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openssl1.0/crypto/ts/ts_rsp_sign.c

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Imported Upstream version 1.0.2s
2019-08-09 10:00:55 +02:00
/* crypto/ts/ts_resp_sign.c */
/*
* Written by Zoltan Glozik (zglozik@stones.com) for the OpenSSL project
* 2002.
*/
/* ====================================================================
* Copyright (c) 2006-2018 The OpenSSL Project. 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. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* licensing@OpenSSL.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED 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 OpenSSL PROJECT OR
* ITS 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.
* ====================================================================
*
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
*/
#include "cryptlib.h"
#include "o_time.h"
#if defined(OPENSSL_SYS_UNIX)
# include <sys/time.h>
#endif
#include <openssl/objects.h>
#include <openssl/ts.h>
#include <openssl/pkcs7.h>
/* Private function declarations. */
static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *, void *);
static int def_time_cb(struct TS_resp_ctx *, void *, long *sec, long *usec);
static int def_extension_cb(struct TS_resp_ctx *, X509_EXTENSION *, void *);
static void TS_RESP_CTX_init(TS_RESP_CTX *ctx);
static void TS_RESP_CTX_cleanup(TS_RESP_CTX *ctx);
static int TS_RESP_check_request(TS_RESP_CTX *ctx);
static ASN1_OBJECT *TS_RESP_get_policy(TS_RESP_CTX *ctx);
static TS_TST_INFO *TS_RESP_create_tst_info(TS_RESP_CTX *ctx,
ASN1_OBJECT *policy);
static int TS_RESP_process_extensions(TS_RESP_CTX *ctx);
static int TS_RESP_sign(TS_RESP_CTX *ctx);
static ESS_SIGNING_CERT *ESS_SIGNING_CERT_new_init(X509 *signcert,
STACK_OF(X509) *certs);
static ESS_CERT_ID *ESS_CERT_ID_new_init(X509 *cert, int issuer_needed);
static int TS_TST_INFO_content_new(PKCS7 *p7);
static int ESS_add_signing_cert(PKCS7_SIGNER_INFO *si, ESS_SIGNING_CERT *sc);
static ASN1_GENERALIZEDTIME
*TS_RESP_set_genTime_with_precision(ASN1_GENERALIZEDTIME *, long, long,
unsigned);
/* Default callbacks for response generation. */
static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *ctx, void *data)
{
ASN1_INTEGER *serial = ASN1_INTEGER_new();
if (!serial)
goto err;
if (!ASN1_INTEGER_set(serial, 1))
goto err;
return serial;
err:
TSerr(TS_F_DEF_SERIAL_CB, ERR_R_MALLOC_FAILURE);
TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
"Error during serial number generation.");
return NULL;
}
#if defined(OPENSSL_SYS_UNIX)
/* Use the gettimeofday function call. */
static int def_time_cb(struct TS_resp_ctx *ctx, void *data,
long *sec, long *usec)
{
struct timeval tv;
if (gettimeofday(&tv, NULL) != 0) {
TSerr(TS_F_DEF_TIME_CB, TS_R_TIME_SYSCALL_ERROR);
TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
"Time is not available.");
TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE);
return 0;
}
/* Return time to caller. */
*sec = tv.tv_sec;
*usec = tv.tv_usec;
return 1;
}
#else
/* Use the time function call that provides only seconds precision. */
static int def_time_cb(struct TS_resp_ctx *ctx, void *data,
long *sec, long *usec)
{
time_t t;
if (time(&t) == (time_t)-1) {
TSerr(TS_F_DEF_TIME_CB, TS_R_TIME_SYSCALL_ERROR);
TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
"Time is not available.");
TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE);
return 0;
}
/* Return time to caller, only second precision. */
*sec = (long)t;
*usec = 0;
return 1;
}
#endif
static int def_extension_cb(struct TS_resp_ctx *ctx, X509_EXTENSION *ext,
void *data)
{
/* No extensions are processed here. */
TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
"Unsupported extension.");
TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_EXTENSION);
return 0;
}
/* TS_RESP_CTX management functions. */
TS_RESP_CTX *TS_RESP_CTX_new()
{
TS_RESP_CTX *ctx;
if (!(ctx = (TS_RESP_CTX *)OPENSSL_malloc(sizeof(TS_RESP_CTX)))) {
TSerr(TS_F_TS_RESP_CTX_NEW, ERR_R_MALLOC_FAILURE);
return NULL;
}
memset(ctx, 0, sizeof(TS_RESP_CTX));
/* Setting default callbacks. */
ctx->serial_cb = def_serial_cb;
ctx->time_cb = def_time_cb;
ctx->extension_cb = def_extension_cb;
return ctx;
}
void TS_RESP_CTX_free(TS_RESP_CTX *ctx)
{
if (!ctx)
return;
X509_free(ctx->signer_cert);
EVP_PKEY_free(ctx->signer_key);
sk_X509_pop_free(ctx->certs, X509_free);
sk_ASN1_OBJECT_pop_free(ctx->policies, ASN1_OBJECT_free);
ASN1_OBJECT_free(ctx->default_policy);
sk_EVP_MD_free(ctx->mds); /* No EVP_MD_free method exists. */
ASN1_INTEGER_free(ctx->seconds);
ASN1_INTEGER_free(ctx->millis);
ASN1_INTEGER_free(ctx->micros);
OPENSSL_free(ctx);
}
int TS_RESP_CTX_set_signer_cert(TS_RESP_CTX *ctx, X509 *signer)
{
if (X509_check_purpose(signer, X509_PURPOSE_TIMESTAMP_SIGN, 0) != 1) {
TSerr(TS_F_TS_RESP_CTX_SET_SIGNER_CERT,
TS_R_INVALID_SIGNER_CERTIFICATE_PURPOSE);
return 0;
}
if (ctx->signer_cert)
X509_free(ctx->signer_cert);
ctx->signer_cert = signer;
CRYPTO_add(&ctx->signer_cert->references, +1, CRYPTO_LOCK_X509);
return 1;
}
int TS_RESP_CTX_set_signer_key(TS_RESP_CTX *ctx, EVP_PKEY *key)
{
if (ctx->signer_key)
EVP_PKEY_free(ctx->signer_key);
ctx->signer_key = key;
CRYPTO_add(&ctx->signer_key->references, +1, CRYPTO_LOCK_EVP_PKEY);
return 1;
}
int TS_RESP_CTX_set_def_policy(TS_RESP_CTX *ctx, ASN1_OBJECT *def_policy)
{
if (ctx->default_policy)
ASN1_OBJECT_free(ctx->default_policy);
if (!(ctx->default_policy = OBJ_dup(def_policy)))
goto err;
return 1;
err:
TSerr(TS_F_TS_RESP_CTX_SET_DEF_POLICY, ERR_R_MALLOC_FAILURE);
return 0;
}
int TS_RESP_CTX_set_certs(TS_RESP_CTX *ctx, STACK_OF(X509) *certs)
{
if (ctx->certs) {
sk_X509_pop_free(ctx->certs, X509_free);
ctx->certs = NULL;
}
if (!certs)
return 1;
if (!(ctx->certs = X509_chain_up_ref(certs))) {
TSerr(TS_F_TS_RESP_CTX_SET_CERTS, ERR_R_MALLOC_FAILURE);
return 0;
}
return 1;
}
int TS_RESP_CTX_add_policy(TS_RESP_CTX *ctx, ASN1_OBJECT *policy)
{
ASN1_OBJECT *copy = NULL;
/* Create new policy stack if necessary. */
if (!ctx->policies && !(ctx->policies = sk_ASN1_OBJECT_new_null()))
goto err;
if (!(copy = OBJ_dup(policy)))
goto err;
if (!sk_ASN1_OBJECT_push(ctx->policies, copy))
goto err;
return 1;
err:
TSerr(TS_F_TS_RESP_CTX_ADD_POLICY, ERR_R_MALLOC_FAILURE);
ASN1_OBJECT_free(copy);
return 0;
}
int TS_RESP_CTX_add_md(TS_RESP_CTX *ctx, const EVP_MD *md)
{
/* Create new md stack if necessary. */
if (!ctx->mds && !(ctx->mds = sk_EVP_MD_new_null()))
goto err;
/* Add the shared md, no copy needed. */
if (!sk_EVP_MD_push(ctx->mds, (EVP_MD *)md))
goto err;
return 1;
err:
TSerr(TS_F_TS_RESP_CTX_ADD_MD, ERR_R_MALLOC_FAILURE);
return 0;
}
#define TS_RESP_CTX_accuracy_free(ctx) \
ASN1_INTEGER_free(ctx->seconds); \
ctx->seconds = NULL; \
ASN1_INTEGER_free(ctx->millis); \
ctx->millis = NULL; \
ASN1_INTEGER_free(ctx->micros); \
ctx->micros = NULL;
int TS_RESP_CTX_set_accuracy(TS_RESP_CTX *ctx,
int secs, int millis, int micros)
{
TS_RESP_CTX_accuracy_free(ctx);
if (secs && (!(ctx->seconds = ASN1_INTEGER_new())
|| !ASN1_INTEGER_set(ctx->seconds, secs)))
goto err;
if (millis && (!(ctx->millis = ASN1_INTEGER_new())
|| !ASN1_INTEGER_set(ctx->millis, millis)))
goto err;
if (micros && (!(ctx->micros = ASN1_INTEGER_new())
|| !ASN1_INTEGER_set(ctx->micros, micros)))
goto err;
return 1;
err:
TS_RESP_CTX_accuracy_free(ctx);
TSerr(TS_F_TS_RESP_CTX_SET_ACCURACY, ERR_R_MALLOC_FAILURE);
return 0;
}
void TS_RESP_CTX_add_flags(TS_RESP_CTX *ctx, int flags)
{
ctx->flags |= flags;
}
void TS_RESP_CTX_set_serial_cb(TS_RESP_CTX *ctx, TS_serial_cb cb, void *data)
{
ctx->serial_cb = cb;
ctx->serial_cb_data = data;
}
void TS_RESP_CTX_set_time_cb(TS_RESP_CTX *ctx, TS_time_cb cb, void *data)
{
ctx->time_cb = cb;
ctx->time_cb_data = data;
}
void TS_RESP_CTX_set_extension_cb(TS_RESP_CTX *ctx,
TS_extension_cb cb, void *data)
{
ctx->extension_cb = cb;
ctx->extension_cb_data = data;
}
int TS_RESP_CTX_set_status_info(TS_RESP_CTX *ctx,
int status, const char *text)
{
TS_STATUS_INFO *si = NULL;
ASN1_UTF8STRING *utf8_text = NULL;
int ret = 0;
if (!(si = TS_STATUS_INFO_new()))
goto err;
if (!ASN1_INTEGER_set(si->status, status))
goto err;
if (text) {
if (!(utf8_text = ASN1_UTF8STRING_new())
|| !ASN1_STRING_set(utf8_text, text, strlen(text)))
goto err;
if (!si->text && !(si->text = sk_ASN1_UTF8STRING_new_null()))
goto err;
if (!sk_ASN1_UTF8STRING_push(si->text, utf8_text))
goto err;
utf8_text = NULL; /* Ownership is lost. */
}
if (!TS_RESP_set_status_info(ctx->response, si))
goto err;
ret = 1;
err:
if (!ret)
TSerr(TS_F_TS_RESP_CTX_SET_STATUS_INFO, ERR_R_MALLOC_FAILURE);
TS_STATUS_INFO_free(si);
ASN1_UTF8STRING_free(utf8_text);
return ret;
}
int TS_RESP_CTX_set_status_info_cond(TS_RESP_CTX *ctx,
int status, const char *text)
{
int ret = 1;
TS_STATUS_INFO *si = TS_RESP_get_status_info(ctx->response);
if (ASN1_INTEGER_get(si->status) == TS_STATUS_GRANTED) {
/* Status has not been set, set it now. */
ret = TS_RESP_CTX_set_status_info(ctx, status, text);
}
return ret;
}
int TS_RESP_CTX_add_failure_info(TS_RESP_CTX *ctx, int failure)
{
TS_STATUS_INFO *si = TS_RESP_get_status_info(ctx->response);
if (!si->failure_info && !(si->failure_info = ASN1_BIT_STRING_new()))
goto err;
if (!ASN1_BIT_STRING_set_bit(si->failure_info, failure, 1))
goto err;
return 1;
err:
TSerr(TS_F_TS_RESP_CTX_ADD_FAILURE_INFO, ERR_R_MALLOC_FAILURE);
return 0;
}
TS_REQ *TS_RESP_CTX_get_request(TS_RESP_CTX *ctx)
{
return ctx->request;
}
TS_TST_INFO *TS_RESP_CTX_get_tst_info(TS_RESP_CTX *ctx)
{
return ctx->tst_info;
}
int TS_RESP_CTX_set_clock_precision_digits(TS_RESP_CTX *ctx,
unsigned precision)
{
if (precision > TS_MAX_CLOCK_PRECISION_DIGITS)
return 0;
ctx->clock_precision_digits = precision;
return 1;
}
/* Main entry method of the response generation. */
TS_RESP *TS_RESP_create_response(TS_RESP_CTX *ctx, BIO *req_bio)
{
ASN1_OBJECT *policy;
TS_RESP *response;
int result = 0;
TS_RESP_CTX_init(ctx);
/* Creating the response object. */
if (!(ctx->response = TS_RESP_new())) {
TSerr(TS_F_TS_RESP_CREATE_RESPONSE, ERR_R_MALLOC_FAILURE);
goto end;
}
/* Parsing DER request. */
if (!(ctx->request = d2i_TS_REQ_bio(req_bio, NULL))) {
TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
"Bad request format or " "system error.");
TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT);
goto end;
}
/* Setting default status info. */
if (!TS_RESP_CTX_set_status_info(ctx, TS_STATUS_GRANTED, NULL))
goto end;
/* Checking the request format. */
if (!TS_RESP_check_request(ctx))
goto end;
/* Checking acceptable policies. */
if (!(policy = TS_RESP_get_policy(ctx)))
goto end;
/* Creating the TS_TST_INFO object. */
if (!(ctx->tst_info = TS_RESP_create_tst_info(ctx, policy)))
goto end;
/* Processing extensions. */
if (!TS_RESP_process_extensions(ctx))
goto end;
/* Generating the signature. */
if (!TS_RESP_sign(ctx))
goto end;
/* Everything was successful. */
result = 1;
end:
if (!result) {
TSerr(TS_F_TS_RESP_CREATE_RESPONSE, TS_R_RESPONSE_SETUP_ERROR);
if (ctx->response != NULL) {
if (TS_RESP_CTX_set_status_info_cond(ctx,
TS_STATUS_REJECTION,
"Error during response "
"generation.") == 0) {
TS_RESP_free(ctx->response);
ctx->response = NULL;
}
}
}
response = ctx->response;
ctx->response = NULL; /* Ownership will be returned to caller. */
TS_RESP_CTX_cleanup(ctx);
return response;
}
/* Initializes the variable part of the context. */
static void TS_RESP_CTX_init(TS_RESP_CTX *ctx)
{
ctx->request = NULL;
ctx->response = NULL;
ctx->tst_info = NULL;
}
/* Cleans up the variable part of the context. */
static void TS_RESP_CTX_cleanup(TS_RESP_CTX *ctx)
{
TS_REQ_free(ctx->request);
ctx->request = NULL;
TS_RESP_free(ctx->response);
ctx->response = NULL;
TS_TST_INFO_free(ctx->tst_info);
ctx->tst_info = NULL;
}
/* Checks the format and content of the request. */
static int TS_RESP_check_request(TS_RESP_CTX *ctx)
{
TS_REQ *request = ctx->request;
TS_MSG_IMPRINT *msg_imprint;
X509_ALGOR *md_alg;
int md_alg_id;
const ASN1_OCTET_STRING *digest;
EVP_MD *md = NULL;
int i;
/* Checking request version. */
if (TS_REQ_get_version(request) != 1) {
TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
"Bad request version.");
TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_REQUEST);
return 0;
}
/* Checking message digest algorithm. */
msg_imprint = TS_REQ_get_msg_imprint(request);
md_alg = TS_MSG_IMPRINT_get_algo(msg_imprint);
md_alg_id = OBJ_obj2nid(md_alg->algorithm);
for (i = 0; !md && i < sk_EVP_MD_num(ctx->mds); ++i) {
EVP_MD *current_md = sk_EVP_MD_value(ctx->mds, i);
if (md_alg_id == EVP_MD_type(current_md))
md = current_md;
}
if (!md) {
TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
"Message digest algorithm is "
"not supported.");
TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG);
return 0;
}
/* No message digest takes parameter. */
if (md_alg->parameter && ASN1_TYPE_get(md_alg->parameter) != V_ASN1_NULL) {
TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
"Superfluous message digest "
"parameter.");
TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG);
return 0;
}
/* Checking message digest size. */
digest = TS_MSG_IMPRINT_get_msg(msg_imprint);
if (digest->length != EVP_MD_size(md)) {
TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
"Bad message digest.");
TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT);
return 0;
}
return 1;
}
/* Returns the TSA policy based on the requested and acceptable policies. */
static ASN1_OBJECT *TS_RESP_get_policy(TS_RESP_CTX *ctx)
{
ASN1_OBJECT *requested = TS_REQ_get_policy_id(ctx->request);
ASN1_OBJECT *policy = NULL;
int i;
if (ctx->default_policy == NULL) {
TSerr(TS_F_TS_RESP_GET_POLICY, TS_R_INVALID_NULL_POINTER);
return NULL;
}
/*
* Return the default policy if none is requested or the default is
* requested.
*/
if (!requested || !OBJ_cmp(requested, ctx->default_policy))
policy = ctx->default_policy;
/* Check if the policy is acceptable. */
for (i = 0; !policy && i < sk_ASN1_OBJECT_num(ctx->policies); ++i) {
ASN1_OBJECT *current = sk_ASN1_OBJECT_value(ctx->policies, i);
if (!OBJ_cmp(requested, current))
policy = current;
}
if (!policy) {
TSerr(TS_F_TS_RESP_GET_POLICY, TS_R_UNACCEPTABLE_POLICY);
TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
"Requested policy is not " "supported.");
TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_POLICY);
}
return policy;
}
/* Creates the TS_TST_INFO object based on the settings of the context. */
static TS_TST_INFO *TS_RESP_create_tst_info(TS_RESP_CTX *ctx,
ASN1_OBJECT *policy)
{
int result = 0;
TS_TST_INFO *tst_info = NULL;
ASN1_INTEGER *serial = NULL;
ASN1_GENERALIZEDTIME *asn1_time = NULL;
long sec, usec;
TS_ACCURACY *accuracy = NULL;
const ASN1_INTEGER *nonce;
GENERAL_NAME *tsa_name = NULL;
if (!(tst_info = TS_TST_INFO_new()))
goto end;
if (!TS_TST_INFO_set_version(tst_info, 1))
goto end;
if (!TS_TST_INFO_set_policy_id(tst_info, policy))
goto end;
if (!TS_TST_INFO_set_msg_imprint(tst_info, ctx->request->msg_imprint))
goto end;
if (!(serial = (*ctx->serial_cb) (ctx, ctx->serial_cb_data))
|| !TS_TST_INFO_set_serial(tst_info, serial))
goto end;
if (!(*ctx->time_cb) (ctx, ctx->time_cb_data, &sec, &usec)
|| !(asn1_time = TS_RESP_set_genTime_with_precision(NULL,
sec, usec,
ctx->clock_precision_digits))
|| !TS_TST_INFO_set_time(tst_info, asn1_time))
goto end;
/* Setting accuracy if needed. */
if ((ctx->seconds || ctx->millis || ctx->micros)
&& !(accuracy = TS_ACCURACY_new()))
goto end;
if (ctx->seconds && !TS_ACCURACY_set_seconds(accuracy, ctx->seconds))
goto end;
if (ctx->millis && !TS_ACCURACY_set_millis(accuracy, ctx->millis))
goto end;
if (ctx->micros && !TS_ACCURACY_set_micros(accuracy, ctx->micros))
goto end;
if (accuracy && !TS_TST_INFO_set_accuracy(tst_info, accuracy))
goto end;
/* Setting ordering. */
if ((ctx->flags & TS_ORDERING)
&& !TS_TST_INFO_set_ordering(tst_info, 1))
goto end;
/* Setting nonce if needed. */
if ((nonce = TS_REQ_get_nonce(ctx->request)) != NULL
&& !TS_TST_INFO_set_nonce(tst_info, nonce))
goto end;
/* Setting TSA name to subject of signer certificate. */
if (ctx->flags & TS_TSA_NAME) {
if (!(tsa_name = GENERAL_NAME_new()))
goto end;
tsa_name->type = GEN_DIRNAME;
tsa_name->d.dirn =
X509_NAME_dup(ctx->signer_cert->cert_info->subject);
if (!tsa_name->d.dirn)
goto end;
if (!TS_TST_INFO_set_tsa(tst_info, tsa_name))
goto end;
}
result = 1;
end:
if (!result) {
TS_TST_INFO_free(tst_info);
tst_info = NULL;
TSerr(TS_F_TS_RESP_CREATE_TST_INFO, TS_R_TST_INFO_SETUP_ERROR);
TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION,
"Error during TSTInfo "
"generation.");
}
GENERAL_NAME_free(tsa_name);
TS_ACCURACY_free(accuracy);
ASN1_GENERALIZEDTIME_free(asn1_time);
ASN1_INTEGER_free(serial);
return tst_info;
}
/* Processing the extensions of the request. */
static int TS_RESP_process_extensions(TS_RESP_CTX *ctx)
{
STACK_OF(X509_EXTENSION) *exts = TS_REQ_get_exts(ctx->request);
int i;
int ok = 1;
for (i = 0; ok && i < sk_X509_EXTENSION_num(exts); ++i) {
X509_EXTENSION *ext = sk_X509_EXTENSION_value(exts, i);
/*
* XXXXX The last argument was previously (void *)ctx->extension_cb,
* but ISO C doesn't permit converting a function pointer to void *.
* For lack of better information, I'm placing a NULL there instead.
* The callback can pick its own address out from the ctx anyway...
*/
ok = (*ctx->extension_cb) (ctx, ext, NULL);
}
return ok;
}
/* Functions for signing the TS_TST_INFO structure of the context. */
static int TS_RESP_sign(TS_RESP_CTX *ctx)
{
int ret = 0;
PKCS7 *p7 = NULL;
PKCS7_SIGNER_INFO *si;
STACK_OF(X509) *certs; /* Certificates to include in sc. */
ESS_SIGNING_CERT *sc = NULL;
ASN1_OBJECT *oid;
BIO *p7bio = NULL;
int i;
/* Check if signcert and pkey match. */
if (!X509_check_private_key(ctx->signer_cert, ctx->signer_key)) {
TSerr(TS_F_TS_RESP_SIGN, TS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
goto err;
}
/* Create a new PKCS7 signed object. */
if (!(p7 = PKCS7_new())) {
TSerr(TS_F_TS_RESP_SIGN, ERR_R_MALLOC_FAILURE);
goto err;
}
if (!PKCS7_set_type(p7, NID_pkcs7_signed))
goto err;
/* Force SignedData version to be 3 instead of the default 1. */
if (!ASN1_INTEGER_set(p7->d.sign->version, 3))
goto err;
/* Add signer certificate and optional certificate chain. */
if (TS_REQ_get_cert_req(ctx->request)) {
PKCS7_add_certificate(p7, ctx->signer_cert);
if (ctx->certs) {
for (i = 0; i < sk_X509_num(ctx->certs); ++i) {
X509 *cert = sk_X509_value(ctx->certs, i);
PKCS7_add_certificate(p7, cert);
}
}
}
/* Add a new signer info. */
if (!(si = PKCS7_add_signature(p7, ctx->signer_cert,
ctx->signer_key, EVP_sha1()))) {
TSerr(TS_F_TS_RESP_SIGN, TS_R_PKCS7_ADD_SIGNATURE_ERROR);
goto err;
}
/* Add content type signed attribute to the signer info. */
oid = OBJ_nid2obj(NID_id_smime_ct_TSTInfo);
if (!PKCS7_add_signed_attribute(si, NID_pkcs9_contentType,
V_ASN1_OBJECT, oid)) {
TSerr(TS_F_TS_RESP_SIGN, TS_R_PKCS7_ADD_SIGNED_ATTR_ERROR);
goto err;
}
/*
* Create the ESS SigningCertificate attribute which contains the signer
* certificate id and optionally the certificate chain.
*/
certs = ctx->flags & TS_ESS_CERT_ID_CHAIN ? ctx->certs : NULL;
if (!(sc = ESS_SIGNING_CERT_new_init(ctx->signer_cert, certs)))
goto err;
/* Add SigningCertificate signed attribute to the signer info. */
if (!ESS_add_signing_cert(si, sc)) {
TSerr(TS_F_TS_RESP_SIGN, TS_R_ESS_ADD_SIGNING_CERT_ERROR);
goto err;
}
/* Add a new empty NID_id_smime_ct_TSTInfo encapsulated content. */
if (!TS_TST_INFO_content_new(p7))
goto err;
/* Add the DER encoded tst_info to the PKCS7 structure. */
if (!(p7bio = PKCS7_dataInit(p7, NULL))) {
TSerr(TS_F_TS_RESP_SIGN, ERR_R_MALLOC_FAILURE);
goto err;
}
/* Convert tst_info to DER. */
if (!i2d_TS_TST_INFO_bio(p7bio, ctx->tst_info)) {
TSerr(TS_F_TS_RESP_SIGN, TS_R_TS_DATASIGN);
goto err;
}
/* Create the signature and add it to the signer info. */
if (!PKCS7_dataFinal(p7, p7bio)) {
TSerr(TS_F_TS_RESP_SIGN, TS_R_TS_DATASIGN);
goto err;
}
/* Set new PKCS7 and TST_INFO objects. */
TS_RESP_set_tst_info(ctx->response, p7, ctx->tst_info);
p7 = NULL; /* Ownership is lost. */
ctx->tst_info = NULL; /* Ownership is lost. */
ret = 1;
err:
if (!ret)
TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION,
"Error during signature "
"generation.");
BIO_free_all(p7bio);
ESS_SIGNING_CERT_free(sc);
PKCS7_free(p7);
return ret;
}
static ESS_SIGNING_CERT *ESS_SIGNING_CERT_new_init(X509 *signcert,
STACK_OF(X509) *certs)
{
ESS_CERT_ID *cid;
ESS_SIGNING_CERT *sc = NULL;
int i;
/* Creating the ESS_CERT_ID stack. */
if (!(sc = ESS_SIGNING_CERT_new()))
goto err;
if (!sc->cert_ids && !(sc->cert_ids = sk_ESS_CERT_ID_new_null()))
goto err;
/* Adding the signing certificate id. */
if (!(cid = ESS_CERT_ID_new_init(signcert, 0))
|| !sk_ESS_CERT_ID_push(sc->cert_ids, cid))
goto err;
/* Adding the certificate chain ids. */
for (i = 0; i < sk_X509_num(certs); ++i) {
X509 *cert = sk_X509_value(certs, i);
if (!(cid = ESS_CERT_ID_new_init(cert, 1))
|| !sk_ESS_CERT_ID_push(sc->cert_ids, cid))
goto err;
}
return sc;
err:
ESS_SIGNING_CERT_free(sc);
TSerr(TS_F_ESS_SIGNING_CERT_NEW_INIT, ERR_R_MALLOC_FAILURE);
return NULL;
}
static ESS_CERT_ID *ESS_CERT_ID_new_init(X509 *cert, int issuer_needed)
{
ESS_CERT_ID *cid = NULL;
GENERAL_NAME *name = NULL;
/* Recompute SHA1 hash of certificate if necessary (side effect). */
X509_check_purpose(cert, -1, 0);
if (!(cid = ESS_CERT_ID_new()))
goto err;
if (!ASN1_OCTET_STRING_set(cid->hash, cert->sha1_hash,
sizeof(cert->sha1_hash)))
goto err;
/* Setting the issuer/serial if requested. */
if (issuer_needed) {
/* Creating issuer/serial structure. */
if (!cid->issuer_serial
&& !(cid->issuer_serial = ESS_ISSUER_SERIAL_new()))
goto err;
/* Creating general name from the certificate issuer. */
if (!(name = GENERAL_NAME_new()))
goto err;
name->type = GEN_DIRNAME;
if (!(name->d.dirn = X509_NAME_dup(cert->cert_info->issuer)))
goto err;
if (!sk_GENERAL_NAME_push(cid->issuer_serial->issuer, name))
goto err;
name = NULL; /* Ownership is lost. */
/* Setting the serial number. */
ASN1_INTEGER_free(cid->issuer_serial->serial);
if (!(cid->issuer_serial->serial =
ASN1_INTEGER_dup(cert->cert_info->serialNumber)))
goto err;
}
return cid;
err:
GENERAL_NAME_free(name);
ESS_CERT_ID_free(cid);
TSerr(TS_F_ESS_CERT_ID_NEW_INIT, ERR_R_MALLOC_FAILURE);
return NULL;
}
static int TS_TST_INFO_content_new(PKCS7 *p7)
{
PKCS7 *ret = NULL;
ASN1_OCTET_STRING *octet_string = NULL;
/* Create new encapsulated NID_id_smime_ct_TSTInfo content. */
if (!(ret = PKCS7_new()))
goto err;
if (!(ret->d.other = ASN1_TYPE_new()))
goto err;
ret->type = OBJ_nid2obj(NID_id_smime_ct_TSTInfo);
if (!(octet_string = ASN1_OCTET_STRING_new()))
goto err;
ASN1_TYPE_set(ret->d.other, V_ASN1_OCTET_STRING, octet_string);
octet_string = NULL;
/* Add encapsulated content to signed PKCS7 structure. */
if (!PKCS7_set_content(p7, ret))
goto err;
return 1;
err:
ASN1_OCTET_STRING_free(octet_string);
PKCS7_free(ret);
return 0;
}
static int ESS_add_signing_cert(PKCS7_SIGNER_INFO *si, ESS_SIGNING_CERT *sc)
{
ASN1_STRING *seq = NULL;
unsigned char *p, *pp = NULL;
int len;
len = i2d_ESS_SIGNING_CERT(sc, NULL);
if (!(pp = (unsigned char *)OPENSSL_malloc(len))) {
TSerr(TS_F_ESS_ADD_SIGNING_CERT, ERR_R_MALLOC_FAILURE);
goto err;
}
p = pp;
i2d_ESS_SIGNING_CERT(sc, &p);
if (!(seq = ASN1_STRING_new()) || !ASN1_STRING_set(seq, pp, len)) {
TSerr(TS_F_ESS_ADD_SIGNING_CERT, ERR_R_MALLOC_FAILURE);
goto err;
}
OPENSSL_free(pp);
pp = NULL;
return PKCS7_add_signed_attribute(si,
NID_id_smime_aa_signingCertificate,
V_ASN1_SEQUENCE, seq);
err:
ASN1_STRING_free(seq);
OPENSSL_free(pp);
return 0;
}
static ASN1_GENERALIZEDTIME
*TS_RESP_set_genTime_with_precision(ASN1_GENERALIZEDTIME *asn1_time,
long sec, long usec, unsigned precision)
{
time_t time_sec = (time_t)sec;
struct tm *tm = NULL;
struct tm result = {0};
char genTime_str[17 + TS_MAX_CLOCK_PRECISION_DIGITS];
char *p = genTime_str;
char *p_end = genTime_str + sizeof(genTime_str);
if (precision > TS_MAX_CLOCK_PRECISION_DIGITS)
goto err;
if (!(tm = OPENSSL_gmtime(&time_sec, &result)))
goto err;
/*
* Put "genTime_str" in GeneralizedTime format. We work around the
* restrictions imposed by rfc3280 (i.e. "GeneralizedTime values MUST
* NOT include fractional seconds") and OpenSSL related functions to
* meet the rfc3161 requirement: "GeneralizedTime syntax can include
* fraction-of-second details".
*/
p += BIO_snprintf(p, p_end - p,
"%04d%02d%02d%02d%02d%02d",
tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
tm->tm_hour, tm->tm_min, tm->tm_sec);
if (precision > 0) {
/* Add fraction of seconds (leave space for dot and null). */
BIO_snprintf(p, 2 + precision, ".%06ld", usec);
/*
* We cannot use the snprintf return value, because it might have
* been truncated.
*/
p += strlen(p);
/*
* To make things a bit harder, X.690 | ISO/IEC 8825-1 provides the
* following restrictions for a DER-encoding, which OpenSSL
* (specifically ASN1_GENERALIZEDTIME_check() function) doesn't
* support: "The encoding MUST terminate with a "Z" (which means
* "Zulu" time). The decimal point element, if present, MUST be the
* point option ".". The fractional-seconds elements, if present,
* MUST omit all trailing 0's; if the elements correspond to 0, they
* MUST be wholly omitted, and the decimal point element also MUST be
* omitted."
*/
/*
* Remove trailing zeros. The dot guarantees the exit condition of
* this loop even if all the digits are zero.
*/
while (*--p == '0')
/*
* empty
*/ ;
/* p points to either the dot or the last non-zero digit. */
if (*p != '.')
++p;
}
/* Add the trailing Z and the terminating null. */
*p++ = 'Z';
*p++ = '\0';
/* Now call OpenSSL to check and set our genTime value */
if (!asn1_time && !(asn1_time = M_ASN1_GENERALIZEDTIME_new()))
goto err;
if (!ASN1_GENERALIZEDTIME_set_string(asn1_time, genTime_str)) {
ASN1_GENERALIZEDTIME_free(asn1_time);
goto err;
}
return asn1_time;
err:
TSerr(TS_F_TS_RESP_SET_GENTIME_WITH_PRECISION, TS_R_COULD_NOT_SET_TIME);
return NULL;
}
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