encode newlines in HTTP headers (fixes #1106)

git-svn-id: svn://svn.lighttpd.net/lighttpd/branches/lighttpd-1.4.x@1723 152afb58-edef-0310-8abb-c4023f1b3aa9

src/buffer.c

@@ -729,6 +729,29 @@ const char encoded_chars_hex[] = {
 	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,  /*  F0 -  FF */
 };
 
+const char encoded_chars_http_header[] = {
+	/*
+	0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F
+	*/
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0,  /*  00 -  0F */
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /*  10 -  1F */
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /*  20 -  2F */
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /*  30 -  3F */
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /*  40 -  4F */
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /*  50 -  5F */
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /*  60 -  6F */
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /*  70 -  7F */
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /*  80 -  8F */
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /*  90 -  9F */
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /*  A0 -  AF */
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /*  B0 -  BF */
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /*  C0 -  CF */
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /*  D0 -  DF */
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /*  E0 -  EF */
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /*  F0 -  FF */
+};
+
+
 
 int buffer_append_string_encoded(buffer *b, const char *s, size_t s_len, buffer_encoding_t encoding) {
 	unsigned char *ds, *d;
@@ -759,6 +782,9 @@ int buffer_append_string_encoded(buffer *b, const char *s, size_t s_len, buffer_
 	case ENCODING_HEX:
 		map = encoded_chars_hex;
 		break;
+	case ENCODING_HTTP_HEADER:
+		map = encoded_chars_http_header;
+		break;
 	case ENCODING_UNSET:
 		break;
 	}
@@ -777,6 +803,7 @@ int buffer_append_string_encoded(buffer *b, const char *s, size_t s_len, buffer_
 			case ENCODING_MINIMAL_XML:
 				d_len += 6;
 				break;
+			case ENCODING_HTTP_HEADER:
 			case ENCODING_HEX:
 				d_len += 2;
 				break;
@@ -812,6 +839,10 @@ int buffer_append_string_encoded(buffer *b, const char *s, size_t s_len, buffer_
 				d[d_len++] = hex_chars[((*ds) >> 4) & 0x0F];
 				d[d_len++] = hex_chars[(*ds) & 0x0F];
 				break;
+			case ENCODING_HTTP_HEADER:
+				d[d_len++] = *ds;
+				d[d_len++] = '\t';
+				break;
 			case ENCODING_UNSET:
 				break;
 			}

src/buffer.h

@@ -87,9 +87,10 @@ typedef enum {
 	ENCODING_UNSET,
 	ENCODING_REL_URI, /* for coding a rel-uri (/with space/and%percent) nicely as part of a href */
 	ENCODING_REL_URI_PART, /* same as ENC_REL_URL plus coding / too as %2F */
-	ENCODING_HTML,    /* & becomes & and so on */
-	ENCODING_MINIMAL_XML, /* minimal encoding for xml */
-	ENCODING_HEX      /* encode string as hex */
+	ENCODING_HTML,         /* & becomes & and so on */
+	ENCODING_MINIMAL_XML,  /* minimal encoding for xml */
+	ENCODING_HEX,          /* encode string as hex */
+	ENCODING_HTTP_HEADER   /* encode \n with \t\n */
 } buffer_encoding_t;
 
 int buffer_append_string_encoded(buffer *b, const char *s, size_t s_len, buffer_encoding_t encoding);

src/response.c

@@ -66,7 +66,11 @@ int http_response_write_header(server *srv, connection *con) {
 			BUFFER_APPEND_STRING_CONST(b, "\r\n");
 			buffer_append_string_buffer(b, ds->key);
 			BUFFER_APPEND_STRING_CONST(b, ": ");
-			buffer_append_string_buffer(b, ds->value);
+
+			/** 
+			 * the value might contain newlines, encode them with at least one white-space
+			 */
+			buffer_append_string_encoded(b, CONST_BUF_LEN(ds->value), ENCODING_HTTP_HEADER);
 #if 0
 			log_error_write(srv, __FILE__, __LINE__, "bb",
 					ds->key, ds->value);
@@ -98,7 +102,7 @@ int http_response_write_header(server *srv, connection *con) {
 			BUFFER_APPEND_STRING_CONST(b, "\r\nServer: " PACKAGE_NAME "/" PACKAGE_VERSION);
 		} else {
 			BUFFER_APPEND_STRING_CONST(b, "\r\nServer: ");
-			buffer_append_string_buffer(b, con->conf.server_tag);
+			buffer_append_string_encoded(b, CONST_BUF_LEN(con->conf.server_tag), ENCODING_HTTP_HEADER);
 		}
 	}