Adding upstream version 2.4.56.upstream/2.4.56

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 422 insertions, 0 deletions

diff --git a/modules/ssl/ssl_util_ocsp.c b/modules/ssl/ssl_util_ocsp.c
new file mode 100644
index 0000000..b9c8a0b
--- /dev/null
+++ b/modules/ssl/ssl_util_ocsp.c
@@ -0,0 +1,422 @@
+/* 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.
+ */
+
+/* This file implements an OCSP client including a toy HTTP/1.0
+ * client.  Once httpd depends on a real HTTP client library, most of
+ * this can be thrown away. */
+
+#include "ssl_private.h"
+
+#ifndef OPENSSL_NO_OCSP
+
+#include "apr_buckets.h"
+#include "apr_uri.h"
+
+/* Serialize an OCSP request which will be sent to the responder at
+ * given URI to a memory BIO object, which is returned. */
+static BIO *serialize_request(OCSP_REQUEST *req, const apr_uri_t *uri,
+                              const apr_uri_t *proxy_uri)
+{
+    BIO *bio;
+    int len;
+
+    len = i2d_OCSP_REQUEST(req, NULL);
+
+    bio = BIO_new(BIO_s_mem());
+
+    BIO_printf(bio, "POST ");
+    /* Use full URL instead of URI in case of a request through a proxy */
+    if (proxy_uri) {
+        BIO_printf(bio, "http://%s:%d",
+                   uri->hostname, uri->port);
+    }
+    BIO_printf(bio, "%s%s%s HTTP/1.0\r\n"
+               "Host: %s:%d\r\n"
+               "Content-Type: application/ocsp-request\r\n"
+               "Connection: close\r\n"
+               "Content-Length: %d\r\n"
+               "\r\n",
+               uri->path ? uri->path : "/",
+               uri->query ? "?" : "", uri->query ? uri->query : "",
+               uri->hostname, uri->port, len);
+
+    if (i2d_OCSP_REQUEST_bio(bio, req) != 1) {
+        BIO_free(bio);
+        return NULL;
+    }
+
+    return bio;
+}
+
+/* Send the OCSP request serialized into BIO 'request' to the
+ * responder at given server given by URI.  Returns socket object or
+ * NULL on error. */
+static apr_socket_t *send_request(BIO *request, const apr_uri_t *uri,
+                                  apr_interval_time_t timeout,
+                                  conn_rec *c, apr_pool_t *p,
+                                  const apr_uri_t *proxy_uri)
+{
+    apr_status_t rv;
+    apr_sockaddr_t *sa;
+    apr_socket_t *sd;
+    char buf[HUGE_STRING_LEN];
+    int len;
+    const apr_uri_t *next_hop_uri;
+
+    if (proxy_uri) {
+        next_hop_uri = proxy_uri;
+    }
+    else {
+        next_hop_uri = uri;
+    }
+
+    rv = apr_sockaddr_info_get(&sa, next_hop_uri->hostname, APR_UNSPEC,
+                               next_hop_uri->port, 0, p);
+    if (rv) {
+        ap_log_cerror(APLOG_MARK, APLOG_ERR, rv, c, APLOGNO(01972)
+                      "could not resolve address of %s %s",
+                      proxy_uri ? "proxy" : "OCSP responder",
+                      next_hop_uri->hostinfo);
+        return NULL;
+    }
+
+    /* establish a connection to the OCSP responder */
+    ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(01973)
+                  "connecting to %s '%s'",
+                  proxy_uri ? "proxy" : "OCSP responder",
+                  uri->hostinfo);
+
+    /* Cycle through address until a connect() succeeds. */
+    for (; sa; sa = sa->next) {
+        rv = apr_socket_create(&sd, sa->family, SOCK_STREAM, APR_PROTO_TCP, p);
+        if (rv == APR_SUCCESS) {
+            apr_socket_timeout_set(sd, timeout);
+
+            rv = apr_socket_connect(sd, sa);
+            if (rv == APR_SUCCESS) {
+                break;
+            }
+            apr_socket_close(sd);
+        }
+    }
+
+    if (sa == NULL) {
+        ap_log_cerror(APLOG_MARK, APLOG_ERR, rv, c, APLOGNO(01974)
+                      "could not connect to %s '%s'",
+                      proxy_uri ? "proxy" : "OCSP responder",
+                      next_hop_uri->hostinfo);
+        return NULL;
+    }
+
+    /* send the request and get a response */
+    ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(01975)
+                 "sending request to OCSP responder");
+
+    while ((len = BIO_read(request, buf, sizeof buf)) > 0) {
+        char *wbuf = buf;
+        apr_size_t remain = len;
+
+        do {
+            apr_size_t wlen = remain;
+
+            rv = apr_socket_send(sd, wbuf, &wlen);
+            wbuf += remain;
+            remain -= wlen;
+        } while (rv == APR_SUCCESS && remain > 0);
+
+        if (rv) {
+            apr_socket_close(sd);
+            ap_log_cerror(APLOG_MARK, APLOG_ERR, rv, c, APLOGNO(01976)
+                          "failed to send request to OCSP responder '%s'",
+                          uri->hostinfo);
+            return NULL;
+        }
+    }
+
+    return sd;
+}
+
+/* Return a pool-allocated NUL-terminated line, with CRLF stripped,
+ * read from brigade 'bbin' using 'bbout' as temporary storage. */
+static char *get_line(apr_bucket_brigade *bbout, apr_bucket_brigade *bbin,
+                      conn_rec *c, apr_pool_t *p)
+{
+    apr_status_t rv;
+    apr_size_t len;
+    char *line;
+
+    apr_brigade_cleanup(bbout);
+
+    rv = apr_brigade_split_line(bbout, bbin, APR_BLOCK_READ, 8192);
+    if (rv) {
+        ap_log_cerror(APLOG_MARK, APLOG_ERR, rv, c, APLOGNO(01977)
+                      "failed reading line from OCSP server");
+        return NULL;
+    }
+
+    rv = apr_brigade_pflatten(bbout, &line, &len, p);
+    if (rv) {
+        ap_log_cerror(APLOG_MARK, APLOG_ERR, rv, c, APLOGNO(01978)
+                      "failed reading line from OCSP server");
+        return NULL;
+    }
+
+    if (len == 0) {
+        ap_log_cerror(APLOG_MARK, APLOG_ERR, rv, c, APLOGNO(02321)
+                      "empty response from OCSP server");
+        return NULL;
+    }
+
+    if (line[len-1] != APR_ASCII_LF) {
+        ap_log_cerror(APLOG_MARK, APLOG_ERR, rv, c, APLOGNO(01979)
+                      "response header line too long from OCSP server");
+        return NULL;
+    }
+
+    line[len-1] = '\0';
+    if (len > 1 && line[len-2] == APR_ASCII_CR) {
+        line[len-2] = '\0';
+    }
+
+    return line;
+}
+
+/* Maximum values to prevent eating RAM forever. */
+#define MAX_HEADERS (256)
+#define MAX_CONTENT (2048 * 1024)
+
+/* Read the OCSP response from the socket 'sd', using temporary memory
+ * BIO 'bio', and return the decoded OCSP response object, or NULL on
+ * error. */
+static OCSP_RESPONSE *read_response(apr_socket_t *sd, BIO *bio, conn_rec *c,
+                                    apr_pool_t *p)
+{
+    apr_bucket_brigade *bb, *tmpbb;
+    OCSP_RESPONSE *response;
+    char *line;
+    apr_size_t count;
+    apr_int64_t code;
+
+    /* Using brigades for response parsing is much simpler than using
+     * apr_socket_* directly. */
+    bb = apr_brigade_create(p, c->bucket_alloc);
+    tmpbb = apr_brigade_create(p, c->bucket_alloc);
+    APR_BRIGADE_INSERT_TAIL(bb, apr_bucket_socket_create(sd, c->bucket_alloc));
+
+    line = get_line(tmpbb, bb, c, p);
+    if (!line || strncmp(line, "HTTP/", 5)
+        || (line = ap_strchr(line, ' ')) == NULL
+        || (code = apr_atoi64(++line)) < 200 || code > 299) {
+        ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c, APLOGNO(01980)
+                      "bad response from OCSP server: %s",
+                      line ? line : "(none)");
+        return NULL;
+    }
+
+    /* Read till end of headers; don't have to even bother parsing the
+     * Content-Length since the server is obliged to close the
+     * connection after the response anyway for HTTP/1.0. */
+    count = 0;
+    while ((line = get_line(tmpbb, bb, c, p)) != NULL && line[0]
+           && ++count < MAX_HEADERS) {
+        ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(01981)
+                      "OCSP response header: %s", line);
+    }
+
+    if (count == MAX_HEADERS) {
+        ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c, APLOGNO(01982)
+                      "could not read response headers from OCSP server, "
+                      "exceeded maximum count (%u)", MAX_HEADERS);
+        return NULL;
+    }
+    else if (!line) {
+        ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c, APLOGNO(01983)
+                      "could not read response header from OCSP server");
+        return NULL;
+    }
+
+    /* Read the response body into the memory BIO. */
+    count = 0;
+    while (!APR_BRIGADE_EMPTY(bb)) {
+        const char *data;
+        apr_size_t len;
+        apr_status_t rv;
+        apr_bucket *e = APR_BRIGADE_FIRST(bb);
+
+        rv = apr_bucket_read(e, &data, &len, APR_BLOCK_READ);
+        if (rv == APR_EOF) {
+            ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(01984)
+                          "OCSP response: got EOF");
+            break;
+        }
+        if (rv != APR_SUCCESS) {
+            ap_log_cerror(APLOG_MARK, APLOG_ERR, rv, c, APLOGNO(01985)
+                          "error reading response from OCSP server");
+            return NULL;
+        }
+        if (len == 0) {
+            /* Ignore zero-length buckets (possible side-effect of
+             * line splitting). */
+            apr_bucket_delete(e);
+            continue;
+        }
+        count += len;
+        if (count > MAX_CONTENT) {
+            ap_log_cerror(APLOG_MARK, APLOG_ERR, rv, c, APLOGNO(01986)
+                          "OCSP response size exceeds %u byte limit",
+                          MAX_CONTENT);
+            return NULL;
+        }
+        ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(01987)
+                      "OCSP response: got %" APR_SIZE_T_FMT
+                      " bytes, %" APR_SIZE_T_FMT " total", len, count);
+
+        BIO_write(bio, data, (int)len);
+        apr_bucket_delete(e);
+    }
+
+    apr_brigade_destroy(bb);
+    apr_brigade_destroy(tmpbb);
+
+    /* Finally decode the OCSP response from what's stored in the
+     * bio. */
+    response = d2i_OCSP_RESPONSE_bio(bio, NULL);
+    if (response == NULL) {
+        ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c, APLOGNO(01988)
+                      "failed to decode OCSP response data");
+        ssl_log_ssl_error(SSLLOG_MARK, APLOG_ERR, mySrvFromConn(c));
+    }
+
+    return response;
+}
+
+OCSP_RESPONSE *modssl_dispatch_ocsp_request(const apr_uri_t *uri,
+                                            apr_interval_time_t timeout,
+                                            OCSP_REQUEST *request,
+                                            conn_rec *c, apr_pool_t *p)
+{
+    OCSP_RESPONSE *response = NULL;
+    apr_socket_t *sd;
+    BIO *bio;
+    const apr_uri_t *proxy_uri;
+
+    proxy_uri = (mySrvConfigFromConn(c))->server->proxy_uri;
+    bio = serialize_request(request, uri, proxy_uri);
+    if (bio == NULL) {
+        ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c, APLOGNO(01989)
+                      "could not serialize OCSP request");
+        ssl_log_ssl_error(SSLLOG_MARK, APLOG_ERR, mySrvFromConn(c));
+        return NULL;
+    }
+
+    sd = send_request(bio, uri, timeout, c, p, proxy_uri);
+    if (sd == NULL) {
+        /* Errors already logged. */
+        BIO_free(bio);
+        return NULL;
+    }
+
+    /* Clear the BIO contents, ready for the response. */
+    (void)BIO_reset(bio);
+
+    response = read_response(sd, bio, c, p);
+
+    apr_socket_close(sd);
+    BIO_free(bio);
+
+    return response;
+}
+
+/*  _________________________________________________________________
+**
+**  OCSP other certificate support
+**  _________________________________________________________________
+*/
+
+/*
+ * Read a file that contains certificates in PEM format and
+ * return as a STACK.
+ */
+
+static STACK_OF(X509) *modssl_read_ocsp_certificates(const char *file)
+{
+    BIO *bio;
+    X509 *x509;
+    unsigned long err;
+    STACK_OF(X509) *other_certs = NULL;
+
+    if ((bio = BIO_new(BIO_s_file())) == NULL)
+        return NULL;
+    if (BIO_read_filename(bio, file) <= 0) {
+        BIO_free(bio);
+        return NULL;
+    }
+
+    /* create new extra chain by loading the certs */
+    ERR_clear_error();
+    while ((x509 = PEM_read_bio_X509(bio, NULL, NULL, NULL)) != NULL) {
+        if (!other_certs) {
+                other_certs = sk_X509_new_null();
+                if (!other_certs)
+                        return NULL;
+        }
+                
+        if (!sk_X509_push(other_certs, x509)) {
+            X509_free(x509);
+            sk_X509_pop_free(other_certs, X509_free);
+            BIO_free(bio);
+            return NULL;
+        }
+    }
+    /* 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);
+            sk_X509_pop_free(other_certs, X509_free);
+            return NULL;
+        }
+        while (ERR_get_error() > 0) ;
+    }
+    BIO_free(bio);
+    return other_certs;
+}
+
+void ssl_init_ocsp_certificates(server_rec *s, modssl_ctx_t *mctx)
+{
+    /*
+     * Configure Trusted OCSP certificates.
+     */
+
+    if (!mctx->ocsp_certs_file) {
+        return;
+    }
+
+    ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, s,
+                 "Configuring Trusted OCSP certificates");
+
+    mctx->ocsp_certs = modssl_read_ocsp_certificates(mctx->ocsp_certs_file);
+
+    if (!mctx->ocsp_certs) {
+        ap_log_error(APLOG_MARK, APLOG_ERR, 0, s,
+                "Unable to configure OCSP Trusted Certificates");
+        ssl_log_ssl_error(SSLLOG_MARK, APLOG_ERR, s);
+        ssl_die(s);
+    }
+    mctx->ocsp_verify_flags |= OCSP_TRUSTOTHER;
+}
+
+#endif /* HAVE_OCSP */