RFC 3161 compliant time stamp request creation, response generation and response verification. Submitted by: Zoltan Glozik <zglozik@opentsa.org> Reviewed by: Ulf Moeller
diff --git a/apps/ts.c b/apps/ts.c new file mode 100644 index 0000000..7edd538 --- /dev/null +++ b/apps/ts.c
@@ -0,0 +1,1143 @@ +/* apps/ts.c */ +/* Written by Zoltan Glozik (zglozik@stones.com) for the OpenSSL + * project 2002. + */ +/* ==================================================================== + * Copyright (c) 2001 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 <stdio.h> +#include <stdlib.h> +#include <string.h> +#include "apps.h" +#include <openssl/bio.h> +#include <openssl/err.h> +#include <openssl/pem.h> +#include <openssl/rand.h> +#include <openssl/ts.h> + +#undef PROG +#define PROG ts_main + +/* Length of the nonce of the request in bits (must be a multiple of 8). */ +#define NONCE_LENGTH 64 + +/* Macro definitions for the configuration file. */ +#define ENV_OID_FILE "oid_file" + +/* Local function declarations. */ + +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, char *digest, + const EVP_MD *md, const char *policy, int no_nonce, + int cert, const char *in, const char *out, int text); +static BIO *BIO_open_with_default(const char *file, const char *mode, + FILE *default_fp); +static TS_REQ *create_query(BIO *data_bio, char *digest, const EVP_MD *md, + const char *policy, int no_nonce, int cert); +static int create_digest(BIO *input, 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, char *section, char *engine, + char *queryfile, char *passin, char *inkey, + char *signer, char *chain, const char *policy, + char *in, int token_in, 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, char *engine, + char *queryfile, char *passin, char *inkey, + char *signer, char *chain, const char *policy); +static ASN1_INTEGER * MS_CALLBACK 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(char *data, char *digest, char *queryfile, + char *in, int token_in, + char *ca_path, char *ca_file, char *untrusted); +static TS_VERIFY_CTX *create_verify_ctx(char *data, char *digest, + char *queryfile, + char *ca_path, char *ca_file, + char *untrusted); +static X509_STORE *create_cert_store(char *ca_path, char *ca_file); +static int MS_CALLBACK verify_cb(int ok, X509_STORE_CTX *ctx); + +/* Main function definition. */ + +int MAIN(int argc, char **argv) + { + int ret = 1; + char *configfile = NULL; + char *section = NULL; + CONF *conf = NULL; + enum mode { + CMD_NONE, CMD_QUERY, CMD_REPLY, CMD_VERIFY + } mode = CMD_NONE; + char *data = NULL; + char *digest = NULL; + const EVP_MD *md = NULL; + char *rnd = NULL; + char *policy = NULL; + int no_nonce = 0; + int cert = 0; + char *in = NULL; + char *out = NULL; + int text = 0; + char *queryfile = NULL; + char *passin = NULL; /* Password source. */ + char *password =NULL; /* Password itself. */ + char *inkey = NULL; + char *signer = NULL; + char *chain = NULL; + char *ca_path = NULL; + char *ca_file = NULL; + char *untrusted = NULL; + char *engine = NULL; + /* Input is ContentInfo instead of TimeStampResp. */ + int token_in = 0; + /* Output is ContentInfo instead of TimeStampResp. */ + int token_out = 0; + int free_bio_err = 0; + + ERR_load_crypto_strings(); + apps_startup(); + + if (bio_err == NULL && (bio_err = BIO_new(BIO_s_file())) != NULL) + { + free_bio_err = 1; + BIO_set_fp(bio_err, stderr, BIO_NOCLOSE | BIO_FP_TEXT); + } + + for (argc--, argv++; argc > 0; argc--, argv++) + { + if (strcmp(*argv, "-config") == 0) + { + if (argc-- < 1) goto usage; + configfile = *++argv; + } + else if (strcmp(*argv, "-section") == 0) + { + if (argc-- < 1) goto usage; + section = *++argv; + } + else if (strcmp(*argv, "-query") == 0) + { + if (mode != CMD_NONE) goto usage; + mode = CMD_QUERY; + } + else if (strcmp(*argv, "-data") == 0) + { + if (argc-- < 1) goto usage; + data = *++argv; + } + else if (strcmp(*argv, "-digest") == 0) + { + if (argc-- < 1) goto usage; + digest = *++argv; + } + else if (strcmp(*argv, "-md2") == 0 + || strcmp(*argv, "-md4") == 0 + || strcmp(*argv, "-md5") == 0 + || strcmp(*argv, "-sha") == 0 + || strcmp(*argv, "-sha1") == 0 + || strcmp(*argv, "-mdc2") == 0 + || strcmp(*argv, "-ripemd160") == 0) + { + md = EVP_get_digestbyname(*argv + 1); + } + else if (strcmp(*argv, "-rand") == 0) + { + if (argc-- < 1) goto usage; + rnd = *++argv; + } + else if (strcmp(*argv, "-policy") == 0) + { + if (argc-- < 1) goto usage; + policy = *++argv; + } + else if (strcmp(*argv, "-no_nonce") == 0) + { + no_nonce = 1; + } + else if (strcmp(*argv, "-cert") == 0) + { + cert = 1; + } + else if (strcmp(*argv, "-in") == 0) + { + if (argc-- < 1) goto usage; + in = *++argv; + } + else if (strcmp(*argv, "-token_in") == 0) + { + token_in = 1; + } + else if (strcmp(*argv, "-out") == 0) + { + if (argc-- < 1) goto usage; + out = *++argv; + } + else if (strcmp(*argv, "-token_out") == 0) + { + token_out = 1; + } + else if (strcmp(*argv, "-text") == 0) + { + text = 1; + } + else if (strcmp(*argv, "-reply") == 0) + { + if (mode != CMD_NONE) goto usage; + mode = CMD_REPLY; + } + else if (strcmp(*argv, "-queryfile") == 0) + { + if (argc-- < 1) goto usage; + queryfile = *++argv; + } + else if (strcmp(*argv, "-passin") == 0) + { + if (argc-- < 1) goto usage; + passin = *++argv; + } + else if (strcmp(*argv, "-inkey") == 0) + { + if (argc-- < 1) goto usage; + inkey = *++argv; + } + else if (strcmp(*argv, "-signer") == 0) + { + if (argc-- < 1) goto usage; + signer = *++argv; + } + else if (strcmp(*argv, "-chain") == 0) + { + if (argc-- < 1) goto usage; + chain = *++argv; + } + else if (strcmp(*argv, "-verify") == 0) + { + if (mode != CMD_NONE) goto usage; + mode = CMD_VERIFY; + } + else if (strcmp(*argv, "-CApath") == 0) + { + if (argc-- < 1) goto usage; + ca_path = *++argv; + } + else if (strcmp(*argv, "-CAfile") == 0) + { + if (argc-- < 1) goto usage; + ca_file = *++argv; + } + else if (strcmp(*argv, "-untrusted") == 0) + { + if (argc-- < 1) goto usage; + untrusted = *++argv; + } + else if (strcmp(*argv, "-engine") == 0) + { + if (argc-- < 1) goto usage; + engine = *++argv; + } + else + goto usage; + } + + /* Seed the random number generator if it is going to be used. */ + if (mode == CMD_QUERY && !no_nonce) + { + if (!app_RAND_load_file(NULL, bio_err, 1) && rnd == NULL) + BIO_printf(bio_err, "warning, not much extra random " + "data, consider using the -rand option\n"); + if (rnd != NULL) + BIO_printf(bio_err,"%ld semi-random bytes loaded\n", + app_RAND_load_files(rnd)); + } + + /* Get the password if required. */ + if(mode == CMD_REPLY && passin && + !app_passwd(bio_err, passin, NULL, &password, NULL)) + { + BIO_printf(bio_err,"Error getting password.\n"); + goto cleanup; + } + + /* Check consistency of parameters and execute + the appropriate function. */ + switch (mode) + { + case CMD_NONE: + goto usage; + case CMD_QUERY: + /* Data file and message imprint cannot be specified + at the same time. */ + ret = data != NULL && digest != NULL; + if (ret) goto usage; + /* Load the config file for possible policy OIDs. */ + conf = load_config_file(configfile); + ret = !query_command(data, digest, md, policy, no_nonce, cert, + in, out, text); + break; + case CMD_REPLY: + conf = load_config_file(configfile); + if (in == NULL) + { + ret = !(queryfile != NULL && conf != NULL && !token_in); + if (ret) goto usage; + } + else + { + /* 'in' and 'queryfile' are exclusive. */ + ret = !(queryfile == NULL); + if (ret) goto usage; + } + + ret = !reply_command(conf, section, engine, queryfile, + password, inkey, signer, chain, policy, + in, token_in, out, token_out, text); + break; + case CMD_VERIFY: + ret = !(((queryfile && !data && !digest) + || (!queryfile && data && !digest) + || (!queryfile && !data && digest)) + && in != NULL); + if (ret) goto usage; + + ret = !verify_command(data, digest, queryfile, in, token_in, + ca_path, ca_file, untrusted); + } + + goto cleanup; + + usage: + BIO_printf(bio_err, "usage:\n" + "ts -query [-rand file%cfile%c...] [-config configfile] " + "[-data file_to_hash] [-digest digest_bytes]" + "[-md2|-md4|-md5|-sha|-sha1|-mdc2|-ripemd160] " + "[-policy object_id] [-no_nonce] [-cert] " + "[-in request.tsq] [-out request.tsq] [-text]\n", + LIST_SEPARATOR_CHAR, LIST_SEPARATOR_CHAR); + BIO_printf(bio_err, "or\n" + "ts -reply [-config configfile] [-section tsa_section] " + "[-queryfile request.tsq] [-passin password] " + "[-signer tsa_cert.pem] [-inkey private_key.pem] " + "[-chain certs_file.pem] [-policy object_id] " + "[-in response.tsr] [-token_in] " + "[-out response.tsr] [-token_out] [-text] [-engine id]\n"); + BIO_printf(bio_err, "or\n" + "ts -verify [-data file_to_hash] [-digest digest_bytes] " + "[-queryfile request.tsq] " + "-in response.tsr [-token_in] " + "-CApath ca_path -CAfile ca_file.pem " + "-untrusted cert_file.pem\n"); + cleanup: + /* Clean up. */ + app_RAND_write_file(NULL, bio_err); + NCONF_free(conf); + OPENSSL_free(password); + OBJ_cleanup(); + if (free_bio_err) + { + BIO_free_all(bio_err); + bio_err = NULL; + } + + OPENSSL_EXIT(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))) + BIO_printf(bio_err, "cannot convert %s to OID\n", oid); + + return oid_obj; + } + +static CONF *load_config_file(const char *configfile) + { + CONF *conf = NULL; + long errorline = -1; + + if (!configfile) configfile = getenv("OPENSSL_CONF"); + if (!configfile) configfile = getenv("SSLEAY_CONF"); + + if (configfile && + (!(conf = NCONF_new(NULL)) || + NCONF_load(conf, configfile, &errorline) <= 0)) + { + if (errorline <= 0) + BIO_printf(bio_err, "error loading the config file " + "'%s'\n", configfile); + else + BIO_printf(bio_err, "error on line %ld of config file " + "'%s'\n", errorline, 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(bio_err, conf)) + ERR_print_errors(bio_err); + } + return conf; + } + +/* + * Query-related method definitions. + */ + +static int query_command(const char *data, 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 either from file or from scratch. */ + if (in != NULL) + { + if ((in_bio = BIO_new_file(in, "rb")) == NULL) goto end; + query = d2i_TS_REQ_bio(in_bio, NULL); + } + else + { + /* Open the file if no explicit digest bytes were specified. */ + if (!digest + && !(data_bio = BIO_open_with_default(data, "rb", stdin))) + goto end; + /* Creating the query object. */ + query = create_query(data_bio, digest, md, + policy, no_nonce, cert); + /* Saving the random number generator state. */ + } + if (query == NULL) goto end; + + /* Write query either in ASN.1 or in text format. */ + if ((out_bio = BIO_open_with_default(out, "wb", stdout)) == NULL) + goto end; + if (text) + { + /* Text output. */ + if (!TS_REQ_print_bio(out_bio, query)) + goto end; + } + else + { + /* ASN.1 output. */ + if (!i2d_TS_REQ_bio(out_bio, query)) + goto end; + } + + ret = 1; + + end: + ERR_print_errors(bio_err); + + /* Clean up. */ + BIO_free_all(in_bio); + BIO_free_all(data_bio); + BIO_free_all(out_bio); + TS_REQ_free(query); + + return ret; + } + +static BIO *BIO_open_with_default(const char *file, const char *mode, + FILE *default_fp) + { + return file == NULL ? + BIO_new_fp(default_fp, BIO_NOCLOSE) + : BIO_new_file(file, mode); + } + +static TS_REQ *create_query(BIO *data_bio, 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; + + /* Setting default message digest. */ + if (!md && !(md = EVP_get_digestbyname("sha1"))) goto err; + + /* Creating request object. */ + if (!(ts_req = TS_REQ_new())) goto err; + + /* Setting version. */ + if (!TS_REQ_set_version(ts_req, 1)) goto err; + + /* Creating and adding MSG_IMPRINT object. */ + if (!(msg_imprint = TS_MSG_IMPRINT_new())) goto err; + + /* Adding algorithm. */ + if (!(algo = X509_ALGOR_new())) goto err; + if (!(algo->algorithm = OBJ_nid2obj(EVP_MD_type(md)))) goto err; + if (!(algo->parameter = ASN1_TYPE_new())) goto err; + algo->parameter->type = V_ASN1_NULL; + if (!TS_MSG_IMPRINT_set_algo(msg_imprint, algo)) goto err; + + /* Adding message digest. */ + 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; + + /* Setting policy if requested. */ + if (policy && !(policy_obj = txt2obj(policy))) 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))) goto err; + if (nonce_asn1 && !TS_REQ_set_nonce(ts_req, nonce_asn1)) goto err; + + /* Setting certificate request flag if requested. */ + 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"); + } + 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, char *digest, const EVP_MD *md, + unsigned char **md_value) + { + int md_value_len; + + md_value_len = EVP_MD_size(md); + if (input) + { + /* Digest must be computed from an input file. */ + EVP_MD_CTX md_ctx; + unsigned char buffer[4096]; + int length; + + *md_value = OPENSSL_malloc(md_value_len); + if (*md_value == 0) goto err; + + EVP_DigestInit(&md_ctx, md); + while ((length = BIO_read(input, buffer, sizeof(buffer))) > 0) + { + EVP_DigestUpdate(&md_ctx, buffer, length); + } + EVP_DigestFinal(&md_ctx, *md_value, NULL); + } + else + { + /* Digest bytes are specified with digest. */ + long digest_len; + *md_value = string_to_hex(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); + goto err; + } + } + + return md_value_len; + err: + return 0; + } + +static ASN1_INTEGER *create_nonce(int bits) + { + unsigned char buf[20]; + ASN1_INTEGER *nonce = NULL; + int len = (bits - 1) / 8 + 1; + int i; + + /* Generating random byte sequence. */ + if (len > (int)sizeof(buf)) goto err; + if (!RAND_bytes(buf, len)) goto err; + + /* Find the first non-zero byte and creating ASN1_INTEGER object. */ + for (i = 0; i < len && !buf[i]; ++i); + if (!(nonce = ASN1_INTEGER_new())) goto err; + OPENSSL_free(nonce->data); + /* Allocate at least one byte. */ + nonce->length = len - i; + if (!(nonce->data = OPENSSL_malloc(nonce->length + 1))) goto err; + 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, char *section, char *engine, + char *queryfile, char *passin, char *inkey, + char *signer, char *chain, const char *policy, + char *in, int token_in, + 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; + + /* Build response object either from response or query. */ + if (in != NULL) + { + if ((in_bio = BIO_new_file(in, "rb")) == NULL) goto end; + if (token_in) + { + /* We have a ContentInfo (PKCS7) object, add + 'granted' status info around it. */ + response = read_PKCS7(in_bio); + } + else + { + /* We have a ready-made TS_RESP object. */ + response = d2i_TS_RESP_bio(in_bio, NULL); + } + } + else + { + response = create_response(conf, section, engine, queryfile, + passin, inkey, signer, chain, + policy); + if (response) + 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 either in ASN.1 or text format. */ + if ((out_bio = BIO_open_with_default(out, "wb", stdout)) == NULL) + goto end; + if (text) + { + /* Text output. */ + 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 + { + /* ASN.1 DER output. */ + 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); + + /* Clean up. */ + 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; + + /* Read PKCS7 object and extract the signed time stamp info. */ + if (!(token = d2i_PKCS7_bio(in_bio, NULL))) goto end; + if (!(tst_info = PKCS7_to_TS_TST_INFO(token))) goto end; + + /* Creating response object. */ + if (!(resp = TS_RESP_new())) goto end; + + /* Create granted status info. */ + if (!(si = TS_STATUS_INFO_new())) goto end; + if (!(ASN1_INTEGER_set(si->status, TS_STATUS_GRANTED))) goto end; + if (!TS_RESP_set_status_info(resp, si)) goto end; + + /* Setting encapsulated token. */ + 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, char *engine, + char *queryfile, char *passin, char *inkey, + char *signer, 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"))) + goto end; + + /* Getting TSA configuration section. */ + if (!(section = TS_CONF_get_tsa_section(conf, section))) + goto end; + + /* Setting up response generation context. */ + if (!(resp_ctx = TS_RESP_CTX_new())) goto end; + + /* Setting serial number provider callback. */ + if (!TS_CONF_set_serial(conf, section, serial_cb, resp_ctx)) goto end; + + /* Setting default OpenSSL engine. */ + if (!TS_CONF_set_crypto_device(conf, section, engine)) goto end; + + /* Setting TSA signer certificate. */ + if (!TS_CONF_set_signer_cert(conf, section, signer, resp_ctx)) goto end; + + /* Setting TSA signer certificate chain. */ + if (!TS_CONF_set_certs(conf, section, chain, resp_ctx)) goto end; + + /* Setting TSA signer private key. */ + if (!TS_CONF_set_signer_key(conf, section, inkey, passin, resp_ctx)) + goto end; + + /* Setting default policy OID. */ + if (!TS_CONF_set_def_policy(conf, section, policy, resp_ctx)) goto end; + + /* Setting acceptable policy OIDs. */ + if (!TS_CONF_set_policies(conf, section, resp_ctx)) goto end; + + /* Setting the acceptable one-way hash algorithms. */ + if (!TS_CONF_set_digests(conf, section, resp_ctx)) goto end; + + /* Setting guaranteed time stamp accuracy. */ + if (!TS_CONF_set_accuracy(conf, section, resp_ctx)) goto end; + + /* Setting the precision of the time. */ + if (!TS_CONF_set_clock_precision_digits(conf, section, resp_ctx)) + goto end; + + /* Setting the ordering flaf if requested. */ + if (!TS_CONF_set_ordering(conf, section, resp_ctx)) goto end; + + /* Setting the TSA name required flag if requested. */ + if (!TS_CONF_set_tsa_name(conf, section, resp_ctx)) goto end; + + /* Setting the ESS cert id chain flag if requested. */ + if (!TS_CONF_set_ess_cert_id_chain(conf, section, resp_ctx)) goto end; + + /* Creating the response. */ + if (!(response = TS_RESP_create_response(resp_ctx, query_bio))) + 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 * MS_CALLBACK serial_cb(TS_RESP_CTX *ctx, void *data) + { + const char *serial_file = (const char *) data; + ASN1_INTEGER *serial = next_serial(serial_file); + + if (!serial) + { + 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())) goto err; + + if (!(in = BIO_new_file(serialfile, "r"))) + { + 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))) goto err; + ASN1_INTEGER_free(serial); + serial = NULL; + if (!BN_add_word(bn, 1)) goto err; + if (!(serial = BN_to_ASN1_INTEGER(bn, 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"))) 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(char *data, char *digest, char *queryfile, + char *in, int token_in, + char *ca_path, char *ca_file, char *untrusted) + { + BIO *in_bio = NULL; + PKCS7 *token = NULL; + TS_RESP *response = NULL; + TS_VERIFY_CTX *verify_ctx = NULL; + int ret = 0; + + /* Decode the token (PKCS7) or response (TS_RESP) files. */ + if (!(in_bio = BIO_new_file(in, "rb"))) goto end; + if (token_in) + { + if (!(token = d2i_PKCS7_bio(in_bio, NULL))) goto end; + } + else + { + if (!(response = d2i_TS_RESP_bio(in_bio, NULL))) goto end; + } + + if (!(verify_ctx = create_verify_ctx(data, digest, queryfile, + ca_path, ca_file, untrusted))) + goto end; + + /* Checking the token or response against the request. */ + 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"); + /* Print errors, if there are any. */ + ERR_print_errors(bio_err); + } + + /* Clean up. */ + 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(char *data, char *digest, + char *queryfile, + char *ca_path, char *ca_file, + char *untrusted) + { + TS_VERIFY_CTX *ctx = NULL; + BIO *input = NULL; + TS_REQ *request = NULL; + int ret = 0; + + if (data != NULL || digest != NULL) + { + if (!(ctx = TS_VERIFY_CTX_new())) goto err; + ctx->flags = TS_VFY_VERSION | TS_VFY_SIGNER; + if (data != NULL) + { + ctx->flags |= TS_VFY_DATA; + if (!(ctx->data = BIO_new_file(data, "rb"))) goto err; + } + else if (digest != NULL) + { + long imprint_len; + ctx->flags |= TS_VFY_IMPRINT; + if (!(ctx->imprint = string_to_hex(digest, + &imprint_len))) + { + BIO_printf(bio_err, "invalid digest string\n"); + goto err; + } + ctx->imprint_len = imprint_len; + } + + } + else if (queryfile != NULL) + { + /* The request has just to be read, decoded and converted to + a verify context object. */ + if (!(input = BIO_new_file(queryfile, "rb"))) goto err; + if (!(request = d2i_TS_REQ_bio(input, NULL))) goto err; + if (!(ctx = TS_REQ_to_TS_VERIFY_CTX(request, NULL))) goto err; + } + + /* Add the signature verification flag and arguments. */ + ctx->flags |= TS_VFY_SIGNATURE; + + /* Initialising the X509_STORE object. */ + if (!(ctx->store = create_cert_store(ca_path, ca_file))) goto err; + + /* Loading untrusted certificates. */ + if (untrusted && !(ctx->certs = TS_CONF_load_certs(untrusted))) + goto err; + + ret = 1; + err: + if (!ret) + { + TS_VERIFY_CTX_free(ctx); + ctx = NULL; + } + BIO_free_all(input); + TS_REQ_free(request); + return ctx; + } + +static X509_STORE *create_cert_store(char *ca_path, char *ca_file) + { + X509_STORE *cert_ctx = NULL; + X509_LOOKUP *lookup = NULL; + int i; + + /* Creating the X509_STORE object. */ + cert_ctx = X509_STORE_new(); + + /* Setting the callback for certificate chain verification. */ + X509_STORE_set_verify_cb_func(cert_ctx, verify_cb); + + /* Adding a trusted certificate directory source. */ + if (ca_path) + { + lookup = X509_STORE_add_lookup(cert_ctx, + X509_LOOKUP_hash_dir()); + if (lookup == NULL) + { + BIO_printf(bio_err, "memory allocation failure\n"); + goto err; + } + i = X509_LOOKUP_add_dir(lookup, ca_path, X509_FILETYPE_PEM); + if (!i) + { + BIO_printf(bio_err, "Error loading directory %s\n", + ca_path); + goto err; + } + } + + /* Adding a trusted certificate file source. */ + if (ca_file) + { + lookup = X509_STORE_add_lookup(cert_ctx, X509_LOOKUP_file()); + if (lookup == NULL) + { + BIO_printf(bio_err, "memory allocation failure\n"); + goto err; + } + i = X509_LOOKUP_load_file(lookup, ca_file, X509_FILETYPE_PEM); + if (!i) + { + BIO_printf(bio_err, "Error loading file %s\n", ca_file); + goto err; + } + } + + return cert_ctx; + err: + X509_STORE_free(cert_ctx); + return NULL; + } + +static int MS_CALLBACK verify_cb(int ok, X509_STORE_CTX *ctx) + { + /* + char buf[256]; + + if (!ok) + { + X509_NAME_oneline(X509_get_subject_name(ctx->current_cert), + buf, sizeof(buf)); + printf("%s\n", buf); + printf("error %d at %d depth lookup: %s\n", + ctx->error, ctx->error_depth, + X509_verify_cert_error_string(ctx->error)); + } + */ + + return ok; + }