_ccache_destroy(context, name);
return ret;
}
/*
* Finally, if the user is root and the cache was created under
* another user's name, chown the cache to that user and their
* default gid.
*/
if (CLIENT_IS_ROOT(client)) {
unsigned long uid;
int matches = sscanf(name,"%ld:",&uid);
if (matches == 0)
matches = sscanf(name,"%ld",&uid);
if (matches == 1) {
struct passwd *pwd = getpwuid(uid);
if (pwd != NULL) {
gid_t gid = pwd->pw_gid;
kcm_chown(context, client, ccache, uid, gid);
}
}
}
*ccache_p = ccache;
return 0;
}
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