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[tls] Concatenate received non-data records before processing

Allow non-data records to be split across multiple received I/O
buffers, to accommodate large certificate chains.

Reported-by: Nicola Volpini <Nicola.Volpini@kambi.com>
Tested-by: Nicola Volpini <Nicola.Volpini@kambi.com>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
tags/v1.20.1
Michael Brown 11 vuotta sitten
vanhempi
commit
0acc52519d
3 muutettua tiedostoa jossa 53 lisäystä ja 12 poistoa
  1. 42
    0
      src/core/iobuf.c
  2. 1
    0
      src/include/ipxe/iobuf.h
  3. 10
    12
      src/net/tls.c

+ 42
- 0
src/core/iobuf.c Näytä tiedosto

@@ -158,3 +158,45 @@ int iob_ensure_headroom ( struct io_buffer *iobuf, size_t len ) {
158 158
 	return -ENOBUFS;
159 159
 }
160 160
 
161
+/**
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+ * Concatenate I/O buffers into a single buffer
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+ *
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+ * @v list	List of I/O buffers
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+ * @ret iobuf	Concatenated I/O buffer, or NULL on allocation failure
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+ *
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+ * After a successful concatenation, the list will be empty.
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+ */
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+struct io_buffer * iob_concatenate ( struct list_head *list ) {
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+	struct io_buffer *iobuf;
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+	struct io_buffer *tmp;
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+	struct io_buffer *concatenated;
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+	size_t len = 0;
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+
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+	/* If the list contains only a single entry, avoid an
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+	 * unnecessary additional allocation.
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+	 */
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+	if ( list_is_singular ( list ) ) {
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+		iobuf = list_first_entry ( list, struct io_buffer, list );
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+		INIT_LIST_HEAD ( list );
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+		return iobuf;
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+	}
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+
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+	/* Calculate total length */
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+	list_for_each_entry ( iobuf, list, list )
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+		len += iob_len ( iobuf );
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+
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+	/* Allocate new I/O buffer */
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+	concatenated = alloc_iob_raw ( len, __alignof__ ( *iobuf ), 0 );
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+	if ( ! concatenated )
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+		return NULL;
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+
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+	/* Move data to new I/O buffer */
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+	list_for_each_entry_safe ( iobuf, tmp, list, list ) {
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+		list_del ( &iobuf->list );
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+		memcpy ( iob_put ( concatenated, iob_len ( iobuf ) ),
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+			 iobuf->data, iob_len ( iobuf ) );
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+		free_iob ( iobuf );
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+	}
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+
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+	return concatenated;
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+}

+ 1
- 0
src/include/ipxe/iobuf.h Näytä tiedosto

@@ -216,5 +216,6 @@ extern struct io_buffer * __malloc alloc_iob ( size_t len );
216 216
 extern void free_iob ( struct io_buffer *iobuf );
217 217
 extern void iob_pad ( struct io_buffer *iobuf, size_t min_len );
218 218
 extern int iob_ensure_headroom ( struct io_buffer *iobuf, size_t len );
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+extern struct io_buffer * iob_concatenate ( struct list_head *list );
219 220
 
220 221
 #endif /* _IPXE_IOBUF_H */

+ 10
- 12
src/net/tls.c Näytä tiedosto

@@ -105,10 +105,6 @@ FILE_LICENCE ( GPL2_OR_LATER );
105 105
 #define EINFO_EINVAL_MAC						\
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 	__einfo_uniqify ( EINFO_EINVAL, 0x0d,				\
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 			  "Invalid MAC" )
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-#define EINVAL_NON_DATA __einfo_error ( EINFO_EINVAL_NON_DATA )
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-#define EINFO_EINVAL_NON_DATA						\
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-	__einfo_uniqify ( EINFO_EINVAL, 0x0e,				\
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-			  "Overlength non-data record" )
112 108
 #define EIO_ALERT __einfo_error ( EINFO_EIO_ALERT )
113 109
 #define EINFO_EIO_ALERT							\
114 110
 	__einfo_uniqify ( EINFO_EINVAL, 0x01,				\
@@ -137,6 +133,10 @@ FILE_LICENCE ( GPL2_OR_LATER );
137 133
 #define EINFO_ENOMEM_RX_DATA						\
138 134
 	__einfo_uniqify ( EINFO_ENOMEM, 0x07,				\
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 			  "Not enough space for received data" )
136
+#define ENOMEM_RX_CONCAT __einfo_error ( EINFO_ENOMEM_RX_CONCAT )
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+#define EINFO_ENOMEM_RX_CONCAT						\
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+	__einfo_uniqify ( EINFO_ENOMEM, 0x08,				\
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+			  "Not enough space to concatenate received data" )
140 140
 #define ENOTSUP_CIPHER __einfo_error ( EINFO_ENOTSUP_CIPHER )
141 141
 #define EINFO_ENOTSUP_CIPHER						\
142 142
 	__einfo_uniqify ( EINFO_ENOTSUP, 0x01,				\
@@ -1743,14 +1743,12 @@ static int tls_new_record ( struct tls_session *tls, unsigned int type,
1743 1743
 		return 0;
1744 1744
 	}
1745 1745
 
1746
-	/* For all other records, fail unless we have exactly one I/O buffer */
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-	iobuf = list_first_entry ( rx_data, struct io_buffer, list );
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-	assert ( iobuf != NULL );
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-	list_del ( &iobuf->list );
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-	if ( ! list_empty ( rx_data ) ) {
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-		DBGC ( tls, "TLS %p overlength non-data record\n", tls );
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-		free_iob ( iobuf );
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-		return -EINVAL_NON_DATA;
1746
+	/* For all other records, merge into a single I/O buffer */
1747
+	iobuf = iob_concatenate ( rx_data );
1748
+	if ( ! iobuf ) {
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+		DBGC ( tls, "TLS %p could not concatenate non-data record "
1750
+		       "type %d\n", tls, type );
1751
+		return -ENOMEM_RX_CONCAT;
1754 1752
 	}
1755 1753
 
1756 1754
 	/* Determine handler */

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