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apache/modules/ssl/ssl_util_ssl.c
Roy T. Fielding de659cbed0 update license header text 
git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@420983 13f79535-47bb-0310-9956-ffa450edef68
2006-07-11 20:33:53 +00:00

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/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* _ _
* _ __ ___ ___ __| | ___ ___| | mod_ssl
* | '_ ` _ \ / _ \ / _` | / __/ __| | Apache Interface to OpenSSL
* | | | | | | (_) | (_| | \__ \__ \ |
* |_| |_| |_|\___/ \__,_|___|___/___/_|
* |_____|
* ssl_util_ssl.c
* Additional Utility Functions for OpenSSL
*/
#include "ssl_private.h"
/* _________________________________________________________________
**
** Additional High-Level Functions for OpenSSL
** _________________________________________________________________
*/
/* we initialize this index at startup time
* and never write to it at request time,
* so this static is thread safe.
* also note that OpenSSL increments at static variable when
* SSL_get_ex_new_index() is called, so we _must_ do this at startup.
*/
static int SSL_app_data2_idx = -1;
void SSL_init_app_data2_idx(void)
{
int i;
if (SSL_app_data2_idx > -1) {
return;
}
/* we _do_ need to call this twice */
for (i=0; i<=1; i++) {
SSL_app_data2_idx =
SSL_get_ex_new_index(0,
"Second Application Data for SSL",
NULL, NULL, NULL);
}
}
void *SSL_get_app_data2(SSL *ssl)
{
return (void *)SSL_get_ex_data(ssl, SSL_app_data2_idx);
}
void SSL_set_app_data2(SSL *ssl, void *arg)
{
SSL_set_ex_data(ssl, SSL_app_data2_idx, (char *)arg);
return;
}
/* _________________________________________________________________
**
** High-Level Certificate / Private Key Loading
** _________________________________________________________________
*/
X509 *SSL_read_X509(char* filename, X509 **x509, modssl_read_bio_cb_fn *cb)
{
X509 *rc;
BIO *bioS;
BIO *bioF;
/* 1. try PEM (= DER+Base64+headers) */
if ((bioS=BIO_new_file(filename, "r")) == NULL)
return NULL;
rc = modssl_PEM_read_bio_X509 (bioS, x509, cb, NULL);
BIO_free(bioS);
if (rc == NULL) {
/* 2. try DER+Base64 */
if ((bioS=BIO_new_file(filename, "r")) == NULL)
return NULL;
if ((bioF = BIO_new(BIO_f_base64())) == NULL) {
BIO_free(bioS);
return NULL;
}
bioS = BIO_push(bioF, bioS);
rc = d2i_X509_bio(bioS, NULL);
BIO_free_all(bioS);
if (rc == NULL) {
/* 3. try plain DER */
if ((bioS=BIO_new_file(filename, "r")) == NULL)
return NULL;
rc = d2i_X509_bio(bioS, NULL);
BIO_free(bioS);
}
}
if (rc != NULL && x509 != NULL) {
if (*x509 != NULL)
X509_free(*x509);
*x509 = rc;
}
return rc;
}
#if SSL_LIBRARY_VERSION <= 0x00904100
static EVP_PKEY *d2i_PrivateKey_bio(BIO *bio, EVP_PKEY **key)
{
return ((EVP_PKEY *)ASN1_d2i_bio(
(char *(*)())EVP_PKEY_new,
(char *(*)())d2i_PrivateKey,
(bio), (unsigned char **)(key)));
}
#endif
EVP_PKEY *SSL_read_PrivateKey(char* filename, EVP_PKEY **key, modssl_read_bio_cb_fn *cb, void *s)
{
EVP_PKEY *rc;
BIO *bioS;
BIO *bioF;
/* 1. try PEM (= DER+Base64+headers) */
if ((bioS=BIO_new_file(filename, "r")) == NULL)
return NULL;
rc = modssl_PEM_read_bio_PrivateKey(bioS, key, cb, s);
BIO_free(bioS);
if (rc == NULL) {
/* 2. try DER+Base64 */
if ((bioS = BIO_new_file(filename, "r")) == NULL)
return NULL;
if ((bioF = BIO_new(BIO_f_base64())) == NULL) {
BIO_free(bioS);
return NULL;
}
bioS = BIO_push(bioF, bioS);
rc = d2i_PrivateKey_bio(bioS, NULL);
BIO_free_all(bioS);
if (rc == NULL) {
/* 3. try plain DER */
if ((bioS = BIO_new_file(filename, "r")) == NULL)
return NULL;
rc = d2i_PrivateKey_bio(bioS, NULL);
BIO_free(bioS);
}
}
if (rc != NULL && key != NULL) {
if (*key != NULL)
EVP_PKEY_free(*key);
*key = rc;
}
return rc;
}
/* _________________________________________________________________
**
** Smart shutdown
** _________________________________________________________________
*/
int SSL_smart_shutdown(SSL *ssl)
{
int i;
int rc;
/*
* Repeat the calls, because SSL_shutdown internally dispatches through a
* little state machine. Usually only one or two interation should be
* needed, so we restrict the total number of restrictions in order to
* avoid process hangs in case the client played bad with the socket
* connection and OpenSSL cannot recognize it.
*/
rc = 0;
for (i = 0; i < 4 /* max 2x pending + 2x data = 4 */; i++) {
if ((rc = SSL_shutdown(ssl)))
break;
}
return rc;
}
/* _________________________________________________________________
**
** Certificate Revocation List (CRL) Storage
** _________________________________________________________________
*/
X509_STORE *SSL_X509_STORE_create(char *cpFile, char *cpPath)
{
X509_STORE *pStore;
X509_LOOKUP *pLookup;
int rv = 1;
ERR_clear_error();
if (cpFile == NULL && cpPath == NULL)
return NULL;
if ((pStore = X509_STORE_new()) == NULL)
return NULL;
if (cpFile != NULL) {
pLookup = X509_STORE_add_lookup(pStore, X509_LOOKUP_file());
if (pLookup == NULL) {
X509_STORE_free(pStore);
return NULL;
}
rv = X509_LOOKUP_load_file(pLookup, cpFile, X509_FILETYPE_PEM);
}
if (cpPath != NULL && rv == 1) {
pLookup = X509_STORE_add_lookup(pStore, X509_LOOKUP_hash_dir());
if (pLookup == NULL) {
X509_STORE_free(pStore);
return NULL;
}
rv = X509_LOOKUP_add_dir(pLookup, cpPath, X509_FILETYPE_PEM);
}
return rv == 1 ? pStore : NULL;
}
int SSL_X509_STORE_lookup(X509_STORE *pStore, int nType,
X509_NAME *pName, X509_OBJECT *pObj)
{
X509_STORE_CTX pStoreCtx;
int rc;
X509_STORE_CTX_init(&pStoreCtx, pStore, NULL, NULL);
rc = X509_STORE_get_by_subject(&pStoreCtx, nType, pName, pObj);
X509_STORE_CTX_cleanup(&pStoreCtx);
return rc;
}
/* _________________________________________________________________
**
** Cipher Suite Spec String Creation
** _________________________________________________________________
*/
char *SSL_make_ciphersuite(apr_pool_t *p, SSL *ssl)
{
STACK_OF(SSL_CIPHER) *sk;
SSL_CIPHER *c;
int i;
int l;
char *cpCipherSuite;
char *cp;
if (ssl == NULL)
return "";
if ((sk = (STACK_OF(SSL_CIPHER) *)SSL_get_ciphers(ssl)) == NULL)
return "";
l = 0;
for (i = 0; i < sk_SSL_CIPHER_num(sk); i++) {
c = sk_SSL_CIPHER_value(sk, i);
l += strlen(SSL_CIPHER_get_name(c))+2+1;
}
if (l == 0)
return "";
cpCipherSuite = (char *)apr_palloc(p, l+1);
cp = cpCipherSuite;
for (i = 0; i < sk_SSL_CIPHER_num(sk); i++) {
c = sk_SSL_CIPHER_value(sk, i);
l = strlen(SSL_CIPHER_get_name(c));
memcpy(cp, SSL_CIPHER_get_name(c), l);
cp += l;
*cp++ = '/';
*cp++ = (SSL_CIPHER_get_valid(c) == 1 ? '1' : '0');
*cp++ = ':';
}
*(cp-1) = NUL;
return cpCipherSuite;
}
/* _________________________________________________________________
**
** Certificate Checks
** _________________________________________________________________
*/
/* check whether cert contains extended key usage with a SGC tag */
BOOL SSL_X509_isSGC(X509 *cert)
{
#ifdef HAVE_SSL_X509V3_EXT_d2i
X509_EXTENSION *ext;
int ext_nid;
STACK *sk;
BOOL is_sgc;
int idx;
int i;
is_sgc = FALSE;
idx = X509_get_ext_by_NID(cert, NID_ext_key_usage, -1);
if (idx >= 0) {
ext = X509_get_ext(cert, idx);
if ((sk = (STACK *)X509V3_EXT_d2i(ext)) != NULL) {
for (i = 0; i < sk_num(sk); i++) {
ext_nid = OBJ_obj2nid((ASN1_OBJECT *)sk_value(sk, i));
if (ext_nid == NID_ms_sgc || ext_nid == NID_ns_sgc) {
is_sgc = TRUE;
break;
}
}
}
}
return is_sgc;
#else
return FALSE;
#endif
}
/* retrieve basic constraints ingredients */
BOOL SSL_X509_getBC(X509 *cert, int *ca, int *pathlen)
{
#ifdef HAVE_SSL_X509V3_EXT_d2i
X509_EXTENSION *ext;
BASIC_CONSTRAINTS *bc;
int idx;
BIGNUM *bn = NULL;
char *cp;
if ((idx = X509_get_ext_by_NID(cert, NID_basic_constraints, -1)) < 0)
return FALSE;
ext = X509_get_ext(cert, idx);
if (ext == NULL)
return FALSE;
if ((bc = (BASIC_CONSTRAINTS *)X509V3_EXT_d2i(ext)) == NULL)
return FALSE;
*ca = bc->ca;
*pathlen = -1 /* unlimited */;
if (bc->pathlen != NULL) {
if ((bn = ASN1_INTEGER_to_BN(bc->pathlen, NULL)) == NULL)
return FALSE;
if ((cp = BN_bn2dec(bn)) == NULL)
return FALSE;
*pathlen = atoi(cp);
free(cp);
BN_free(bn);
}
BASIC_CONSTRAINTS_free(bc);
return TRUE;
#else
return FALSE;
#endif
}
/* retrieve subject CommonName of certificate */
BOOL SSL_X509_getCN(apr_pool_t *p, X509 *xs, char **cppCN)
{
X509_NAME *xsn;
X509_NAME_ENTRY *xsne;
int i, nid;
unsigned char *data_ptr;
int data_len;
xsn = X509_get_subject_name(xs);
for (i = 0; i < sk_X509_NAME_ENTRY_num((STACK_OF(X509_NAME_ENTRY) *)
X509_NAME_get_entries(xsn)); i++) {
xsne = sk_X509_NAME_ENTRY_value((STACK_OF(X509_NAME_ENTRY) *)
X509_NAME_get_entries(xsn), i);
nid = OBJ_obj2nid((ASN1_OBJECT *)X509_NAME_ENTRY_get_object(xsne));
if (nid == NID_commonName) {
data_ptr = X509_NAME_ENTRY_get_data_ptr(xsne);
data_len = X509_NAME_ENTRY_get_data_len(xsne);
*cppCN = apr_palloc(p, data_len+1);
apr_cpystrn(*cppCN, (char *)data_ptr, data_len+1);
(*cppCN)[data_len] = NUL;
ap_xlate_proto_from_ascii(*cppCN, data_len);
return TRUE;
}
}
return FALSE;
}
/* _________________________________________________________________
**
** Low-Level CA Certificate Loading
** _________________________________________________________________
*/
BOOL SSL_X509_INFO_load_file(apr_pool_t *ptemp,
STACK_OF(X509_INFO) *sk,
const char *filename)
{
BIO *in;
if (!(in = BIO_new(BIO_s_file()))) {
return FALSE;
}
if (BIO_read_filename(in, MODSSL_PCHAR_CAST filename) <= 0) {
BIO_free(in);
return FALSE;
}
ERR_clear_error();
modssl_PEM_X509_INFO_read_bio(in, sk, NULL, NULL);
BIO_free(in);
return TRUE;
}
BOOL SSL_X509_INFO_load_path(apr_pool_t *ptemp,
STACK_OF(X509_INFO) *sk,
const char *pathname)
{
/* XXX: this dir read code is exactly the same as that in
* ssl_engine_init.c, only the call to handle the fullname is different,
* should fold the duplication.
*/
apr_dir_t *dir;
apr_finfo_t dirent;
apr_int32_t finfo_flags = APR_FINFO_TYPE|APR_FINFO_NAME;
const char *fullname;
BOOL ok = FALSE;
if (apr_dir_open(&dir, pathname, ptemp) != APR_SUCCESS) {
return FALSE;
}
while ((apr_dir_read(&dirent, finfo_flags, dir)) == APR_SUCCESS) {
if (dirent.filetype == APR_DIR) {
continue; /* don't try to load directories */
}
fullname = apr_pstrcat(ptemp,
pathname, "/", dirent.name,
NULL);
if (SSL_X509_INFO_load_file(ptemp, sk, fullname)) {
ok = TRUE;
}
}
apr_dir_close(dir);
return ok;
}
/* _________________________________________________________________
**
** Extra Server Certificate Chain Support
** _________________________________________________________________
*/
/*
* Read a file that optionally contains the server certificate in PEM
* format, possibly followed by a sequence of CA certificates that
* should be sent to the peer in the SSL Certificate message.
*/
int SSL_CTX_use_certificate_chain(
SSL_CTX *ctx, char *file, int skipfirst, modssl_read_bio_cb_fn *cb)
{
BIO *bio;
X509 *x509;
unsigned long err;
int n;
STACK *extra_certs;
if ((bio = BIO_new(BIO_s_file_internal())) == NULL)
return -1;
if (BIO_read_filename(bio, file) <= 0) {
BIO_free(bio);
return -1;
}
/* optionally skip a leading server certificate */
if (skipfirst) {
if ((x509 = modssl_PEM_read_bio_X509(bio, NULL, cb, NULL)) == NULL) {
BIO_free(bio);
return -1;
}
X509_free(x509);
}
/* free a perhaps already configured extra chain */
extra_certs=SSL_CTX_get_extra_certs(ctx);
if (extra_certs != NULL) {
sk_X509_pop_free((STACK_OF(X509) *)extra_certs, X509_free);
SSL_CTX_set_extra_certs(ctx,NULL);
}
/* create new extra chain by loading the certs */
n = 0;
while ((x509 = modssl_PEM_read_bio_X509(bio, NULL, cb, NULL)) != NULL) {
if (!SSL_CTX_add_extra_chain_cert(ctx, x509)) {
X509_free(x509);
BIO_free(bio);
return -1;
}
n++;
}
/* Make sure that only the error is just an EOF */
if ((err = ERR_peek_error()) > 0) {
if (!( ERR_GET_LIB(err) == ERR_LIB_PEM
&& ERR_GET_REASON(err) == PEM_R_NO_START_LINE)) {
BIO_free(bio);
return -1;
}
while (ERR_get_error() > 0) ;
}
BIO_free(bio);
return n;
}
/* _________________________________________________________________
**
** Session Stuff
** _________________________________________________________________
*/
char *SSL_SESSION_id2sz(unsigned char *id, int idlen,
char *str, int strsize)
{
char *cp;
int n;
cp = str;
for (n = 0; n < idlen && n < SSL_MAX_SSL_SESSION_ID_LENGTH; n++) {
apr_snprintf(cp, strsize - (cp-str), "%02X", id[n]);
cp += 2;
}
*cp = NUL;
return str;
}
/* sslc+OpenSSL compat */
int modssl_session_get_time(SSL_SESSION *session)
{
#ifdef OPENSSL_VERSION_NUMBER
return SSL_SESSION_get_time(session);
#else /* assume sslc */
CRYPTO_TIME_T ct;
SSL_SESSION_get_time(session, &ct);
return CRYPTO_time_to_int(&ct);
#endif
}
#ifndef SSLC_VERSION_NUMBER
#define SSLC_VERSION_NUMBER 0x0000
#endif
DH *modssl_dh_configure(unsigned char *p, int plen,
unsigned char *g, int glen)
{
DH *dh;
if (!(dh = DH_new())) {
return NULL;
}
#if defined(OPENSSL_VERSION_NUMBER) || (SSLC_VERSION_NUMBER < 0x2000)
dh->p = BN_bin2bn(p, plen, NULL);
dh->g = BN_bin2bn(g, glen, NULL);
if (!(dh->p && dh->g)) {
DH_free(dh);
return NULL;
}
#else
R_EITEMS_add(dh->data, PK_TYPE_DH, PK_DH_P, 0, p, plen, R_EITEMS_PF_COPY);
R_EITEMS_add(dh->data, PK_TYPE_DH, PK_DH_G, 0, g, glen, R_EITEMS_PF_COPY);
#endif
return dh;
}
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