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strongswan/src/charon/plugins/stroke/stroke_cred.c

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/*
* Copyright (C) 2008 Martin Willi
* Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* $Id$
*/
#include "stroke_cred.h"
#include "stroke_shared_key.h"
#include <sys/stat.h>
#include <credentials/certificates/x509.h>
#include <credentials/certificates/crl.h>
#include <credentials/certificates/ac.h>
#include <utils/linked_list.h>
#include <utils/mutex.h>
#include <utils/lexparser.h>
#include <asn1/ttodata.h>
#include <asn1/pem.h>
#include <daemon.h>
/* configuration directories and files */
#define CONFIG_DIR IPSEC_CONFDIR
#define IPSEC_D_DIR CONFIG_DIR "/ipsec.d"
#define PRIVATE_KEY_DIR IPSEC_D_DIR "/private"
#define CERTIFICATE_DIR IPSEC_D_DIR "/certs"
#define CA_CERTIFICATE_DIR IPSEC_D_DIR "/cacerts"
#define AA_CERTIFICATE_DIR IPSEC_D_DIR "/aacerts"
#define ATTR_CERTIFICATE_DIR IPSEC_D_DIR "/acerts"
#define OCSP_CERTIFICATE_DIR IPSEC_D_DIR "/ocspcerts"
#define CRL_DIR IPSEC_D_DIR "/crls"
#define SECRETS_FILE CONFIG_DIR "/ipsec.secrets"
typedef struct private_stroke_cred_t private_stroke_cred_t;
/**
* private data of stroke_cred
*/
struct private_stroke_cred_t {
/**
* public functions
*/
stroke_cred_t public;
/**
* list of trusted peer/signer/CA certificates (certificate_t)
*/
linked_list_t *certs;
/**
* list of shared secrets (private_shared_key_t)
*/
linked_list_t *shared;
/**
* list of private keys (private_key_t)
*/
linked_list_t *private;
/**
* mutex to lock lists above
*/
mutex_t *mutex;
/**
* cache CRLs to disk?
*/
bool cachecrl;
};
/**
* data to pass to various filters
*/
typedef struct {
private_stroke_cred_t *this;
identification_t *id;
} id_data_t;
/**
* destroy id enumerator data and unlock list
*/
static void id_data_destroy(id_data_t *data)
{
data->this->mutex->unlock(data->this->mutex);
free(data);
}
/**
* filter function for private key enumerator
*/
static bool private_filter(id_data_t *data,
private_key_t **in, private_key_t **out)
{
identification_t *candidate;
if (data->id == NULL)
{
*out = *in;
return TRUE;
}
candidate = (*in)->get_id(*in, data->id->get_type(data->id));
if (candidate && data->id->equals(data->id, candidate))
{
*out = *in;
return TRUE;
}
return FALSE;
}
/**
* Implements credential_set_t.create_private_enumerator
*/
static enumerator_t* create_private_enumerator(private_stroke_cred_t *this,
key_type_t type, identification_t *id)
{
id_data_t *data;
if (type != KEY_RSA && type != KEY_ANY)
{ /* we only have RSA keys */
return NULL;
}
data = malloc_thing(id_data_t);
data->this = this;
data->id = id;
this->mutex->lock(this->mutex);
return enumerator_create_filter(this->private->create_enumerator(this->private),
(void*)private_filter, data,
(void*)id_data_destroy);
}
/**
* filter function for certs enumerator
*/
static bool certs_filter(id_data_t *data, certificate_t **in, certificate_t **out)
{
public_key_t *public;
identification_t *candidate;
certificate_t *cert = *in;
if (cert->get_type(cert) == CERT_X509_CRL)
{
return FALSE;
}
if (data->id == NULL || cert->has_subject(cert, data->id))
{
*out = *in;
return TRUE;
}
public = (cert)->get_public_key(cert);
if (public)
{
candidate = public->get_id(public, data->id->get_type(data->id));
if (candidate && data->id->equals(data->id, candidate))
{
public->destroy(public);
*out = *in;
return TRUE;
}
public->destroy(public);
}
return FALSE;
}
/**
* filter function for crl enumerator
*/
static bool crl_filter(id_data_t *data, certificate_t **in, certificate_t **out)
{
certificate_t *cert = *in;
if (cert->get_type(cert) != CERT_X509_CRL)
{
return FALSE;
}
if (data->id == NULL || cert->has_issuer(cert, data->id))
{
*out = *in;
return TRUE;
}
return FALSE;
}
/**
* Implements credential_set_t.create_cert_enumerator
*/
static enumerator_t* create_cert_enumerator(private_stroke_cred_t *this,
certificate_type_t cert, key_type_t key,
identification_t *id, bool trusted)
{
id_data_t *data;
if (cert == CERT_X509_CRL)
{
if (trusted)
{
return NULL;
}
data = malloc_thing(id_data_t);
data->this = this;
data->id = id;
this->mutex->lock(this->mutex);
return enumerator_create_filter(this->certs->create_enumerator(this->certs),
(void*)crl_filter, data,
(void*)id_data_destroy);
}
if (cert != CERT_X509 && cert != CERT_ANY)
{ /* we only have X509 certificates. TODO: ACs? */
return NULL;
}
if (key != KEY_RSA && key != KEY_ANY)
{ /* we only have RSA keys */
return NULL;
}
data = malloc_thing(id_data_t);
data->this = this;
data->id = id;
this->mutex->lock(this->mutex);
return enumerator_create_filter(this->certs->create_enumerator(this->certs),
(void*)certs_filter, data,
(void*)id_data_destroy);
}
typedef struct {
private_stroke_cred_t *this;
identification_t *me;
identification_t *other;
shared_key_type_t type;
} shared_data_t;
/**
* free shared key enumerator data and unlock list
*/
static void shared_data_destroy(shared_data_t *data)
{
data->this->mutex->unlock(data->this->mutex);
free(data);
}
/**
* filter function for certs enumerator
*/
static bool shared_filter(shared_data_t *data,
stroke_shared_key_t **in, shared_key_t **out,
void **unused1, id_match_t *me,
void **unused2, id_match_t *other)
{
id_match_t my_match, other_match;
stroke_shared_key_t *stroke = *in;
shared_key_t *shared = &stroke->shared;
if (data->type != SHARED_ANY && shared->get_type(shared) != data->type)
{
return FALSE;
}
my_match = stroke->has_owner(stroke, data->me);
other_match = stroke->has_owner(stroke, data->other);
if (!my_match && !other_match)
{
return FALSE;
}
*out = shared;
if (me)
{
*me = my_match;
}
if (other)
{
*other = other_match;
}
return TRUE;
}
/**
* Implements credential_set_t.create_shared_enumerator
*/
static enumerator_t* create_shared_enumerator(private_stroke_cred_t *this,
shared_key_type_t type, identification_t *me,
identification_t *other)
{
shared_data_t *data = malloc_thing(shared_data_t);
data->this = this;
data->me = me;
data->other = other;
data->type = type;
this->mutex->lock(this->mutex);
return enumerator_create_filter(this->shared->create_enumerator(this->shared),
(void*)shared_filter, data,
(void*)shared_data_destroy);
}
/**
* Add a certificate to chain
*/
static certificate_t* add_cert(private_stroke_cred_t *this, certificate_t *cert)
{
certificate_t *current;
enumerator_t *enumerator;
bool new = TRUE;
this->mutex->lock(this->mutex);
enumerator = this->certs->create_enumerator(this->certs);
while (enumerator->enumerate(enumerator, (void**)&current))
{
if (current->equals(current, cert))
{
/* cert already in queue */
cert->destroy(cert);
cert = current;
new = FALSE;
break;
}
}
enumerator->destroy(enumerator);
if (new)
{
this->certs->insert_last(this->certs, cert);
}
this->mutex->unlock(this->mutex);
return cert;
}
/**
* Implementation of stroke_cred_t.load_ca.
*/
static certificate_t* load_ca(private_stroke_cred_t *this, char *filename)
{
certificate_t *cert;
char path[PATH_MAX];
if (*filename == '/')
{
snprintf(path, sizeof(path), "%s", filename);
}
else
{
snprintf(path, sizeof(path), "%s/%s", CA_CERTIFICATE_DIR, filename);
}
cert = lib->creds->create(lib->creds,
CRED_CERTIFICATE, CERT_X509,
BUILD_FROM_FILE, path,
BUILD_X509_FLAG, X509_CA,
BUILD_END);
if (cert)
{
return (certificate_t*)add_cert(this, cert);
}
return NULL;
}
/**
* Add X.509 CRL to chain
*/
static bool add_crl(private_stroke_cred_t *this, crl_t* crl)
{
certificate_t *current, *cert = &crl->certificate;
enumerator_t *enumerator;
bool new = TRUE, found = FALSE;
this->mutex->lock(this->mutex);
enumerator = this->certs->create_enumerator(this->certs);
while (enumerator->enumerate(enumerator, (void**)&current))
{
if (current->get_type(current) == CERT_X509_CRL)
{
crl_t *crl_c = (crl_t*)current;
identification_t *authkey = crl->get_authKeyIdentifier(crl);
identification_t *authkey_c = crl_c->get_authKeyIdentifier(crl_c);
/* if compare authorityKeyIdentifiers if available */
if (authkey != NULL && authkey_c != NULL &&
authkey->equals(authkey, authkey_c))
{
found = TRUE;
}
else
{
identification_t *issuer = cert->get_issuer(cert);
identification_t *issuer_c = current->get_issuer(current);
/* otherwise compare issuer distinguished names */
if (issuer->equals(issuer, issuer_c))
{
found = TRUE;
}
}
if (found)
{
new = cert->is_newer(cert, current);
if (new)
{
this->certs->remove_at(this->certs, enumerator);
}
else
{
cert->destroy(cert);
}
break;
}
}
}
enumerator->destroy(enumerator);
if (new)
{
this->certs->insert_last(this->certs, cert);
}
this->mutex->unlock(this->mutex);
return new;
}
/**
* Implementation of stroke_cred_t.load_peer.
*/
static certificate_t* load_peer(private_stroke_cred_t *this, char *filename)
{
certificate_t *cert;
char path[PATH_MAX];
if (*filename == '/')
{
snprintf(path, sizeof(path), "%s", filename);
}
else
{
snprintf(path, sizeof(path), "%s/%s", CERTIFICATE_DIR, filename);
}
cert = lib->creds->create(lib->creds,
CRED_CERTIFICATE, CERT_X509,
BUILD_FROM_FILE, path,
BUILD_X509_FLAG, 0,
BUILD_END);
if (cert)
{
cert = add_cert(this, cert);
return cert->get_ref(cert);
}
return NULL;
}
/**
* load trusted certificates from a directory
*/
static void load_certdir(private_stroke_cred_t *this, char *path,
certificate_type_t type, x509_flag_t flag)
{
struct stat st;
char *file;
enumerator_t *enumerator = enumerator_create_directory(path);
if (!enumerator)
{
DBG1(DBG_CFG, " reading directory failed");
return;
}
while (enumerator->enumerate(enumerator, NULL, &file, &st))
{
certificate_t *cert;
if (!S_ISREG(st.st_mode))
{
/* skip special file */
continue;
}
switch (type)
{
case CERT_X509:
cert = lib->creds->create(lib->creds,
CRED_CERTIFICATE, CERT_X509,
BUILD_FROM_FILE, file,
BUILD_X509_FLAG, flag,
BUILD_END);
if (cert)
{
add_cert(this, cert);
}
break;
case CERT_X509_CRL:
cert = lib->creds->create(lib->creds,
CRED_CERTIFICATE, CERT_X509_CRL,
BUILD_FROM_FILE, file,
BUILD_END);
if (cert)
{
add_crl(this, (crl_t*)cert);
}
break;
case CERT_X509_AC:
cert = lib->creds->create(lib->creds,
CRED_CERTIFICATE, CERT_X509_AC,
BUILD_FROM_FILE, file,
BUILD_END);
if (cert)
{
cert->destroy(cert);
}
break;
default:
break;
}
}
enumerator->destroy(enumerator);
}
/**
* Implementation of credential_set_t.cache_cert.
*/
static void cache_cert(private_stroke_cred_t *this, certificate_t *cert)
{
if (cert->get_type(cert) == CERT_X509_CRL && this->cachecrl)
{
/* CRLs get cached to /etc/ipsec.d/crls/authkeyId.der */
crl_t *crl = (crl_t*)cert;
cert->get_ref(cert);
if (add_crl(this, crl))
{
char buf[256];
char *hex;
chunk_t chunk;
identification_t *id;
id = crl->get_authKeyIdentifier(crl);
chunk = id->get_encoding(id);
hex = chunk_to_hex(chunk, FALSE);
snprintf(buf, sizeof(buf), "%s/%s.der", CRL_DIR, hex);
free(hex);
chunk = cert->get_encoding(cert);
if (chunk_write(chunk, buf, 022, TRUE))
{
DBG1(DBG_CFG, "cached crl to %s", buf);
}
else
{
DBG1(DBG_CFG, "caching crl to %s failed", buf);
}
free(chunk.ptr);
}
}
}
/**
* Implementation of stroke_cred_t.cachecrl.
*/
static void cachecrl(private_stroke_cred_t *this, bool enabled)
{
DBG1(DBG_CFG, "crl caching to %s %s",
CRL_DIR, enabled ? "enabled" : "disabled");
this->cachecrl = enabled;
}
/**
* Convert a string of characters into a binary secret
* A string between single or double quotes is treated as ASCII characters
* A string prepended by 0x is treated as HEX and prepended by 0s as Base64
*/
static err_t extract_secret(chunk_t *secret, chunk_t *line)
{
chunk_t raw_secret;
char delimiter = ' ';
bool quotes = FALSE;
if (!eat_whitespace(line))
{
return "missing secret";
}
if (*line->ptr == '\'' || *line->ptr == '"')
{
quotes = TRUE;
delimiter = *line->ptr;
line->ptr++; line->len--;
}
if (!extract_token(&raw_secret, delimiter, line))
{
if (delimiter == ' ')
{
raw_secret = *line;
}
else
{
return "missing second delimiter";
}
}
if (quotes)
{
/* treat as an ASCII string */
*secret = chunk_clone(raw_secret);
}
else
{
size_t len;
err_t ugh;
/* secret converted to binary form doesn't use more space than the raw_secret */
*secret = chunk_alloc(raw_secret.len);
/* convert from HEX or Base64 to binary */
ugh = ttodata(raw_secret.ptr, raw_secret.len, 0, secret->ptr, secret->len, &len);
if (ugh != NULL)
{
chunk_clear(secret);
return ugh;
}
secret->len = len;
}
return NULL;
}
/**
* reload ipsec.secrets
*/
static void load_secrets(private_stroke_cred_t *this)
{
size_t bytes;
int line_nr = 0;
chunk_t chunk, src, line;
FILE *fd;
private_key_t *private;
shared_key_t *shared;
DBG1(DBG_CFG, "loading secrets from '%s'", SECRETS_FILE);
fd = fopen(SECRETS_FILE, "r");
if (fd == NULL)
{
DBG1(DBG_CFG, "opening secrets file '%s' failed");
return;
}
/* TODO: do error checks */
fseek(fd, 0, SEEK_END);
chunk.len = ftell(fd);
rewind(fd);
chunk.ptr = malloc(chunk.len);
bytes = fread(chunk.ptr, 1, chunk.len, fd);
fclose(fd);
src = chunk;
this->mutex->lock(this->mutex);
while (this->shared->remove_last(this->shared,
(void**)&shared) == SUCCESS)
{
shared->destroy(shared);
}
while (this->private->remove_last(this->private,
(void**)&private) == SUCCESS)
{
private->destroy(private);
}
while (fetchline(&src, &line))
{
chunk_t ids, token;
shared_key_type_t type;
line_nr++;
if (!eat_whitespace(&line))
{
continue;
}
if (!extract_last_token(&ids, ':', &line))
{
DBG1(DBG_CFG, "line %d: missing ':' separator", line_nr);
goto error;
}
/* NULL terminate the ids string by replacing the : separator */
*(ids.ptr + ids.len) = '\0';
if (!eat_whitespace(&line) || !extract_token(&token, ' ', &line))
{
DBG1(DBG_CFG, "line %d: missing token", line_nr);
goto error;
}
if (match("RSA", &token))
{
char path[PATH_MAX];
chunk_t filename;
chunk_t secret = chunk_empty;
private_key_t *key;
bool pgp = FALSE;
chunk_t chunk = chunk_empty;
err_t ugh = extract_value(&filename, &line);
if (ugh != NULL)
{
DBG1(DBG_CFG, "line %d: %s", line_nr, ugh);
goto error;
}
if (filename.len == 0)
{
DBG1(DBG_CFG, "line %d: empty filename", line_nr);
goto error;
}
if (*filename.ptr == '/')
{
/* absolute path name */
snprintf(path, sizeof(path), "%.*s", filename.len, filename.ptr);
}
else
{
/* relative path name */
snprintf(path, sizeof(path), "%s/%.*s", PRIVATE_KEY_DIR,
filename.len, filename.ptr);
}
/* check for optional passphrase */
if (eat_whitespace(&line))
{
ugh = extract_secret(&secret, &line);
if (ugh != NULL)
{
DBG1(DBG_CFG, "line %d: malformed passphrase: %s", line_nr, ugh);
goto error;
}
}
if (pem_asn1_load_file(path, &secret, &chunk, &pgp))
{
key = lib->creds->create(lib->creds, CRED_PRIVATE_KEY, KEY_RSA,
BUILD_BLOB_ASN1_DER, chunk, BUILD_END);
if (key)
{
DBG1(DBG_CFG, " loaded private key file '%s'", path);
this->private->insert_last(this->private, key);
}
}
chunk_clear(&secret);
}
else if ((match("PSK", &token) && (type = SHARED_IKE)) ||
(match("EAP", &token) && (type = SHARED_EAP)) ||
(match("XAUTH", &token) && (type = SHARED_EAP)) ||
(match("PIN", &token) && (type = SHARED_PIN)))
{
stroke_shared_key_t *shared_key;
chunk_t secret = chunk_empty;
bool any = TRUE;
err_t ugh = extract_secret(&secret, &line);
if (ugh != NULL)
{
DBG1(DBG_CFG, "line %d: malformed secret: %s", line_nr, ugh);
goto error;
}
shared_key = stroke_shared_key_create(type, secret);
DBG1(DBG_CFG, " loaded %N secret for %s", shared_key_type_names, type,
ids.len > 0 ? (char*)ids.ptr : "%any");
DBG4(DBG_CFG, " secret: %#B", &secret);
this->shared->insert_last(this->shared, shared_key);
while (ids.len > 0)
{
chunk_t id;
identification_t *peer_id;
ugh = extract_value(&id, &ids);
if (ugh != NULL)
{
DBG1(DBG_CFG, "line %d: %s", line_nr, ugh);
goto error;
}
if (id.len == 0)
{
continue;
}
/* NULL terminate the ID string */
*(id.ptr + id.len) = '\0';
peer_id = identification_create_from_string(id.ptr);
if (peer_id == NULL)
{
DBG1(DBG_CFG, "line %d: malformed ID: %s", line_nr, id.ptr);
goto error;
}
if (peer_id->get_type(peer_id) == ID_ANY)
{
peer_id->destroy(peer_id);
continue;
}
shared_key->add_owner(shared_key, peer_id);
any = FALSE;
}
if (any)
{
shared_key->add_owner(shared_key,
identification_create_from_encoding(ID_ANY, chunk_empty));
}
}
else
{
DBG1(DBG_CFG, "line %d: token must be either "
"RSA, PSK, EAP, or PIN", line_nr);
goto error;
}
}
error:
this->mutex->unlock(this->mutex);
chunk_clear(&chunk);
}
/**
* load all certificates from ipsec.d
*/
static void load_certs(private_stroke_cred_t *this)
{
DBG1(DBG_CFG, "loading ca certificates from '%s'",
CA_CERTIFICATE_DIR);
load_certdir(this, CA_CERTIFICATE_DIR, CERT_X509, X509_CA);
DBG1(DBG_CFG, "loading aa certificates from '%s'",
AA_CERTIFICATE_DIR);
load_certdir(this, AA_CERTIFICATE_DIR, CERT_X509, X509_AA);
DBG1(DBG_CFG, "loading ocsp signer certificates from '%s'",
OCSP_CERTIFICATE_DIR);
load_certdir(this, OCSP_CERTIFICATE_DIR, CERT_X509, X509_OCSP_SIGNER);
DBG1(DBG_CFG, "loading attribute certificates from '%s'",
ATTR_CERTIFICATE_DIR);
load_certdir(this, ATTR_CERTIFICATE_DIR, CERT_X509_AC, 0);
DBG1(DBG_CFG, "loading crls from '%s'",
CRL_DIR);
load_certdir(this, CRL_DIR, CERT_X509_CRL, 0);
}
/**
* Implementation of stroke_cred_t.reread.
*/
static void reread(private_stroke_cred_t *this, stroke_msg_t *msg)
{
if (msg->reread.flags & REREAD_SECRETS)
{
DBG1(DBG_CFG, "rereading secrets");
load_secrets(this);
}
if (msg->reread.flags & REREAD_CACERTS)
{
DBG1(DBG_CFG, "rereading ca certificates from '%s'",
CA_CERTIFICATE_DIR);
load_certdir(this, CA_CERTIFICATE_DIR, CERT_X509, X509_CA);
}
if (msg->reread.flags & REREAD_OCSPCERTS)
{
DBG1(DBG_CFG, "rereading ocsp signer certificates from '%s'",
OCSP_CERTIFICATE_DIR);
load_certdir(this, OCSP_CERTIFICATE_DIR, CERT_X509,
X509_OCSP_SIGNER);
}
if (msg->reread.flags & REREAD_AACERTS)
{
DBG1(DBG_CFG, "rereading aa certificates from '%s'",
AA_CERTIFICATE_DIR);
load_certdir(this, AA_CERTIFICATE_DIR, CERT_X509, X509_AA);
}
if (msg->reread.flags & REREAD_ACERTS)
{
DBG1(DBG_CFG, "rereading attribute certificates from '%s'",
ATTR_CERTIFICATE_DIR);
load_certdir(this, ATTR_CERTIFICATE_DIR, CERT_X509_AC, 0);
}
if (msg->reread.flags & REREAD_CRLS)
{
DBG1(DBG_CFG, "rereading crls from '%s'",
CRL_DIR);
load_certdir(this, CRL_DIR, CERT_X509_CRL, 0);
}
}
/**
* Implementation of stroke_cred_t.destroy
*/
static void destroy(private_stroke_cred_t *this)
{
this->certs->destroy_offset(this->certs, offsetof(certificate_t, destroy));
this->shared->destroy_offset(this->shared, offsetof(shared_key_t, destroy));
this->private->destroy_offset(this->private, offsetof(private_key_t, destroy));
this->mutex->destroy(this->mutex);
free(this);
}
/*
* see header file
*/
stroke_cred_t *stroke_cred_create()
{
private_stroke_cred_t *this = malloc_thing(private_stroke_cred_t);
this->public.set.create_private_enumerator = (void*)create_private_enumerator;
this->public.set.create_cert_enumerator = (void*)create_cert_enumerator;
this->public.set.create_shared_enumerator = (void*)create_shared_enumerator;
this->public.set.create_cdp_enumerator = (void*)return_null;
this->public.set.cache_cert = (void*)cache_cert;
this->public.reread = (void(*)(stroke_cred_t*, stroke_msg_t *msg))reread;
this->public.load_ca = (certificate_t*(*)(stroke_cred_t*, char *filename))load_ca;
this->public.load_peer = (certificate_t*(*)(stroke_cred_t*, char *filename))load_peer;
this->public.cachecrl = (void(*)(stroke_cred_t*, bool enabled))cachecrl;
this->public.destroy = (void(*)(stroke_cred_t*))destroy;
this->certs = linked_list_create();
this->shared = linked_list_create();
this->private = linked_list_create();
this->mutex = mutex_create(MUTEX_RECURSIVE);
load_certs(this);
load_secrets(this);
this->cachecrl = FALSE;
return &this->public;
}
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