From: Patrick Schlangen <patrick@schlangen.me>
Date: Wed, 10 Jan 2018 17:06:35 +0000 (-0500)
Subject: Make data argument const in SSL_dane_tlsa_add
X-Git-Tag: OpenSSL_1_1_0h~138
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=19c708d77d6b61fbd46c13d43f2b078eae5362f9;p=openssl

Make data argument const in SSL_dane_tlsa_add

The data argument of SSL_dane_tlsa_add is used read-only, so it
should be const.

Reviewed-by: Viktor Dukhovni <viktor@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/5056)

(cherry picked from commit a41a6120cdcb7e883481bc1bed55e7157c9255c4)
---

diff --git a/doc/ssl/SSL_CTX_dane_enable.pod b/doc/ssl/SSL_CTX_dane_enable.pod
index cb71d3aafe..288a12ff88 100644
--- a/doc/ssl/SSL_CTX_dane_enable.pod
+++ b/doc/ssl/SSL_CTX_dane_enable.pod
@@ -76,6 +76,8 @@ TLSA records that apply to the remote TLS peer.
 The arguments specify the fields of the TLSA record.
 The B<data> field is provided in binary (wire RDATA) form, not the hexadecimal
 ASCII presentation form, with an explicit length passed via B<dlen>.
+The library takes a copy of the B<data> buffer contents and the caller may
+free the original B<data> buffer when convenient.
 A return value of 0 indicates that "unusable" TLSA records (with invalid or
 unsupported parameters) were provided.
 A negative return value indicates an internal error in processing the record.
diff --git a/include/openssl/ssl.h b/include/openssl/ssl.h
index 4cdcdcf38b..0d0866314d 100644
--- a/include/openssl/ssl.h
+++ b/include/openssl/ssl.h
@@ -1529,7 +1529,7 @@ __owur int SSL_CTX_dane_mtype_set(SSL_CTX *ctx, const EVP_MD *md,
                                   uint8_t mtype, uint8_t ord);
 __owur int SSL_dane_enable(SSL *s, const char *basedomain);
 __owur int SSL_dane_tlsa_add(SSL *s, uint8_t usage, uint8_t selector,
-                             uint8_t mtype, unsigned char *data, size_t dlen);
+                             uint8_t mtype, unsigned const char *data, size_t dlen);
 __owur int SSL_get0_dane_authority(SSL *s, X509 **mcert, EVP_PKEY **mspki);
 __owur int SSL_get0_dane_tlsa(SSL *s, uint8_t *usage, uint8_t *selector,
                               uint8_t *mtype, unsigned const char **data,
diff --git a/ssl/ssl_lib.c b/ssl/ssl_lib.c
index 8dddee1bc8..a7d4dd191d 100644
--- a/ssl/ssl_lib.c
+++ b/ssl/ssl_lib.c
@@ -320,7 +320,7 @@ static const EVP_MD *tlsa_md_get(SSL_DANE *dane, uint8_t mtype)
 static int dane_tlsa_add(SSL_DANE *dane,
                          uint8_t usage,
                          uint8_t selector,
-                         uint8_t mtype, unsigned char *data, size_t dlen)
+                         uint8_t mtype, unsigned const char *data, size_t dlen)
 {
     danetls_record *t;
     const EVP_MD *md = NULL;
@@ -1076,7 +1076,7 @@ SSL_DANE *SSL_get0_dane(SSL *s)
 }
 
 int SSL_dane_tlsa_add(SSL *s, uint8_t usage, uint8_t selector,
-                      uint8_t mtype, unsigned char *data, size_t dlen)
+                      uint8_t mtype, unsigned const char *data, size_t dlen)
 {
     return dane_tlsa_add(&s->dane, usage, selector, mtype, data, dlen);
 }