X-Git-Url: https://vcs.fsf.org/?p=exim.git;a=blobdiff_plain;f=src%2Fsrc%2Fbase64.c;h=29f9c77b0d59746cc17c8963df92ddad4d841cf9;hp=ae6874b8a8b255335116fd81ef4746d5c40ffdbe;hb=1e1ddfac79fbcd052f199500a6493c7f79cb8462;hpb=286b9d5fa4344de72fe6575fa089237fd7dbb56f

diff --git a/src/src/base64.c b/src/src/base64.c
index ae6874b8a..29f9c77b0 100644
--- a/src/src/base64.c
+++ b/src/src/base64.c
@@ -5,7 +5,8 @@
 /* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2004, 2015 */
 /* License: GPL */
 
-/* Copyright (c) University of Cambridge 1995 - 2017 */
+/* Copyright (c) University of Cambridge 1995 - 2018 */
+/* Copyright (c) The Exim Maintainers 2020 */
 /* See the file NOTICE for conditions of use and distribution. */
 
 
@@ -38,7 +39,7 @@ ssize_t
 mime_decode_base64(FILE * in, FILE * out, uschar * boundary)
 {
 uschar ibuf[MIME_MAX_LINE_LENGTH], obuf[MIME_MAX_LINE_LENGTH];
-uschar *ipos, *opos;
+uschar *opos;
 ssize_t len, size = 0;
 int bytestate = 0;
 
@@ -52,7 +53,7 @@ while (Ufgets(ibuf, MIME_MAX_LINE_LENGTH, in) != NULL)
      )
     break;
 
-  for (ipos = ibuf ; *ipos != '\r' && *ipos != '\n' && *ipos != 0; ++ipos)
+  for (uschar * ipos = ibuf ; *ipos != '\r' && *ipos != '\n' && *ipos; ++ipos)
     if (*ipos == '=')			/* skip padding */
       ++bytestate;
 
@@ -152,10 +153,14 @@ static uschar dec64table[] = {
 int
 b64decode(const uschar *code, uschar **ptr)
 {
+
 int x, y;
-uschar *result = store_get(3*(Ustrlen(code)/4) + 1);
+uschar *result;
 
-*ptr = result;
+{
+  int l = Ustrlen(code);
+  *ptr = result = store_get(1 + l/4 * 3 + l%4, is_tainted(code));
+}
 
 /* Each cycle of the loop handles a quantum of 4 input bytes. For the last
 quantum this may decode to 1, 2, or 3 output bytes. */
@@ -169,7 +174,7 @@ while ((x = *code++) != 0)
 
   while (isspace(y = *code++)) ;
   /* debug_printf("b64d: '%c'\n", y); */
-  if (y == 0 || (y = dec64table[y]) == 255)
+  if (y > 127 || (y = dec64table[y]) == 255)
     return -1;
 
   *result++ = (x << 2) | (y >> 4);
@@ -238,9 +243,9 @@ static uschar *enc64table =
   US"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
 
 uschar *
-b64encode(uschar *clear, int len)
+b64encode_taint(const uschar * clear, int len, BOOL tainted)
 {
-uschar *code = store_get(4*((len+2)/3) + 1);
+uschar *code = store_get(4*((len+2)/3) + 1, tainted);
 uschar *p = code;
 
 while (len-- >0)
@@ -279,6 +284,12 @@ while (len-- >0)
 return code;
 }
 
+uschar *
+b64encode(const uschar * clear, int len)
+{
+return b64encode_taint(clear, len, is_tainted(clear));
+}
+
 
 /* End of base64.c */
 /* vi: sw ai sw=2