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cli/vendor/aws-lc-sys/aws-lc/crypto/x509/v3_conf.c

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// Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project 1999.
// Copyright (c) 1999-2002 The OpenSSL Project. All rights reserved.
// SPDX-License-Identifier: Apache-2.0
// extension creation utilities
#include <ctype.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <openssl/conf.h>
#include <openssl/err.h>
#include <openssl/mem.h>
#include <openssl/obj.h>
#include <openssl/x509.h>
#include "../internal.h"
#include "internal.h"
static int v3_check_critical(const char **value);
static int v3_check_generic(const char **value);
static X509_EXTENSION *do_ext_nconf(const CONF *conf, const X509V3_CTX *ctx,
int ext_nid, int crit, const char *value);
static X509_EXTENSION *v3_generic_extension(const char *ext, const char *value,
int crit, int type,
const X509V3_CTX *ctx);
static X509_EXTENSION *do_ext_i2d(const X509V3_EXT_METHOD *method, int ext_nid,
int crit, void *ext_struc);
static unsigned char *generic_asn1(const char *value, const X509V3_CTX *ctx,
size_t *ext_len);
static void delete_ext(STACK_OF(X509_EXTENSION) *sk, X509_EXTENSION *dext);
X509_EXTENSION *X509V3_EXT_nconf(const CONF *conf, const X509V3_CTX *ctx,
const char *name, const char *value) {
// If omitted, fill in an empty |X509V3_CTX|.
X509V3_CTX ctx_tmp;
if (ctx == NULL) {
X509V3_set_ctx(&ctx_tmp, NULL, NULL, NULL, NULL, 0);
X509V3_set_nconf(&ctx_tmp, conf);
ctx = &ctx_tmp;
}
int crit = v3_check_critical(&value);
int ext_type = v3_check_generic(&value);
if (ext_type != 0) {
return v3_generic_extension(name, value, crit, ext_type, ctx);
}
X509_EXTENSION *ret = do_ext_nconf(conf, ctx, OBJ_sn2nid(name), crit, value);
if (!ret) {
OPENSSL_PUT_ERROR(X509V3, X509V3_R_ERROR_IN_EXTENSION);
ERR_add_error_data(4, "name=", name, ", value=", value);
}
return ret;
}
X509_EXTENSION *X509V3_EXT_nconf_nid(const CONF *conf, const X509V3_CTX *ctx,
int ext_nid, const char *value) {
// If omitted, fill in an empty |X509V3_CTX|.
X509V3_CTX ctx_tmp;
if (ctx == NULL) {
X509V3_set_ctx(&ctx_tmp, NULL, NULL, NULL, NULL, 0);
X509V3_set_nconf(&ctx_tmp, conf);
ctx = &ctx_tmp;
}
int crit = v3_check_critical(&value);
int ext_type = v3_check_generic(&value);
if (ext_type != 0) {
return v3_generic_extension(OBJ_nid2sn(ext_nid), value, crit, ext_type,
ctx);
}
return do_ext_nconf(conf, ctx, ext_nid, crit, value);
}
// CONF *conf: Config file
// char *value: Value
static X509_EXTENSION *do_ext_nconf(const CONF *conf, const X509V3_CTX *ctx,
int ext_nid, int crit, const char *value) {
const X509V3_EXT_METHOD *method;
X509_EXTENSION *ext;
const STACK_OF(CONF_VALUE) *nval;
STACK_OF(CONF_VALUE) *nval_owned = NULL;
void *ext_struc;
if (ext_nid == NID_undef) {
OPENSSL_PUT_ERROR(X509V3, X509V3_R_UNKNOWN_EXTENSION_NAME);
return NULL;
}
if (!(method = X509V3_EXT_get_nid(ext_nid))) {
OPENSSL_PUT_ERROR(X509V3, X509V3_R_UNKNOWN_EXTENSION);
return NULL;
}
// Now get internal extension representation based on type
if (method->v2i) {
if (*value == '@') {
// TODO(davidben): This is the only place where |X509V3_EXT_nconf|'s
// |conf| parameter is used. All other codepaths use the copy inside
// |ctx|. Should this be switched and then the parameter ignored?
if (conf == NULL) {
OPENSSL_PUT_ERROR(X509V3, X509V3_R_NO_CONFIG_DATABASE);
return NULL;
}
nval = NCONF_get_section(conf, value + 1);
} else {
nval_owned = X509V3_parse_list(value);
nval = nval_owned;
}
if (nval == NULL || sk_CONF_VALUE_num(nval) <= 0) {
OPENSSL_PUT_ERROR(X509V3, X509V3_R_INVALID_EXTENSION_STRING);
ERR_add_error_data(4, "name=", OBJ_nid2sn(ext_nid), ",section=", value);
sk_CONF_VALUE_pop_free(nval_owned, X509V3_conf_free);
return NULL;
}
ext_struc = method->v2i(method, ctx, nval);
sk_CONF_VALUE_pop_free(nval_owned, X509V3_conf_free);
if (!ext_struc) {
return NULL;
}
} else if (method->s2i) {
if (!(ext_struc = method->s2i(method, ctx, value))) {
return NULL;
}
} else if (method->r2i) {
// TODO(davidben): Should this check be removed? This matches OpenSSL, but
// r2i-based extensions do not necessarily require a config database. The
// two built-in extensions only use it some of the time, and already handle
// |X509V3_get_section| returning NULL.
if (!ctx->db) {
OPENSSL_PUT_ERROR(X509V3, X509V3_R_NO_CONFIG_DATABASE);
return NULL;
}
if (!(ext_struc = method->r2i(method, ctx, value))) {
return NULL;
}
} else {
OPENSSL_PUT_ERROR(X509V3, X509V3_R_EXTENSION_SETTING_NOT_SUPPORTED);
ERR_add_error_data(2, "name=", OBJ_nid2sn(ext_nid));
return NULL;
}
ext = do_ext_i2d(method, ext_nid, crit, ext_struc);
ASN1_item_free(ext_struc, ASN1_ITEM_ptr(method->it));
return ext;
}
static X509_EXTENSION *do_ext_i2d(const X509V3_EXT_METHOD *method, int ext_nid,
int crit, void *ext_struc) {
// Convert the extension's internal representation to DER.
unsigned char *ext_der;
int ext_len;
if (method->it) {
ext_der = NULL;
ext_len = ASN1_item_i2d(ext_struc, &ext_der, ASN1_ITEM_ptr(method->it));
if (ext_len < 0) {
return NULL;
}
} else if (method->ext_nid == NID_id_pkix_OCSP_Nonce && method->i2d != NULL) {
// |NID_id_pkix_OCSP_Nonce| is the only extension using the "old-style"
// ASN.1 callbacks for backwards compatibility reasons.
// Note: See |v3_ext_method| under "include/openssl/x509.h".
ext_len = method->i2d(ext_struc, NULL);
if (!(ext_der = OPENSSL_malloc(ext_len))) {
return NULL;
}
unsigned char *p = ext_der;
method->i2d(ext_struc, &p);
} else {
OPENSSL_PUT_ERROR(X509, X509V3_R_OPERATION_NOT_DEFINED);
return NULL;
}
ASN1_OCTET_STRING *ext_oct = ASN1_OCTET_STRING_new();
if (ext_oct == NULL) {
OPENSSL_free(ext_der);
return NULL;
}
ASN1_STRING_set0(ext_oct, ext_der, ext_len);
X509_EXTENSION *ext =
X509_EXTENSION_create_by_NID(NULL, ext_nid, crit, ext_oct);
ASN1_OCTET_STRING_free(ext_oct);
return ext;
}
// Given an internal structure, nid and critical flag create an extension
X509_EXTENSION *X509V3_EXT_i2d(int ext_nid, int crit, void *ext_struc) {
const X509V3_EXT_METHOD *method;
if (!(method = X509V3_EXT_get_nid(ext_nid))) {
OPENSSL_PUT_ERROR(X509V3, X509V3_R_UNKNOWN_EXTENSION);
return NULL;
}
return do_ext_i2d(method, ext_nid, crit, ext_struc);
}
// Check the extension string for critical flag
static int v3_check_critical(const char **value) {
const char *p = *value;
if ((strlen(p) < 9) || strncmp(p, "critical,", 9)) {
return 0;
}
p += 9;
while (OPENSSL_isspace((unsigned char)*p)) {
p++;
}
*value = p;
return 1;
}
// Check extension string for generic extension and return the type
static int v3_check_generic(const char **value) {
int gen_type = 0;
const char *p = *value;
if ((strlen(p) >= 4) && !strncmp(p, "DER:", 4)) {
p += 4;
gen_type = 1;
} else if ((strlen(p) >= 5) && !strncmp(p, "ASN1:", 5)) {
p += 5;
gen_type = 2;
} else {
return 0;
}
while (OPENSSL_isspace((unsigned char)*p)) {
p++;
}
*value = p;
return gen_type;
}
// Create a generic extension: for now just handle DER type
static X509_EXTENSION *v3_generic_extension(const char *ext, const char *value,
int crit, int gen_type,
const X509V3_CTX *ctx) {
unsigned char *ext_der = NULL;
size_t ext_len = 0;
ASN1_OBJECT *obj = NULL;
ASN1_OCTET_STRING *oct = NULL;
X509_EXTENSION *extension = NULL;
if (!(obj = OBJ_txt2obj(ext, 0))) {
OPENSSL_PUT_ERROR(X509V3, X509V3_R_EXTENSION_NAME_ERROR);
ERR_add_error_data(2, "name=", ext);
goto err;
}
if (gen_type == 1) {
ext_der = x509v3_hex_to_bytes(value, &ext_len);
} else if (gen_type == 2) {
ext_der = generic_asn1(value, ctx, &ext_len);
}
if (ext_der == NULL) {
OPENSSL_PUT_ERROR(X509V3, X509V3_R_EXTENSION_VALUE_ERROR);
ERR_add_error_data(2, "value=", value);
goto err;
}
if (ext_len > INT_MAX) {
OPENSSL_PUT_ERROR(X509V3, ERR_R_OVERFLOW);
goto err;
}
oct = ASN1_OCTET_STRING_new();
if (oct == NULL) {
goto err;
}
ASN1_STRING_set0(oct, ext_der, (int)ext_len);
ext_der = NULL;
extension = X509_EXTENSION_create_by_OBJ(NULL, obj, crit, oct);
err:
ASN1_OBJECT_free(obj);
ASN1_OCTET_STRING_free(oct);
OPENSSL_free(ext_der);
return extension;
}
static unsigned char *generic_asn1(const char *value, const X509V3_CTX *ctx,
size_t *ext_len) {
ASN1_TYPE *typ = ASN1_generate_v3(value, ctx);
if (typ == NULL) {
return NULL;
}
unsigned char *ext_der = NULL;
int len = i2d_ASN1_TYPE(typ, &ext_der);
ASN1_TYPE_free(typ);
if (len < 0) {
return NULL;
}
*ext_len = len;
return ext_der;
}
static void delete_ext(STACK_OF(X509_EXTENSION) *sk, X509_EXTENSION *dext) {
int idx = 0;
ASN1_OBJECT *obj = NULL;
obj = X509_EXTENSION_get_object(dext);
while ((idx = X509v3_get_ext_by_OBJ(sk, obj, -1)) >= 0) {
X509_EXTENSION_free(X509v3_delete_ext(sk, idx));
}
}
// This is the main function: add a bunch of extensions based on a config
// file section to an extension STACK.
int X509V3_EXT_add_nconf_sk(const CONF *conf, const X509V3_CTX *ctx,
const char *section,
STACK_OF(X509_EXTENSION) **sk) {
const STACK_OF(CONF_VALUE) *nval = NCONF_get_section(conf, section);
if (nval == NULL) {
return 0;
}
for (size_t i = 0; i < sk_CONF_VALUE_num(nval); i++) {
const CONF_VALUE *val = sk_CONF_VALUE_value(nval, i);
X509_EXTENSION *ext = X509V3_EXT_nconf(conf, ctx, val->name, val->value);
int ok = 0;
if (ext) {
if (!sk) {
ok = 1;
} else {
if (ctx && ctx->flags == X509V3_CTX_REPLACE) {
delete_ext(*sk, ext);
}
ok = X509v3_add_ext(sk, ext, -1) != NULL;
}
}
X509_EXTENSION_free(ext);
if (!ok) {
return 0;
}
}
return 1;
}
// Convenience functions to add extensions to a certificate, CRL and request
int X509V3_EXT_add_nconf(const CONF *conf, const X509V3_CTX *ctx,
const char *section, X509 *cert) {
STACK_OF(X509_EXTENSION) **sk = NULL;
if (cert) {
sk = &cert->cert_info->extensions;
}
return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);
}
// Same as above but for a CRL
int X509V3_EXT_CRL_add_nconf(const CONF *conf, const X509V3_CTX *ctx,
const char *section, X509_CRL *crl) {
STACK_OF(X509_EXTENSION) **sk = NULL;
if (crl) {
sk = &crl->crl->extensions;
}
return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);
}
// Add extensions to certificate request
int X509V3_EXT_REQ_add_nconf(const CONF *conf, const X509V3_CTX *ctx,
const char *section, X509_REQ *req) {
STACK_OF(X509_EXTENSION) *extlist = NULL, **sk = NULL;
int i;
if (req) {
sk = &extlist;
}
i = X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);
if (!i || !sk) {
return i;
}
i = X509_REQ_add_extensions(req, extlist);
sk_X509_EXTENSION_pop_free(extlist, X509_EXTENSION_free);
return i;
}
// Config database functions
const STACK_OF(CONF_VALUE) *X509V3_get_section(const X509V3_CTX *ctx,
const char *section) {
if (ctx->db == NULL) {
OPENSSL_PUT_ERROR(X509V3, X509V3_R_OPERATION_NOT_DEFINED);
return NULL;
}
return NCONF_get_section(ctx->db, section);
}
void X509V3_set_nconf(X509V3_CTX *ctx, const CONF *conf) { ctx->db = conf; }
void X509V3_set_ctx(X509V3_CTX *ctx, const X509 *issuer, const X509 *subj,
const X509_REQ *req, const X509_CRL *crl, int flags) {
OPENSSL_memset(ctx, 0, sizeof(*ctx));
ctx->issuer_cert = issuer;
ctx->subject_cert = subj;
ctx->crl = crl;
ctx->subject_req = req;
ctx->flags = flags;
}
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