/
p11_child_openssl.c
2135 lines (1846 loc) · 67.7 KB
/
p11_child_openssl.c
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/*
SSSD
Helper child to commmunicate with SmartCard via OpenSSL
Authors:
Sumit Bose <sbose@redhat.com>
Copyright (C) 2018 Red Hat
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 3 of the License, or
(at your option) any later version.
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.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <openssl/ssl.h>
#include <openssl/crypto.h>
#include <openssl/x509.h>
#include <openssl/err.h>
#include <openssl/rand.h>
#include <openssl/ocsp.h>
#include <p11-kit/p11-kit.h>
#include <p11-kit/uri.h>
#include <popt.h>
#include "util/util.h"
#include "util/crypto/sss_crypto.h"
#include "util/child_common.h"
#include "p11_child/p11_child.h"
struct p11_ctx {
X509_STORE *x509_store;
const char *ca_db;
bool wait_for_card;
struct cert_verify_opts *cert_verify_opts;
};
static OCSP_RESPONSE *query_responder(BIO *cbio, const char *host,
const char *path,
OCSP_REQUEST *req, int req_timeout)
{
int fd;
int rv;
OCSP_REQ_CTX *ctx = NULL;
OCSP_RESPONSE *rsp = NULL;
fd_set confds;
struct timeval tv;
if (req_timeout != -1) {
BIO_set_nbio(cbio, 1);
}
rv = BIO_do_connect(cbio);
if ((rv <= 0) && ((req_timeout == -1) || !BIO_should_retry(cbio))) {
DEBUG(SSSDBG_OP_FAILURE, "Error connecting BIO\n");
return NULL;
}
if (BIO_get_fd(cbio, &fd) < 0) {
DEBUG(SSSDBG_OP_FAILURE, "Can't get connection fd\n");
goto err;
}
if (req_timeout != -1 && rv <= 0) {
FD_ZERO(&confds);
FD_SET(fd, &confds);
tv.tv_usec = 0;
tv.tv_sec = req_timeout;
rv = select(fd + 1, NULL, (void *)&confds, NULL, &tv);
if (rv == 0) {
DEBUG(SSSDBG_OP_FAILURE, "Timeout on connect\n");
return NULL;
}
}
ctx = OCSP_sendreq_new(cbio, path, NULL, -1);
if (ctx == NULL) {
return NULL;
}
if (OCSP_REQ_CTX_add1_header(ctx, "Host", host) == 0) {
goto err;
}
if (!OCSP_REQ_CTX_set1_req(ctx, req)) {
goto err;
}
for (;;) {
rv = OCSP_sendreq_nbio(&rsp, ctx);
if (rv != -1)
break;
if (req_timeout == -1)
continue;
FD_ZERO(&confds);
FD_SET(fd, &confds);
tv.tv_usec = 0;
tv.tv_sec = req_timeout;
if (BIO_should_read(cbio)) {
rv = select(fd + 1, (void *)&confds, NULL, NULL, &tv);
} else if (BIO_should_write(cbio)) {
rv = select(fd + 1, NULL, (void *)&confds, NULL, &tv);
} else {
DEBUG(SSSDBG_OP_FAILURE, "Unexpected retry condition\n");
goto err;
}
if (rv == 0) {
DEBUG(SSSDBG_OP_FAILURE, "Timeout on request\n");
break;
}
if (rv == -1) {
DEBUG(SSSDBG_OP_FAILURE, "Select error\n");
break;
}
}
err:
OCSP_REQ_CTX_free(ctx);
return rsp;
}
#if OPENSSL_VERSION_NUMBER < 0x10100000L
#define TLS_client_method SSLv23_client_method
#define X509_STORE_get0_objects(store) (store->objs)
#define X509_OBJECT_get_type(object) (object->type)
#define X509_OBJECT_get0_X509(object) (object->data.x509)
#define EVP_MD_CTX_free EVP_MD_CTX_destroy
#define X509_CRL_get0_nextUpdate(object) (object->crl->nextUpdate)
#endif
OCSP_RESPONSE *process_responder(OCSP_REQUEST *req,
const char *host, const char *path,
char *port, int use_ssl,
int req_timeout)
{
BIO *cbio = NULL;
SSL_CTX *ctx = NULL;
OCSP_RESPONSE *resp = NULL;
cbio = BIO_new_connect(host);
if (cbio == NULL) {
DEBUG(SSSDBG_OP_FAILURE, "Error creating connect BIO\n");
goto end;
}
if (port != NULL)
BIO_set_conn_port(cbio, port);
if (use_ssl == 1) {
BIO *sbio;
ctx = SSL_CTX_new(TLS_client_method());
if (ctx == NULL) {
DEBUG(SSSDBG_OP_FAILURE, "Error creating SSL context.\n");
goto end;
}
SSL_CTX_set_mode(ctx, SSL_MODE_AUTO_RETRY);
sbio = BIO_new_ssl(ctx, 1);
cbio = BIO_push(sbio, cbio);
}
resp = query_responder(cbio, host, path, req, req_timeout);
if (resp == NULL) {
DEBUG(SSSDBG_OP_FAILURE, "Error querying OCSP responder\n");
}
end:
BIO_free_all(cbio);
SSL_CTX_free(ctx);
return resp;
}
static const EVP_MD *get_dgst(CK_MECHANISM_TYPE ocsp_dgst)
{
const EVP_MD *dgst = NULL;
switch (ocsp_dgst) {
case CKM_SHA_1:
dgst = EVP_sha1();
break;
case CKM_SHA256:
dgst = EVP_sha256();
break;
case CKM_SHA384:
dgst = EVP_sha384();
break;
case CKM_SHA512:
dgst = EVP_sha512();
break;
default:
DEBUG(SSSDBG_CRIT_FAILURE, "Unsupported digest type [%lu].\n",
ocsp_dgst);
dgst = NULL;
}
return dgst;
}
static char *get_issuer_subject_str(TALLOC_CTX *mem_ctx, X509 *cert)
{
X509_NAME *issuer_name;
X509_NAME *subject_name;
char *tmp_str = NULL;
BIO *bio_mem = NULL;
int ret;
char *str = NULL;
long mem_len;
issuer_name = X509_get_issuer_name(cert);
subject_name = X509_get_subject_name(cert);
if (issuer_name == NULL || subject_name == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, "Missing issuer or subject.\n");
return NULL;
}
bio_mem = BIO_new(BIO_s_mem());
if (bio_mem == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, "BIO_new failed.\n");
return NULL;
}
ret = BIO_printf(bio_mem, "Issuer: [");
if (ret == -1) {
DEBUG(SSSDBG_OP_FAILURE, "BIO_printf failed.\n");
goto done;
}
ret = X509_NAME_print_ex(bio_mem, issuer_name, 0, XN_FLAG_ONELINE);
if (ret == -1) {
DEBUG(SSSDBG_OP_FAILURE, "X509_NAME_print_ex failed.\n");
goto done;
}
ret = BIO_printf(bio_mem, "] Subject: [");
if (ret == -1) {
DEBUG(SSSDBG_OP_FAILURE, "BIO_printf failed.\n");
goto done;
}
ret = X509_NAME_print_ex(bio_mem, subject_name, 0, XN_FLAG_ONELINE);
if (ret == -1) {
DEBUG(SSSDBG_OP_FAILURE, "X509_NAME_print_ex failed.\n");
goto done;
}
ret = BIO_printf(bio_mem, "]");
if (ret == -1) {
DEBUG(SSSDBG_OP_FAILURE, "BIO_printf failed.\n");
goto done;
}
mem_len = BIO_get_mem_data(bio_mem, &tmp_str);
if (mem_len <= 0) {
DEBUG(SSSDBG_OP_FAILURE, "BIO_get_mem_data failed.\n");
goto done;
}
str = talloc_asprintf(mem_ctx, "%.*s",
mem_len < INT_MAX ? (int) mem_len : INT_MAX, tmp_str);
if (str == NULL) {
DEBUG(SSSDBG_OP_FAILURE, "talloc_asprintf failed.\n");
}
done:
BIO_free_all(bio_mem);
return str;
}
static errno_t do_ocsp(struct p11_ctx *p11_ctx, X509 *cert)
{
OCSP_REQUEST *ocsp_req = NULL;
OCSP_RESPONSE *ocsp_resp = NULL;
OCSP_BASICRESP *ocsp_basic = NULL;
OCSP_CERTID *cid = NULL;
STACK_OF(OPENSSL_STRING) *ocsp_urls = NULL;
char *url_str;
X509 *issuer = NULL;
int req_timeout = -1;
int status;
int ret = EIO;
int reason;
ASN1_GENERALIZEDTIME *revtime;
ASN1_GENERALIZEDTIME *thisupd;
ASN1_GENERALIZEDTIME *nextupd;
long grace_time = (5 * 60); /* Allow 5 minutes time difference when
* checking the validity of the OCSP response */
char *host = NULL;
char *path = NULL;
char *port = NULL;
int use_ssl;
X509_NAME *issuer_name = NULL;
X509_OBJECT *x509_obj;
STACK_OF(X509_OBJECT) *store_objects;
const EVP_MD *ocsp_dgst = NULL;
char *tmp_str;
ocsp_urls = X509_get1_ocsp(cert);
if (ocsp_urls == NULL
&& p11_ctx->cert_verify_opts->ocsp_default_responder == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE,
"No OCSP URL in certificate and no default responder defined, "
"skipping OCSP check.\n");
return EOK;
}
if (p11_ctx->cert_verify_opts->ocsp_default_responder != NULL) {
url_str = p11_ctx->cert_verify_opts->ocsp_default_responder;
} else {
if (sk_OPENSSL_STRING_num(ocsp_urls) > 1) {
DEBUG(SSSDBG_CONF_SETTINGS,
"Found more than 1 OCSP URLs, just using the first.\n");
}
url_str = sk_OPENSSL_STRING_value(ocsp_urls, 0);
}
DEBUG(SSSDBG_TRACE_ALL, "Using OCSP URL [%s].\n", url_str);
ret = OCSP_parse_url(url_str, &host, &port, &path, &use_ssl);
if (ret != 1) {
DEBUG(SSSDBG_OP_FAILURE, "OCSP_parse_url failed to parse [%s].\n",
url_str);
ret = EIO;
goto done;
}
issuer_name = X509_get_issuer_name(cert);
if (issuer_name == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, "Certificate has no issuer, "
"cannot run OCSP check.\n");
ret = EINVAL;
goto done;
}
store_objects = X509_STORE_get0_objects(p11_ctx->x509_store);
if (store_objects == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE,
"No objects found in certificate store, OCSP failed.\n");
ret = EINVAL;
goto done;
}
x509_obj = X509_OBJECT_retrieve_by_subject(store_objects, X509_LU_X509,
issuer_name);
if (x509_obj == NULL || X509_OBJECT_get_type(x509_obj) != X509_LU_X509) {
DEBUG(SSSDBG_CRIT_FAILURE, "Issuer not found.\n");
ret = EIO;
goto done;
}
issuer = X509_OBJECT_get0_X509(x509_obj);
ocsp_req = OCSP_REQUEST_new();
if (ocsp_req == NULL) {
DEBUG(SSSDBG_OP_FAILURE, "OCSP_REQUEST_new failed.\n");
ret = ENOMEM;
goto done;
}
ocsp_dgst = get_dgst(p11_ctx->cert_verify_opts->ocsp_dgst);
if (ocsp_dgst == NULL) {
DEBUG(SSSDBG_OP_FAILURE, "Cannot determine configured digest function "
"for OCSP, using default sha1.\n");
ocsp_dgst = EVP_sha1();
}
cid = OCSP_cert_to_id(ocsp_dgst, cert, issuer);
if (cid == NULL) {
DEBUG(SSSDBG_OP_FAILURE, "OCSP_cert_to_id failed.\n");
ret = EIO;
goto done;
}
if (OCSP_request_add0_id(ocsp_req, cid) == NULL) {
DEBUG(SSSDBG_OP_FAILURE, "OCSP_request_add0_id failed.\n");
ret = EIO;
goto done;
}
OCSP_request_add1_nonce(ocsp_req, NULL, -1);
ocsp_resp = process_responder(ocsp_req, host, path, port, use_ssl,
req_timeout);
if (ocsp_resp == NULL) {
if (p11_ctx->cert_verify_opts->soft_ocsp) {
tmp_str = get_issuer_subject_str(p11_ctx, cert);
DEBUG(SSSDBG_CRIT_FAILURE,
"Failed to get an OCSP response from [%s] for %s, but "
"'soft_ocsp' is set and OCSP check will be skipped.\n",
url_str, tmp_str == NULL ? " - not available -" : tmp_str);
sss_log(SSS_LOG_CRIT,
"Skipping OCSP check because 'soft_ocsp' is set and no "
"OCSP response is available from [%s] for %s.\n", url_str,
tmp_str == NULL ? " - not available -" : tmp_str);
talloc_free(tmp_str);
ret = EOK;
} else {
DEBUG(SSSDBG_OP_FAILURE, "process_responder failed.\n");
ret = EIO;
}
goto done;
}
status = OCSP_response_status(ocsp_resp);
if (status != OCSP_RESPONSE_STATUS_SUCCESSFUL) {
DEBUG(SSSDBG_CRIT_FAILURE, "OCSP response error: [%d][%s].\n",
status, OCSP_response_status_str(status));
ret = EIO;
goto done;
}
ocsp_basic = OCSP_response_get1_basic(ocsp_resp);
if (ocsp_resp == NULL) {
DEBUG(SSSDBG_OP_FAILURE, "OCSP_response_get1_basic failed.\n");
ret = EIO;
goto done;
}
switch (OCSP_check_nonce(ocsp_req, ocsp_basic)) {
case -1:
DEBUG(SSSDBG_CRIT_FAILURE, "No nonce in OCSP response. This might "
"indicate a replay attack or an OCSP responder which does not "
"support nonces. Accepting response.\n");
break;
case 0:
DEBUG(SSSDBG_CRIT_FAILURE, "Nonce in OCSP response does not match the "
"one used in the request.\n");
ret = EIO;
goto done;
break;
case 1:
DEBUG(SSSDBG_TRACE_ALL, "Nonce in OCSP response is the same as the one "
"used in the request.\n");
break;
case 2:
case 3:
DEBUG(SSSDBG_CRIT_FAILURE, "Missing nonce in OCSP request, this should"
"never happen.\n");
ret = EIO;
goto done;
break;
default:
DEBUG(SSSDBG_CRIT_FAILURE, "Unexpected result of OCSP_check_nonce.\n");
}
status = OCSP_basic_verify(ocsp_basic, NULL, p11_ctx->x509_store, 0);
if (status != 1) {
DEBUG(SSSDBG_CRIT_FAILURE, "OCSP_basic_verify() failed to verify OCSP "
"response.\n");
ret = EIO;
goto done;
}
ret = OCSP_resp_find_status(ocsp_basic, cid, &status, &reason,
&revtime, &thisupd, &nextupd);
if (ret != 1) {
DEBUG(SSSDBG_CRIT_FAILURE, "OCSP response does not contain status of "
"our certificate.\n");
ret = EIO;
goto done;
}
if (status != V_OCSP_CERTSTATUS_GOOD) {
DEBUG(SSSDBG_CRIT_FAILURE, "OCSP check failed with [%d][%s].\n",
status, OCSP_cert_status_str(status));
if (status == V_OCSP_CERTSTATUS_REVOKED) {
DEBUG(SSSDBG_CRIT_FAILURE, "Certificate is revoked [%d][%s].\n",
reason, OCSP_crl_reason_str(reason));
}
ret = EIO;
goto done;
}
if (OCSP_check_validity(thisupd, nextupd, grace_time, -1) != 1) {
DEBUG(SSSDBG_CRIT_FAILURE, "OCSP response is not valid anymore.\n");
ret = EIO;
goto done;
}
DEBUG(SSSDBG_TRACE_ALL, "OCSP check was successful.\n");
ret = EOK;
done:
OCSP_BASICRESP_free(ocsp_basic);
OCSP_RESPONSE_free(ocsp_resp);
OCSP_REQUEST_free(ocsp_req);
OPENSSL_free(host);
OPENSSL_free(port);
OPENSSL_free(path);
X509_email_free(ocsp_urls);
return ret;
}
static char *get_pkcs11_uri(TALLOC_CTX *mem_ctx, CK_INFO *module_info,
CK_SLOT_INFO *slot_info, CK_SLOT_ID slot_id,
CK_TOKEN_INFO *token_info, CK_ATTRIBUTE *label,
CK_ATTRIBUTE *id)
{
P11KitUri *uri;
char *uri_str = NULL;
char *tmp_str = NULL;
int ret;
CK_OBJECT_CLASS cert_class = CKO_CERTIFICATE;
CK_ATTRIBUTE class_attr = {CKA_CLASS, &cert_class, sizeof(CK_OBJECT_CLASS)};
uri = p11_kit_uri_new();
if (uri == NULL) {
DEBUG(SSSDBG_OP_FAILURE, "p11_kit_uri_new failed.\n");
return NULL;
}
ret = p11_kit_uri_set_attribute(uri, label);
if (ret != P11_KIT_URI_OK) {
DEBUG(SSSDBG_OP_FAILURE, "p11_kit_uri_set_attribute failed.\n");
goto done;
}
ret = p11_kit_uri_set_attribute(uri, id);
if (ret != P11_KIT_URI_OK) {
DEBUG(SSSDBG_OP_FAILURE, "p11_kit_uri_set_attribute failed.\n");
goto done;
}
ret = p11_kit_uri_set_attribute(uri, &class_attr);
if (ret != P11_KIT_URI_OK) {
DEBUG(SSSDBG_OP_FAILURE, "p11_kit_uri_set_attribute failed.\n");
goto done;
}
memcpy(p11_kit_uri_get_token_info(uri), token_info, sizeof(CK_TOKEN_INFO));
memcpy(p11_kit_uri_get_slot_info(uri), slot_info, sizeof(CK_SLOT_INFO));
p11_kit_uri_set_slot_id(uri, slot_id);
memcpy(p11_kit_uri_get_module_info(uri), module_info, sizeof(CK_INFO));
ret = p11_kit_uri_format(uri, P11_KIT_URI_FOR_ANY, &tmp_str);
if (ret != P11_KIT_URI_OK) {
DEBUG(SSSDBG_OP_FAILURE, "p11_kit_uri_format failed [%s].\n",
p11_kit_uri_message(ret));
goto done;
}
if (tmp_str != NULL) {
uri_str = talloc_strdup(mem_ctx, tmp_str);
free(tmp_str);
if (uri_str == NULL) {
DEBUG(SSSDBG_OP_FAILURE, "talloc_strdup failed.\n");
}
}
done:
p11_kit_uri_free(uri);
return uri_str;
}
static int p11_ctx_destructor(struct p11_ctx *p11_ctx)
{
X509_STORE_free(p11_ctx->x509_store);
CRYPTO_cleanup_all_ex_data();
return 0;
}
errno_t init_p11_ctx(TALLOC_CTX *mem_ctx, const char *ca_db,
bool wait_for_card, struct p11_ctx **p11_ctx)
{
int ret;
struct p11_ctx *ctx;
ctx = talloc_zero(mem_ctx, struct p11_ctx);
if (ctx == NULL) {
DEBUG(SSSDBG_OP_FAILURE, "talloc_zero failed.\n");
return ENOMEM;
}
/* See https://wiki.openssl.org/index.php/Library_Initialization for
* details. */
#if OPENSSL_VERSION_NUMBER >= 0x10100000L
ret = OPENSSL_init_ssl(0, NULL);
#else
ret = SSL_library_init();
#endif
if (ret != 1) {
DEBUG(SSSDBG_FATAL_FAILURE, "Failed to initialize OpenSSL.\n");
ret = EIO;
goto done;
}
ctx->ca_db = ca_db;
ctx->wait_for_card = wait_for_card;
talloc_set_destructor(ctx, p11_ctx_destructor);
*p11_ctx = ctx;
ret = EOK;
done:
if (ret != EOK) {
talloc_free(ctx);
}
return ret;
}
static int ensure_verify_param(X509_VERIFY_PARAM **verify_param_out)
{
if (verify_param_out == NULL) {
return EINVAL;
}
if (*verify_param_out != NULL) {
return EOK;
}
*verify_param_out = X509_VERIFY_PARAM_new();
if (*verify_param_out == NULL) {
DEBUG(SSSDBG_OP_FAILURE, "X509_VERIFY_PARAM_new failed.\n");
return ENOMEM;
}
return EOK;
}
errno_t init_verification(struct p11_ctx *p11_ctx,
struct cert_verify_opts *cert_verify_opts)
{
int ret;
X509_STORE *store = NULL;
unsigned long err;
int file_index = 0;
X509_LOOKUP *lookup = NULL;
X509_VERIFY_PARAM *verify_param = NULL;
store = X509_STORE_new();
if (store == NULL) {
err = ERR_get_error();
DEBUG(SSSDBG_OP_FAILURE, "X509_STORE_new failed [%lu][%s].\n",
err, ERR_error_string(err, NULL));
return ENOMEM;
}
lookup = X509_STORE_add_lookup(store, X509_LOOKUP_file());
if (lookup == NULL) {
err = ERR_get_error();
DEBUG(SSSDBG_OP_FAILURE, "X509_LOOKUP_file failed [%lu][%s].\n",
err, ERR_error_string(err, NULL));
ret = EIO;
goto done;
}
if (!X509_LOOKUP_load_file(lookup, p11_ctx->ca_db, X509_FILETYPE_PEM)) {
err = ERR_get_error();
DEBUG(SSSDBG_OP_FAILURE,
"X509_LOOKUP_load_file [%s] failed [%lu][%s].\n",
p11_ctx->ca_db, err, ERR_error_string(err, NULL));
if (ERR_GET_LIB(err) == ERR_LIB_SYS &&
ERR_GET_REASON(err) == ENOENT) {
ret = ERR_CA_DB_NOT_FOUND;
} else {
ret = EIO;
}
goto done;
}
if (cert_verify_opts->verification_partial_chain) {
if ((ret = ensure_verify_param (&verify_param)) != EOK) {
goto done;
}
X509_VERIFY_PARAM_set_flags(verify_param, X509_V_FLAG_PARTIAL_CHAIN);
}
if (cert_verify_opts->crl_files != NULL) {
if ((ret = ensure_verify_param (&verify_param)) != EOK) {
goto done;
}
X509_VERIFY_PARAM_set_flags(verify_param, (X509_V_FLAG_CRL_CHECK
| X509_V_FLAG_CRL_CHECK_ALL));
while (file_index < cert_verify_opts->num_files) {
ret = X509_load_crl_file(lookup,
cert_verify_opts->crl_files[file_index],
X509_FILETYPE_PEM);
if (ret == 0) {
err = ERR_get_error();
DEBUG(SSSDBG_OP_FAILURE,
"X509_load_crl_file for [%s] failed [%lu][%s].\n",
cert_verify_opts->crl_files[file_index],
err, ERR_error_string(err, NULL));
ret = EIO;
goto done;
}
file_index++;
}
}
if (verify_param != NULL) {
X509_STORE_set1_param(store, verify_param);
}
p11_ctx->x509_store = store;
p11_ctx->cert_verify_opts = cert_verify_opts;
ret = EOK;
done:
if (ret != EOK) {
X509_STORE_free(store);
}
if (verify_param != NULL) {
X509_VERIFY_PARAM_free(verify_param);
}
return ret;
}
static int b64_to_cert(const char *b64, X509 **cert)
{
X509 *x509;
unsigned char *der = NULL;
const unsigned char *d;
size_t der_size;
der = sss_base64_decode(NULL, b64, &der_size);
if (der == NULL) {
DEBUG(SSSDBG_OP_FAILURE, "sss_base64_decode failed.\n");
return ENOMEM;
}
d = (const unsigned char *) der;
x509 = d2i_X509(NULL, &d, (int) der_size);
talloc_free(der);
if (x509 == NULL) {
DEBUG(SSSDBG_OP_FAILURE, "d2i_X509 failed.\n");
return EINVAL;
}
*cert = x509;
return 0;
}
bool do_verification(struct p11_ctx *p11_ctx, X509 *cert)
{
bool res = false;
int ret;
X509_STORE_CTX *ctx = NULL;
unsigned long err;
char *tmp_str = NULL;
X509_VERIFY_PARAM *verify_param = NULL;
ctx = X509_STORE_CTX_new();
if (ctx == NULL) {
err = ERR_get_error();
DEBUG(SSSDBG_OP_FAILURE, "X509_STORE_CTX_new failed [%lu][%s].\n",
err, ERR_error_string(err, NULL));
return false;
}
if (!X509_STORE_CTX_init(ctx, p11_ctx->x509_store, cert, NULL)) {
err = ERR_get_error();
DEBUG(SSSDBG_OP_FAILURE, "X509_STORE_CTX_init failed [%lu][%s].\n",
err, ERR_error_string(err, NULL));
goto done;
}
ret = X509_verify_cert(ctx);
if (ret != 1) {
DEBUG(SSSDBG_OP_FAILURE, "X509_verify_cert failed [%d].\n", ret);
ret = X509_STORE_CTX_get_error(ctx);
if (ret == X509_V_ERR_CRL_HAS_EXPIRED
&& p11_ctx->cert_verify_opts->soft_crl) {
tmp_str = get_issuer_subject_str(p11_ctx, cert);
DEBUG(SSSDBG_OP_FAILURE, "CRL is expired but 'soft_crl' is set, "
"ignoring CRL check for certificate %s.\n",
tmp_str == NULL ? " - not available - "
: tmp_str);
/* We have to check again without the CRL check if the certificate
* is valid or not. The X509_STORE_CTX must be freshly initialized
* for another call to X509_verify_cert(), see e.g.
* man X509_STORE_CTX_init for details. */
X509_STORE_CTX_cleanup(ctx);
if (!X509_STORE_CTX_init(ctx, p11_ctx->x509_store, cert, NULL)) {
err = ERR_get_error();
DEBUG(SSSDBG_OP_FAILURE,
"X509_STORE_CTX_init failed [%lu][%s].\n", err,
ERR_error_string(err, NULL));
goto done;
}
verify_param = X509_STORE_CTX_get0_param(ctx);
if (verify_param == NULL) {
DEBUG(SSSDBG_OP_FAILURE, "X509_VERIFY_PARAM_new failed.\n");
goto done;
}
X509_VERIFY_PARAM_clear_flags(verify_param, (X509_V_FLAG_CRL_CHECK
|X509_V_FLAG_CRL_CHECK_ALL));
ret = X509_verify_cert(ctx);
if (ret != 1) {
DEBUG(SSSDBG_OP_FAILURE,
"X509_verify_cert failed [%d].\n", ret);
ret = X509_STORE_CTX_get_error(ctx);
DEBUG(SSSDBG_OP_FAILURE, "X509_verify_cert failed [%d][%s].\n",
ret,
X509_verify_cert_error_string(ret));
goto done;
}
DEBUG(SSSDBG_TRACE_ALL,
"Certificate valid after ignoring expired CRL.\n");
sss_log(SSS_LOG_CRIT, "Certificate %s is valid after ignoring "
"expired CRL because 'soft_crl' is set.\n",
tmp_str == NULL ? " - not available -"
:tmp_str);
} else {
DEBUG(SSSDBG_OP_FAILURE, "X509_verify_cert failed [%d][%s].\n",
ret, X509_verify_cert_error_string(ret));
goto done;
}
}
if (p11_ctx->cert_verify_opts->do_ocsp) {
ret = do_ocsp(p11_ctx, cert);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE, "do_ocsp failed.\n");
goto done;
}
}
res = true;
done:
talloc_free(tmp_str);
X509_STORE_CTX_free(ctx);
return res;
}
bool do_verification_b64(struct p11_ctx *p11_ctx, const char *cert_b64)
{
int ret;
X509 *cert;
bool res;
ret = b64_to_cert(cert_b64, &cert);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE, "Failed to convert certificate.\n");
return false;
}
res = do_verification(p11_ctx, cert);
X509_free(cert);
return res;
}
#define ATTR_ID 0
#define ATTR_LABEL 1
#define ATTR_CERT 2
struct cert_list {
struct cert_list *prev;
struct cert_list *next;
CK_ATTRIBUTE attributes[3];
char *id;
char *label;
X509 *cert;
char *subject_dn;
char *cert_b64;
char *uri;
CK_KEY_TYPE key_type;
CK_OBJECT_HANDLE private_key;
};
static int free_x509_cert(struct cert_list *item)
{
X509_free(item->cert);
return 0;
}
static int read_certs(TALLOC_CTX *mem_ctx, CK_FUNCTION_LIST *module,
CK_SESSION_HANDLE session, struct p11_ctx *p11_ctx,
struct cert_list **cert_list)
{
int ret;
size_t c;
CK_RV rv;
struct cert_list *list = NULL;
struct cert_list *item;
X509_NAME *tmp_name;
char *tmp_name_str;
CK_OBJECT_CLASS cert_class = CKO_CERTIFICATE;
CK_CERTIFICATE_TYPE cert_type = CKC_X_509;
CK_ATTRIBUTE cert_find_template[] = {
{CKA_CLASS, &cert_class, sizeof(CK_OBJECT_CLASS)} ,
{CKA_CERTIFICATE_TYPE, &cert_type, sizeof(CK_CERTIFICATE_TYPE)}
};
CK_ULONG obj_count;
CK_OBJECT_HANDLE obj;
rv = module->C_FindObjectsInit(session, cert_find_template, 2);
if (rv != CKR_OK) {
DEBUG(SSSDBG_OP_FAILURE ,"C_FindObjectsInit failed [%lu][%s].\n",
rv, p11_kit_strerror(rv));
return EIO;
}
do {
rv = module->C_FindObjects(session, &obj, 1, &obj_count);
if (rv != CKR_OK) {
DEBUG(SSSDBG_OP_FAILURE ,"C_FindObject failed [%lu][%s].\n",
rv, p11_kit_strerror(rv));
ret = EIO;
goto done;
}
if (obj_count != 0) {
item = talloc_zero(mem_ctx, struct cert_list);
if (item == NULL) {
DEBUG(SSSDBG_OP_FAILURE, "talloc_zero failed.\n");
ret = ENOMEM;
goto done;
}
item->attributes[0].type = CKA_ID;
item->attributes[1].type = CKA_LABEL;
item->attributes[2].type = CKA_VALUE;
rv = module->C_GetAttributeValue(session, obj, item->attributes, 3);
if (rv != CKR_OK) {
DEBUG(SSSDBG_OP_FAILURE,
"C_GetAttributeValue failed [%lu][%s].\n",
rv, p11_kit_strerror(rv));
ret = EIO;
goto done;
}
if (item->attributes[0].ulValueLen == -1
|| item->attributes[1].ulValueLen == -1
|| item->attributes[2].ulValueLen == -1) {
DEBUG(SSSDBG_OP_FAILURE,
"One of the needed attributes cannot be read.\n");
ret = EIO;
goto done;
}
item->attributes[0].pValue = talloc_size(item,
item->attributes[0].ulValueLen);
item->attributes[1].pValue = talloc_size(item,
item->attributes[1].ulValueLen);
item->attributes[2].pValue = talloc_size(item,
item->attributes[2].ulValueLen);
if (item->attributes[0].pValue == NULL
|| item->attributes[1].pValue == NULL
|| item->attributes[2].pValue == NULL) {
DEBUG(SSSDBG_OP_FAILURE, "talloc_size failed.\n");
ret = ENOMEM;
goto done;
}
rv = module->C_GetAttributeValue(session, obj, item->attributes, 3);
if (rv != CKR_OK) {
DEBUG(SSSDBG_OP_FAILURE,
"C_GetAttributeValue failed [%lu][%s].\n",
rv, p11_kit_strerror(rv));
ret = EIO;
goto done;
}
item->label = talloc_strndup(item, item->attributes[1].pValue,
item->attributes[1].ulValueLen);
if (item->label == NULL) {
DEBUG(SSSDBG_OP_FAILURE, "talloc_strndup failed.\n");