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/*
* Copyright (C) 2016 Red Hat Inc.
*
* 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.
* * The names of contributors to this software may not be
* used to endorse or promote products derived from this
* software without specific prior written permission.
*
* 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 OWNER 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.
*
* Author: Daiki Ueno
*/
#include "config.h"
#include "client.h"
#include "compat.h"
#include "library.h"
#include "path.h"
#include "rpc.h"
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
typedef struct _State {
p11_virtual virt;
p11_rpc_transport *rpc;
CK_FUNCTION_LIST *wrapped;
struct _State *next;
} State;
static State *all_instances = NULL;
static CK_RV
get_runtime_directory (char **directoryp)
{
const char *envvar;
static const char * const bases[] = { "/run", "/var/run", NULL };
char prefix[13 + 1 + 20 + 6 + 1];
char *directory;
uid_t uid;
struct stat sb;
struct passwd pwbuf, *pw;
char buf[1024];
int i;
/* We can't always assume the XDG_RUNTIME_DIR envvar here,
* because the PKCS#11 module can be loaded by a program that
* calls setuid(). */
envvar = secure_getenv ("XDG_RUNTIME_DIR");
if (envvar != NULL && envvar[0] != '\0') {
directory = strdup (envvar);
if (!directory)
return CKR_HOST_MEMORY;
*directoryp = directory;
return CKR_OK;
}
uid = getuid ();
for (i = 0; bases[i] != NULL; i++) {
snprintf (prefix, sizeof prefix, "%s/user/%u",
bases[i], (unsigned int) uid);
if (stat (prefix, &sb) != -1 && S_ISDIR (sb.st_mode)) {
directory = strdup (prefix);
if (!directory)
return CKR_HOST_MEMORY;
*directoryp = directory;
return CKR_OK;
}
}
/* We can't use /run/user/<UID>, fallback to ~/.cache. */
envvar = secure_getenv ("XDG_CACHE_HOME");
if (envvar != NULL && envvar[0] != '\0') {
directory = strdup (envvar);
if (!directory)
return CKR_HOST_MEMORY;
*directoryp = directory;
return CKR_OK;
}
if (getpwuid_r (uid, &pwbuf, buf, sizeof buf, &pw) < 0 ||
pw == NULL || pw->pw_dir == NULL || *pw->pw_dir != '/')
return CKR_GENERAL_ERROR;
if (asprintf (&directory, "%s/.cache", pw->pw_dir) < 0)
return CKR_HOST_MEMORY;
*directoryp = directory;
return CKR_OK;
}
static CK_RV
get_server_address (char **addressp)
{
const char *envvar;
char *path;
char *encoded;
char *address;
char *directory;
int ret;
CK_RV rv;
envvar = secure_getenv ("P11_KIT_SERVER_ADDRESS");
if (envvar != NULL && envvar[0] != '\0') {
address = strdup (envvar);
if (!address)
return CKR_HOST_MEMORY;
*addressp = address;
return CKR_OK;
}
rv = get_runtime_directory (&directory);
if (rv != CKR_OK)
return rv;
ret = asprintf (&path, "%s/p11-kit/pkcs11", directory);
free (directory);
if (ret < 0)
return CKR_HOST_MEMORY;
encoded = p11_path_encode (path);
free (path);
if (!encoded)
return CKR_HOST_MEMORY;
ret = asprintf (&address, "unix:path=%s", encoded);
free (encoded);
if (ret < 0)
return CKR_HOST_MEMORY;
*addressp = address;
return CKR_OK;
}
#ifdef OS_WIN32
__declspec(dllexport)
#endif
CK_RV
C_GetFunctionList (CK_FUNCTION_LIST_PTR_PTR list)
{
char *address = NULL;
State *state;
CK_FUNCTION_LIST_PTR module = NULL;
CK_RV rv = CKR_OK;
p11_library_init_once ();
p11_lock ();
rv = get_server_address (&address);
if (rv == CKR_OK) {
state = calloc (1, sizeof (State));
if (!state)
rv = CKR_HOST_MEMORY;
}
if (rv == CKR_OK) {
state->rpc = p11_rpc_transport_new (&state->virt,
address,
"client");
if (!state->rpc)
rv = CKR_GENERAL_ERROR;
}
if (rv == CKR_OK) {
module = p11_virtual_wrap (&state->virt, free);
if (!module)
rv = CKR_GENERAL_ERROR;
}
if (rv == CKR_OK) {
*list = module;
state->wrapped = module;
state->next = all_instances;
all_instances = state;
}
p11_unlock ();
free (address);
return rv;
}
void
p11_client_module_cleanup (void)
{
State *state, *next;
state = all_instances;
all_instances = NULL;
for (; state != NULL; state = next) {
next = state->next;
p11_virtual_unwrap (state->wrapped);
p11_rpc_transport_free (state->rpc);
}
}
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