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openssl/crypto/ts/ts_conf.c
Dr. David von Oheimb 79b2a2f2ee add OSSL_STACK_OF_X509_free() for commonly used pattern 
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/17307)
2021-12-21 12:11:49 +01:00

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/*
* Copyright 2006-2020 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (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
*/
/* We need to use some engine deprecated APIs */
#define OPENSSL_SUPPRESS_DEPRECATED
#include <string.h>
#include <openssl/crypto.h>
#include "internal/cryptlib.h"
#include <openssl/pem.h>
#include <openssl/engine.h>
#include <openssl/ts.h>
#include <openssl/conf_api.h>
/* Macro definitions for the configuration file. */
#define BASE_SECTION "tsa"
#define ENV_DEFAULT_TSA "default_tsa"
#define ENV_SERIAL "serial"
#define ENV_CRYPTO_DEVICE "crypto_device"
#define ENV_SIGNER_CERT "signer_cert"
#define ENV_CERTS "certs"
#define ENV_SIGNER_KEY "signer_key"
#define ENV_SIGNER_DIGEST "signer_digest"
#define ENV_DEFAULT_POLICY "default_policy"
#define ENV_OTHER_POLICIES "other_policies"
#define ENV_DIGESTS "digests"
#define ENV_ACCURACY "accuracy"
#define ENV_ORDERING "ordering"
#define ENV_TSA_NAME "tsa_name"
#define ENV_ESS_CERT_ID_CHAIN "ess_cert_id_chain"
#define ENV_VALUE_SECS "secs"
#define ENV_VALUE_MILLISECS "millisecs"
#define ENV_VALUE_MICROSECS "microsecs"
#define ENV_CLOCK_PRECISION_DIGITS "clock_precision_digits"
#define ENV_VALUE_YES "yes"
#define ENV_VALUE_NO "no"
#define ENV_ESS_CERT_ID_ALG "ess_cert_id_alg"
/* Function definitions for certificate and key loading. */
X509 *TS_CONF_load_cert(const char *file)
{
BIO *cert = NULL;
X509 *x = NULL;
if ((cert = BIO_new_file(file, "r")) == NULL)
goto end;
x = PEM_read_bio_X509_AUX(cert, NULL, NULL, NULL);
end:
if (x == NULL)
ERR_raise(ERR_LIB_TS, TS_R_CANNOT_LOAD_CERT);
BIO_free(cert);
return x;
}
STACK_OF(X509) *TS_CONF_load_certs(const char *file)
{
BIO *certs = NULL;
STACK_OF(X509) *othercerts = NULL;
STACK_OF(X509_INFO) *allcerts = NULL;
int i;
if ((certs = BIO_new_file(file, "r")) == NULL)
goto end;
if ((othercerts = sk_X509_new_null()) == NULL)
goto end;
allcerts = PEM_X509_INFO_read_bio(certs, NULL, NULL, NULL);
for (i = 0; i < sk_X509_INFO_num(allcerts); i++) {
X509_INFO *xi = sk_X509_INFO_value(allcerts, i);
if (xi->x509 != NULL) {
if (!X509_add_cert(othercerts, xi->x509, X509_ADD_FLAG_DEFAULT)) {
OSSL_STACK_OF_X509_free(othercerts);
othercerts = NULL;
goto end;
}
xi->x509 = NULL;
}
}
end:
if (othercerts == NULL)
ERR_raise(ERR_LIB_TS, TS_R_CANNOT_LOAD_CERT);
sk_X509_INFO_pop_free(allcerts, X509_INFO_free);
BIO_free(certs);
return othercerts;
}
EVP_PKEY *TS_CONF_load_key(const char *file, const char *pass)
{
BIO *key = NULL;
EVP_PKEY *pkey = NULL;
if ((key = BIO_new_file(file, "r")) == NULL)
goto end;
pkey = PEM_read_bio_PrivateKey(key, NULL, NULL, (char *)pass);
end:
if (pkey == NULL)
ERR_raise(ERR_LIB_TS, TS_R_CANNOT_LOAD_KEY);
BIO_free(key);
return pkey;
}
/* Function definitions for handling configuration options. */
static void ts_CONF_lookup_fail(const char *name, const char *tag)
{
ERR_raise_data(ERR_LIB_TS, TS_R_VAR_LOOKUP_FAILURE, "%s::%s", name, tag);
}
static void ts_CONF_invalid(const char *name, const char *tag)
{
ERR_raise_data(ERR_LIB_TS, TS_R_VAR_BAD_VALUE, "%s::%s", name, tag);
}
const char *TS_CONF_get_tsa_section(CONF *conf, const char *section)
{
if (!section) {
section = NCONF_get_string(conf, BASE_SECTION, ENV_DEFAULT_TSA);
if (!section)
ts_CONF_lookup_fail(BASE_SECTION, ENV_DEFAULT_TSA);
}
return section;
}
int TS_CONF_set_serial(CONF *conf, const char *section, TS_serial_cb cb,
TS_RESP_CTX *ctx)
{
int ret = 0;
char *serial = NCONF_get_string(conf, section, ENV_SERIAL);
if (!serial) {
ts_CONF_lookup_fail(section, ENV_SERIAL);
goto err;
}
TS_RESP_CTX_set_serial_cb(ctx, cb, serial);
ret = 1;
err:
return ret;
}
#ifndef OPENSSL_NO_ENGINE
int TS_CONF_set_crypto_device(CONF *conf, const char *section,
const char *device)
{
int ret = 0;
if (device == NULL)
device = NCONF_get_string(conf, section, ENV_CRYPTO_DEVICE);
if (device && !TS_CONF_set_default_engine(device)) {
ts_CONF_invalid(section, ENV_CRYPTO_DEVICE);
goto err;
}
ret = 1;
err:
return ret;
}
int TS_CONF_set_default_engine(const char *name)
{
ENGINE *e = NULL;
int ret = 0;
if (strcmp(name, "builtin") == 0)
return 1;
if ((e = ENGINE_by_id(name)) == NULL)
goto err;
if (strcmp(name, "chil") == 0)
ENGINE_ctrl(e, ENGINE_CTRL_CHIL_SET_FORKCHECK, 1, 0, 0);
if (!ENGINE_set_default(e, ENGINE_METHOD_ALL))
goto err;
ret = 1;
err:
if (!ret)
ERR_raise_data(ERR_LIB_TS, TS_R_COULD_NOT_SET_ENGINE,
"engine:%s", name);
ENGINE_free(e);
return ret;
}
#endif
int TS_CONF_set_signer_cert(CONF *conf, const char *section,
const char *cert, TS_RESP_CTX *ctx)
{
int ret = 0;
X509 *cert_obj = NULL;
if (cert == NULL) {
cert = NCONF_get_string(conf, section, ENV_SIGNER_CERT);
if (cert == NULL) {
ts_CONF_lookup_fail(section, ENV_SIGNER_CERT);
goto err;
}
}
if ((cert_obj = TS_CONF_load_cert(cert)) == NULL)
goto err;
if (!TS_RESP_CTX_set_signer_cert(ctx, cert_obj))
goto err;
ret = 1;
err:
X509_free(cert_obj);
return ret;
}
int TS_CONF_set_certs(CONF *conf, const char *section, const char *certs,
TS_RESP_CTX *ctx)
{
int ret = 0;
STACK_OF(X509) *certs_obj = NULL;
if (certs == NULL) {
/* Certificate chain is optional. */
if ((certs = NCONF_get_string(conf, section, ENV_CERTS)) == NULL)
goto end;
}
if ((certs_obj = TS_CONF_load_certs(certs)) == NULL)
goto err;
if (!TS_RESP_CTX_set_certs(ctx, certs_obj))
goto err;
end:
ret = 1;
err:
OSSL_STACK_OF_X509_free(certs_obj);
return ret;
}
int TS_CONF_set_signer_key(CONF *conf, const char *section,
const char *key, const char *pass,
TS_RESP_CTX *ctx)
{
int ret = 0;
EVP_PKEY *key_obj = NULL;
if (!key)
key = NCONF_get_string(conf, section, ENV_SIGNER_KEY);
if (!key) {
ts_CONF_lookup_fail(section, ENV_SIGNER_KEY);
goto err;
}
if ((key_obj = TS_CONF_load_key(key, pass)) == NULL)
goto err;
if (!TS_RESP_CTX_set_signer_key(ctx, key_obj))
goto err;
ret = 1;
err:
EVP_PKEY_free(key_obj);
return ret;
}
int TS_CONF_set_signer_digest(CONF *conf, const char *section,
const char *md, TS_RESP_CTX *ctx)
{
int ret = 0;
const EVP_MD *sign_md = NULL;
if (md == NULL)
md = NCONF_get_string(conf, section, ENV_SIGNER_DIGEST);
if (md == NULL) {
ts_CONF_lookup_fail(section, ENV_SIGNER_DIGEST);
goto err;
}
sign_md = EVP_get_digestbyname(md);
if (sign_md == NULL) {
ts_CONF_invalid(section, ENV_SIGNER_DIGEST);
goto err;
}
if (!TS_RESP_CTX_set_signer_digest(ctx, sign_md))
goto err;
ret = 1;
err:
return ret;
}
int TS_CONF_set_def_policy(CONF *conf, const char *section,
const char *policy, TS_RESP_CTX *ctx)
{
int ret = 0;
ASN1_OBJECT *policy_obj = NULL;
if (policy == NULL)
policy = NCONF_get_string(conf, section, ENV_DEFAULT_POLICY);
if (policy == NULL) {
ts_CONF_lookup_fail(section, ENV_DEFAULT_POLICY);
goto err;
}
if ((policy_obj = OBJ_txt2obj(policy, 0)) == NULL) {
ts_CONF_invalid(section, ENV_DEFAULT_POLICY);
goto err;
}
if (!TS_RESP_CTX_set_def_policy(ctx, policy_obj))
goto err;
ret = 1;
err:
ASN1_OBJECT_free(policy_obj);
return ret;
}
int TS_CONF_set_policies(CONF *conf, const char *section, TS_RESP_CTX *ctx)
{
int ret = 0;
int i;
STACK_OF(CONF_VALUE) *list = NULL;
char *policies = NCONF_get_string(conf, section, ENV_OTHER_POLICIES);
/* If no other policy is specified, that's fine. */
if (policies && (list = X509V3_parse_list(policies)) == NULL) {
ts_CONF_invalid(section, ENV_OTHER_POLICIES);
goto err;
}
for (i = 0; i < sk_CONF_VALUE_num(list); ++i) {
CONF_VALUE *val = sk_CONF_VALUE_value(list, i);
const char *extval = val->value ? val->value : val->name;
ASN1_OBJECT *objtmp;
if ((objtmp = OBJ_txt2obj(extval, 0)) == NULL) {
ts_CONF_invalid(section, ENV_OTHER_POLICIES);
goto err;
}
if (!TS_RESP_CTX_add_policy(ctx, objtmp))
goto err;
ASN1_OBJECT_free(objtmp);
}
ret = 1;
err:
sk_CONF_VALUE_pop_free(list, X509V3_conf_free);
return ret;
}
int TS_CONF_set_digests(CONF *conf, const char *section, TS_RESP_CTX *ctx)
{
int ret = 0;
int i;
STACK_OF(CONF_VALUE) *list = NULL;
char *digests = NCONF_get_string(conf, section, ENV_DIGESTS);
if (digests == NULL) {
ts_CONF_lookup_fail(section, ENV_DIGESTS);
goto err;
}
if ((list = X509V3_parse_list(digests)) == NULL) {
ts_CONF_invalid(section, ENV_DIGESTS);
goto err;
}
if (sk_CONF_VALUE_num(list) == 0) {
ts_CONF_invalid(section, ENV_DIGESTS);
goto err;
}
for (i = 0; i < sk_CONF_VALUE_num(list); ++i) {
CONF_VALUE *val = sk_CONF_VALUE_value(list, i);
const char *extval = val->value ? val->value : val->name;
const EVP_MD *md;
if ((md = EVP_get_digestbyname(extval)) == NULL) {
ts_CONF_invalid(section, ENV_DIGESTS);
goto err;
}
if (!TS_RESP_CTX_add_md(ctx, md))
goto err;
}
ret = 1;
err:
sk_CONF_VALUE_pop_free(list, X509V3_conf_free);
return ret;
}
int TS_CONF_set_accuracy(CONF *conf, const char *section, TS_RESP_CTX *ctx)
{
int ret = 0;
int i;
int secs = 0, millis = 0, micros = 0;
STACK_OF(CONF_VALUE) *list = NULL;
char *accuracy = NCONF_get_string(conf, section, ENV_ACCURACY);
if (accuracy && (list = X509V3_parse_list(accuracy)) == NULL) {
ts_CONF_invalid(section, ENV_ACCURACY);
goto err;
}
for (i = 0; i < sk_CONF_VALUE_num(list); ++i) {
CONF_VALUE *val = sk_CONF_VALUE_value(list, i);
if (strcmp(val->name, ENV_VALUE_SECS) == 0) {
if (val->value)
secs = atoi(val->value);
} else if (strcmp(val->name, ENV_VALUE_MILLISECS) == 0) {
if (val->value)
millis = atoi(val->value);
} else if (strcmp(val->name, ENV_VALUE_MICROSECS) == 0) {
if (val->value)
micros = atoi(val->value);
} else {
ts_CONF_invalid(section, ENV_ACCURACY);
goto err;
}
}
if (!TS_RESP_CTX_set_accuracy(ctx, secs, millis, micros))
goto err;
ret = 1;
err:
sk_CONF_VALUE_pop_free(list, X509V3_conf_free);
return ret;
}
int TS_CONF_set_clock_precision_digits(const CONF *conf, const char *section,
TS_RESP_CTX *ctx)
{
int ret = 0;
long digits = 0;
/*
* If not specified, set the default value to 0, i.e. sec precision
*/
digits = _CONF_get_number(conf, section, ENV_CLOCK_PRECISION_DIGITS);
if (digits < 0 || digits > TS_MAX_CLOCK_PRECISION_DIGITS) {
ts_CONF_invalid(section, ENV_CLOCK_PRECISION_DIGITS);
goto err;
}
if (!TS_RESP_CTX_set_clock_precision_digits(ctx, digits))
goto err;
return 1;
err:
return ret;
}
static int ts_CONF_add_flag(CONF *conf, const char *section,
const char *field, int flag, TS_RESP_CTX *ctx)
{
const char *value = NCONF_get_string(conf, section, field);
if (value) {
if (strcmp(value, ENV_VALUE_YES) == 0)
TS_RESP_CTX_add_flags(ctx, flag);
else if (strcmp(value, ENV_VALUE_NO) != 0) {
ts_CONF_invalid(section, field);
return 0;
}
}
return 1;
}
int TS_CONF_set_ordering(CONF *conf, const char *section, TS_RESP_CTX *ctx)
{
return ts_CONF_add_flag(conf, section, ENV_ORDERING, TS_ORDERING, ctx);
}
int TS_CONF_set_tsa_name(CONF *conf, const char *section, TS_RESP_CTX *ctx)
{
return ts_CONF_add_flag(conf, section, ENV_TSA_NAME, TS_TSA_NAME, ctx);
}
int TS_CONF_set_ess_cert_id_chain(CONF *conf, const char *section,
TS_RESP_CTX *ctx)
{
return ts_CONF_add_flag(conf, section, ENV_ESS_CERT_ID_CHAIN,
TS_ESS_CERT_ID_CHAIN, ctx);
}
int TS_CONF_set_ess_cert_id_digest(CONF *conf, const char *section,
TS_RESP_CTX *ctx)
{
int ret = 0;
const EVP_MD *cert_md = NULL;
const char *md = NCONF_get_string(conf, section, ENV_ESS_CERT_ID_ALG);
if (md == NULL)
md = "sha1";
cert_md = EVP_get_digestbyname(md);
if (cert_md == NULL) {
ts_CONF_invalid(section, ENV_ESS_CERT_ID_ALG);
goto err;
}
if (!TS_RESP_CTX_set_ess_cert_id_digest(ctx, cert_md))
goto err;
ret = 1;
err:
return ret;
}
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