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apache/modules/ssl/ssl_engine_vars.c
Joe Orton ea188b0032 * modules/ssl/ssl_engine_vars.c (ssl_var_lookup_ssl_version): constify 
where possible.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@520839 13f79535-47bb-0310-9956-ffa450edef68
2007-03-21 11:08:14 +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_engine_vars.c
* Variable Lookup Facility
*/
/* ``Those of you who think they
know everything are very annoying
to those of us who do.''
-- Unknown */
#include "ssl_private.h"
#include "mod_ssl.h"
#include "apr_time.h"
/* _________________________________________________________________
**
** Variable Lookup
** _________________________________________________________________
*/
static char *ssl_var_lookup_ssl(apr_pool_t *p, conn_rec *c, char *var);
static char *ssl_var_lookup_ssl_cert(apr_pool_t *p, X509 *xs, char *var);
static char *ssl_var_lookup_ssl_cert_dn(apr_pool_t *p, X509_NAME *xsname, char *var);
static char *ssl_var_lookup_ssl_cert_valid(apr_pool_t *p, ASN1_UTCTIME *tm);
static char *ssl_var_lookup_ssl_cert_remain(apr_pool_t *p, ASN1_UTCTIME *tm);
static char *ssl_var_lookup_ssl_cert_serial(apr_pool_t *p, X509 *xs);
static char *ssl_var_lookup_ssl_cert_chain(apr_pool_t *p, STACK_OF(X509) *sk, char *var);
static char *ssl_var_lookup_ssl_cert_PEM(apr_pool_t *p, X509 *xs);
static char *ssl_var_lookup_ssl_cert_verify(apr_pool_t *p, conn_rec *c);
static char *ssl_var_lookup_ssl_cipher(apr_pool_t *p, conn_rec *c, char *var);
static void ssl_var_lookup_ssl_cipher_bits(SSL *ssl, int *usekeysize, int *algkeysize);
static char *ssl_var_lookup_ssl_version(apr_pool_t *p, char *var);
static char *ssl_var_lookup_ssl_compress_meth(SSL *ssl);
static int ssl_is_https(conn_rec *c)
{
SSLConnRec *sslconn = myConnConfig(c);
return sslconn && sslconn->ssl;
}
void ssl_var_register(void)
{
APR_REGISTER_OPTIONAL_FN(ssl_is_https);
APR_REGISTER_OPTIONAL_FN(ssl_var_lookup);
APR_REGISTER_OPTIONAL_FN(ssl_ext_list);
return;
}
/* This function must remain safe to use for a non-SSL connection. */
char *ssl_var_lookup(apr_pool_t *p, server_rec *s, conn_rec *c, request_rec *r, char *var)
{
SSLModConfigRec *mc = myModConfig(s);
const char *result;
BOOL resdup;
apr_time_exp_t tm;
result = NULL;
resdup = TRUE;
/*
* When no pool is given try to find one
*/
if (p == NULL) {
if (r != NULL)
p = r->pool;
else if (c != NULL)
p = c->pool;
else
p = mc->pPool;
}
/*
* Request dependent stuff
*/
if (r != NULL) {
switch (var[0]) {
case 'H':
case 'h':
if (strcEQ(var, "HTTP_USER_AGENT"))
result = apr_table_get(r->headers_in, "User-Agent");
else if (strcEQ(var, "HTTP_REFERER"))
result = apr_table_get(r->headers_in, "Referer");
else if (strcEQ(var, "HTTP_COOKIE"))
result = apr_table_get(r->headers_in, "Cookie");
else if (strcEQ(var, "HTTP_FORWARDED"))
result = apr_table_get(r->headers_in, "Forwarded");
else if (strcEQ(var, "HTTP_HOST"))
result = apr_table_get(r->headers_in, "Host");
else if (strcEQ(var, "HTTP_PROXY_CONNECTION"))
result = apr_table_get(r->headers_in, "Proxy-Connection");
else if (strcEQ(var, "HTTP_ACCEPT"))
result = apr_table_get(r->headers_in, "Accept");
else if (strlen(var) > 5 && strcEQn(var, "HTTP:", 5))
/* all other headers from which we are still not know about */
result = apr_table_get(r->headers_in, var+5);
break;
case 'R':
case 'r':
if (strcEQ(var, "REQUEST_METHOD"))
result = r->method;
else if (strcEQ(var, "REQUEST_SCHEME"))
result = ap_http_scheme(r);
else if (strcEQ(var, "REQUEST_URI"))
result = r->uri;
else if (strcEQ(var, "REQUEST_FILENAME"))
result = r->filename;
else if (strcEQ(var, "REMOTE_HOST"))
result = ap_get_remote_host(r->connection, r->per_dir_config,
REMOTE_NAME, NULL);
else if (strcEQ(var, "REMOTE_IDENT"))
result = ap_get_remote_logname(r);
else if (strcEQ(var, "REMOTE_USER"))
result = r->user;
break;
case 'S':
case 's':
if (strcEQn(var, "SSL", 3)) break; /* shortcut common case */
if (strcEQ(var, "SERVER_ADMIN"))
result = r->server->server_admin;
else if (strcEQ(var, "SERVER_NAME"))
result = ap_get_server_name(r);
else if (strcEQ(var, "SERVER_PORT"))
result = apr_psprintf(p, "%u", ap_get_server_port(r));
else if (strcEQ(var, "SERVER_PROTOCOL"))
result = r->protocol;
else if (strcEQ(var, "SCRIPT_FILENAME"))
result = r->filename;
break;
default:
if (strcEQ(var, "PATH_INFO"))
result = r->path_info;
else if (strcEQ(var, "QUERY_STRING"))
result = r->args;
else if (strcEQ(var, "IS_SUBREQ"))
result = (r->main != NULL ? "true" : "false");
else if (strcEQ(var, "DOCUMENT_ROOT"))
result = ap_document_root(r);
else if (strcEQ(var, "AUTH_TYPE"))
result = r->ap_auth_type;
else if (strcEQ(var, "THE_REQUEST"))
result = r->the_request;
break;
}
}
/*
* Connection stuff
*/
if (result == NULL && c != NULL) {
SSLConnRec *sslconn = myConnConfig(c);
if (strlen(var) > 4 && strcEQn(var, "SSL_", 4)
&& sslconn && sslconn->ssl)
result = ssl_var_lookup_ssl(p, c, var+4);
else if (strcEQ(var, "REMOTE_ADDR"))
result = c->remote_ip;
else if (strcEQ(var, "HTTPS")) {
if (sslconn && sslconn->ssl)
result = "on";
else
result = "off";
}
}
/*
* Totally independent stuff
*/
if (result == NULL) {
if (strlen(var) > 12 && strcEQn(var, "SSL_VERSION_", 12))
result = ssl_var_lookup_ssl_version(p, var+12);
else if (strcEQ(var, "SERVER_SOFTWARE"))
result = ap_get_server_banner();
else if (strcEQ(var, "API_VERSION")) {
result = apr_itoa(p, MODULE_MAGIC_NUMBER);
resdup = FALSE;
}
else if (strcEQ(var, "TIME_YEAR")) {
apr_time_exp_lt(&tm, apr_time_now());
result = apr_psprintf(p, "%02d%02d",
(tm.tm_year / 100) + 19, tm.tm_year % 100);
resdup = FALSE;
}
#define MKTIMESTR(format, tmfield) \
apr_time_exp_lt(&tm, apr_time_now()); \
result = apr_psprintf(p, format, tm.tmfield); \
resdup = FALSE;
else if (strcEQ(var, "TIME_MON")) {
MKTIMESTR("%02d", tm_mon+1)
}
else if (strcEQ(var, "TIME_DAY")) {
MKTIMESTR("%02d", tm_mday)
}
else if (strcEQ(var, "TIME_HOUR")) {
MKTIMESTR("%02d", tm_hour)
}
else if (strcEQ(var, "TIME_MIN")) {
MKTIMESTR("%02d", tm_min)
}
else if (strcEQ(var, "TIME_SEC")) {
MKTIMESTR("%02d", tm_sec)
}
else if (strcEQ(var, "TIME_WDAY")) {
MKTIMESTR("%d", tm_wday)
}
else if (strcEQ(var, "TIME")) {
apr_time_exp_lt(&tm, apr_time_now());
result = apr_psprintf(p,
"%02d%02d%02d%02d%02d%02d%02d", (tm.tm_year / 100) + 19,
(tm.tm_year % 100), tm.tm_mon+1, tm.tm_mday,
tm.tm_hour, tm.tm_min, tm.tm_sec);
resdup = FALSE;
}
/* all other env-variables from the parent Apache process */
else if (strlen(var) > 4 && strcEQn(var, "ENV:", 4)) {
result = apr_table_get(r->notes, var+4);
if (result == NULL)
result = apr_table_get(r->subprocess_env, var+4);
if (result == NULL)
result = getenv(var+4);
}
}
if (result != NULL && resdup)
result = apr_pstrdup(p, result);
if (result == NULL)
result = "";
return (char *)result;
}
static char *ssl_var_lookup_ssl(apr_pool_t *p, conn_rec *c, char *var)
{
SSLConnRec *sslconn = myConnConfig(c);
char *result;
X509 *xs;
STACK_OF(X509) *sk;
SSL *ssl;
result = NULL;
ssl = sslconn->ssl;
if (strlen(var) > 8 && strcEQn(var, "VERSION_", 8)) {
result = ssl_var_lookup_ssl_version(p, var+8);
}
else if (ssl != NULL && strcEQ(var, "PROTOCOL")) {
result = (char *)SSL_get_version(ssl);
}
else if (ssl != NULL && strcEQ(var, "SESSION_ID")) {
char buf[SSL_SESSION_ID_STRING_LEN];
SSL_SESSION *pSession = SSL_get_session(ssl);
if (pSession) {
result = apr_pstrdup(p, SSL_SESSION_id2sz(
SSL_SESSION_get_session_id(pSession),
SSL_SESSION_get_session_id_length(pSession),
buf, sizeof(buf)));
}
}
else if (ssl != NULL && strlen(var) >= 6 && strcEQn(var, "CIPHER", 6)) {
result = ssl_var_lookup_ssl_cipher(p, c, var+6);
}
else if (ssl != NULL && strlen(var) > 18 && strcEQn(var, "CLIENT_CERT_CHAIN_", 18)) {
sk = SSL_get_peer_cert_chain(ssl);
result = ssl_var_lookup_ssl_cert_chain(p, sk, var+18);
}
else if (ssl != NULL && strcEQ(var, "CLIENT_VERIFY")) {
result = ssl_var_lookup_ssl_cert_verify(p, c);
}
else if (ssl != NULL && strlen(var) > 7 && strcEQn(var, "CLIENT_", 7)) {
if ((xs = SSL_get_peer_certificate(ssl)) != NULL) {
result = ssl_var_lookup_ssl_cert(p, xs, var+7);
X509_free(xs);
}
}
else if (ssl != NULL && strlen(var) > 7 && strcEQn(var, "SERVER_", 7)) {
if ((xs = SSL_get_certificate(ssl)) != NULL)
result = ssl_var_lookup_ssl_cert(p, xs, var+7);
}
else if (ssl != NULL && strcEQ(var, "COMPRESS_METHOD")) {
result = ssl_var_lookup_ssl_compress_meth(ssl);
}
return result;
}
static char *ssl_var_lookup_ssl_cert(apr_pool_t *p, X509 *xs, char *var)
{
char *result;
BOOL resdup;
X509_NAME *xsname;
int nid;
char *cp;
result = NULL;
resdup = TRUE;
if (strcEQ(var, "M_VERSION")) {
result = apr_psprintf(p, "%lu", X509_get_version(xs)+1);
resdup = FALSE;
}
else if (strcEQ(var, "M_SERIAL")) {
result = ssl_var_lookup_ssl_cert_serial(p, xs);
}
else if (strcEQ(var, "V_START")) {
result = ssl_var_lookup_ssl_cert_valid(p, X509_get_notBefore(xs));
}
else if (strcEQ(var, "V_END")) {
result = ssl_var_lookup_ssl_cert_valid(p, X509_get_notAfter(xs));
}
else if (strcEQ(var, "V_REMAIN")) {
result = ssl_var_lookup_ssl_cert_remain(p, X509_get_notAfter(xs));
resdup = FALSE;
}
else if (strcEQ(var, "S_DN")) {
xsname = X509_get_subject_name(xs);
cp = X509_NAME_oneline(xsname, NULL, 0);
result = apr_pstrdup(p, cp);
modssl_free(cp);
resdup = FALSE;
}
else if (strlen(var) > 5 && strcEQn(var, "S_DN_", 5)) {
xsname = X509_get_subject_name(xs);
result = ssl_var_lookup_ssl_cert_dn(p, xsname, var+5);
resdup = FALSE;
}
else if (strcEQ(var, "I_DN")) {
xsname = X509_get_issuer_name(xs);
cp = X509_NAME_oneline(xsname, NULL, 0);
result = apr_pstrdup(p, cp);
modssl_free(cp);
resdup = FALSE;
}
else if (strlen(var) > 5 && strcEQn(var, "I_DN_", 5)) {
xsname = X509_get_issuer_name(xs);
result = ssl_var_lookup_ssl_cert_dn(p, xsname, var+5);
resdup = FALSE;
}
else if (strcEQ(var, "A_SIG")) {
nid = OBJ_obj2nid((ASN1_OBJECT *)X509_get_signature_algorithm(xs));
result = apr_pstrdup(p,
(nid == NID_undef) ? "UNKNOWN" : OBJ_nid2ln(nid));
resdup = FALSE;
}
else if (strcEQ(var, "A_KEY")) {
nid = OBJ_obj2nid((ASN1_OBJECT *)X509_get_key_algorithm(xs));
result = apr_pstrdup(p,
(nid == NID_undef) ? "UNKNOWN" : OBJ_nid2ln(nid));
resdup = FALSE;
}
else if (strcEQ(var, "CERT")) {
result = ssl_var_lookup_ssl_cert_PEM(p, xs);
}
if (result != NULL && resdup)
result = apr_pstrdup(p, result);
return result;
}
static const struct {
char *name;
int nid;
} ssl_var_lookup_ssl_cert_dn_rec[] = {
{ "C", NID_countryName },
{ "ST", NID_stateOrProvinceName }, /* officially (RFC2156) */
{ "SP", NID_stateOrProvinceName }, /* compatibility (SSLeay) */
{ "L", NID_localityName },
{ "O", NID_organizationName },
{ "OU", NID_organizationalUnitName },
{ "CN", NID_commonName },
{ "T", NID_title },
{ "I", NID_initials },
{ "G", NID_givenName },
{ "S", NID_surname },
{ "D", NID_description },
#ifdef NID_x500UniqueIdentifier /* new name as of Openssl 0.9.7 */
{ "UID", NID_x500UniqueIdentifier },
#else /* old name, OpenSSL < 0.9.7 */
{ "UID", NID_uniqueIdentifier },
#endif
{ "Email", NID_pkcs9_emailAddress },
{ NULL, 0 }
};
static char *ssl_var_lookup_ssl_cert_dn(apr_pool_t *p, X509_NAME *xsname, char *var)
{
char *result, *ptr;
X509_NAME_ENTRY *xsne;
int i, j, n, idx = 0;
apr_size_t varlen;
/* if an _N suffix is used, find the Nth attribute of given name */
ptr = strchr(var, '_');
if (ptr != NULL && strspn(ptr + 1, "0123456789") == strlen(ptr + 1)) {
idx = atoi(ptr + 1);
varlen = ptr - var;
} else {
varlen = strlen(var);
}
result = NULL;
for (i = 0; ssl_var_lookup_ssl_cert_dn_rec[i].name != NULL; i++) {
if (strEQn(var, ssl_var_lookup_ssl_cert_dn_rec[i].name, varlen)
&& strlen(ssl_var_lookup_ssl_cert_dn_rec[i].name) == varlen) {
for (j = 0; j < sk_X509_NAME_ENTRY_num((STACK_OF(X509_NAME_ENTRY) *)
X509_NAME_get_entries(xsname));
j++) {
xsne = sk_X509_NAME_ENTRY_value((STACK_OF(X509_NAME_ENTRY) *)
X509_NAME_get_entries(xsname), j);
n =OBJ_obj2nid((ASN1_OBJECT *)X509_NAME_ENTRY_get_object(xsne));
if (n == ssl_var_lookup_ssl_cert_dn_rec[i].nid && idx-- == 0) {
unsigned char *data = X509_NAME_ENTRY_get_data_ptr(xsne);
/* cast needed from unsigned char to char */
result = apr_pstrmemdup(p, (char *)data,
X509_NAME_ENTRY_get_data_len(xsne));
#if APR_CHARSET_EBCDIC
ap_xlate_proto_from_ascii(result, X509_NAME_ENTRY_get_data_len(xsne));
#endif /* APR_CHARSET_EBCDIC */
break;
}
}
break;
}
}
return result;
}
static char *ssl_var_lookup_ssl_cert_valid(apr_pool_t *p, ASN1_UTCTIME *tm)
{
char *result;
BIO* bio;
int n;
if ((bio = BIO_new(BIO_s_mem())) == NULL)
return NULL;
ASN1_UTCTIME_print(bio, tm);
n = BIO_pending(bio);
result = apr_pcalloc(p, n+1);
n = BIO_read(bio, result, n);
result[n] = NUL;
BIO_free(bio);
return result;
}
#define DIGIT2NUM(x) (((x)[0] - '0') * 10 + (x)[1] - '0')
/* Return a string giving the number of days remaining until 'tm', or
* "0" if this can't be determined. */
static char *ssl_var_lookup_ssl_cert_remain(apr_pool_t *p, ASN1_UTCTIME *tm)
{
apr_time_t then, now = apr_time_now();
apr_time_exp_t exp = {0};
long diff;
/* Fail if the time isn't a valid ASN.1 UTCTIME; RFC3280 mandates
* that the seconds digits are present even though ASN.1
* doesn't. */
if (tm->length < 11 || !ASN1_UTCTIME_check(tm)) {
return apr_pstrdup(p, "0");
}
exp.tm_year = DIGIT2NUM(tm->data);
exp.tm_mon = DIGIT2NUM(tm->data + 2) - 1;
exp.tm_mday = DIGIT2NUM(tm->data + 4) + 1;
exp.tm_hour = DIGIT2NUM(tm->data + 6);
exp.tm_min = DIGIT2NUM(tm->data + 8);
exp.tm_sec = DIGIT2NUM(tm->data + 10);
if (exp.tm_year <= 50) exp.tm_year += 100;
if (apr_time_exp_gmt_get(&then, &exp) != APR_SUCCESS) {
return apr_pstrdup(p, "0");
}
diff = (long)((apr_time_sec(then) - apr_time_sec(now)) / (60*60*24));
return diff > 0 ? apr_ltoa(p, diff) : apr_pstrdup(p, "0");
}
static char *ssl_var_lookup_ssl_cert_serial(apr_pool_t *p, X509 *xs)
{
char *result;
BIO *bio;
int n;
if ((bio = BIO_new(BIO_s_mem())) == NULL)
return NULL;
i2a_ASN1_INTEGER(bio, X509_get_serialNumber(xs));
n = BIO_pending(bio);
result = apr_pcalloc(p, n+1);
n = BIO_read(bio, result, n);
result[n] = NUL;
BIO_free(bio);
return result;
}
static char *ssl_var_lookup_ssl_cert_chain(apr_pool_t *p, STACK_OF(X509) *sk, char *var)
{
char *result;
X509 *xs;
int n;
result = NULL;
if (strspn(var, "0123456789") == strlen(var)) {
n = atoi(var);
if (n < sk_X509_num(sk)) {
xs = sk_X509_value(sk, n);
result = ssl_var_lookup_ssl_cert_PEM(p, xs);
}
}
return result;
}
static char *ssl_var_lookup_ssl_cert_PEM(apr_pool_t *p, X509 *xs)
{
char *result;
BIO *bio;
int n;
if ((bio = BIO_new(BIO_s_mem())) == NULL)
return NULL;
PEM_write_bio_X509(bio, xs);
n = BIO_pending(bio);
result = apr_pcalloc(p, n+1);
n = BIO_read(bio, result, n);
result[n] = NUL;
BIO_free(bio);
return result;
}
static char *ssl_var_lookup_ssl_cert_verify(apr_pool_t *p, conn_rec *c)
{
SSLConnRec *sslconn = myConnConfig(c);
char *result;
long vrc;
const char *verr;
const char *vinfo;
SSL *ssl;
X509 *xs;
result = NULL;
ssl = sslconn->ssl;
verr = sslconn->verify_error;
vinfo = sslconn->verify_info;
vrc = SSL_get_verify_result(ssl);
xs = SSL_get_peer_certificate(ssl);
if (vrc == X509_V_OK && verr == NULL && vinfo == NULL && xs == NULL)
/* no client verification done at all */
result = "NONE";
else if (vrc == X509_V_OK && verr == NULL && vinfo == NULL && xs != NULL)
/* client verification done successful */
result = "SUCCESS";
else if (vrc == X509_V_OK && vinfo != NULL && strEQ(vinfo, "GENEROUS"))
/* client verification done in generous way */
result = "GENEROUS";
else
/* client verification failed */
result = apr_psprintf(p, "FAILED:%s", verr);
if (xs)
X509_free(xs);
return result;
}
static char *ssl_var_lookup_ssl_cipher(apr_pool_t *p, conn_rec *c, char *var)
{
SSLConnRec *sslconn = myConnConfig(c);
char *result;
BOOL resdup;
int usekeysize, algkeysize;
SSL *ssl;
result = NULL;
resdup = TRUE;
ssl = sslconn->ssl;
ssl_var_lookup_ssl_cipher_bits(ssl, &usekeysize, &algkeysize);
if (ssl && strEQ(var, "")) {
SSL_CIPHER *cipher = SSL_get_current_cipher(ssl);
result = (cipher != NULL ? (char *)SSL_CIPHER_get_name(cipher) : NULL);
}
else if (strcEQ(var, "_EXPORT"))
result = (usekeysize < 56 ? "true" : "false");
else if (strcEQ(var, "_USEKEYSIZE")) {
result = apr_itoa(p, usekeysize);
resdup = FALSE;
}
else if (strcEQ(var, "_ALGKEYSIZE")) {
result = apr_itoa(p, algkeysize);
resdup = FALSE;
}
if (result != NULL && resdup)
result = apr_pstrdup(p, result);
return result;
}
static void ssl_var_lookup_ssl_cipher_bits(SSL *ssl, int *usekeysize, int *algkeysize)
{
SSL_CIPHER *cipher;
*usekeysize = 0;
*algkeysize = 0;
if (ssl != NULL)
if ((cipher = SSL_get_current_cipher(ssl)) != NULL)
*usekeysize = SSL_CIPHER_get_bits(cipher, algkeysize);
return;
}
static char *ssl_var_lookup_ssl_version(apr_pool_t *p, char *var)
{
static const char interface[] = "mod_ssl/" MOD_SSL_VERSION;
static char library_interface[] = SSL_LIBRARY_TEXT;
static char *library = NULL;
char *result;
if (!library) {
char *cp, *cp2;
library = apr_pstrdup(p, SSL_LIBRARY_DYNTEXT);
if ((cp = strchr(library, ' ')) != NULL) {
*cp = '/';
if ((cp2 = strchr(cp, ' ')) != NULL)
*cp2 = NUL;
}
if ((cp = strchr(library_interface, ' ')) != NULL) {
*cp = '/';
if ((cp2 = strchr(cp, ' ')) != NULL)
*cp2 = NUL;
}
}
if (strEQ(var, "INTERFACE")) {
result = apr_pstrdup(p, interface);
}
else if (strEQ(var, "LIBRARY_INTERFACE")) {
result = apr_pstrdup(p, library_interface);
}
else if (strEQ(var, "LIBRARY")) {
result = apr_pstrdup(p, library);
}
else {
result = NULL;
}
return result;
}
apr_array_header_t *ssl_ext_list(apr_pool_t *p, conn_rec *c, int peer,
const char *extension)
{
SSLConnRec *sslconn = myConnConfig(c);
SSL *ssl = NULL;
apr_array_header_t *array = NULL;
X509 *xs = NULL;
ASN1_OBJECT *oid = NULL;
int count = 0, j;
if (!sslconn || !sslconn->ssl || !extension) {
return NULL;
}
ssl = sslconn->ssl;
/* We accept the "extension" string to be converted as
* a long name (nsComment), short name (DN) or
* numeric OID (1.2.3.4).
*/
oid = OBJ_txt2obj(extension, 0);
if (!oid) {
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c,
"Failed to create an object for extension '%s'",
extension);
ERR_clear_error();
return NULL;
}
xs = peer ? SSL_get_peer_certificate(ssl) : SSL_get_certificate(ssl);
if (xs == NULL) {
return NULL;
}
count = X509_get_ext_count(xs);
/* Create an array large enough to accomodate every extension. This is
* likely overkill, but safe.
*/
array = apr_array_make(p, count, sizeof(char *));
for (j = 0; j < count; j++) {
X509_EXTENSION *ext = X509_get_ext(xs, j);
if (OBJ_cmp(ext->object, oid) == 0) {
BIO *bio = BIO_new(BIO_s_mem());
/* We want to obtain a string representation of the extensions
* value and add it to the array we're building.
* X509V3_EXT_print() doesn't know about all the possible
* data types, but the value is stored as an ASN1_OCTET_STRING
* allowing us a fallback in case of X509V3_EXT_print
* not knowing how to handle the data.
*/
if (X509V3_EXT_print(bio, ext, 0, 0) == 1 ||
ASN1_STRING_print(bio, ext->value) == 1) {
BUF_MEM *buf;
char **ptr = apr_array_push(array);
BIO_get_mem_ptr(bio, &buf);
*ptr = apr_pstrmemdup(p, buf->data, buf->length);
} else {
ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c,
"Found an extension '%s', but failed to "
"create a string from it", extension);
}
BIO_vfree(bio);
}
}
if (array->nelts == 0)
array = NULL;
if (peer) {
/* only SSL_get_peer_certificate raises the refcount */
X509_free(xs);
}
ERR_clear_error();
return array;
}
static char *ssl_var_lookup_ssl_compress_meth(SSL *ssl)
{
char *result = "NULL";
#ifdef OPENSSL_VERSION_NUMBER
#if (OPENSSL_VERSION_NUMBER >= 0x00908000)
SSL_SESSION *pSession = SSL_get_session(ssl);
if (pSession) {
switch (pSession->compress_meth) {
case 0:
/* default "NULL" already set */
break;
/* Defined by RFC 3749, deflate is coded by "1" */
case 1:
result = "DEFLATE";
break;
/* IANA assigned compression number for LZS */
case 0x40:
result = "LZS";
break;
default:
result = "UNKNOWN";
break;
}
}
#endif
#endif
return result;
}
/* _________________________________________________________________
**
** SSL Extension to mod_log_config
** _________________________________________________________________
*/
#include "../../modules/loggers/mod_log_config.h"
static const char *ssl_var_log_handler_c(request_rec *r, char *a);
static const char *ssl_var_log_handler_x(request_rec *r, char *a);
/*
* register us for the mod_log_config function registering phase
* to establish %{...}c and to be able to expand %{...}x variables.
*/
void ssl_var_log_config_register(apr_pool_t *p)
{
static APR_OPTIONAL_FN_TYPE(ap_register_log_handler) *log_pfn_register;
log_pfn_register = APR_RETRIEVE_OPTIONAL_FN(ap_register_log_handler);
if (log_pfn_register) {
log_pfn_register(p, "c", ssl_var_log_handler_c, 0);
log_pfn_register(p, "x", ssl_var_log_handler_x, 0);
}
return;
}
/*
* implement the %{..}c log function
* (we are the only function)
*/
static const char *ssl_var_log_handler_c(request_rec *r, char *a)
{
SSLConnRec *sslconn = myConnConfig(r->connection);
char *result;
if (sslconn == NULL || sslconn->ssl == NULL)
return NULL;
result = NULL;
if (strEQ(a, "version"))
result = ssl_var_lookup(r->pool, r->server, r->connection, r, "SSL_PROTOCOL");
else if (strEQ(a, "cipher"))
result = ssl_var_lookup(r->pool, r->server, r->connection, r, "SSL_CIPHER");
else if (strEQ(a, "subjectdn") || strEQ(a, "clientcert"))
result = ssl_var_lookup(r->pool, r->server, r->connection, r, "SSL_CLIENT_S_DN");
else if (strEQ(a, "issuerdn") || strEQ(a, "cacert"))
result = ssl_var_lookup(r->pool, r->server, r->connection, r, "SSL_CLIENT_I_DN");
else if (strEQ(a, "errcode"))
result = "-";
else if (strEQ(a, "errstr"))
result = (char *)sslconn->verify_error;
if (result != NULL && result[0] == NUL)
result = NULL;
return result;
}
/*
* extend the implementation of the %{..}x log function
* (there can be more functions)
*/
static const char *ssl_var_log_handler_x(request_rec *r, char *a)
{
char *result;
result = ssl_var_lookup(r->pool, r->server, r->connection, r, a);
if (result != NULL && result[0] == NUL)
result = NULL;
return result;
}
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