520 lines
18 KiB
C
520 lines
18 KiB
C
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/* $OpenBSD: bytestring.h,v 1.17 2018/08/16 18:39:37 jsing Exp $ */
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/*
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* Copyright (c) 2014, Google Inc.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
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#ifndef OPENSSL_HEADER_BYTESTRING_H
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#define OPENSSL_HEADER_BYTESTRING_H
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#include <sys/types.h>
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#include <stdint.h>
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#include <openssl/opensslconf.h>
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__BEGIN_HIDDEN_DECLS
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/*
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* Bytestrings are used for parsing and building TLS and ASN.1 messages.
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*
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* A "CBS" (CRYPTO ByteString) represents a string of bytes in memory and
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* provides utility functions for safely parsing length-prefixed structures
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* like TLS and ASN.1 from it.
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*
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* A "CBB" (CRYPTO ByteBuilder) is a memory buffer that grows as needed and
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* provides utility functions for building length-prefixed messages.
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*/
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/* CRYPTO ByteString */
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typedef struct cbs_st {
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const uint8_t *data;
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size_t initial_len;
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size_t len;
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} CBS;
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/*
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* CBS_init sets |cbs| to point to |data|. It does not take ownership of
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* |data|.
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*/
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void CBS_init(CBS *cbs, const uint8_t *data, size_t len);
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/*
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* CBS_skip advances |cbs| by |len| bytes. It returns one on success and zero
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* otherwise.
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*/
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int CBS_skip(CBS *cbs, size_t len);
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/*
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* CBS_data returns a pointer to the contents of |cbs|.
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*/
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const uint8_t *CBS_data(const CBS *cbs);
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/*
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* CBS_len returns the number of bytes remaining in |cbs|.
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*/
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size_t CBS_len(const CBS *cbs);
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/*
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* CBS_offset returns the current offset into the original data of |cbs|.
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*/
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size_t CBS_offset(const CBS *cbs);
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/*
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* CBS_stow copies the current contents of |cbs| into |*out_ptr| and
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* |*out_len|. If |*out_ptr| is not NULL, the contents are freed with
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* free. It returns one on success and zero on allocation failure. On
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* success, |*out_ptr| should be freed with free. If |cbs| is empty,
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* |*out_ptr| will be NULL.
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*/
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int CBS_stow(const CBS *cbs, uint8_t **out_ptr, size_t *out_len);
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/*
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* CBS_strdup copies the current contents of |cbs| into |*out_ptr| as a
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* NUL-terminated C string. If |*out_ptr| is not NULL, the contents are freed
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* with free. It returns one on success and zero on allocation
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* failure. On success, |*out_ptr| should be freed with free.
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*
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* NOTE: If |cbs| contains NUL bytes, the string will be truncated. Call
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* |CBS_contains_zero_byte(cbs)| to check for NUL bytes.
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*/
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int CBS_strdup(const CBS *cbs, char **out_ptr);
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/*
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* CBS_write_bytes writes all of the remaining data from |cbs| into |dst|
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* if it is at most |dst_len| bytes. If |copied| is not NULL, it will be set
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* to the amount copied. It returns one on success and zero otherwise.
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*/
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int CBS_write_bytes(const CBS *cbs, uint8_t *dst, size_t dst_len,
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size_t *copied);
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/*
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* CBS_contains_zero_byte returns one if the current contents of |cbs| contains
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* a NUL byte and zero otherwise.
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*/
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int CBS_contains_zero_byte(const CBS *cbs);
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/*
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* CBS_mem_equal compares the current contents of |cbs| with the |len| bytes
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* starting at |data|. If they're equal, it returns one, otherwise zero. If the
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* lengths match, it uses a constant-time comparison.
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*/
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int CBS_mem_equal(const CBS *cbs, const uint8_t *data, size_t len);
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/*
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* CBS_get_u8 sets |*out| to the next uint8_t from |cbs| and advances |cbs|. It
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* returns one on success and zero on error.
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*/
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int CBS_get_u8(CBS *cbs, uint8_t *out);
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/*
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* CBS_get_u16 sets |*out| to the next, big-endian uint16_t from |cbs| and
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* advances |cbs|. It returns one on success and zero on error.
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*/
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int CBS_get_u16(CBS *cbs, uint16_t *out);
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/*
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* CBS_get_u24 sets |*out| to the next, big-endian 24-bit value from |cbs| and
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* advances |cbs|. It returns one on success and zero on error.
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*/
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int CBS_get_u24(CBS *cbs, uint32_t *out);
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/*
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* CBS_get_u32 sets |*out| to the next, big-endian uint32_t value from |cbs|
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* and advances |cbs|. It returns one on success and zero on error.
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*/
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int CBS_get_u32(CBS *cbs, uint32_t *out);
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/*
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* CBS_get_bytes sets |*out| to the next |len| bytes from |cbs| and advances
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* |cbs|. It returns one on success and zero on error.
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*/
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int CBS_get_bytes(CBS *cbs, CBS *out, size_t len);
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/*
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* CBS_get_u8_length_prefixed sets |*out| to the contents of an 8-bit,
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* length-prefixed value from |cbs| and advances |cbs| over it. It returns one
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* on success and zero on error.
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*/
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int CBS_get_u8_length_prefixed(CBS *cbs, CBS *out);
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/*
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* CBS_get_u16_length_prefixed sets |*out| to the contents of a 16-bit,
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* big-endian, length-prefixed value from |cbs| and advances |cbs| over it. It
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* returns one on success and zero on error.
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*/
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int CBS_get_u16_length_prefixed(CBS *cbs, CBS *out);
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/*
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* CBS_get_u24_length_prefixed sets |*out| to the contents of a 24-bit,
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* big-endian, length-prefixed value from |cbs| and advances |cbs| over it. It
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* returns one on success and zero on error.
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*/
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int CBS_get_u24_length_prefixed(CBS *cbs, CBS *out);
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/* Parsing ASN.1 */
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/*
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* While an identifier can be multiple octets, this library only handles the
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* single octet variety currently. This limits support up to tag number 30
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* since tag number 31 is a reserved value to indicate multiple octets.
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*/
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/* Bits 8 and 7: class tag type: See X.690 section 8.1.2.2. */
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#define CBS_ASN1_UNIVERSAL 0x00
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#define CBS_ASN1_APPLICATION 0x40
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#define CBS_ASN1_CONTEXT_SPECIFIC 0x80
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#define CBS_ASN1_PRIVATE 0xc0
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/* Bit 6: Primitive or constructed: See X.690 section 8.1.2.3. */
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#define CBS_ASN1_PRIMITIVE 0x00
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#define CBS_ASN1_CONSTRUCTED 0x20
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/*
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* Bits 5 to 1 are the tag number. See X.680 section 8.6 for tag numbers of
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* the universal class.
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*/
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/*
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* Common universal identifier octets.
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* See X.690 section 8.1 and X.680 section 8.6 for universal tag numbers.
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*
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* Note: These definitions are the cause of some of the strange behavior in
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* CBS's bs_ber.c.
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*
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* In BER, it is the sender's option to use primitive or constructed for
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* bitstring (X.690 section 8.6.1) and octetstring (X.690 section 8.7.1).
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*
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* In DER, bitstring and octetstring are required to be primitive
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* (X.690 section 10.2).
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*/
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#define CBS_ASN1_BOOLEAN (CBS_ASN1_UNIVERSAL | CBS_ASN1_PRIMITIVE | 0x1)
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#define CBS_ASN1_INTEGER (CBS_ASN1_UNIVERSAL | CBS_ASN1_PRIMITIVE | 0x2)
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#define CBS_ASN1_BITSTRING (CBS_ASN1_UNIVERSAL | CBS_ASN1_PRIMITIVE | 0x3)
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#define CBS_ASN1_OCTETSTRING (CBS_ASN1_UNIVERSAL | CBS_ASN1_PRIMITIVE | 0x4)
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#define CBS_ASN1_OBJECT (CBS_ASN1_UNIVERSAL | CBS_ASN1_PRIMITIVE | 0x6)
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#define CBS_ASN1_ENUMERATED (CBS_ASN1_UNIVERSAL | CBS_ASN1_PRIMITIVE | 0xa)
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#define CBS_ASN1_SEQUENCE (CBS_ASN1_UNIVERSAL | CBS_ASN1_CONSTRUCTED | 0x10)
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#define CBS_ASN1_SET (CBS_ASN1_UNIVERSAL | CBS_ASN1_CONSTRUCTED | 0x11)
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/*
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* CBS_get_asn1 sets |*out| to the contents of DER-encoded, ASN.1 element (not
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* including tag and length bytes) and advances |cbs| over it. The ASN.1
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* element must match |tag_value|. It returns one on success and zero
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* on error.
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*
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* Tag numbers greater than 30 are not supported (i.e. short form only).
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*/
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int CBS_get_asn1(CBS *cbs, CBS *out, unsigned int tag_value);
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/*
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* CBS_get_asn1_element acts like |CBS_get_asn1| but |out| will include the
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* ASN.1 header bytes too.
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*/
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int CBS_get_asn1_element(CBS *cbs, CBS *out, unsigned int tag_value);
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/*
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* CBS_peek_asn1_tag looks ahead at the next ASN.1 tag and returns one
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* if the next ASN.1 element on |cbs| would have tag |tag_value|. If
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* |cbs| is empty or the tag does not match, it returns zero. Note: if
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* it returns one, CBS_get_asn1 may still fail if the rest of the
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* element is malformed.
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*/
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int CBS_peek_asn1_tag(const CBS *cbs, unsigned int tag_value);
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/*
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* CBS_get_any_asn1_element sets |*out| to contain the next ASN.1 element from
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* |*cbs| (including header bytes) and advances |*cbs|. It sets |*out_tag| to
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* the tag number and |*out_header_len| to the length of the ASN.1 header.
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* Each of |out|, |out_tag|, and |out_header_len| may be NULL to ignore
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* the value.
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*
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* Tag numbers greater than 30 are not supported (i.e. short form only).
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*/
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int CBS_get_any_asn1_element(CBS *cbs, CBS *out, unsigned int *out_tag,
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size_t *out_header_len);
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/*
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* CBS_get_asn1_uint64 gets an ASN.1 INTEGER from |cbs| using |CBS_get_asn1|
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* and sets |*out| to its value. It returns one on success and zero on error,
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* where error includes the integer being negative, or too large to represent
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* in 64 bits.
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*/
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int CBS_get_asn1_uint64(CBS *cbs, uint64_t *out);
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/*
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* CBS_get_optional_asn1 gets an optional explicitly-tagged element
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* from |cbs| tagged with |tag| and sets |*out| to its contents. If
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* present, it sets |*out_present| to one, otherwise zero. It returns
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* one on success, whether or not the element was present, and zero on
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* decode failure.
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*/
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int CBS_get_optional_asn1(CBS *cbs, CBS *out, int *out_present,
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unsigned int tag);
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/*
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* CBS_get_optional_asn1_octet_string gets an optional
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* explicitly-tagged OCTET STRING from |cbs|. If present, it sets
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* |*out| to the string and |*out_present| to one. Otherwise, it sets
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* |*out| to empty and |*out_present| to zero. |out_present| may be
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* NULL. It returns one on success, whether or not the element was
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* present, and zero on decode failure.
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*/
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int CBS_get_optional_asn1_octet_string(CBS *cbs, CBS *out, int *out_present,
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unsigned int tag);
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/*
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* CBS_get_optional_asn1_uint64 gets an optional explicitly-tagged
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* INTEGER from |cbs|. If present, it sets |*out| to the
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* value. Otherwise, it sets |*out| to |default_value|. It returns one
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* on success, whether or not the element was present, and zero on
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* decode failure.
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*/
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int CBS_get_optional_asn1_uint64(CBS *cbs, uint64_t *out, unsigned int tag,
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uint64_t default_value);
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/*
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* CBS_get_optional_asn1_bool gets an optional, explicitly-tagged BOOLEAN from
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* |cbs|. If present, it sets |*out| to either zero or one, based on the
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* boolean. Otherwise, it sets |*out| to |default_value|. It returns one on
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* success, whether or not the element was present, and zero on decode
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* failure.
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*/
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int CBS_get_optional_asn1_bool(CBS *cbs, int *out, unsigned int tag,
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int default_value);
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/*
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* CRYPTO ByteBuilder.
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*
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* |CBB| objects allow one to build length-prefixed serialisations. A |CBB|
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* object is associated with a buffer and new buffers are created with
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* |CBB_init|. Several |CBB| objects can point at the same buffer when a
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* length-prefix is pending, however only a single |CBB| can be 'current' at
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* any one time. For example, if one calls |CBB_add_u8_length_prefixed| then
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* the new |CBB| points at the same buffer as the original. But if the original
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* |CBB| is used then the length prefix is written out and the new |CBB| must
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* not be used again.
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*
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* If one needs to force a length prefix to be written out because a |CBB| is
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* going out of scope, use |CBB_flush|.
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*/
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struct cbb_buffer_st {
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uint8_t *buf;
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/* The number of valid bytes. */
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size_t len;
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/* The size of buf. */
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size_t cap;
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/*
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* One iff |buf| is owned by this object. If not then |buf| cannot be
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* resized.
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*/
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char can_resize;
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};
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typedef struct cbb_st {
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struct cbb_buffer_st *base;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* offset is the offset from the start of |base->buf| to the position of any
|
||
|
|
* pending length-prefix.
|
||
|
|
*/
|
||
|
|
size_t offset;
|
||
|
|
|
||
|
|
/* child points to a child CBB if a length-prefix is pending. */
|
||
|
|
struct cbb_st *child;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* pending_len_len contains the number of bytes in a pending length-prefix,
|
||
|
|
* or zero if no length-prefix is pending.
|
||
|
|
*/
|
||
|
|
uint8_t pending_len_len;
|
||
|
|
|
||
|
|
char pending_is_asn1;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* is_top_level is true iff this is a top-level |CBB| (as opposed to a child
|
||
|
|
* |CBB|). Top-level objects are valid arguments for |CBB_finish|.
|
||
|
|
*/
|
||
|
|
char is_top_level;
|
||
|
|
} CBB;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* CBB_init initialises |cbb| with |initial_capacity|. Since a |CBB| grows as
|
||
|
|
* needed, the |initial_capacity| is just a hint. It returns one on success or
|
||
|
|
* zero on error.
|
||
|
|
*/
|
||
|
|
int CBB_init(CBB *cbb, size_t initial_capacity);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* CBB_init_fixed initialises |cbb| to write to |len| bytes at |buf|. Since
|
||
|
|
* |buf| cannot grow, trying to write more than |len| bytes will cause CBB
|
||
|
|
* functions to fail. It returns one on success or zero on error.
|
||
|
|
*/
|
||
|
|
int CBB_init_fixed(CBB *cbb, uint8_t *buf, size_t len);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* CBB_cleanup frees all resources owned by |cbb| and other |CBB| objects
|
||
|
|
* writing to the same buffer. This should be used in an error case where a
|
||
|
|
* serialisation is abandoned.
|
||
|
|
*/
|
||
|
|
void CBB_cleanup(CBB *cbb);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* CBB_finish completes any pending length prefix and sets |*out_data| to a
|
||
|
|
* malloced buffer and |*out_len| to the length of that buffer. The caller
|
||
|
|
* takes ownership of the buffer and, unless the buffer was fixed with
|
||
|
|
* |CBB_init_fixed|, must call |free| when done.
|
||
|
|
*
|
||
|
|
* It can only be called on a "top level" |CBB|, i.e. one initialised with
|
||
|
|
* |CBB_init| or |CBB_init_fixed|. It returns one on success and zero on
|
||
|
|
* error.
|
||
|
|
*/
|
||
|
|
int CBB_finish(CBB *cbb, uint8_t **out_data, size_t *out_len);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* CBB_flush causes any pending length prefixes to be written out and any child
|
||
|
|
* |CBB| objects of |cbb| to be invalidated. It returns one on success or zero
|
||
|
|
* on error.
|
||
|
|
*/
|
||
|
|
int CBB_flush(CBB *cbb);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* CBB_discard_child discards the current unflushed child of |cbb|. Neither the
|
||
|
|
* child's contents nor the length prefix will be included in the output.
|
||
|
|
*/
|
||
|
|
void CBB_discard_child(CBB *cbb);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* CBB_add_u8_length_prefixed sets |*out_contents| to a new child of |cbb|. The
|
||
|
|
* data written to |*out_contents| will be prefixed in |cbb| with an 8-bit
|
||
|
|
* length. It returns one on success or zero on error.
|
||
|
|
*/
|
||
|
|
int CBB_add_u8_length_prefixed(CBB *cbb, CBB *out_contents);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* CBB_add_u16_length_prefixed sets |*out_contents| to a new child of |cbb|.
|
||
|
|
* The data written to |*out_contents| will be prefixed in |cbb| with a 16-bit,
|
||
|
|
* big-endian length. It returns one on success or zero on error.
|
||
|
|
*/
|
||
|
|
int CBB_add_u16_length_prefixed(CBB *cbb, CBB *out_contents);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* CBB_add_u24_length_prefixed sets |*out_contents| to a new child of |cbb|.
|
||
|
|
* The data written to |*out_contents| will be prefixed in |cbb| with a 24-bit,
|
||
|
|
* big-endian length. It returns one on success or zero on error.
|
||
|
|
*/
|
||
|
|
int CBB_add_u24_length_prefixed(CBB *cbb, CBB *out_contents);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* CBB_add_asn sets |*out_contents| to a |CBB| into which the contents of an
|
||
|
|
* ASN.1 object can be written. The |tag| argument will be used as the tag for
|
||
|
|
* the object. Passing in |tag| number 31 will return in an error since only
|
||
|
|
* single octet identifiers are supported. It returns one on success or zero
|
||
|
|
* on error.
|
||
|
|
*/
|
||
|
|
int CBB_add_asn1(CBB *cbb, CBB *out_contents, unsigned int tag);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* CBB_add_bytes appends |len| bytes from |data| to |cbb|. It returns one on
|
||
|
|
* success and zero otherwise.
|
||
|
|
*/
|
||
|
|
int CBB_add_bytes(CBB *cbb, const uint8_t *data, size_t len);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* CBB_add_space appends |len| bytes to |cbb| and sets |*out_data| to point to
|
||
|
|
* the beginning of that space. The caller must then write |len| bytes of
|
||
|
|
* actual contents to |*out_data|. It returns one on success and zero
|
||
|
|
* otherwise.
|
||
|
|
*/
|
||
|
|
int CBB_add_space(CBB *cbb, uint8_t **out_data, size_t len);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* CBB_add_u8 appends an 8-bit number from |value| to |cbb|. It returns one on
|
||
|
|
* success and zero otherwise.
|
||
|
|
*/
|
||
|
|
int CBB_add_u8(CBB *cbb, size_t value);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* CBB_add_u8 appends a 16-bit, big-endian number from |value| to |cbb|. It
|
||
|
|
* returns one on success and zero otherwise.
|
||
|
|
*/
|
||
|
|
int CBB_add_u16(CBB *cbb, size_t value);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* CBB_add_u24 appends a 24-bit, big-endian number from |value| to |cbb|. It
|
||
|
|
* returns one on success and zero otherwise.
|
||
|
|
*/
|
||
|
|
int CBB_add_u24(CBB *cbb, size_t value);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* CBB_add_u32 appends a 32-bit, big-endian number from |value| to |cbb|. It
|
||
|
|
* returns one on success and zero otherwise.
|
||
|
|
*/
|
||
|
|
int CBB_add_u32(CBB *cbb, size_t value);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* CBB_add_asn1_uint64 writes an ASN.1 INTEGER into |cbb| using |CBB_add_asn1|
|
||
|
|
* and writes |value| in its contents. It returns one on success and zero on
|
||
|
|
* error.
|
||
|
|
*/
|
||
|
|
int CBB_add_asn1_uint64(CBB *cbb, uint64_t value);
|
||
|
|
|
||
|
|
#ifdef LIBRESSL_INTERNAL
|
||
|
|
/*
|
||
|
|
* CBS_dup sets |out| to point to cbs's |data| and |len|. It results in two
|
||
|
|
* CBS that point to the same buffer.
|
||
|
|
*/
|
||
|
|
void CBS_dup(const CBS *cbs, CBS *out);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* cbs_get_any_asn1_element sets |*out| to contain the next ASN.1 element from
|
||
|
|
* |*cbs| (including header bytes) and advances |*cbs|. It sets |*out_tag| to
|
||
|
|
* the tag number and |*out_header_len| to the length of the ASN.1 header. If
|
||
|
|
* strict mode is disabled and the element has indefinite length then |*out|
|
||
|
|
* will only contain the header. Each of |out|, |out_tag|, and
|
||
|
|
* |out_header_len| may be NULL to ignore the value.
|
||
|
|
*
|
||
|
|
* Tag numbers greater than 30 are not supported (i.e. short form only).
|
||
|
|
*/
|
||
|
|
int cbs_get_any_asn1_element_internal(CBS *cbs, CBS *out, unsigned int *out_tag,
|
||
|
|
size_t *out_header_len, int strict);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* CBS_asn1_indefinite_to_definite reads an ASN.1 structure from |in|. If it
|
||
|
|
* finds indefinite-length elements that otherwise appear to be valid DER, it
|
||
|
|
* attempts to convert the DER-like data to DER and sets |*out| and
|
||
|
|
* |*out_length| to describe a malloced buffer containing the DER data.
|
||
|
|
* Additionally, |*in| will be advanced over the ASN.1 data.
|
||
|
|
*
|
||
|
|
* If it doesn't find any indefinite-length elements then it sets |*out| to
|
||
|
|
* NULL and |*in| is unmodified.
|
||
|
|
*
|
||
|
|
* This is NOT a conversion from BER to DER. There are many restrictions when
|
||
|
|
* dealing with DER data. This is only concerned with one: indefinite vs.
|
||
|
|
* definite form. However, this suffices to handle the PKCS#7 and PKCS#12 output
|
||
|
|
* from NSS.
|
||
|
|
*
|
||
|
|
* It returns one on success and zero otherwise.
|
||
|
|
*/
|
||
|
|
int CBS_asn1_indefinite_to_definite(CBS *in, uint8_t **out, size_t *out_len);
|
||
|
|
#endif /* LIBRESSL_INTERNAL */
|
||
|
|
|
||
|
|
__END_HIDDEN_DECLS
|
||
|
|
|
||
|
|
#endif /* OPENSSL_HEADER_BYTESTRING_H */
|