Adding upstream version 2.6.12.upstream/2.6.12upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 563 insertions, 0 deletions

diff --git a/src/qpack-dec.c b/src/qpack-dec.c
new file mode 100644
index 0000000..a6e2923
--- /dev/null
+++ b/src/qpack-dec.c
@@ -0,0 +1,563 @@
+/*
+ * QPACK decompressor
+ *
+ * Copyright 2021 HAProxy Technologies, Frederic Lecaille <flecaille@haproxy.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation, version 2.1
+ * exclusively.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <import/ist.h>
+#include <haproxy/buf.h>
+#include <haproxy/chunk.h>
+#include <haproxy/h3.h>
+#include <haproxy/mux_quic.h>
+#include <haproxy/qpack-t.h>
+#include <haproxy/qpack-dec.h>
+#include <haproxy/qpack-tbl.h>
+#include <haproxy/hpack-huff.h>
+#include <haproxy/hpack-tbl.h>
+#include <haproxy/http-hdr.h>
+#include <haproxy/tools.h>
+
+#if defined(DEBUG_QPACK)
+#define qpack_debug_printf fprintf
+#define qpack_debug_hexdump debug_hexdump
+#else
+#define qpack_debug_printf(...) do { } while (0)
+#define qpack_debug_hexdump(...) do { } while (0)
+#endif
+
+/* Encoded field line bitmask */
+#define QPACK_EFL_BITMASK  0xf0
+#define QPACK_LFL_WPBNM    0x00 // Literal field line with post-base name reference
+#define QPACK_IFL_WPBI     0x10 // Indexed field line with post-based index
+#define QPACK_LFL_WLN_BIT  0x20 // Literal field line with literal name
+#define QPACK_LFL_WNR_BIT  0x40 // Literal field line with name reference
+#define QPACK_IFL_BIT      0x80 // Indexed field line
+
+/* reads a varint from <raw>'s lowest <b> bits and <len> bytes max (raw included).
+ * returns the 64-bit value on success after updating buf and len_in. Forces
+ * len_in to (uint64_t)-1 on truncated input.
+ * Note that this function is similar to the one used for HPACK (except that is supports
+ * up to 62-bits integers).
+ */
+static uint64_t qpack_get_varint(const unsigned char **buf, uint64_t *len_in, int b)
+{
+	uint64_t ret = 0;
+	int len = *len_in;
+	const uint8_t *raw = *buf;
+	uint8_t shift = 0;
+
+	len--;
+	ret = *raw++ & ((1ULL << b) - 1);
+	if (ret != (uint64_t)((1ULL << b) - 1))
+		goto end;
+
+	while (len && (*raw & 128)) {
+		ret += ((uint64_t)*raw++ & 127) << shift;
+		shift += 7;
+		len--;
+	}
+
+	/* last 7 bits */
+	if (!len)
+		goto too_short;
+
+	len--;
+	ret += ((uint64_t)*raw++ & 127) << shift;
+
+ end:
+	*buf = raw;
+	*len_in = len;
+	return ret;
+
+ too_short:
+	*len_in = (uint64_t)-1;
+	return 0;
+}
+
+/* Decode an encoder stream.
+ *
+ * Returns 0 on success else non-zero.
+ */
+int qpack_decode_enc(struct buffer *buf, int fin, void *ctx)
+{
+	struct qcs *qcs = ctx;
+	size_t len;
+	unsigned char inst;
+
+	/* RFC 9204 4.2. Encoder and Decoder Streams
+	 *
+	 * The sender MUST NOT close either of these streams, and the receiver
+	 * MUST NOT request that the sender close either of these streams.
+	 * Closure of either unidirectional stream type MUST be treated as a
+	 * connection error of type H3_CLOSED_CRITICAL_STREAM.
+	 */
+	if (fin) {
+		qcc_emit_cc_app(qcs->qcc, H3_CLOSED_CRITICAL_STREAM, 1);
+		return -1;
+	}
+
+	len = b_data(buf);
+	qpack_debug_hexdump(stderr, "[QPACK-DEC-ENC] ", b_head(buf), 0, len);
+
+	if (!len) {
+		qpack_debug_printf(stderr, "[QPACK-DEC-ENC] empty stream\n");
+		return 0;
+	}
+
+	inst = (unsigned char)*b_head(buf) & QPACK_ENC_INST_BITMASK;
+	if (inst == QPACK_ENC_INST_DUP) {
+		/* Duplicate */
+	}
+	else if (inst & QPACK_ENC_INST_IWNR_BIT) {
+		/* Insert With Name Reference */
+	}
+	else if (inst & QPACK_ENC_INST_IWLN_BIT) {
+		/* Insert with literal name */
+	}
+	else if (inst & QPACK_ENC_INST_SDTC_BIT) {
+		/* Set dynamic table capacity */
+	}
+
+	return 0;
+}
+
+/* Decode an decoder stream.
+ *
+ * Returns 0 on success else non-zero.
+ */
+int qpack_decode_dec(struct buffer *buf, int fin, void *ctx)
+{
+	struct qcs *qcs = ctx;
+	size_t len;
+	unsigned char inst;
+
+	/* RFC 9204 4.2. Encoder and Decoder Streams
+	 *
+	 * The sender MUST NOT close either of these streams, and the receiver
+	 * MUST NOT request that the sender close either of these streams.
+	 * Closure of either unidirectional stream type MUST be treated as a
+	 * connection error of type H3_CLOSED_CRITICAL_STREAM.
+	 */
+	if (fin) {
+		qcc_emit_cc_app(qcs->qcc, H3_CLOSED_CRITICAL_STREAM, 1);
+		return -1;
+	}
+
+	len = b_data(buf);
+	qpack_debug_hexdump(stderr, "[QPACK-DEC-DEC] ", b_head(buf), 0, len);
+
+	if (!len) {
+		qpack_debug_printf(stderr, "[QPACK-DEC-DEC] empty stream\n");
+		return 0;
+	}
+
+	inst = (unsigned char)*b_head(buf) & QPACK_DEC_INST_BITMASK;
+	if (inst == QPACK_DEC_INST_ICINC) {
+		/* Insert count increment */
+	}
+	else if (inst & QPACK_DEC_INST_SACK) {
+		/* Section Acknowledgment */
+	}
+	else if (inst & QPACK_DEC_INST_SCCL) {
+		/* Stream cancellation */
+	}
+
+	return 0;
+}
+
+/* Decode a field section prefix made of <enc_ric> and <db> two varints.
+ * Also set the 'S' sign bit for <db>.
+ * Return a negative error if failed, 0 if not.
+ */
+static int qpack_decode_fs_pfx(uint64_t *enc_ric, uint64_t *db, int *sign_bit,
+                               const unsigned char **raw, uint64_t *len)
+{
+	*enc_ric = qpack_get_varint(raw, len, 8);
+	if (*len == (uint64_t)-1)
+		return -QPACK_ERR_RIC;
+
+	*sign_bit = **raw & 0x8;
+	*db = qpack_get_varint(raw, len, 7);
+	if (*len == (uint64_t)-1)
+		return -QPACK_ERR_DB;
+
+	return 0;
+}
+
+/* Decode a field section from the <raw> buffer of <len> bytes. Each parsed
+ * header is inserted into <list> of <list_size> entries max and uses <tmp> as
+ * a storage for some elements pointing into it. An end marker is inserted at
+ * the end of the list with empty strings as name/value.
+ *
+ * Returns the number of headers inserted into list excluding the end marker.
+ * In case of error, a negative code QPACK_ERR_* is returned.
+ */
+int qpack_decode_fs(const unsigned char *raw, uint64_t len, struct buffer *tmp,
+                    struct http_hdr *list, int list_size)
+{
+	struct ist name, value;
+	uint64_t enc_ric, db;
+	int s;
+	unsigned int efl_type;
+	int ret;
+	int hdr_idx = 0;
+
+	qpack_debug_hexdump(stderr, "[QPACK-DEC-FS] ", (const char *)raw, 0, len);
+
+	/* parse field section prefix */
+	ret = qpack_decode_fs_pfx(&enc_ric, &db, &s, &raw, &len);
+	if (ret < 0) {
+		qpack_debug_printf(stderr, "##ERR@%d(%d)\n", __LINE__, ret);
+		goto out;
+	}
+
+	chunk_reset(tmp);
+	qpack_debug_printf(stderr, "enc_ric: %llu db: %llu s=%d\n", 
+	                   (unsigned long long)enc_ric, (unsigned long long)db, !!s);
+	/* Decode field lines */
+	while (len) {
+		if (hdr_idx >= list_size) {
+			qpack_debug_printf(stderr, "##ERR@%d\n", __LINE__);
+			ret = -QPACK_ERR_TOO_LARGE;
+			goto out;
+		}
+
+		/* parse field line representation */
+		efl_type = *raw & QPACK_EFL_BITMASK;
+		qpack_debug_printf(stderr, "efl_type=0x%02x\n", efl_type);
+
+		if (efl_type == QPACK_LFL_WPBNM) {
+			/* Literal field line with post-base name reference
+			 * TODO adjust this when dynamic table support is implemented.
+			 */
+#if 0
+			uint64_t index __maybe_unused, length;
+			unsigned int n __maybe_unused, h __maybe_unused;
+
+			qpack_debug_printf(stderr, "literal field line with post-base name reference:");
+			n = *raw & 0x08;
+			index = qpack_get_varint(&raw, &len, 3);
+			if (len == (uint64_t)-1) {
+				qpack_debug_printf(stderr, "##ERR@%d\n", __LINE__);
+				ret = -QPACK_ERR_TRUNCATED;
+				goto out;
+			}
+
+			qpack_debug_printf(stderr, " n=%d index=%llu", !!n, (unsigned long long)index);
+			h = *raw & 0x80;
+			length = qpack_get_varint(&raw, &len, 7);
+			if (len == (uint64_t)-1) {
+				qpack_debug_printf(stderr, "##ERR@%d\n", __LINE__);
+				ret = -QPACK_ERR_TRUNCATED;
+				goto out;
+			}
+
+			qpack_debug_printf(stderr, " h=%d length=%llu", !!h, (unsigned long long)length);
+
+			if (len < length) {
+				qpack_debug_printf(stderr, "##ERR@%d\n", __LINE__);
+				ret = -QPACK_ERR_TRUNCATED;
+				goto out;
+			}
+
+			raw += length;
+			len -= length;
+#endif
+
+			/* RFC9204 2.2.3 Invalid References
+			 *
+			 * If the decoder encounters a reference in a field line representation
+			 * to a dynamic table entry that has already been evicted or that has an
+			 * absolute index greater than or equal to the declared Required Insert
+			 * Count (Section 4.5.1), it MUST treat this as a connection error of
+			 * type QPACK_DECOMPRESSION_FAILED.
+			 */
+			return -QPACK_DECOMPRESSION_FAILED;
+		}
+		else if (efl_type == QPACK_IFL_WPBI) {
+			/* Indexed field line with post-base index
+			 * TODO adjust this when dynamic table support is implemented.
+			 */
+#if 0
+			uint64_t index __maybe_unused;
+
+			qpack_debug_printf(stderr, "indexed field line with post-base index:");
+			index = qpack_get_varint(&raw, &len, 4);
+			if (len == (uint64_t)-1) {
+				qpack_debug_printf(stderr, "##ERR@%d\n", __LINE__);
+				ret = -QPACK_ERR_TRUNCATED;
+				goto out;
+			}
+
+			qpack_debug_printf(stderr, " index=%llu", (unsigned long long)index);
+#endif
+
+			/* RFC9204 2.2.3 Invalid References
+			 *
+			 * If the decoder encounters a reference in a field line representation
+			 * to a dynamic table entry that has already been evicted or that has an
+			 * absolute index greater than or equal to the declared Required Insert
+			 * Count (Section 4.5.1), it MUST treat this as a connection error of
+			 * type QPACK_DECOMPRESSION_FAILED.
+			 */
+			return -QPACK_DECOMPRESSION_FAILED;
+		}
+		else if (efl_type & QPACK_IFL_BIT) {
+			/* Indexed field line */
+			uint64_t index;
+			unsigned int static_tbl;
+
+			qpack_debug_printf(stderr, "indexed field line:");
+			static_tbl = efl_type & 0x40;
+			index = qpack_get_varint(&raw, &len, 6);
+			if (len == (uint64_t)-1) {
+				qpack_debug_printf(stderr, "##ERR@%d\n", __LINE__);
+				ret = -QPACK_ERR_TRUNCATED;
+				goto out;
+			}
+
+			if (static_tbl && index < QPACK_SHT_SIZE) {
+				name = qpack_sht[index].n;
+				value = qpack_sht[index].v;
+			}
+			else {
+				/* RFC9204 2.2.3 Invalid References
+				 *
+				 * If the decoder encounters a reference in a field line representation
+				 * to a dynamic table entry that has already been evicted or that has an
+				 * absolute index greater than or equal to the declared Required Insert
+				 * Count (Section 4.5.1), it MUST treat this as a connection error of
+				 * type QPACK_DECOMPRESSION_FAILED.
+				 *
+				 * TODO adjust this when dynamic table support is implemented.
+				 */
+				return -QPACK_DECOMPRESSION_FAILED;
+			}
+
+			qpack_debug_printf(stderr,  " t=%d index=%llu", !!static_tbl, (unsigned long long)index);
+		}
+		else if (efl_type & QPACK_LFL_WNR_BIT) {
+			/* Literal field line with name reference */
+			uint64_t index, length;
+			unsigned int static_tbl, n __maybe_unused, h;
+
+			qpack_debug_printf(stderr, "Literal field line with name reference:");
+			n = efl_type & 0x20;
+			static_tbl = efl_type & 0x10;
+			index = qpack_get_varint(&raw, &len, 4);
+			if (len == (uint64_t)-1) {
+				qpack_debug_printf(stderr, "##ERR@%d\n", __LINE__);
+				ret = -QPACK_ERR_TRUNCATED;
+				goto out;
+			}
+
+			if (static_tbl && index < QPACK_SHT_SIZE) {
+				name = qpack_sht[index].n;
+			}
+			else {
+				/* RFC9204 2.2.3 Invalid References
+				 *
+				 * If the decoder encounters a reference in a field line representation
+				 * to a dynamic table entry that has already been evicted or that has an
+				 * absolute index greater than or equal to the declared Required Insert
+				 * Count (Section 4.5.1), it MUST treat this as a connection error of
+				 * type QPACK_DECOMPRESSION_FAILED.
+				 *
+				 * TODO adjust this when dynamic table support is implemented.
+				 */
+				return -QPACK_DECOMPRESSION_FAILED;
+			}
+
+			qpack_debug_printf(stderr, " n=%d t=%d index=%llu", !!n, !!static_tbl, (unsigned long long)index);
+			h = *raw & 0x80;
+			length = qpack_get_varint(&raw, &len, 7);
+			if (len == (uint64_t)-1) {
+				qpack_debug_printf(stderr, "##ERR@%d\n", __LINE__);
+				ret = -QPACK_ERR_TRUNCATED;
+				goto out;
+			}
+
+			qpack_debug_printf(stderr, " h=%d length=%llu", !!h, (unsigned long long)length);
+			if (h) {
+				char *trash;
+				int nlen;
+
+				trash = chunk_newstr(tmp);
+				if (!trash) {
+					qpack_debug_printf(stderr, "##ERR@%d\n", __LINE__);
+					ret = -QPACK_DECOMPRESSION_FAILED;
+					goto out;
+				}
+				nlen = huff_dec(raw, length, trash, tmp->size - tmp->data);
+				if (nlen == (uint32_t)-1) {
+					qpack_debug_printf(stderr, " can't decode huffman.\n");
+					ret = -QPACK_ERR_HUFFMAN;
+					goto out;
+				}
+
+				qpack_debug_printf(stderr, " [name huff %d->%d '%s']", (int)length, (int)nlen, trash);
+				/* makes an ist from tmp storage */
+				b_add(tmp, nlen);
+				value = ist2(trash, nlen);
+			}
+			else {
+				value = ist2(raw, length);
+			}
+
+			if (len < length) {
+				qpack_debug_printf(stderr, "##ERR@%d\n", __LINE__);
+				ret = -QPACK_ERR_TRUNCATED;
+				goto out;
+			}
+
+			raw += length;
+			len -= length;
+		}
+		else if (efl_type & QPACK_LFL_WLN_BIT) {
+			/* Literal field line with literal name */
+			unsigned int n __maybe_unused, hname, hvalue;
+			uint64_t name_len, value_len;
+
+			qpack_debug_printf(stderr, "Literal field line with literal name:");
+			n = *raw & 0x10;
+			hname = *raw & 0x08;
+			name_len = qpack_get_varint(&raw, &len, 3);
+			if (len == (uint64_t)-1) {
+				qpack_debug_printf(stderr, "##ERR@%d\n", __LINE__);
+				ret = -QPACK_ERR_TRUNCATED;
+				goto out;
+			}
+
+			qpack_debug_printf(stderr, " n=%d hname=%d name_len=%llu", !!n, !!hname, (unsigned long long)name_len);
+			/* Name string */
+
+			if (len < name_len) {
+				qpack_debug_printf(stderr, "##ERR@%d\n", __LINE__);
+				ret = -QPACK_ERR_TRUNCATED;
+				goto out;
+			}
+
+			if (hname) {
+				char *trash;
+				int nlen;
+
+				trash = chunk_newstr(tmp);
+				if (!trash) {
+					qpack_debug_printf(stderr, "##ERR@%d\n", __LINE__);
+					ret = -QPACK_DECOMPRESSION_FAILED;
+					goto out;
+				}
+				nlen = huff_dec(raw, name_len, trash, tmp->size - tmp->data);
+				if (nlen == (uint32_t)-1) {
+					qpack_debug_printf(stderr, " can't decode huffman.\n");
+					ret = -QPACK_ERR_HUFFMAN;
+					goto out;
+				}
+
+				qpack_debug_printf(stderr, " [name huff %d->%d '%s']", (int)name_len, (int)nlen, trash);
+				/* makes an ist from tmp storage */
+				b_add(tmp, nlen);
+				name = ist2(trash, nlen);
+			}
+			else {
+				name = ist2(raw, name_len);
+			}
+
+			raw += name_len;
+			len -= name_len;
+
+			hvalue = *raw & 0x80;
+			value_len = qpack_get_varint(&raw, &len, 7);
+			if (len == (uint64_t)-1) {
+				qpack_debug_printf(stderr, "##ERR@%d\n", __LINE__);
+				ret = -QPACK_ERR_TRUNCATED;
+				goto out;
+			}
+
+			qpack_debug_printf(stderr, " hvalue=%d value_len=%llu", !!hvalue, (unsigned long long)value_len);
+
+			if (len < value_len) {
+				qpack_debug_printf(stderr, "##ERR@%d\n", __LINE__);
+				ret = -QPACK_ERR_TRUNCATED;
+				goto out;
+			}
+
+			if (hvalue) {
+				char *trash;
+				int nlen;
+
+				trash = chunk_newstr(tmp);
+				if (!trash) {
+					qpack_debug_printf(stderr, "##ERR@%d\n", __LINE__);
+					ret = -QPACK_DECOMPRESSION_FAILED;
+					goto out;
+				}
+				nlen = huff_dec(raw, value_len, trash, tmp->size - tmp->data);
+				if (nlen == (uint32_t)-1) {
+					qpack_debug_printf(stderr, " can't decode huffman.\n");
+					ret = -QPACK_ERR_HUFFMAN;
+					goto out;
+				}
+
+				qpack_debug_printf(stderr, " [name huff %d->%d '%s']", (int)value_len, (int)nlen, trash);
+				/* makes an ist from tmp storage */
+				b_add(tmp, nlen);
+				value = ist2(trash, nlen);
+			}
+			else {
+				value = ist2(raw, value_len);
+			}
+
+			raw += value_len;
+			len -= value_len;
+		}
+
+		/* We must not accept empty header names (forbidden by the spec and used
+		 * as a list termination).
+		 */
+		if (!name.len) {
+			qpack_debug_printf(stderr, "##ERR@%d\n", __LINE__);
+			ret = -QPACK_DECOMPRESSION_FAILED;
+			goto out;
+		}
+
+		list[hdr_idx].n = name;
+		list[hdr_idx].v = value;
+		++hdr_idx;
+
+		qpack_debug_printf(stderr, "\n");
+	}
+
+	if (hdr_idx >= list_size) {
+		qpack_debug_printf(stderr, "##ERR@%d\n", __LINE__);
+		ret = -QPACK_ERR_TOO_LARGE;
+		goto out;
+	}
+
+	/* put an end marker */
+	list[hdr_idx].n = list[hdr_idx].v = IST_NULL;
+	ret = hdr_idx;
+
+ out:
+	qpack_debug_printf(stderr, "-- done: ret=%d\n", ret);
+	return ret;
+}