static krb5_error_code
kcm_op_get_ntlm_user_list(krb5_context context,
kcm_client *client,
kcm_operation opcode,
krb5_storage *request,
krb5_storage *response)
{
struct kcm_ntlm_cred *c;
krb5_error_code ret;
for (c = ntlm_head; c != NULL; c = c->next) {
if (!kcm_is_same_session(client, c->uid, c->session))
continue;
ret = krb5_store_uint32(response, 1);
if (ret)
return ret;
ret = krb5_store_stringz(response, c->user);
if (ret)
return ret;
ret = krb5_store_stringz(response, c->domain);
if (ret)
return ret;
}
return krb5_store_uint32(response, 0);
}
static krb5_error_code
kcm_op_get_default_cache(krb5_context context,
kcm_client *client,
kcm_operation opcode,
krb5_storage *request,
krb5_storage *response)
{
struct kcm_default_cache *c;
krb5_error_code ret;
const char *name = NULL;
char *n = NULL;
KCM_LOG_REQUEST(context, client, opcode);
for (c = default_caches; c != NULL; c = c->next) {
if (kcm_is_same_session(client, c->uid, c->session)) {
name = c->name;
break;
}
}
if (name == NULL)
name = n = kcm_ccache_first_name(client);
if (name == NULL) {
asprintf(&n, "%d", (int)client->uid);
name = n;
}
if (name == NULL)
return ENOMEM;
ret = krb5_store_stringz(response, name);
if (n)
free(n);
return ret;
}
static struct kcm_ntlm_cred *
find_ntlm_cred(const char *user, const char *domain, kcm_client *client)
{
struct kcm_ntlm_cred *c;
for (c = ntlm_head; c != NULL; c = c->next)
if ((user[0] == '\0' || strcmp(user, c->user) == 0) &&
(domain == NULL || strcmp(domain, c->domain) == 0) &&
kcm_is_same_session(client, c->uid, c->session))
return c;
return NULL;
}
static void
kcm_drop_default_cache(krb5_context context, kcm_client *client, char *name)
{
struct kcm_default_cache **c;
for (c = &default_caches; *c != NULL; c = &(*c)->next) {
if (!kcm_is_same_session(client, (*c)->uid, (*c)->session))
continue;
if (strcmp((*c)->name, name) == 0) {
struct kcm_default_cache *h = *c;
*c = (*c)->next;
free(h->name);
free(h);
break;
}
}
}
char *
kcm_ccache_first_name(kcm_client *client)
{
kcm_ccache p;
char *name = NULL;
HEIMDAL_MUTEX_lock(&ccache_mutex);
for (p = ccache_head; p != NULL; p = p->next) {
if (kcm_is_same_session(client, p->uid, p->session))
break;
}
if (p)
name = strdup(p->name);
HEIMDAL_MUTEX_unlock(&ccache_mutex);
return name;
}
static krb5_error_code
kcm_op_set_default_cache(krb5_context context,
kcm_client *client,
kcm_operation opcode,
krb5_storage *request,
krb5_storage *response)
{
struct kcm_default_cache *c;
krb5_error_code ret;
char *name;
ret = krb5_ret_stringz(request, &name);
if (ret)
return ret;
KCM_LOG_REQUEST_NAME(context, client, opcode, name);
for (c = default_caches; c != NULL; c = c->next) {
if (kcm_is_same_session(client, c->uid, c->session))
break;
}
if (c == NULL) {
c = malloc(sizeof(*c));
if (c == NULL)
return ENOMEM;
c->session = client->session;
c->uid = client->uid;
c->name = strdup(name);
c->next = default_caches;
default_caches = c;
} else {
free(c->name);
c->name = strdup(name);
}
return 0;
}
static krb5_error_code
kcm_op_del_ntlm_cred(krb5_context context,
kcm_client *client,
kcm_operation opcode,
krb5_storage *request,
krb5_storage *response)
{
struct kcm_ntlm_cred **cp, *c;
char *user = NULL, *domain = NULL;
krb5_error_code ret;
ret = krb5_ret_stringz(request, &user);
if (ret)
goto error;
ret = krb5_ret_stringz(request, &domain);
if (ret)
goto error;
for (cp = &ntlm_head; *cp != NULL; cp = &(*cp)->next) {
if (strcmp(user, (*cp)->user) == 0 && strcmp(domain, (*cp)->domain) == 0 &&
kcm_is_same_session(client, (*cp)->uid, (*cp)->session))
{
c = *cp;
*cp = c->next;
free_cred(c);
break;
}
}
error:
free(user);
free(domain);
return ret;
}
krb5_error_code
kcm_access(krb5_context context,
kcm_client *client,
kcm_operation opcode,
kcm_ccache ccache)
{
int read_p = 0;
int write_p = 0;
uint16_t mask;
krb5_error_code ret;
KCM_ASSERT_VALID(ccache);
switch (opcode) {
case KCM_OP_INITIALIZE:
case KCM_OP_DESTROY:
case KCM_OP_STORE:
case KCM_OP_REMOVE_CRED:
case KCM_OP_SET_FLAGS:
case KCM_OP_CHOWN:
case KCM_OP_CHMOD:
case KCM_OP_GET_INITIAL_TICKET:
case KCM_OP_GET_TICKET:
case KCM_OP_MOVE_CACHE:
case KCM_OP_SET_DEFAULT_CACHE:
case KCM_OP_SET_KDC_OFFSET:
write_p = 1;
read_p = 0;
break;
case KCM_OP_NOOP:
case KCM_OP_GET_NAME:
case KCM_OP_RESOLVE:
case KCM_OP_GEN_NEW:
case KCM_OP_RETRIEVE:
case KCM_OP_GET_PRINCIPAL:
case KCM_OP_GET_CRED_UUID_LIST:
case KCM_OP_GET_CRED_BY_UUID:
case KCM_OP_GET_CACHE_UUID_LIST:
case KCM_OP_GET_CACHE_BY_UUID:
case KCM_OP_GET_DEFAULT_CACHE:
case KCM_OP_GET_KDC_OFFSET:
write_p = 0;
read_p = 1;
break;
default:
ret = KRB5_FCC_PERM;
goto out;
}
if (ccache->flags & KCM_FLAGS_OWNER_IS_SYSTEM) {
/* System caches cannot be reinitialized or destroyed by users */
if (opcode == KCM_OP_INITIALIZE ||
opcode == KCM_OP_DESTROY ||
opcode == KCM_OP_REMOVE_CRED ||
opcode == KCM_OP_MOVE_CACHE) {
ret = KRB5_FCC_PERM;
goto out;
}
/* Let root always read system caches */
if (CLIENT_IS_ROOT(client)) {
ret = 0;
goto out;
}
}
/* start out with "other" mask */
mask = S_IROTH|S_IWOTH;
/* root can do anything */
if (CLIENT_IS_ROOT(client)) {
if (read_p)
mask |= S_IRUSR|S_IRGRP|S_IROTH;
if (write_p)
mask |= S_IWUSR|S_IWGRP|S_IWOTH;
}
/* same session same as owner */
if (kcm_is_same_session(client, ccache->uid, ccache->session)) {
if (read_p)
mask |= S_IROTH;
if (write_p)
mask |= S_IWOTH;
}
/* owner */
if (client->uid == ccache->uid) {
if (read_p)
mask |= S_IRUSR;
if (write_p)
mask |= S_IWUSR;
}
/* group */
if (client->gid == ccache->gid) {
if (read_p)
mask |= S_IRGRP;
if (write_p)
mask |= S_IWGRP;
}
ret = (ccache->mode & mask) ? 0 : KRB5_FCC_PERM;
out:
if (ret) {
kcm_log(2, "Process %d is not permitted to call %s on cache %s",
client->pid, kcm_op2string(opcode), ccache->name);
}
return ret;
}
