Fix memory overrun in rsa padding check functions

[oweals/openssl.git] / crypto / conf / conf_def.c

diff --git a/crypto/conf/conf_def.c b/crypto/conf/conf_def.c
index 752859d9e7d0c6331fa6a181a965d4791a6d7ac7..8e3f42a0caca2928824d5e468e098aabd88abbc5 100644 (file)
--- a/crypto/conf/conf_def.c
+++ b/crypto/conf/conf_def.c
@@ -1,5 +1,5 @@
 /*
- * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 1995-2019 The OpenSSL Project Authors. All Rights Reserved.
  *
  * Licensed under the OpenSSL license (the "License").  You may not use
  * this file except in compliance with the License.  You can obtain a copy
@@ -27,12 +27,17 @@
 # endif
 #endif
 
+#ifndef S_ISDIR
+# define S_ISDIR(a) (((a) & S_IFMT) == S_IFDIR)
+#endif
+
 /*
  * The maximum length we can grow a value to after variable expansion. 64k
  * should be more than enough for all reasonable uses.
  */
 #define MAX_CONF_VALUE_LENGTH       65536
 
+static int is_keytype(const CONF *conf, char c, unsigned short type);
 static char *eat_ws(CONF *conf, char *p);
 static void trim_ws(CONF *conf, char *start);
 static char *eat_alpha_numeric(CONF *conf, char *p);
@@ -84,12 +89,12 @@ static CONF_METHOD WIN32_method = {
     def_load
 };
 
-CONF_METHOD *NCONF_default()
+CONF_METHOD *NCONF_default(void)
 {
     return &default_method;
 }
 
-CONF_METHOD *NCONF_WIN32()
+CONF_METHOD *NCONF_WIN32(void)
 {
     return &WIN32_method;
 }
@@ -343,10 +348,15 @@ static int def_load_bio(CONF *conf, BIO *in, long *line)
                 psection = section;
             }
             p = eat_ws(conf, end);
-            if (strncmp(pname, ".include", 8) == 0 && p != pname + 8) {
+            if (strncmp(pname, ".include", 8) == 0
+                && (p != pname + 8 || *p == '=')) {
                 char *include = NULL;
                 BIO *next;
 
+                if (*p == '=') {
+                    p++;
+                    p = eat_ws(conf, p);
+                }
                 trim_ws(conf, p);
                 if (!str_copy(conf, psection, &include, p))
                     goto err;
@@ -419,12 +429,26 @@ static int def_load_bio(CONF *conf, BIO *in, long *line)
     }
     BUF_MEM_free(buff);
     OPENSSL_free(section);
-    sk_BIO_pop_free(biosk, BIO_vfree);
+    /*
+     * No need to pop, since we only get here if the stack is empty.
+     * If this causes a BIO leak, THE ISSUE IS SOMEWHERE ELSE!
+     */
+    sk_BIO_free(biosk);
     return 1;
  err:
     BUF_MEM_free(buff);
     OPENSSL_free(section);
-    sk_BIO_pop_free(biosk, BIO_vfree);
+    /*
+     * Since |in| is the first element of the stack and should NOT be freed
+     * here, we cannot use sk_BIO_pop_free().  Instead, we pop and free one
+     * BIO at a time, making sure that the last one popped isn't.
+     */
+    while (sk_BIO_num(biosk) > 0) {
+        BIO *popped = sk_BIO_pop(biosk);
+        BIO_vfree(in);
+        in = popped;
+    }
+    sk_BIO_free(biosk);
 #ifndef OPENSSL_NO_POSIX_IO
     OPENSSL_free(dirpath);
     if (dirctx != NULL)
@@ -558,7 +582,7 @@ static int str_copy(CONF *conf, char *section, char **pto, char *from)
                 s++;
             cp = section;
             e = np = s;
-            while (IS_ALPHA_NUMERIC(conf, *e))
+            while (IS_ALNUM(conf, *e))
                 e++;
             if ((e[0] == ':') && (e[1] == ':')) {
                 cp = np;
@@ -567,7 +591,7 @@ static int str_copy(CONF *conf, char *section, char **pto, char *from)
                 *rrp = '\0';
                 e += 2;
                 np = e;
-                while (IS_ALPHA_NUMERIC(conf, *e))
+                while (IS_ALNUM(conf, *e))
                     e++;
             }
             r = *e;
@@ -655,7 +679,7 @@ static BIO *process_include(char *include, OPENSSL_DIR_CTX **dirctx,
         return NULL;
     }
 
-    if ((st.st_mode & S_IFDIR) == S_IFDIR) {
+    if (S_ISDIR(st.st_mode)) {
         if (*dirctx != NULL) {
             CONFerr(CONF_F_PROCESS_INCLUDE,
                     CONF_R_RECURSIVE_DIRECTORY_INCLUDE);
@@ -732,6 +756,30 @@ static BIO *get_next_file(const char *path, OPENSSL_DIR_CTX **dirctx)
 }
 #endif
 
+static int is_keytype(const CONF *conf, char c, unsigned short type)
+{
+    const unsigned short * keytypes = (const unsigned short *) conf->meth_data;
+    unsigned char key = (unsigned char)c;
+
+#ifdef CHARSET_EBCDIC
+# if CHAR_BIT > 8
+    if (key > 255) {
+        /* key is out of range for os_toascii table */
+        return 0;
+    }
+# endif
+    /* convert key from ebcdic to ascii */
+    key = os_toascii[key];
+#endif
+
+    if (key > 127) {
+        /* key is not a seven bit ascii character */
+        return 0;
+    }
+
+    return (keytypes[key] & type) ? 1 : 0;
+}
+
 static char *eat_ws(CONF *conf, char *p)
 {
     while (IS_WS(conf, *p) && (!IS_EOF(conf, *p)))
@@ -759,7 +807,7 @@ static char *eat_alpha_numeric(CONF *conf, char *p)
             p = scan_esc(conf, p);
             continue;
         }
-        if (!IS_ALPHA_NUMERIC_PUNCT(conf, *p))
+        if (!IS_ALNUM_PUNCT(conf, *p))
             return p;
         p++;
     }