/*

 * Copyright 2006-2020 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the OpenSSL license (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

#include <openssl/opensslconf.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include "apps.h"

#include "progs.h"

#include <openssl/bio.h>

#include <openssl/err.h>

#include <openssl/pem.h>

#include <openssl/rand.h>

#include <openssl/ts.h>

#include <openssl/bn.h>

/* Request nonce length, in bits (must be a multiple of 8). */

#define NONCE_LENGTH            64

/* Name of config entry that defines the OID file. */

#define ENV_OID_FILE            "oid_file"

/* Is |EXACTLY_ONE| of three pointers set? */

#define EXACTLY_ONE(a, b, c) \

        (( a && !b && !c) || \

         ( b && !a && !c) || \

         ( c && !a && !b))

static ASN1_OBJECT *txt2obj(const char *oid);

static CONF *load_config_file(const char *configfile);

/* Query related functions. */

static int query_command(const char *data, const char *digest,

                         const EVP_MD *md, const char *policy, int no_nonce,

                         int cert, const char *in, const char *out, int text);

static TS_REQ *create_query(BIO *data_bio, const char *digest, const EVP_MD *md,

                            const char *policy, int no_nonce, int cert);

static int create_digest(BIO *input, const char *digest,

                         const EVP_MD *md, unsigned char **md_value);

static ASN1_INTEGER *create_nonce(int bits);

/* Reply related functions. */

static int reply_command(CONF *conf, const char *section, const char *engine,

                         const char *queryfile, const char *passin, const char *inkey,

                         const EVP_MD *md, const char *signer, const char *chain,

                         const char *policy, const char *in, int token_in,

                         const char *out, int token_out, int text);

static TS_RESP *read_PKCS7(BIO *in_bio);

static TS_RESP *create_response(CONF *conf, const char *section, const char *engine,

                                const char *queryfile, const char *passin,

                                const char *inkey, const EVP_MD *md, const char *signer,

                                const char *chain, const char *policy);

static ASN1_INTEGER *serial_cb(TS_RESP_CTX *ctx, void *data);

static ASN1_INTEGER *next_serial(const char *serialfile);

static int save_ts_serial(const char *serialfile, ASN1_INTEGER *serial);

/* Verify related functions. */

static int verify_command(const char *data, const char *digest, const char *queryfile,

                          const char *in, int token_in,

                          const char *CApath, const char *CAfile, const char *untrusted,

                          X509_VERIFY_PARAM *vpm);

static TS_VERIFY_CTX *create_verify_ctx(const char *data, const char *digest,

                                        const char *queryfile,

                                        const char *CApath, const char *CAfile,

                                        const char *untrusted,

                                        X509_VERIFY_PARAM *vpm);

static X509_STORE *create_cert_store(const char *CApath, const char *CAfile,

                                     X509_VERIFY_PARAM *vpm);

static int verify_cb(int ok, X509_STORE_CTX *ctx);

typedef enum OPTION_choice {

    OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,

    OPT_ENGINE, OPT_CONFIG, OPT_SECTION, OPT_QUERY, OPT_DATA,

    OPT_DIGEST, OPT_TSPOLICY, OPT_NO_NONCE, OPT_CERT,

    OPT_IN, OPT_TOKEN_IN, OPT_OUT, OPT_TOKEN_OUT, OPT_TEXT,

    OPT_REPLY, OPT_QUERYFILE, OPT_PASSIN, OPT_INKEY, OPT_SIGNER,

    OPT_CHAIN, OPT_VERIFY, OPT_CAPATH, OPT_CAFILE, OPT_UNTRUSTED,

    OPT_MD, OPT_V_ENUM, OPT_R_ENUM

} OPTION_CHOICE;

const OPTIONS ts_options[] = {

    {"help", OPT_HELP, '-', "Display this summary"},

    {"config", OPT_CONFIG, '<', "Configuration file"},

    {"section", OPT_SECTION, 's', "Section to use within config file"},

    {"query", OPT_QUERY, '-', "Generate a TS query"},

    {"data", OPT_DATA, '<', "File to hash"},

    {"digest", OPT_DIGEST, 's', "Digest (as a hex string)"},

    OPT_R_OPTIONS,

    {"tspolicy", OPT_TSPOLICY, 's', "Policy OID to use"},

    {"no_nonce", OPT_NO_NONCE, '-', "Do not include a nonce"},

    {"cert", OPT_CERT, '-', "Put cert request into query"},

    {"in", OPT_IN, '<', "Input file"},

    {"token_in", OPT_TOKEN_IN, '-', "Input is a PKCS#7 file"},

    {"out", OPT_OUT, '>', "Output file"},

    {"token_out", OPT_TOKEN_OUT, '-', "Output is a PKCS#7 file"},

    {"text", OPT_TEXT, '-', "Output text (not DER)"},

    {"reply", OPT_REPLY, '-', "Generate a TS reply"},

    {"queryfile", OPT_QUERYFILE, '<', "File containing a TS query"},

    {"passin", OPT_PASSIN, 's', "Input file pass phrase source"},

    {"inkey", OPT_INKEY, 's', "File with private key for reply"},

    {"signer", OPT_SIGNER, 's', "Signer certificate file"},

    {"chain", OPT_CHAIN, '<', "File with signer CA chain"},

    {"verify", OPT_VERIFY, '-', "Verify a TS response"},

    {"CApath", OPT_CAPATH, '/', "Path to trusted CA files"},

    {"CAfile", OPT_CAFILE, '<', "File with trusted CA certs"},

    {"untrusted", OPT_UNTRUSTED, '<', "File with untrusted certs"},

    {"", OPT_MD, '-', "Any supported digest"},

#ifndef OPENSSL_NO_ENGINE

    {"engine", OPT_ENGINE, 's', "Use engine, possibly a hardware device"},

#endif

    {OPT_HELP_STR, 1, '-', "\nOptions specific to 'ts -verify': \n"},

    OPT_V_OPTIONS,

    {OPT_HELP_STR, 1, '-', "\n"},

    {NULL}

};

/*

 * This command is so complex, special help is needed.

 */

static char* opt_helplist[] = {

    "Typical uses:",

    "ts -query [-rand file...] [-config file] [-data file]",

    "          [-digest hexstring] [-tspolicy oid] [-no_nonce] [-cert]",

    "          [-in file] [-out file] [-text]",

    "  or",

    "ts -reply [-config file] [-section tsa_section]",

    "          [-queryfile file] [-passin password]",

    "          [-signer tsa_cert.pem] [-inkey private_key.pem]",

    "          [-chain certs_file.pem] [-tspolicy oid]",

    "          [-in file] [-token_in] [-out file] [-token_out]",

#ifndef OPENSSL_NO_ENGINE

    "          [-text] [-engine id]",

#else

    "          [-text]",

#endif

    "  or",

    "ts -verify -CApath dir -CAfile file.pem -untrusted file.pem",

    "           [-data file] [-digest hexstring]",

    "           [-queryfile file] -in file [-token_in]",

    "           [[options specific to 'ts -verify']]",

    NULL,

};

int ts_main(int argc, char **argv)

{

    CONF *conf = NULL;

    const char *CAfile = NULL, *untrusted = NULL, *prog;

    const char *configfile = default_config_file, *engine = NULL;

    const char *section = NULL;

    char **helpp;

    char *password = NULL;

    char *data = NULL, *digest = NULL, *policy = NULL;

    char *in = NULL, *out = NULL, *queryfile = NULL, *passin = NULL;

    char *inkey = NULL, *signer = NULL, *chain = NULL, *CApath = NULL;

    const EVP_MD *md = NULL;

    OPTION_CHOICE o, mode = OPT_ERR;

    int ret = 1, no_nonce = 0, cert = 0, text = 0;

    int vpmtouched = 0;

    X509_VERIFY_PARAM *vpm = NULL;

    /* Input is ContentInfo instead of TimeStampResp. */

    int token_in = 0;

    /* Output is ContentInfo instead of TimeStampResp. */

    int token_out = 0;

    if ((vpm = X509_VERIFY_PARAM_new()) == NULL)

        goto end;

    prog = opt_init(argc, argv, ts_options);

    while ((o = opt_next()) != OPT_EOF) {

        switch (o) {

        case OPT_EOF:

        case OPT_ERR:

 opthelp:

            BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);

            goto end;

        case OPT_HELP:

            opt_help(ts_options);

            for (helpp = opt_helplist; *helpp; ++helpp)

                BIO_printf(bio_err, "%s\n", *helpp);

            ret = 0;

            goto end;

        case OPT_CONFIG:

            configfile = opt_arg();

            break;

        case OPT_SECTION:

            section = opt_arg();

            break;

        case OPT_QUERY:

        case OPT_REPLY:

        case OPT_VERIFY:

            if (mode != OPT_ERR)

                goto opthelp;

            mode = o;

            break;

        case OPT_DATA:

            data = opt_arg();

            break;

        case OPT_DIGEST:

            digest = opt_arg();

            break;

        case OPT_R_CASES:

            if (!opt_rand(o))

                goto end;

            break;

        case OPT_TSPOLICY:

            policy = opt_arg();

            break;

        case OPT_NO_NONCE:

            no_nonce = 1;

            break;

        case OPT_CERT:

            cert = 1;

            break;

        case OPT_IN:

            in = opt_arg();

            break;

        case OPT_TOKEN_IN:

            token_in = 1;

            break;

        case OPT_OUT:

            out = opt_arg();

            break;

        case OPT_TOKEN_OUT:

            token_out = 1;

            break;

        case OPT_TEXT:

            text = 1;

            break;

        case OPT_QUERYFILE:

            queryfile = opt_arg();

            break;

        case OPT_PASSIN:

            passin = opt_arg();

            break;

        case OPT_INKEY:

            inkey = opt_arg();

            break;

        case OPT_SIGNER:

            signer = opt_arg();

            break;

        case OPT_CHAIN:

            chain = opt_arg();

            break;

        case OPT_CAPATH:

            CApath = opt_arg();

            break;

        case OPT_CAFILE:

            CAfile = opt_arg();

            break;

        case OPT_UNTRUSTED:

            untrusted = opt_arg();

            break;

        case OPT_ENGINE:

            engine = opt_arg();

            break;

        case OPT_MD:

            if (!opt_md(opt_unknown(), &md))

                goto opthelp;

            break;

        case OPT_V_CASES:

            if (!opt_verify(o, vpm))

                goto end;

            vpmtouched++;

            break;

        }

    }

    if (mode == OPT_ERR || opt_num_rest() != 0)

        goto opthelp;

    if (mode == OPT_REPLY && passin &&

        !app_passwd(passin, NULL, &password, NULL)) {

        BIO_printf(bio_err, "Error getting password.\n");

        goto end;

    }

    if ((conf = load_config_file(configfile)) == NULL)

        goto end;

    if (configfile != default_config_file && !app_load_modules(conf))

        goto end;

    /* Check parameter consistency and execute the appropriate function. */

    if (mode == OPT_QUERY) {

        if (vpmtouched)

            goto opthelp;

        if ((data != NULL) && (digest != NULL))

            goto opthelp;

        ret = !query_command(data, digest, md, policy, no_nonce, cert,

                             in, out, text);

    } else if (mode == OPT_REPLY) {

        if (vpmtouched)

            goto opthelp;

        if ((in != NULL) && (queryfile != NULL))

            goto opthelp;

        if (in == NULL) {

            if ((conf == NULL) || (token_in != 0))

                goto opthelp;

        }

        ret = !reply_command(conf, section, engine, queryfile,

                             password, inkey, md, signer, chain, policy,

                             in, token_in, out, token_out, text);

    } else if (mode == OPT_VERIFY) {

        if ((in == NULL) || !EXACTLY_ONE(queryfile, data, digest))

            goto opthelp;

        ret = !verify_command(data, digest, queryfile, in, token_in,

                              CApath, CAfile, untrusted,

                              vpmtouched ? vpm : NULL);

    } else {

        goto opthelp;

    }

 end:

    X509_VERIFY_PARAM_free(vpm);

    NCONF_free(conf);

    OPENSSL_free(password);

    return ret;

}

/*

 * Configuration file-related function definitions.

 */

static ASN1_OBJECT *txt2obj(const char *oid)

{

    ASN1_OBJECT *oid_obj = NULL;

    if ((oid_obj = OBJ_txt2obj(oid, 0)) == NULL)

        BIO_printf(bio_err, "cannot convert %s to OID\n", oid);

    return oid_obj;

}

static CONF *load_config_file(const char *configfile)

{

    CONF *conf = app_load_config(configfile);

    if (conf != NULL) {

        const char *p;

        BIO_printf(bio_err, "Using configuration from %s\n", configfile);

        p = NCONF_get_string(conf, NULL, ENV_OID_FILE);

        if (p != NULL) {

            BIO *oid_bio = BIO_new_file(p, "r");

            if (!oid_bio)

                ERR_print_errors(bio_err);

            else {

                OBJ_create_objects(oid_bio);

                BIO_free_all(oid_bio);

            }

        } else

            ERR_clear_error();

        if (!add_oid_section(conf))

            ERR_print_errors(bio_err);

    }

    return conf;

}

/*

 * Query-related method definitions.

 */

static int query_command(const char *data, const char *digest, const EVP_MD *md,

                         const char *policy, int no_nonce,

                         int cert, const char *in, const char *out, int text)

{

    int ret = 0;

    TS_REQ *query = NULL;

    BIO *in_bio = NULL;

    BIO *data_bio = NULL;

    BIO *out_bio = NULL;

    /* Build query object. */

    if (in != NULL) {

        if ((in_bio = bio_open_default(in, 'r', FORMAT_ASN1)) == NULL)

            goto end;

        query = d2i_TS_REQ_bio(in_bio, NULL);

    } else {

        if (digest == NULL

            && (data_bio = bio_open_default(data, 'r', FORMAT_ASN1)) == NULL)

            goto end;

        query = create_query(data_bio, digest, md, policy, no_nonce, cert);

    }

    if (query == NULL)

        goto end;

    if (text) {

        if ((out_bio = bio_open_default(out, 'w', FORMAT_TEXT)) == NULL)

            goto end;

        if (!TS_REQ_print_bio(out_bio, query))

            goto end;

    } else {

        if ((out_bio = bio_open_default(out, 'w', FORMAT_ASN1)) == NULL)

            goto end;

        if (!i2d_TS_REQ_bio(out_bio, query))

            goto end;

    }

    ret = 1;

 end:

    ERR_print_errors(bio_err);

    BIO_free_all(in_bio);

    BIO_free_all(data_bio);

    BIO_free_all(out_bio);

    TS_REQ_free(query);

    return ret;

}

static TS_REQ *create_query(BIO *data_bio, const char *digest, const EVP_MD *md,

                            const char *policy, int no_nonce, int cert)

{

    int ret = 0;

    TS_REQ *ts_req = NULL;

    int len;

    TS_MSG_IMPRINT *msg_imprint = NULL;

    X509_ALGOR *algo = NULL;

    unsigned char *data = NULL;

    ASN1_OBJECT *policy_obj = NULL;

    ASN1_INTEGER *nonce_asn1 = NULL;

    if (md == NULL && (md = EVP_get_digestbyname("sha256")) == NULL)

        goto err;

    if ((ts_req = TS_REQ_new()) == NULL)

        goto err;

    if (!TS_REQ_set_version(ts_req, 1))

        goto err;

    if ((msg_imprint = TS_MSG_IMPRINT_new()) == NULL)

        goto err;

    if ((algo = X509_ALGOR_new()) == NULL)

        goto err;

    if ((algo->algorithm = OBJ_nid2obj(EVP_MD_type(md))) == NULL)

        goto err;

    if ((algo->parameter = ASN1_TYPE_new()) == NULL)

        goto err;

    algo->parameter->type = V_ASN1_NULL;

    if (!TS_MSG_IMPRINT_set_algo(msg_imprint, algo))

        goto err;

    if ((len = create_digest(data_bio, digest, md, &data)) == 0)

        goto err;

    if (!TS_MSG_IMPRINT_set_msg(msg_imprint, data, len))

        goto err;

    if (!TS_REQ_set_msg_imprint(ts_req, msg_imprint))

        goto err;

    if (policy && (policy_obj = txt2obj(policy)) == NULL)

        goto err;

    if (policy_obj && !TS_REQ_set_policy_id(ts_req, policy_obj))

        goto err;

    /* Setting nonce if requested. */

    if (!no_nonce && (nonce_asn1 = create_nonce(NONCE_LENGTH)) == NULL)

        goto err;

    if (nonce_asn1 && !TS_REQ_set_nonce(ts_req, nonce_asn1))

        goto err;

    if (!TS_REQ_set_cert_req(ts_req, cert))

        goto err;

    ret = 1;

 err:

    if (!ret) {

        TS_REQ_free(ts_req);

        ts_req = NULL;

        BIO_printf(bio_err, "could not create query\n");

        ERR_print_errors(bio_err);

    }

    TS_MSG_IMPRINT_free(msg_imprint);

    X509_ALGOR_free(algo);

    OPENSSL_free(data);

    ASN1_OBJECT_free(policy_obj);

    ASN1_INTEGER_free(nonce_asn1);

    return ts_req;

}

static int create_digest(BIO *input, const char *digest, const EVP_MD *md,

                         unsigned char **md_value)

{

    int md_value_len;

    int rv = 0;

    EVP_MD_CTX *md_ctx = NULL;

    md_value_len = EVP_MD_size(md);

    if (md_value_len < 0)

        return 0;

    if (input != NULL) {

        unsigned char buffer[4096];

        int length;

        md_ctx = EVP_MD_CTX_new();

        if (md_ctx == NULL)

            return 0;

        *md_value = app_malloc(md_value_len, "digest buffer");

        if (!EVP_DigestInit(md_ctx, md))

            goto err;

        while ((length = BIO_read(input, buffer, sizeof(buffer))) > 0) {

            if (!EVP_DigestUpdate(md_ctx, buffer, length))

                goto err;

        }

        if (!EVP_DigestFinal(md_ctx, *md_value, NULL))

            goto err;

        md_value_len = EVP_MD_size(md);

    } else {

        long digest_len;

        *md_value = OPENSSL_hexstr2buf(digest, &digest_len);

        if (!*md_value || md_value_len != digest_len) {

            OPENSSL_free(*md_value);

            *md_value = NULL;

            BIO_printf(bio_err, "bad digest, %d bytes "

                       "must be specified\n", md_value_len);

            return 0;

        }

    }

    rv = md_value_len;

 err:

    EVP_MD_CTX_free(md_ctx);

    return rv;

}

static ASN1_INTEGER *create_nonce(int bits)

{

    unsigned char buf[20];

    ASN1_INTEGER *nonce = NULL;

    int len = (bits - 1) / 8 + 1;

    int i;

    if (len > (int)sizeof(buf))

        goto err;

    if (RAND_bytes(buf, len) <= 0)

        goto err;

    /* Find the first non-zero byte and creating ASN1_INTEGER object. */

    for (i = 0; i < len && !buf[i]; ++i)

        continue;

    if ((nonce = ASN1_INTEGER_new()) == NULL)

        goto err;

    OPENSSL_free(nonce->data);

    nonce->length = len - i;

    nonce->data = app_malloc(nonce->length + 1, "nonce buffer");

    memcpy(nonce->data, buf + i, nonce->length);

    return nonce;

 err:

    BIO_printf(bio_err, "could not create nonce\n");

    ASN1_INTEGER_free(nonce);

    return NULL;

}

/*

 * Reply-related method definitions.

 */

static int reply_command(CONF *conf, const char *section, const char *engine,

                         const char *queryfile, const char *passin, const char *inkey,

                         const EVP_MD *md, const char *signer, const char *chain,

                         const char *policy, const char *in, int token_in,

                         const char *out, int token_out, int text)

{

    int ret = 0;

    TS_RESP *response = NULL;

    BIO *in_bio = NULL;

    BIO *query_bio = NULL;

    BIO *inkey_bio = NULL;

    BIO *signer_bio = NULL;

    BIO *out_bio = NULL;

    if (in != NULL) {

        if ((in_bio = BIO_new_file(in, "rb")) == NULL)

            goto end;

        if (token_in) {

            response = read_PKCS7(in_bio);

        } else {

            response = d2i_TS_RESP_bio(in_bio, NULL);

        }

    } else {

        response = create_response(conf, section, engine, queryfile,

                                   passin, inkey, md, signer, chain, policy);

        if (response != NULL)

            BIO_printf(bio_err, "Response has been generated.\n");

        else

            BIO_printf(bio_err, "Response is not generated.\n");

    }

    if (response == NULL)

        goto end;

    /* Write response. */

    if (text) {

        if ((out_bio = bio_open_default(out, 'w', FORMAT_TEXT)) == NULL)

        goto end;

        if (token_out) {

            TS_TST_INFO *tst_info = TS_RESP_get_tst_info(response);

            if (!TS_TST_INFO_print_bio(out_bio, tst_info))

                goto end;

        } else {

            if (!TS_RESP_print_bio(out_bio, response))

                goto end;

        }

    } else {

        if ((out_bio = bio_open_default(out, 'w', FORMAT_ASN1)) == NULL)

            goto end;

        if (token_out) {

            PKCS7 *token = TS_RESP_get_token(response);

            if (!i2d_PKCS7_bio(out_bio, token))

                goto end;

        } else {

            if (!i2d_TS_RESP_bio(out_bio, response))

                goto end;

        }

    }

    ret = 1;

 end:

    ERR_print_errors(bio_err);

    BIO_free_all(in_bio);

    BIO_free_all(query_bio);

    BIO_free_all(inkey_bio);

    BIO_free_all(signer_bio);

    BIO_free_all(out_bio);

    TS_RESP_free(response);

    return ret;

}

/* Reads a PKCS7 token and adds default 'granted' status info to it. */

static TS_RESP *read_PKCS7(BIO *in_bio)

{

    int ret = 0;

    PKCS7 *token = NULL;

    TS_TST_INFO *tst_info = NULL;

    TS_RESP *resp = NULL;

    TS_STATUS_INFO *si = NULL;

    if ((token = d2i_PKCS7_bio(in_bio, NULL)) == NULL)

        goto end;

    if ((tst_info = PKCS7_to_TS_TST_INFO(token)) == NULL)

        goto end;

    if ((resp = TS_RESP_new()) == NULL)

        goto end;

    if ((si = TS_STATUS_INFO_new()) == NULL)

        goto end;

    if (!TS_STATUS_INFO_set_status(si, TS_STATUS_GRANTED))

        goto end;

    if (!TS_RESP_set_status_info(resp, si))

        goto end;

    TS_RESP_set_tst_info(resp, token, tst_info);

    token = NULL;               /* Ownership is lost. */

    tst_info = NULL;            /* Ownership is lost. */

    ret = 1;

 end:

    PKCS7_free(token);

    TS_TST_INFO_free(tst_info);

    if (!ret) {

        TS_RESP_free(resp);

        resp = NULL;

    }

    TS_STATUS_INFO_free(si);

    return resp;

}

static TS_RESP *create_response(CONF *conf, const char *section, const char *engine,

                                const char *queryfile, const char *passin,

                                const char *inkey, const EVP_MD *md, const char *signer,

                                const char *chain, const char *policy)

{

    int ret = 0;

    TS_RESP *response = NULL;

    BIO *query_bio = NULL;

    TS_RESP_CTX *resp_ctx = NULL;

    if ((query_bio = BIO_new_file(queryfile, "rb")) == NULL)

        goto end;

    if ((section = TS_CONF_get_tsa_section(conf, section)) == NULL)

        goto end;

    if ((resp_ctx = TS_RESP_CTX_new()) == NULL)

        goto end;

    if (!TS_CONF_set_serial(conf, section, serial_cb, resp_ctx))

        goto end;

#ifndef OPENSSL_NO_ENGINE

    if (!TS_CONF_set_crypto_device(conf, section, engine))

        goto end;

#endif

    if (!TS_CONF_set_signer_cert(conf, section, signer, resp_ctx))

        goto end;

    if (!TS_CONF_set_certs(conf, section, chain, resp_ctx))

        goto end;

    if (!TS_CONF_set_signer_key(conf, section, inkey, passin, resp_ctx))

        goto end;

    if (md) {

        if (!TS_RESP_CTX_set_signer_digest(resp_ctx, md))

            goto end;

    } else if (!TS_CONF_set_signer_digest(conf, section, NULL, resp_ctx)) {

            goto end;

    }

    if (!TS_CONF_set_ess_cert_id_digest(conf, section, resp_ctx))

        goto end;

    if (!TS_CONF_set_def_policy(conf, section, policy, resp_ctx))

        goto end;

    if (!TS_CONF_set_policies(conf, section, resp_ctx))

        goto end;

    if (!TS_CONF_set_digests(conf, section, resp_ctx))

        goto end;

    if (!TS_CONF_set_accuracy(conf, section, resp_ctx))

        goto end;

    if (!TS_CONF_set_clock_precision_digits(conf, section, resp_ctx))

        goto end;

    if (!TS_CONF_set_ordering(conf, section, resp_ctx))

        goto end;

    if (!TS_CONF_set_tsa_name(conf, section, resp_ctx))

        goto end;

    if (!TS_CONF_set_ess_cert_id_chain(conf, section, resp_ctx))

        goto end;

    if ((response = TS_RESP_create_response(resp_ctx, query_bio)) == NULL)

        goto end;

    ret = 1;

 end:

    if (!ret) {

        TS_RESP_free(response);

        response = NULL;

    }

    TS_RESP_CTX_free(resp_ctx);

    BIO_free_all(query_bio);

    return response;

}

static ASN1_INTEGER *serial_cb(TS_RESP_CTX *ctx, void *data)

{

    const char *serial_file = (const char *)data;

    ASN1_INTEGER *serial = next_serial(serial_file);

    if (serial == NULL) {

        TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,

                                    "Error during serial number "

                                    "generation.");

        TS_RESP_CTX_add_failure_info(ctx, TS_INFO_ADD_INFO_NOT_AVAILABLE);

    } else {

        save_ts_serial(serial_file, serial);

    }

    return serial;

}

static ASN1_INTEGER *next_serial(const char *serialfile)

{

    int ret = 0;

    BIO *in = NULL;

    ASN1_INTEGER *serial = NULL;

    BIGNUM *bn = NULL;

    if ((serial = ASN1_INTEGER_new()) == NULL)

        goto err;

    if ((in = BIO_new_file(serialfile, "r")) == NULL) {

        ERR_clear_error();

        BIO_printf(bio_err, "Warning: could not open file %s for "

                   "reading, using serial number: 1\n", serialfile);

        if (!ASN1_INTEGER_set(serial, 1))

            goto err;

    } else {

        char buf[1024];

        if (!a2i_ASN1_INTEGER(in, serial, buf, sizeof(buf))) {

            BIO_printf(bio_err, "unable to load number from %s\n",

                       serialfile);

            goto err;

        }

        if ((bn = ASN1_INTEGER_to_BN(serial, NULL)) == NULL)

            goto err;

        ASN1_INTEGER_free(serial);

        serial = NULL;

        if (!BN_add_word(bn, 1))

            goto err;

        if ((serial = BN_to_ASN1_INTEGER(bn, NULL)) == NULL)

            goto err;

    }

    ret = 1;

 err:

    if (!ret) {

        ASN1_INTEGER_free(serial);

        serial = NULL;

    }

    BIO_free_all(in);

    BN_free(bn);

    return serial;

}

static int save_ts_serial(const char *serialfile, ASN1_INTEGER *serial)

{

    int ret = 0;

    BIO *out = NULL;

    if ((out = BIO_new_file(serialfile, "w")) == NULL)

        goto err;

    if (i2a_ASN1_INTEGER(out, serial) <= 0)

        goto err;

    if (BIO_puts(out, "\n") <= 0)

        goto err;

    ret = 1;

 err:

    if (!ret)

        BIO_printf(bio_err, "could not save serial number to %s\n",

                   serialfile);

    BIO_free_all(out);

    return ret;

}

/*

 * Verify-related method definitions.

 */

static int verify_command(const char *data, const char *digest, const char *queryfile,

                          const char *in, int token_in,

                          const char *CApath, const char *CAfile, const char *untrusted,

                          X509_VERIFY_PARAM *vpm)

{

    BIO *in_bio = NULL;

    PKCS7 *token = NULL;

    TS_RESP *response = NULL;

    TS_VERIFY_CTX *verify_ctx = NULL;

    int ret = 0;

    if ((in_bio = BIO_new_file(in, "rb")) == NULL)

        goto end;

    if (token_in) {

        if ((token = d2i_PKCS7_bio(in_bio, NULL)) == NULL)

            goto end;

    } else {

        if ((response = d2i_TS_RESP_bio(in_bio, NULL)) == NULL)

            goto end;

    }

    if ((verify_ctx = create_verify_ctx(data, digest, queryfile,

                                        CApath, CAfile, untrusted,

                                        vpm)) == NULL)

        goto end;

    ret = token_in

        ? TS_RESP_verify_token(verify_ctx, token)

        : TS_RESP_verify_response(verify_ctx, response);

 end:

    printf("Verification: ");

    if (ret)

        printf("OK\n");

    else {

        printf("FAILED\n");

        ERR_print_errors(bio_err);

    }

    BIO_free_all(in_bio);

    PKCS7_free(token);

    TS_RESP_free(response);

    TS_VERIFY_CTX_free(verify_ctx);

    return ret;

}

static TS_VERIFY_CTX *create_verify_ctx(const char *data, const char *digest,

                                        const char *queryfile,

                                        const char *CApath, const char *CAfile,

                                        const char *untrusted,

                                        X509_VERIFY_PARAM *vpm)

{

    TS_VERIFY_CTX *ctx = NULL;

    BIO *input = NULL;

    TS_REQ *request = NULL;

    int ret = 0;

    int f = 0;

    if (data != NULL || digest != NULL) {

        if ((ctx = TS_VERIFY_CTX_new()) == NULL)

            goto err;

        f = TS_VFY_VERSION | TS_VFY_SIGNER;

        if (data != NULL) {