Require ServerInfo PEMs to be named "BEGIN SERVERINFO FOR"...

diff --git a/ssl/ssl_rsa.c b/ssl/ssl_rsa.c
index b6765a3..36d7a1a 100644
--- a/ssl/ssl_rsa.c
+++ b/ssl/ssl_rsa.c

@@ -982,6 +982,7 @@
 	long extension_length = 0;
 	char* name = NULL;
 	char* header = NULL;
+	char namePrefix[] = "SERVERINFO FOR ";
 	int ret = 0;
 	BIO *bin = NULL;
 	size_t num_extensions = 0;
@@ -1017,11 +1018,22 @@
 			else /* End of file, we're done */
 				break;
 			}
+		/* Check that PEM name starts with "BEGIN SERVERINFO FOR " */
+		if (strlen(name) < strlen(namePrefix))
+			{
+			SSLerr(SSL_F_SSL_CTX_USE_SERVERINFO_FILE, ERR_R_PEM_LIB);
+			goto end;
+			}
+		if (strncmp(name, namePrefix, strlen(namePrefix)) != 0)
+			{
+			SSLerr(SSL_F_SSL_CTX_USE_SERVERINFO_FILE, ERR_R_PEM_LIB);
+			goto end;
+			}
 		/* Check that the decoded PEM data is plausible (valid length field) */
 		if (extension_length < 4 || (extension[2] << 8) + extension[3] != extension_length - 4)
 			{
-				SSLerr(SSL_F_SSL_CTX_USE_SERVERINFO_FILE, ERR_R_PEM_LIB);
-				goto end;
+			SSLerr(SSL_F_SSL_CTX_USE_SERVERINFO_FILE, ERR_R_PEM_LIB);
+			goto end;
 			}
 		/* Append the decoded extension to the serverinfo buffer */
 		serverinfo = OPENSSL_realloc(serverinfo, serverinfo_length + extension_length);

diff --git a/test/serverinfo.pem b/test/serverinfo.pem
index 0eb020a..cd3020e 100644
--- a/test/serverinfo.pem
+++ b/test/serverinfo.pem

@@ -1,10 +1,10 @@
------BEGIN SCT-----
+-----BEGIN SERVERINFO FOR CT-----
 ABIAZMevsj4TC5rgwjZNciLGwh15YXoIK9t5aypGJIG4QzyMowmwwDdqxudkUcGa
 DvuqlYL7psO5j4/BIHTe677CAZBBH3Ho2NOM5q1zub4AbfUMlKeufuQgeQ2Tj1oe
 LJLRzrwDnPs=
------END SCT-----
+-----END SERVERINFO FOR CT-----
 
------BEGIN TACK EXTENSION-----
+-----BEGIN SERVERINFO FOR TACK-----
 8wABTwFMh1Dz+3W6zULWJKjav5TNaFEXL1h98YtCXeyZnORYg4mbKpxH5CMbjpgx
 To3amSqUPF4Ntjc/i9+poutxebYkbgAAAkMcxb8+RaM9YEywaJEGViKJJmpYG/gJ
 HgfGaefI9kKbXSDmP9ntg8dLvDzuyYw14ktM2850Q9WvBiltpekilZxVuT2bFtfs
@@ -13,4 +13,4 @@
 xXQJPbdniI9rEydVXb1Cu1yT/t7FBEx6hLxuoypXjCI1wCGpXsd8zEnloR0Ank5h
 VO/874E/BZlItzSPpcmDKl5Def6BrAJTErQlE9npo52S05YWORxJw1+VYBdqQ09A
 x3wA
------END TACK EXTENSION-----
+-----END SERVERINFO FOR TACK-----