From c1f6acb1132a3014b5f1be04adc57d03d6851dbb Mon Sep 17 00:00:00 2001 From: doug <> Date: Fri, 6 Feb 2015 09:36:16 +0000 Subject: Import BoringSSL's crypto bytestring and crypto bytebuilder APIs. This is imported with as few changes as possible for the initial commit. I removed OPENSSL_EXPORT, replaced OPENSSL_malloc() etc with malloc() and changed a few header includes. BoringSSL has this as part of their public API. We're leaving it internal to libssl for now. Based on BoringSSL's CBB/CBS API as of commit c5cc15b4f5b1d6e9b9112cb8d30205a638aa2c54. input + ok jsing@, miod@ --- src/lib/libssl/bs_cbs.c | 390 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 390 insertions(+) create mode 100644 src/lib/libssl/bs_cbs.c (limited to 'src/lib/libssl/bs_cbs.c') diff --git a/src/lib/libssl/bs_cbs.c b/src/lib/libssl/bs_cbs.c new file mode 100644 index 0000000000..7edfe65288 --- /dev/null +++ b/src/lib/libssl/bs_cbs.c @@ -0,0 +1,390 @@ +/* $OpenBSD: bs_cbs.c,v 1.1 2015/02/06 09:36:16 doug Exp $ */ +/* + * Copyright (c) 2014, Google Inc. + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY + * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION + * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN + * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ + +#include +#include +#include + +#include +#include +#include + +#include "bytestring.h" + +void CBS_init(CBS *cbs, const uint8_t *data, size_t len) { + cbs->data = data; + cbs->len = len; +} + +static int cbs_get(CBS *cbs, const uint8_t **p, size_t n) { + if (cbs->len < n) { + return 0; + } + + *p = cbs->data; + cbs->data += n; + cbs->len -= n; + return 1; +} + +int CBS_skip(CBS *cbs, size_t len) { + const uint8_t *dummy; + return cbs_get(cbs, &dummy, len); +} + +const uint8_t *CBS_data(const CBS *cbs) { + return cbs->data; +} + +size_t CBS_len(const CBS *cbs) { + return cbs->len; +} + +int CBS_stow(const CBS *cbs, uint8_t **out_ptr, size_t *out_len) { + if (*out_ptr != NULL) { + free(*out_ptr); + *out_ptr = NULL; + } + *out_len = 0; + + if (cbs->len == 0) { + return 1; + } + *out_ptr = BUF_memdup(cbs->data, cbs->len); + if (*out_ptr == NULL) { + return 0; + } + *out_len = cbs->len; + return 1; +} + +int CBS_strdup(const CBS *cbs, char **out_ptr) { + if (*out_ptr != NULL) { + free(*out_ptr); + } + *out_ptr = strndup((const char*)cbs->data, cbs->len); + return (*out_ptr != NULL); +} + +int CBS_contains_zero_byte(const CBS *cbs) { + return memchr(cbs->data, 0, cbs->len) != NULL; +} + +int CBS_mem_equal(const CBS *cbs, const uint8_t *data, size_t len) { + if (len != cbs->len) + return 0; + return CRYPTO_memcmp(cbs->data, data, len) == 0; +} + +static int cbs_get_u(CBS *cbs, uint32_t *out, size_t len) { + uint32_t result = 0; + size_t i; + const uint8_t *data; + + if (!cbs_get(cbs, &data, len)) { + return 0; + } + for (i = 0; i < len; i++) { + result <<= 8; + result |= data[i]; + } + *out = result; + return 1; +} + +int CBS_get_u8(CBS *cbs, uint8_t *out) { + const uint8_t *v; + if (!cbs_get(cbs, &v, 1)) { + return 0; + } + *out = *v; + return 1; +} + +int CBS_get_u16(CBS *cbs, uint16_t *out) { + uint32_t v; + if (!cbs_get_u(cbs, &v, 2)) { + return 0; + } + *out = v; + return 1; +} + +int CBS_get_u24(CBS *cbs, uint32_t *out) { + return cbs_get_u(cbs, out, 3); +} + +int CBS_get_u32(CBS *cbs, uint32_t *out) { + return cbs_get_u(cbs, out, 4); +} + +int CBS_get_bytes(CBS *cbs, CBS *out, size_t len) { + const uint8_t *v; + if (!cbs_get(cbs, &v, len)) { + return 0; + } + CBS_init(out, v, len); + return 1; +} + +static int cbs_get_length_prefixed(CBS *cbs, CBS *out, size_t len_len) { + uint32_t len; + if (!cbs_get_u(cbs, &len, len_len)) { + return 0; + } + return CBS_get_bytes(cbs, out, len); +} + +int CBS_get_u8_length_prefixed(CBS *cbs, CBS *out) { + return cbs_get_length_prefixed(cbs, out, 1); +} + +int CBS_get_u16_length_prefixed(CBS *cbs, CBS *out) { + return cbs_get_length_prefixed(cbs, out, 2); +} + +int CBS_get_u24_length_prefixed(CBS *cbs, CBS *out) { + return cbs_get_length_prefixed(cbs, out, 3); +} + +int CBS_get_any_asn1_element(CBS *cbs, CBS *out, unsigned *out_tag, + size_t *out_header_len) { + uint8_t tag, length_byte; + CBS header = *cbs; + CBS throwaway; + + if (out == NULL) { + out = &throwaway; + } + + if (!CBS_get_u8(&header, &tag) || + !CBS_get_u8(&header, &length_byte)) { + return 0; + } + + if ((tag & 0x1f) == 0x1f) { + /* Long form tags are not supported. */ + return 0; + } + + if (out_tag != NULL) { + *out_tag = tag; + } + + size_t len; + if ((length_byte & 0x80) == 0) { + /* Short form length. */ + len = ((size_t) length_byte) + 2; + if (out_header_len != NULL) { + *out_header_len = 2; + } + } else { + /* Long form length. */ + const size_t num_bytes = length_byte & 0x7f; + uint32_t len32; + + if ((tag & CBS_ASN1_CONSTRUCTED) != 0 && num_bytes == 0) { + /* indefinite length */ + *out_header_len = 2; + return CBS_get_bytes(cbs, out, 2); + } + + if (num_bytes == 0 || num_bytes > 4) { + return 0; + } + if (!cbs_get_u(&header, &len32, num_bytes)) { + return 0; + } + if (len32 < 128) { + /* Length should have used short-form encoding. */ + return 0; + } + if ((len32 >> ((num_bytes-1)*8)) == 0) { + /* Length should have been at least one byte shorter. */ + return 0; + } + len = len32; + if (len + 2 + num_bytes < len) { + /* Overflow. */ + return 0; + } + len += 2 + num_bytes; + if (out_header_len != NULL) { + *out_header_len = 2 + num_bytes; + } + } + + return CBS_get_bytes(cbs, out, len); +} + +static int cbs_get_asn1(CBS *cbs, CBS *out, unsigned tag_value, + int skip_header) { + size_t header_len; + unsigned tag; + CBS throwaway; + + if (out == NULL) { + out = &throwaway; + } + + if (!CBS_get_any_asn1_element(cbs, out, &tag, &header_len) || + tag != tag_value || + (header_len > 0 && + /* This ensures that the tag is either zero length or + * indefinite-length. */ + CBS_len(out) == header_len && + CBS_data(out)[header_len - 1] == 0x80)) { + return 0; + } + + if (skip_header && !CBS_skip(out, header_len)) { + assert(0); + return 0; + } + + return 1; +} + +int CBS_get_asn1(CBS *cbs, CBS *out, unsigned tag_value) { + return cbs_get_asn1(cbs, out, tag_value, 1 /* skip header */); +} + +int CBS_get_asn1_element(CBS *cbs, CBS *out, unsigned tag_value) { + return cbs_get_asn1(cbs, out, tag_value, 0 /* include header */); +} + +int CBS_peek_asn1_tag(const CBS *cbs, unsigned tag_value) { + if (CBS_len(cbs) < 1) { + return 0; + } + return CBS_data(cbs)[0] == tag_value; +} + +int CBS_get_asn1_uint64(CBS *cbs, uint64_t *out) { + CBS bytes; + const uint8_t *data; + size_t i, len; + + if (!CBS_get_asn1(cbs, &bytes, CBS_ASN1_INTEGER)) { + return 0; + } + + *out = 0; + data = CBS_data(&bytes); + len = CBS_len(&bytes); + + if (len == 0) { + /* An INTEGER is encoded with at least one octet. */ + return 0; + } + + if ((data[0] & 0x80) != 0) { + /* negative number */ + return 0; + } + + for (i = 0; i < len; i++) { + if ((*out >> 56) != 0) { + /* Too large to represent as a uint64_t. */ + return 0; + } + *out <<= 8; + *out |= data[i]; + } + + return 1; +} + +int CBS_get_optional_asn1(CBS *cbs, CBS *out, int *out_present, unsigned tag) { + if (CBS_peek_asn1_tag(cbs, tag)) { + if (!CBS_get_asn1(cbs, out, tag)) { + return 0; + } + *out_present = 1; + } else { + *out_present = 0; + } + return 1; +} + +int CBS_get_optional_asn1_octet_string(CBS *cbs, CBS *out, int *out_present, + unsigned tag) { + CBS child; + int present; + if (!CBS_get_optional_asn1(cbs, &child, &present, tag)) { + return 0; + } + if (present) { + if (!CBS_get_asn1(&child, out, CBS_ASN1_OCTETSTRING) || + CBS_len(&child) != 0) { + return 0; + } + } else { + CBS_init(out, NULL, 0); + } + if (out_present) { + *out_present = present; + } + return 1; +} + +int CBS_get_optional_asn1_uint64(CBS *cbs, uint64_t *out, unsigned tag, + uint64_t default_value) { + CBS child; + int present; + if (!CBS_get_optional_asn1(cbs, &child, &present, tag)) { + return 0; + } + if (present) { + if (!CBS_get_asn1_uint64(&child, out) || + CBS_len(&child) != 0) { + return 0; + } + } else { + *out = default_value; + } + return 1; +} + +int CBS_get_optional_asn1_bool(CBS *cbs, int *out, unsigned tag, + int default_value) { + CBS child, child2; + int present; + if (!CBS_get_optional_asn1(cbs, &child, &present, tag)) { + return 0; + } + if (present) { + uint8_t boolean; + + if (!CBS_get_asn1(&child, &child2, CBS_ASN1_BOOLEAN) || + CBS_len(&child2) != 1 || + CBS_len(&child) != 0) { + return 0; + } + + boolean = CBS_data(&child2)[0]; + if (boolean == 0) { + *out = 0; + } else if (boolean == 0xff) { + *out = 1; + } else { + return 0; + } + } else { + *out = default_value; + } + return 1; +} -- cgit v1.2.3-55-g6feb