openssl: make CURLINFO_CERTINFO not truncate x509v3 fields

Avoid "reparsing" the content and instead deliver more exactly what is
provided in the certificate and avoid truncating the data after 512
bytes as done previously. This no longer removes embedded newlines.

Fixes #4837
Reported-by: bnfp on github
Closes #4841

1 files changed, 6 insertions, 25 deletions

diff --git a/lib/vtls/openssl.c b/lib/vtls/openssl.c
index 726ff6e7c..3c4066cdc 100644
--- a/lib/vtls/openssl.c
+++ b/lib/vtls/openssl.c
@@ -5,7 +5,7 @@
  *                            | (__| |_| |  _ <| |___
  *                             \___|\___/|_| \_\_____|
  *
- * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
+ * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
  *
  * This software is licensed as described in the file COPYING, which
  * you should have received as part of this distribution. The terms
@@ -3122,28 +3122,25 @@ do {                              \
 } while(0)
 #endif
 
-static int X509V3_ext(struct Curl_easy *data,
+static void X509V3_ext(struct Curl_easy *data,
                       int certnum,
                       CONST_EXTS STACK_OF(X509_EXTENSION) *exts)
 {
   int i;
-  size_t j;
 
   if((int)sk_X509_EXTENSION_num(exts) <= 0)
     /* no extensions, bail out */
-    return 1;
+    return;
 
   for(i = 0; i < (int)sk_X509_EXTENSION_num(exts); i++) {
     ASN1_OBJECT *obj;
     X509_EXTENSION *ext = sk_X509_EXTENSION_value(exts, i);
     BUF_MEM *biomem;
-    char buf[512];
-    char *ptr = buf;
     char namebuf[128];
     BIO *bio_out = BIO_new(BIO_s_mem());
 
     if(!bio_out)
-      return 1;
+      return;
 
     obj = X509_EXTENSION_get_object(ext);
 
@@ -3153,26 +3150,10 @@ static int X509V3_ext(struct Curl_easy *data,
       ASN1_STRING_print(bio_out, (ASN1_STRING *)X509_EXTENSION_get_data(ext));
 
     BIO_get_mem_ptr(bio_out, &biomem);
-
-    for(j = 0; j < (size_t)biomem->length; j++) {
-      const char *sep = "";
-      if(biomem->data[j] == '\n') {
-        sep = ", ";
-        j++; /* skip the newline */
-      };
-      while((j<(size_t)biomem->length) && (biomem->data[j] == ' '))
-        j++;
-      if(j<(size_t)biomem->length)
-        ptr += msnprintf(ptr, sizeof(buf)-(ptr-buf), "%s%c", sep,
-                         biomem->data[j]);
-    }
-
-    Curl_ssl_push_certinfo(data, certnum, namebuf, buf);
-
+    Curl_ssl_push_certinfo_len(data, certnum, namebuf, biomem->data,
+                               biomem->length);
     BIO_free(bio_out);
-
   }
-  return 0; /* all is fine */
 }
 
 #ifdef OPENSSL_IS_BORINGSSL