ts_rsp_sign.c 32.4 KB
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/* crypto/ts/ts_resp_sign.c */
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/*
 * Written by Zoltan Glozik (zglozik@stones.com) for the OpenSSL project
 * 2002.
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 */
/* ====================================================================
 * Copyright (c) 2006 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
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 *    notice, this list of conditions and the following disclaimer.
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 *
 * 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).
 *
 */

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#include "internal/cryptlib.h"
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#if defined(OPENSSL_SYS_UNIX)
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# include <sys/time.h>
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#endif

#include <openssl/objects.h>
#include <openssl/ts.h>
#include <openssl/pkcs7.h>
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#include "ts_lcl.h"
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/* 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 *);

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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,
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                                            ASN1_OBJECT *policy);
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static int ts_RESP_process_extensions(TS_RESP_CTX *ctx);
static int ts_RESP_sign(TS_RESP_CTX *ctx);
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static ESS_SIGNING_CERT *ess_SIGNING_CERT_new_init(X509 *signcert,
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                                                   STACK_OF(X509) *certs);
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static ESS_CERT_ID *ess_CERT_ID_new_init(X509 *cert, int issuer_needed);
static int ts_TST_INFO_content_new(PKCS7 *p7);
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static int ESS_add_signing_cert(PKCS7_SIGNER_INFO *si, ESS_SIGNING_CERT *sc);

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static ASN1_GENERALIZEDTIME
*TS_RESP_set_genTime_with_precision(ASN1_GENERALIZEDTIME *, long, long,
                                    unsigned);
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/* Default callbacks for response generation. */

static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *ctx, void *data)
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{
    ASN1_INTEGER *serial = ASN1_INTEGER_new();
    if (!serial)
        goto err;
    if (!ASN1_INTEGER_set(serial, 1))
        goto err;
    return serial;
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 err:
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    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;
}
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#if defined(OPENSSL_SYS_UNIX)

/* Use the gettimeofday function call. */
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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;
}
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#else

/* Use the time function call that provides only seconds precision. */
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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;
}
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#endif

static int def_extension_cb(struct TS_resp_ctx *ctx, X509_EXTENSION *ext,
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                            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;
}
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/* TS_RESP_CTX management functions. */

TS_RESP_CTX *TS_RESP_CTX_new()
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{
    TS_RESP_CTX *ctx;
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    if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) == NULL) {
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        TSerr(TS_F_TS_RESP_CTX_NEW, ERR_R_MALLOC_FAILURE);
        return NULL;
    }
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    /* Setting default callbacks. */
    ctx->serial_cb = def_serial_cb;
    ctx->time_cb = def_time_cb;
    ctx->extension_cb = def_extension_cb;
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    return ctx;
}
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void TS_RESP_CTX_free(TS_RESP_CTX *ctx)
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{
    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);
}
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int TS_RESP_CTX_set_signer_cert(TS_RESP_CTX *ctx, X509 *signer)
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{
    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;
    }
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    X509_free(ctx->signer_cert);
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    ctx->signer_cert = signer;
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    X509_up_ref(ctx->signer_cert);
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    return 1;
}
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int TS_RESP_CTX_set_signer_key(TS_RESP_CTX *ctx, EVP_PKEY *key)
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{
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    EVP_PKEY_free(ctx->signer_key);
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    ctx->signer_key = key;
    CRYPTO_add(&ctx->signer_key->references, +1, CRYPTO_LOCK_EVP_PKEY);
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    return 1;
}
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int TS_RESP_CTX_set_def_policy(TS_RESP_CTX *ctx, ASN1_OBJECT *def_policy)
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{
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    ASN1_OBJECT_free(ctx->default_policy);
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    if ((ctx->default_policy = OBJ_dup(def_policy)) == NULL)
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        goto err;
    return 1;
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 err:
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    TSerr(TS_F_TS_RESP_CTX_SET_DEF_POLICY, ERR_R_MALLOC_FAILURE);
    return 0;
}
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int TS_RESP_CTX_set_certs(TS_RESP_CTX *ctx, STACK_OF(X509) *certs)
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{

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    sk_X509_pop_free(ctx->certs, X509_free);
    ctx->certs = NULL;
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    if (!certs)
        return 1;
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    if ((ctx->certs = X509_chain_up_ref(certs)) == NULL) {
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        TSerr(TS_F_TS_RESP_CTX_SET_CERTS, ERR_R_MALLOC_FAILURE);
        return 0;
    }

    return 1;
}
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int TS_RESP_CTX_add_policy(TS_RESP_CTX *ctx, ASN1_OBJECT *policy)
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{
    ASN1_OBJECT *copy = NULL;

    /* Create new policy stack if necessary. */
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    if (ctx->policies == NULL
        && (ctx->policies = sk_ASN1_OBJECT_new_null()) == NULL)
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        goto err;
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    if ((copy = OBJ_dup(policy)) == NULL)
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        goto err;
    if (!sk_ASN1_OBJECT_push(ctx->policies, copy))
        goto err;

    return 1;
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 err:
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    TSerr(TS_F_TS_RESP_CTX_ADD_POLICY, ERR_R_MALLOC_FAILURE);
    ASN1_OBJECT_free(copy);
    return 0;
}
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int TS_RESP_CTX_add_md(TS_RESP_CTX *ctx, const EVP_MD *md)
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{
    /* Create new md stack if necessary. */
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    if (ctx->mds == NULL
        && (ctx->mds = sk_EVP_MD_new_null()) == NULL)
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        goto err;
    /* Add the shared md, no copy needed. */
    if (!sk_EVP_MD_push(ctx->mds, (EVP_MD *)md))
        goto err;

    return 1;
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 err:
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    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);
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    if (secs
        && ((ctx->seconds = ASN1_INTEGER_new()) == NULL
            || !ASN1_INTEGER_set(ctx->seconds, secs)))
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        goto err;
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    if (millis
        && ((ctx->millis = ASN1_INTEGER_new()) == NULL
            || !ASN1_INTEGER_set(ctx->millis, millis)))
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        goto err;
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    if (micros
        && ((ctx->micros = ASN1_INTEGER_new()) == NULL
            || !ASN1_INTEGER_set(ctx->micros, micros)))
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        goto err;

    return 1;
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    TS_RESP_CTX_accuracy_free(ctx);
    TSerr(TS_F_TS_RESP_CTX_SET_ACCURACY, ERR_R_MALLOC_FAILURE);
    return 0;
}
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void TS_RESP_CTX_add_flags(TS_RESP_CTX *ctx, int flags)
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{
    ctx->flags |= flags;
}
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void TS_RESP_CTX_set_serial_cb(TS_RESP_CTX *ctx, TS_serial_cb cb, void *data)
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{
    ctx->serial_cb = cb;
    ctx->serial_cb_data = data;
}
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void TS_RESP_CTX_set_time_cb(TS_RESP_CTX *ctx, TS_time_cb cb, void *data)
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{
    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;

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    if ((si = TS_STATUS_INFO_new()) == NULL)
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        goto err;
    if (!ASN1_INTEGER_set(si->status, status))
        goto err;
    if (text) {
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        if ((utf8_text = ASN1_UTF8STRING_new()) == NULL
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            || !ASN1_STRING_set(utf8_text, text, strlen(text)))
            goto err;
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        if (si->text == NULL
            && (si->text = sk_ASN1_UTF8STRING_new_null()) == NULL)
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            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;
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    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;
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    TS_STATUS_INFO *si = ctx->response->status_info;
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    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;
}
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int TS_RESP_CTX_add_failure_info(TS_RESP_CTX *ctx, int failure)
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{
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    TS_STATUS_INFO *si = ctx->response->status_info;
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    if (si->failure_info == NULL
        && (si->failure_info = ASN1_BIT_STRING_new()) == NULL)
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        goto err;
    if (!ASN1_BIT_STRING_set_bit(si->failure_info, failure, 1))
        goto err;
    return 1;
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 err:
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    TSerr(TS_F_TS_RESP_CTX_ADD_FAILURE_INFO, ERR_R_MALLOC_FAILURE);
    return 0;
}
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TS_REQ *TS_RESP_CTX_get_request(TS_RESP_CTX *ctx)
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{
    return ctx->request;
}
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TS_TST_INFO *TS_RESP_CTX_get_tst_info(TS_RESP_CTX *ctx)
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{
    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;
}
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/* Main entry method of the response generation. */
TS_RESP *TS_RESP_create_response(TS_RESP_CTX *ctx, BIO *req_bio)
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{
    ASN1_OBJECT *policy;
    TS_RESP *response;
    int result = 0;

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    ts_RESP_CTX_init(ctx);
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    /* Creating the response object. */
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    if ((ctx->response = TS_RESP_new()) == NULL) {
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        TSerr(TS_F_TS_RESP_CREATE_RESPONSE, ERR_R_MALLOC_FAILURE);
        goto end;
    }

    /* Parsing DER request. */
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    if ((ctx->request = d2i_TS_REQ_bio(req_bio, NULL)) == NULL) {
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        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. */
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    if (!ts_RESP_check_request(ctx))
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        goto end;

    /* Checking acceptable policies. */
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    if ((policy = ts_RESP_get_policy(ctx)) == NULL)
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        goto end;

    /* Creating the TS_TST_INFO object. */
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    if ((ctx->tst_info = ts_RESP_create_tst_info(ctx, policy)) == NULL)
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        goto end;

    /* Processing extensions. */
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    if (!ts_RESP_process_extensions(ctx))
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        goto end;

    /* Generating the signature. */
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    if (!ts_RESP_sign(ctx))
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        goto end;

    /* Everything was successful. */
    result = 1;
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    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. */
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    ts_RESP_CTX_cleanup(ctx);
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    return response;
}
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/* Initializes the variable part of the context. */
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static void ts_RESP_CTX_init(TS_RESP_CTX *ctx)
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{
    ctx->request = NULL;
    ctx->response = NULL;
    ctx->tst_info = NULL;
}
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/* Cleans up the variable part of the context. */
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static void ts_RESP_CTX_cleanup(TS_RESP_CTX *ctx)
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{
    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;
}
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/* Checks the format and content of the request. */
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static int ts_RESP_check_request(TS_RESP_CTX *ctx)
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{
    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. */
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    msg_imprint = request->msg_imprint;
    md_alg = msg_imprint->hash_algo;
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    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. */
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    digest = msg_imprint->hashed_msg;
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    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;
}
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/* Returns the TSA policy based on the requested and acceptable policies. */
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static ASN1_OBJECT *ts_RESP_get_policy(TS_RESP_CTX *ctx)
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{
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    ASN1_OBJECT *requested = ctx->request->policy_id;
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    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;
}
598 599

/* Creates the TS_TST_INFO object based on the settings of the context. */
R
Rich Salz 已提交
600
static TS_TST_INFO *ts_RESP_create_tst_info(TS_RESP_CTX *ctx,
601 602 603 604 605 606 607 608 609 610 611
                                            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;

612
    if ((tst_info = TS_TST_INFO_new()) == NULL)
613 614 615 616 617 618 619
        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;
620
    if ((serial = ctx->serial_cb(ctx, ctx->serial_cb_data)) == NULL
621 622
        || !TS_TST_INFO_set_serial(tst_info, serial))
        goto end;
623 624 625 626
    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)) == NULL
627 628 629 630 631
        || !TS_TST_INFO_set_time(tst_info, asn1_time))
        goto end;

    /* Setting accuracy if needed. */
    if ((ctx->seconds || ctx->millis || ctx->micros)
632
        && (accuracy = TS_ACCURACY_new()) == NULL)
633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649
        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. */
R
Rich Salz 已提交
650
    if ((nonce = ctx->request->nonce) != NULL
651 652 653 654 655
        && !TS_TST_INFO_set_nonce(tst_info, nonce))
        goto end;

    /* Setting TSA name to subject of signer certificate. */
    if (ctx->flags & TS_TSA_NAME) {
656
        if ((tsa_name = GENERAL_NAME_new()) == NULL)
657 658 659
            goto end;
        tsa_name->type = GEN_DIRNAME;
        tsa_name->d.dirn =
660
            X509_NAME_dup(X509_get_subject_name(ctx->signer_cert));
661 662 663 664 665 666 667
        if (!tsa_name->d.dirn)
            goto end;
        if (!TS_TST_INFO_set_tsa(tst_info, tsa_name))
            goto end;
    }

    result = 1;
668
 end:
669 670 671 672 673 674 675 676 677 678 679 680 681 682 683
    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;
}
684 685

/* Processing the extensions of the request. */
R
Rich Salz 已提交
686
static int ts_RESP_process_extensions(TS_RESP_CTX *ctx)
687
{
R
Rich Salz 已提交
688
    STACK_OF(X509_EXTENSION) *exts = ctx->request->extensions;
689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704
    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;
}
705 706

/* Functions for signing the TS_TST_INFO structure of the context. */
R
Rich Salz 已提交
707
static int ts_RESP_sign(TS_RESP_CTX *ctx)
708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724
{
    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. */
725
    if ((p7 = PKCS7_new()) == NULL) {
726 727 728 729 730 731 732 733 734 735 736
        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. */
R
Rich Salz 已提交
737
    if (ctx->request->cert_req) {
738 739 740 741 742 743 744 745 746 747
        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. */
748 749
    if ((si = PKCS7_add_signature(p7, ctx->signer_cert,
                                  ctx->signer_key, EVP_sha1())) == NULL) {
750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766
        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;
R
Rich Salz 已提交
767
    if ((sc = ess_SIGNING_CERT_new_init(ctx->signer_cert, certs)) == NULL)
768 769 770 771 772 773 774 775 776
        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. */
R
Rich Salz 已提交
777
    if (!ts_TST_INFO_content_new(p7))
778 779 780
        goto err;

    /* Add the DER encoded tst_info to the PKCS7 structure. */
781
    if ((p7bio = PKCS7_dataInit(p7, NULL)) == NULL) {
782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803
        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;
804
 err:
805 806 807 808 809 810 811 812 813 814
    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;
}

R
Rich Salz 已提交
815
static ESS_SIGNING_CERT *ess_SIGNING_CERT_new_init(X509 *signcert,
816 817 818 819 820 821 822
                                                   STACK_OF(X509) *certs)
{
    ESS_CERT_ID *cid;
    ESS_SIGNING_CERT *sc = NULL;
    int i;

    /* Creating the ESS_CERT_ID stack. */
823
    if ((sc = ESS_SIGNING_CERT_new()) == NULL)
824
        goto err;
825 826
    if (sc->cert_ids == NULL
        && (sc->cert_ids = sk_ESS_CERT_ID_new_null()) == NULL)
827 828 829
        goto err;

    /* Adding the signing certificate id. */
R
Rich Salz 已提交
830
    if ((cid = ess_CERT_ID_new_init(signcert, 0)) == NULL
831 832 833 834 835
        || !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);
R
Rich Salz 已提交
836
        if ((cid = ess_CERT_ID_new_init(cert, 1)) == NULL
837 838 839 840 841 842 843 844 845 846
            || !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;
}
847

R
Rich Salz 已提交
848
static ESS_CERT_ID *ess_CERT_ID_new_init(X509 *cert, int issuer_needed)
849 850 851 852 853 854 855
{
    ESS_CERT_ID *cid = NULL;
    GENERAL_NAME *name = NULL;

    /* Recompute SHA1 hash of certificate if necessary (side effect). */
    X509_check_purpose(cert, -1, 0);

856
    if ((cid = ESS_CERT_ID_new()) == NULL)
857 858 859 860 861 862 863 864
        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. */
865 866
        if (cid->issuer_serial == NULL
            && (cid->issuer_serial = ESS_ISSUER_SERIAL_new()) == NULL)
867 868
            goto err;
        /* Creating general name from the certificate issuer. */
869
        if ((name = GENERAL_NAME_new()) == NULL)
870 871
            goto err;
        name->type = GEN_DIRNAME;
872
        if ((name->d.dirn = X509_NAME_dup(X509_get_issuer_name(cert))) == NULL)
873 874 875 876 877 878 879
            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 =
880
              ASN1_INTEGER_dup(X509_get_serialNumber(cert))))
881 882 883 884 885 886 887 888 889 890
            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;
}
891

R
Rich Salz 已提交
892
static int ts_TST_INFO_content_new(PKCS7 *p7)
893 894 895 896 897
{
    PKCS7 *ret = NULL;
    ASN1_OCTET_STRING *octet_string = NULL;

    /* Create new encapsulated NID_id_smime_ct_TSTInfo content. */
898
    if ((ret = PKCS7_new()) == NULL)
899
        goto err;
900
    if ((ret->d.other = ASN1_TYPE_new()) == NULL)
901 902
        goto err;
    ret->type = OBJ_nid2obj(NID_id_smime_ct_TSTInfo);
903
    if ((octet_string = ASN1_OCTET_STRING_new()) == NULL)
904 905 906 907 908 909 910 911 912
        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;
913
 err:
914 915 916 917
    ASN1_OCTET_STRING_free(octet_string);
    PKCS7_free(ret);
    return 0;
}
918 919

static int ESS_add_signing_cert(PKCS7_SIGNER_INFO *si, ESS_SIGNING_CERT *sc)
920 921 922 923 924 925
{
    ASN1_STRING *seq = NULL;
    unsigned char *p, *pp = NULL;
    int len;

    len = i2d_ESS_SIGNING_CERT(sc, NULL);
926
    if ((pp = OPENSSL_malloc(len)) == NULL) {
927 928 929 930 931
        TSerr(TS_F_ESS_ADD_SIGNING_CERT, ERR_R_MALLOC_FAILURE);
        goto err;
    }
    p = pp;
    i2d_ESS_SIGNING_CERT(sc, &p);
932
    if ((seq = ASN1_STRING_new()) == NULL || !ASN1_STRING_set(seq, pp, len)) {
933 934 935 936 937 938 939 940
        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);
941
 err:
942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960
    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;
    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;

961
    if ((tm = gmtime(&time_sec)) == NULL)
962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011
        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 */
1012 1013
    if (asn1_time == NULL
        && (asn1_time = ASN1_GENERALIZEDTIME_new()) == NULL)
1014 1015 1016 1017 1018 1019 1020
        goto err;
    if (!ASN1_GENERALIZEDTIME_set_string(asn1_time, genTime_str)) {
        ASN1_GENERALIZEDTIME_free(asn1_time);
        goto err;
    }

    return asn1_time;
1021
 err:
1022 1023 1024
    TSerr(TS_F_TS_RESP_SET_GENTIME_WITH_PRECISION, TS_R_COULD_NOT_SET_TIME);
    return NULL;
}