Use retval from sprintf while walking buffers

[exim.git] / src / src / tlscert-openssl.c

diff --git a/src/src/tlscert-openssl.c b/src/src/tlscert-openssl.c
index 4d45ad9f91b7dd127fcba16085fadf3075bac9fd..87623a8794be6f24ee4df83fa7eb2f14620454b6 100644 (file)
--- a/src/src/tlscert-openssl.c
+++ b/src/src/tlscert-openssl.c
@@ -2,7 +2,7 @@
 *     Exim - an Internet mail transport agent    *
 *************************************************/
 
-/* Copyright (c) Jeremy Harris 2014 - 2015 */
+/* Copyright (c) Jeremy Harris 2014 - 2016 */
 
 /* This module provides TLS (aka SSL) support for Exim using the OpenSSL
 library. It is #included into the tls.c file when that library is used.
@@ -17,6 +17,10 @@ library. It is #included into the tls.c file when that library is used.
 #include <openssl/rand.h>
 #include <openssl/x509v3.h>
 
+#if OPENSSL_VERSION_NUMBER >= 0x10100000L
+# define EXIM_HAVE_ASN1_MACROS
+#endif
+
 
 /*****************************************************
 *  Export/import a certificate, binary/printable
@@ -119,7 +123,7 @@ int len;
 if (!bp)
   return badalloc();
 len = ASN1_TIME_print(bp, asntime);
-len = len > 0 ? (int) BIO_get_mem_data(bp, &s) : 0;
+len = len > 0 ? (int) BIO_get_mem_data(bp, CSS &s) : 0;
 
 if (mod && Ustrcmp(mod, "raw") == 0)           /* native ASN */
   s = string_copyn(s, len);
@@ -137,7 +141,7 @@ else
   /*XXX %Z might be glibc-specific?  Solaris has it, at least*/
   /*XXX should we switch to POSIX locale for this? */
   tm.tm_isdst = 0;
-  if (!strptime(CCS s, "%b %e %T %Y %Z", &tm))
+  if (!len || !strptime(CCS s, "%b %e %T %Y %Z", &tm))
     expand_string_message = US"failed time conversion";
 
   else
@@ -314,17 +318,20 @@ uschar * cp3;
 
 if (!bp) return badalloc();
 
+#ifdef EXIM_HAVE_ASN1_MACROS
+ASN1_STRING_print(bp, adata);
+#else
 M_ASN1_OCTET_STRING_print(bp, adata);
-/* binary data, DER encoded */
+#endif
 
+/* binary data, DER encoded */
 /* just dump for now */
 len = BIO_get_mem_data(bp, &cp1);
 cp3 = cp2 = store_get(len*3+1);
 
 while(len)
   {
-  sprintf(CS cp2, "%.2x ", *cp1++);
-  cp2 += 3;
+  cp2 += sprintf(CS cp2, "%.2x ", *cp1++);
   len--;
   }
 cp2[-1] = '\0';
@@ -336,6 +343,7 @@ uschar *
 tls_cert_subject_altname(void * cert, uschar * mod)
 {
 uschar * list = NULL;
+int lsize = 0, llen = 0;
 STACK_OF(GENERAL_NAME) * san = (STACK_OF(GENERAL_NAME) *)
   X509_get_ext_d2i((X509 *)cert, NID_subject_alt_name, NULL, NULL);
 uschar osep = '\n';
@@ -386,7 +394,7 @@ while (sk_GENERAL_NAME_num(san) > 0)
     ele = string_copyn(ele, len);
 
   if (Ustrlen(ele) == len)     /* ignore any with embedded nul */
-    list = string_append_listele(list, osep,
+    list = string_append_listele(list, &lsize, &llen, osep,
          match == -1 ? string_sprintf("%s=%s", tag, ele) : ele);
   }
 
@@ -403,6 +411,7 @@ int adsnum = sk_ACCESS_DESCRIPTION_num(ads);
 int i;
 uschar sep = '\n';
 uschar * list = NULL;
+int size = 0, len = 0;
 
 if (mod)
   if (*mod == '>' && *++mod) sep = *mod++;
@@ -412,11 +421,9 @@ for (i = 0; i < adsnum; i++)
   ACCESS_DESCRIPTION * ad = sk_ACCESS_DESCRIPTION_value(ads, i);
 
   if (ad && OBJ_obj2nid(ad->method) == NID_ad_OCSP)
-    {
-    uschar * ele = ASN1_STRING_data(ad->location->d.ia5);
-    int len =  ASN1_STRING_length(ad->location->d.ia5);
-    list = string_append_listele_n(list, sep, ele, len);
-    }
+    list = string_append_listele_n(list, &size, &len, sep,
+      ASN1_STRING_data(ad->location->d.ia5),
+      ASN1_STRING_length(ad->location->d.ia5));
   }
 sk_ACCESS_DESCRIPTION_free(ads);
 return list;
@@ -433,6 +440,7 @@ int dpsnum = sk_DIST_POINT_num(dps);
 int i;
 uschar sep = '\n';
 uschar * list = NULL;
+int size = 0, len = 0;
 
 if (mod)
   if (*mod == '>' && *++mod) sep = *mod++;
@@ -449,11 +457,9 @@ if (dps) for (i = 0; i < dpsnum; i++)
       if (  (np = sk_GENERAL_NAME_value(names, j))
         && np->type == GEN_URI
         )
-       {
-       uschar * ele = ASN1_STRING_data(np->d.uniformResourceIdentifier);
-       int len =  ASN1_STRING_length(np->d.uniformResourceIdentifier);
-       list = string_append_listele_n(list, sep, ele, len);
-       }
+       list = string_append_listele_n(list, &size, &len,  sep,
+         ASN1_STRING_data(np->d.uniformResourceIdentifier),
+         ASN1_STRING_length(np->d.uniformResourceIdentifier));
     }
 sk_DIST_POINT_free(dps);
 return list;