/crypto/heimdal/kcm/cache.c
C | 636 lines | 465 code | 130 blank | 41 comment | 94 complexity | a18e825da16baf1bdf4dc421f516598a MD5 | raw file
- /*
- * Copyright (c) 2005, PADL Software Pty Ltd.
- * 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"
- RCSID("$Id: cache.c 14566 2005-02-06 01:22:49Z lukeh $");
- static HEIMDAL_MUTEX ccache_mutex = HEIMDAL_MUTEX_INITIALIZER;
- static kcm_ccache_data *ccache_head = NULL;
- static unsigned int ccache_nextid = 0;
- char *kcm_ccache_nextid(pid_t pid, uid_t uid, gid_t gid)
- {
- unsigned n;
- char *name;
- HEIMDAL_MUTEX_lock(&ccache_mutex);
- n = ++ccache_nextid;
- HEIMDAL_MUTEX_unlock(&ccache_mutex);
- asprintf(&name, "%d:%u", uid, n);
- return name;
- }
- static krb5_error_code
- kcm_ccache_resolve_internal(krb5_context context,
- const char *name,
- kcm_ccache *ccache)
- {
- kcm_ccache p;
- krb5_error_code ret;
- *ccache = NULL;
- ret = KRB5_FCC_NOFILE;
- HEIMDAL_MUTEX_lock(&ccache_mutex);
- for (p = ccache_head; p != NULL; p = p->next) {
- if ((p->flags & KCM_FLAGS_VALID) == 0)
- continue;
- if (strcmp(p->name, name) == 0) {
- ret = 0;
- break;
- }
- }
- if (ret == 0) {
- kcm_retain_ccache(context, p);
- *ccache = p;
- }
- HEIMDAL_MUTEX_unlock(&ccache_mutex);
- return ret;
- }
- krb5_error_code kcm_debug_ccache(krb5_context context)
- {
- kcm_ccache p;
- for (p = ccache_head; p != NULL; p = p->next) {
- char *cpn = NULL, *spn = NULL;
- int ncreds = 0;
- struct kcm_creds *k;
- if ((p->flags & KCM_FLAGS_VALID) == 0) {
- kcm_log(7, "cache %08x: empty slot");
- continue;
- }
- KCM_ASSERT_VALID(p);
- for (k = p->creds; k != NULL; k = k->next)
- ncreds++;
- if (p->client != NULL)
- krb5_unparse_name(context, p->client, &cpn);
- if (p->server != NULL)
- krb5_unparse_name(context, p->server, &spn);
-
- kcm_log(7, "cache %08x: name %s refcnt %d flags %04x mode %04o "
- "uid %d gid %d client %s server %s ncreds %d",
- p, p->name, p->refcnt, p->flags, p->mode, p->uid, p->gid,
- (cpn == NULL) ? "<none>" : cpn,
- (spn == NULL) ? "<none>" : spn,
- ncreds);
- if (cpn != NULL)
- free(cpn);
- if (spn != NULL)
- free(spn);
- }
- return 0;
- }
- static krb5_error_code
- kcm_ccache_destroy_internal(krb5_context context, const char *name)
- {
- kcm_ccache *p;
- krb5_error_code ret;
- ret = KRB5_FCC_NOFILE;
- HEIMDAL_MUTEX_lock(&ccache_mutex);
- for (p = &ccache_head; *p != NULL; p = &(*p)->next) {
- if (((*p)->flags & KCM_FLAGS_VALID) == 0)
- continue;
- if (strcmp((*p)->name, name) == 0) {
- ret = 0;
- break;
- }
- }
- if (ret)
- goto out;
- kcm_release_ccache(context, p);
- out:
- HEIMDAL_MUTEX_unlock(&ccache_mutex);
- return ret;
- }
- static krb5_error_code
- kcm_ccache_alloc(krb5_context context,
- const char *name,
- kcm_ccache *ccache)
- {
- kcm_ccache slot = NULL, p;
- krb5_error_code ret;
- int new_slot = 0;
- *ccache = NULL;
- /* First, check for duplicates */
- HEIMDAL_MUTEX_lock(&ccache_mutex);
- ret = 0;
- for (p = ccache_head; p != NULL; p = p->next) {
- if (p->flags & KCM_FLAGS_VALID) {
- if (strcmp(p->name, name) == 0) {
- ret = KRB5_CC_WRITE;
- break;
- }
- } else if (slot == NULL)
- slot = p;
- }
- if (ret)
- goto out;
- /*
- * Then try and find an empty slot
- * XXX we need to recycle slots for this to actually do anything
- */
- if (slot == NULL) {
- for (; p != NULL; p = p->next) {
- if ((p->flags & KCM_FLAGS_VALID) == 0) {
- slot = p;
- break;
- }
- }
- if (slot == NULL) {
- slot = (kcm_ccache_data *)malloc(sizeof(*slot));
- if (slot == NULL) {
- ret = KRB5_CC_NOMEM;
- goto out;
- }
- slot->next = ccache_head;
- HEIMDAL_MUTEX_init(&slot->mutex);
- new_slot = 1;
- }
- }
- slot->name = strdup(name);
- if (slot->name == NULL) {
- ret = KRB5_CC_NOMEM;
- goto out;
- }
- slot->refcnt = 1;
- slot->flags = KCM_FLAGS_VALID;
- slot->mode = S_IRUSR | S_IWUSR;
- slot->uid = -1;
- slot->gid = -1;
- slot->client = NULL;
- slot->server = NULL;
- slot->creds = NULL;
- slot->n_cursor = 0;
- slot->cursors = NULL;
- slot->key.keytab = NULL;
- slot->tkt_life = 0;
- slot->renew_life = 0;
- if (new_slot)
- ccache_head = slot;
- *ccache = slot;
- HEIMDAL_MUTEX_unlock(&ccache_mutex);
- return 0;
- out:
- HEIMDAL_MUTEX_unlock(&ccache_mutex);
- if (new_slot && slot != NULL) {
- HEIMDAL_MUTEX_destroy(&slot->mutex);
- free(slot);
- }
- return ret;
- }
- krb5_error_code
- kcm_ccache_remove_creds_internal(krb5_context context,
- kcm_ccache ccache)
- {
- struct kcm_creds *k;
- struct kcm_cursor *c;
- k = ccache->creds;
- while (k != NULL) {
- struct kcm_creds *old;
- krb5_free_cred_contents(context, &k->cred);
- old = k;
- k = k->next;
- free(old);
- }
- ccache->creds = NULL;
- /* remove anything that would have pointed into the creds too */
- ccache->n_cursor = 0;
- c = ccache->cursors;
- while (c != NULL) {
- struct kcm_cursor *old;
- old = c;
- c = c->next;
- free(old);
- }
- ccache->cursors = NULL;
- return 0;
- }
- krb5_error_code
- kcm_ccache_remove_creds(krb5_context context,
- kcm_ccache ccache)
- {
- krb5_error_code ret;
- KCM_ASSERT_VALID(ccache);
- HEIMDAL_MUTEX_lock(&ccache->mutex);
- ret = kcm_ccache_remove_creds_internal(context, ccache);
- HEIMDAL_MUTEX_unlock(&ccache->mutex);
- return ret;
- }
- krb5_error_code
- kcm_zero_ccache_data_internal(krb5_context context,
- kcm_ccache_data *cache)
- {
- if (cache->client != NULL) {
- krb5_free_principal(context, cache->client);
- cache->client = NULL;
- }
- if (cache->server != NULL) {
- krb5_free_principal(context, cache->server);
- cache->server = NULL;
- }
- kcm_ccache_remove_creds_internal(context, cache);
- return 0;
- }
- krb5_error_code
- kcm_zero_ccache_data(krb5_context context,
- kcm_ccache cache)
- {
- krb5_error_code ret;
- KCM_ASSERT_VALID(cache);
- HEIMDAL_MUTEX_lock(&cache->mutex);
- ret = kcm_zero_ccache_data_internal(context, cache);
- HEIMDAL_MUTEX_unlock(&cache->mutex);
- return ret;
- }
- static krb5_error_code
- kcm_free_ccache_data_internal(krb5_context context,
- kcm_ccache_data *cache)
- {
- KCM_ASSERT_VALID(cache);
- if (cache->name != NULL) {
- free(cache->name);
- cache->name = NULL;
- }
- if (cache->flags & KCM_FLAGS_USE_KEYTAB) {
- krb5_kt_close(context, cache->key.keytab);
- cache->key.keytab = NULL;
- } else if (cache->flags & KCM_FLAGS_USE_CACHED_KEY) {
- krb5_free_keyblock_contents(context, &cache->key.keyblock);
- krb5_keyblock_zero(&cache->key.keyblock);
- }
- cache->flags = 0;
- cache->mode = 0;
- cache->uid = -1;
- cache->gid = -1;
- kcm_zero_ccache_data_internal(context, cache);
- cache->tkt_life = 0;
- cache->renew_life = 0;
- cache->next = NULL;
- cache->refcnt = 0;
- HEIMDAL_MUTEX_unlock(&cache->mutex);
- HEIMDAL_MUTEX_destroy(&cache->mutex);
- return 0;
- }
- krb5_error_code
- kcm_retain_ccache(krb5_context context,
- kcm_ccache ccache)
- {
- KCM_ASSERT_VALID(ccache);
- HEIMDAL_MUTEX_lock(&ccache->mutex);
- ccache->refcnt++;
- HEIMDAL_MUTEX_unlock(&ccache->mutex);
- return 0;
- }
- krb5_error_code
- kcm_release_ccache(krb5_context context,
- kcm_ccache *ccache)
- {
- kcm_ccache c = *ccache;
- krb5_error_code ret = 0;
- KCM_ASSERT_VALID(c);
- HEIMDAL_MUTEX_lock(&c->mutex);
- if (c->refcnt == 1) {
- ret = kcm_free_ccache_data_internal(context, c);
- if (ret == 0)
- free(c);
- } else {
- c->refcnt--;
- HEIMDAL_MUTEX_unlock(&c->mutex);
- }
- *ccache = NULL;
- return ret;
- }
- krb5_error_code
- kcm_ccache_gen_new(krb5_context context,
- pid_t pid,
- uid_t uid,
- gid_t gid,
- kcm_ccache *ccache)
- {
- krb5_error_code ret;
- char *name;
- name = kcm_ccache_nextid(pid, uid, gid);
- if (name == NULL) {
- return KRB5_CC_NOMEM;
- }
- ret = kcm_ccache_new(context, name, ccache);
- free(name);
- return ret;
- }
- krb5_error_code
- kcm_ccache_new(krb5_context context,
- const char *name,
- kcm_ccache *ccache)
- {
- krb5_error_code ret;
- ret = kcm_ccache_alloc(context, name, ccache);
- if (ret == 0) {
- /*
- * one reference is held by the linked list,
- * one by the caller
- */
- kcm_retain_ccache(context, *ccache);
- }
- return ret;
- }
- krb5_error_code
- kcm_ccache_resolve(krb5_context context,
- const char *name,
- kcm_ccache *ccache)
- {
- krb5_error_code ret;
- ret = kcm_ccache_resolve_internal(context, name, ccache);
- return ret;
- }
- krb5_error_code
- kcm_ccache_destroy(krb5_context context,
- const char *name)
- {
- krb5_error_code ret;
- ret = kcm_ccache_destroy_internal(context, name);
- return ret;
- }
- krb5_error_code
- kcm_ccache_destroy_if_empty(krb5_context context,
- kcm_ccache ccache)
- {
- krb5_error_code ret;
- KCM_ASSERT_VALID(ccache);
-
- if (ccache->creds == NULL) {
- ret = kcm_ccache_destroy_internal(context, ccache->name);
- } else
- ret = 0;
- return ret;
- }
- krb5_error_code
- kcm_ccache_store_cred(krb5_context context,
- kcm_ccache ccache,
- krb5_creds *creds,
- int copy)
- {
- krb5_error_code ret;
- krb5_creds *tmp;
- KCM_ASSERT_VALID(ccache);
-
- HEIMDAL_MUTEX_lock(&ccache->mutex);
- ret = kcm_ccache_store_cred_internal(context, ccache, creds, copy, &tmp);
- HEIMDAL_MUTEX_unlock(&ccache->mutex);
- return ret;
- }
- krb5_error_code
- kcm_ccache_store_cred_internal(krb5_context context,
- kcm_ccache ccache,
- krb5_creds *creds,
- int copy,
- krb5_creds **credp)
- {
- struct kcm_creds **c;
- krb5_error_code ret;
- for (c = &ccache->creds; *c != NULL; c = &(*c)->next)
- ;
- *c = (struct kcm_creds *)malloc(sizeof(struct kcm_creds));
- if (*c == NULL) {
- return KRB5_CC_NOMEM;
- }
- *credp = &(*c)->cred;
- if (copy) {
- ret = krb5_copy_creds_contents(context, creds, *credp);
- if (ret) {
- free(*c);
- *c = NULL;
- }
- } else {
- **credp = *creds;
- ret = 0;
- }
- (*c)->next = NULL;
- return ret;
- }
- static void
- remove_cred(krb5_context context,
- struct kcm_creds **c)
- {
- struct kcm_creds *cred;
- cred = *c;
- *c = cred->next;
- krb5_free_cred_contents(context, &cred->cred);
- free(cred);
- }
- krb5_error_code
- kcm_ccache_remove_cred_internal(krb5_context context,
- kcm_ccache ccache,
- krb5_flags whichfields,
- const krb5_creds *mcreds)
- {
- krb5_error_code ret;
- struct kcm_creds **c;
- ret = KRB5_CC_NOTFOUND;
- for (c = &ccache->creds; *c != NULL; c = &(*c)->next) {
- if (krb5_compare_creds(context, whichfields, mcreds, &(*c)->cred)) {
- remove_cred(context, c);
- ret = 0;
- }
- }
- return ret;
- }
- krb5_error_code
- kcm_ccache_remove_cred(krb5_context context,
- kcm_ccache ccache,
- krb5_flags whichfields,
- const krb5_creds *mcreds)
- {
- krb5_error_code ret;
- KCM_ASSERT_VALID(ccache);
- HEIMDAL_MUTEX_lock(&ccache->mutex);
- ret = kcm_ccache_remove_cred_internal(context, ccache, whichfields, mcreds);
- HEIMDAL_MUTEX_unlock(&ccache->mutex);
- return ret;
- }
- krb5_error_code
- kcm_ccache_retrieve_cred_internal(krb5_context context,
- kcm_ccache ccache,
- krb5_flags whichfields,
- const krb5_creds *mcreds,
- krb5_creds **creds)
- {
- krb5_boolean match;
- struct kcm_creds *c;
- krb5_error_code ret;
- memset(creds, 0, sizeof(*creds));
- ret = KRB5_CC_END;
- match = FALSE;
- for (c = ccache->creds; c != NULL; c = c->next) {
- match = krb5_compare_creds(context, whichfields, mcreds, &c->cred);
- if (match)
- break;
- }
- if (match) {
- ret = 0;
- *creds = &c->cred;
- }
- return ret;
- }
- krb5_error_code
- kcm_ccache_retrieve_cred(krb5_context context,
- kcm_ccache ccache,
- krb5_flags whichfields,
- const krb5_creds *mcreds,
- krb5_creds **credp)
- {
- krb5_error_code ret;
- KCM_ASSERT_VALID(ccache);
-
- HEIMDAL_MUTEX_lock(&ccache->mutex);
- ret = kcm_ccache_retrieve_cred_internal(context, ccache,
- whichfields, mcreds, credp);
- HEIMDAL_MUTEX_unlock(&ccache->mutex);
- return ret;
- }