Adding upstream version 2.4.56.upstream/2.4.56

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

1 files changed, 177 insertions, 0 deletions

diff --git a/modules/ssl/ssl_engine_rand.c b/modules/ssl/ssl_engine_rand.c
new file mode 100644
index 0000000..4e1a9c1
--- /dev/null
+++ b/modules/ssl/ssl_engine_rand.c
@@ -0,0 +1,177 @@
+/* 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_rand.c
+ *  Random Number Generator Seeding
+ */
+                             /* ``The generation of random
+                                  numbers is too important
+                                  to be left to chance.'' */
+
+#include "ssl_private.h"
+
+/*  _________________________________________________________________
+**
+**  Support for better seeding of SSL library's RNG
+**  _________________________________________________________________
+*/
+
+static int ssl_rand_choosenum(int, int);
+static int ssl_rand_feedfp(apr_pool_t *, apr_file_t *, int);
+
+int ssl_rand_seed(server_rec *s, apr_pool_t *p, ssl_rsctx_t nCtx, char *prefix)
+{
+    SSLModConfigRec *mc;
+    apr_array_header_t *apRandSeed;
+    ssl_randseed_t *pRandSeeds;
+    ssl_randseed_t *pRandSeed;
+    unsigned char stackdata[256];
+    int nDone;
+    apr_file_t *fp;
+    int i, n, l;
+
+    mc = myModConfig(s);
+    nDone = 0;
+    apRandSeed = mc->aRandSeed;
+    pRandSeeds = (ssl_randseed_t *)apRandSeed->elts;
+    for (i = 0; i < apRandSeed->nelts; i++) {
+        pRandSeed = &pRandSeeds[i];
+        if (pRandSeed->nCtx == nCtx) {
+            if (pRandSeed->nSrc == SSL_RSSRC_FILE) {
+                /*
+                 * seed in contents of an external file
+                 */
+                if (apr_file_open(&fp, pRandSeed->cpPath,
+                                  APR_READ, APR_OS_DEFAULT, p) != APR_SUCCESS)
+                    continue;
+                nDone += ssl_rand_feedfp(p, fp, pRandSeed->nBytes);
+                apr_file_close(fp);
+            }
+            else if (pRandSeed->nSrc == SSL_RSSRC_EXEC) {
+                const char *cmd = pRandSeed->cpPath;
+                const char **argv = apr_palloc(p, sizeof(char *) * 3);
+                /*
+                 * seed in contents generated by an external program
+                 */
+                argv[0] = cmd;
+                argv[1] = apr_itoa(p, pRandSeed->nBytes);
+                argv[2] = NULL;
+
+                if ((fp = ssl_util_ppopen(s, p, cmd, argv)) == NULL)
+                    continue;
+                nDone += ssl_rand_feedfp(p, fp, pRandSeed->nBytes);
+                ssl_util_ppclose(s, p, fp);
+            }
+#ifdef HAVE_RAND_EGD
+            else if (pRandSeed->nSrc == SSL_RSSRC_EGD) {
+                /*
+                 * seed in contents provided by the external
+                 * Entropy Gathering Daemon (EGD)
+                 */
+                if ((n = RAND_egd(pRandSeed->cpPath)) == -1)
+                    continue;
+                nDone += n;
+            }
+#endif
+            else if (pRandSeed->nSrc == SSL_RSSRC_BUILTIN) {
+                struct {
+                    time_t t;
+                    pid_t pid;
+                } my_seed;
+
+                /*
+                 * seed in the current time (usually just 4 bytes)
+                 */
+                my_seed.t = time(NULL);
+
+                /*
+                 * seed in the current process id (usually just 4 bytes)
+                 */
+                my_seed.pid = mc->pid;
+
+                l = sizeof(my_seed);
+                RAND_seed((unsigned char *)&my_seed, l);
+                nDone += l;
+
+                /*
+                 * seed in some current state of the run-time stack (128 bytes)
+                 */
+                n = ssl_rand_choosenum(0, sizeof(stackdata)-128-1);
+                RAND_seed(stackdata+n, 128);
+                nDone += 128;
+
+            }
+        }
+    }
+    ap_log_error(APLOG_MARK, APLOG_TRACE2, 0, s,
+                 "%sSeeding PRNG with %d bytes of entropy", prefix, nDone);
+
+    if (RAND_status() == 0)
+        ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(01990)
+                     "%sPRNG still contains insufficient entropy!", prefix);
+
+    return nDone;
+}
+
+#define BUFSIZE 8192
+
+static int ssl_rand_feedfp(apr_pool_t *p, apr_file_t *fp, int nReq)
+{
+    apr_size_t nDone;
+    unsigned char caBuf[BUFSIZE];
+    apr_size_t nBuf;
+    apr_size_t nRead;
+    apr_size_t nTodo;
+
+    nDone = 0;
+    nRead = BUFSIZE;
+    nTodo = nReq;
+    while (1) {
+        if (nReq > 0)
+            nRead = (nTodo < BUFSIZE ? nTodo : BUFSIZE);
+        nBuf = nRead;
+        if (apr_file_read(fp, caBuf, &nBuf) != APR_SUCCESS)
+            break;
+        RAND_seed(caBuf, nBuf);
+        nDone += nBuf;
+        if (nReq > 0) {
+            nTodo -= nBuf;
+            if (nTodo <= 0)
+                break;
+        }
+    }
+    return nDone;
+}
+
+static int ssl_rand_choosenum(int l, int h)
+{
+    int i;
+    char buf[50];
+
+    apr_snprintf(buf, sizeof(buf), "%.0f",
+                 (((double)(rand()%RAND_MAX)/RAND_MAX)*(h-l)));
+    i = atoi(buf)+1;
+    if (i < l) i = l;
+    if (i > h) i = h;
+    return i;
+}
+