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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "parse_name.h"
#include <cassert>
#include <openssl/bytestring.h>
#include <openssl/mem.h>
#include "parse_values.h"
#include "string_util.h"
namespace bssl {
namespace {
// Returns a string containing the dotted numeric form of |oid|, or an empty
// string on error.
std::string OidToString(der::Input oid) {
CBS cbs;
CBS_init(&cbs, oid.data(), oid.size());
bssl::UniquePtr<char> text(CBS_asn1_oid_to_text(&cbs));
if (!text) {
return std::string();
}
return text.get();
}
} // namespace
bool X509NameAttribute::ValueAsString(std::string *out) const {
switch (value_tag) {
case CBS_ASN1_T61STRING:
return der::ParseTeletexStringAsLatin1(value, out);
case CBS_ASN1_IA5STRING:
return der::ParseIA5String(value, out);
case CBS_ASN1_PRINTABLESTRING:
return der::ParsePrintableString(value, out);
case CBS_ASN1_UTF8STRING:
*out = BytesAsStringView(value);
return true;
case CBS_ASN1_UNIVERSALSTRING:
return der::ParseUniversalString(value, out);
case CBS_ASN1_BMPSTRING:
return der::ParseBmpString(value, out);
default:
return false;
}
}
bool X509NameAttribute::ValueAsStringWithUnsafeOptions(
PrintableStringHandling printable_string_handling, std::string *out) const {
if (printable_string_handling == PrintableStringHandling::kAsUTF8Hack &&
value_tag == CBS_ASN1_PRINTABLESTRING) {
*out = BytesAsStringView(value);
return true;
}
return ValueAsString(out);
}
bool X509NameAttribute::ValueAsStringUnsafe(std::string *out) const {
switch (value_tag) {
case CBS_ASN1_IA5STRING:
case CBS_ASN1_PRINTABLESTRING:
case CBS_ASN1_T61STRING:
case CBS_ASN1_UTF8STRING:
*out = BytesAsStringView(value);
return true;
case CBS_ASN1_UNIVERSALSTRING:
return der::ParseUniversalString(value, out);
case CBS_ASN1_BMPSTRING:
return der::ParseBmpString(value, out);
default:
assert(0); // NOTREACHED
return false;
}
}
bool X509NameAttribute::AsRFC2253String(std::string *out) const {
std::string type_string;
std::string value_string;
// TODO(mattm): Add streetAddress and domainComponent here?
if (type == der::Input(kTypeCommonNameOid)) {
type_string = "CN";
} else if (type == der::Input(kTypeSurnameOid)) {
type_string = "SN";
} else if (type == der::Input(kTypeCountryNameOid)) {
type_string = "C";
} else if (type == der::Input(kTypeLocalityNameOid)) {
type_string = "L";
} else if (type == der::Input(kTypeStateOrProvinceNameOid)) {
type_string = "ST";
} else if (type == der::Input(kTypeOrganizationNameOid)) {
type_string = "O";
} else if (type == der::Input(kTypeOrganizationUnitNameOid)) {
type_string = "OU";
} else if (type == der::Input(kTypeGivenNameOid)) {
type_string = "givenName";
} else if (type == der::Input(kTypeEmailAddressOid)) {
type_string = "emailAddress";
} else {
type_string = OidToString(type);
if (type_string.empty()) {
return false;
}
value_string = "#" + bssl::string_util::HexEncode(value);
}
if (value_string.empty()) {
std::string unescaped;
if (!ValueAsStringUnsafe(&unescaped)) {
return false;
}
bool nonprintable = false;
for (unsigned int i = 0; i < unescaped.length(); ++i) {
uint8_t c = static_cast<uint8_t>(unescaped[i]);
if (i == 0 && c == '#') {
value_string += "\\#";
} else if (i == 0 && c == ' ') {
value_string += "\\ ";
} else if (i == unescaped.length() - 1 && c == ' ') {
value_string += "\\ ";
} else if (c == ',' || c == '+' || c == '"' || c == '\\' || c == '<' ||
c == '>' || c == ';') {
value_string += "\\";
value_string += c;
} else if (c < 32 || c > 126) {
nonprintable = true;
value_string += "\\" + bssl::string_util::HexEncode(Span(&c, 1));
} else {
value_string += c;
}
}
// If we have non-printable characters in a TeletexString, we hex encode
// since we don't handle Teletex control codes.
if (nonprintable && value_tag == CBS_ASN1_T61STRING) {
value_string = "#" + bssl::string_util::HexEncode(value);
}
}
*out = type_string + "=" + value_string;
return true;
}
bool ReadRdn(der::Parser *parser, RelativeDistinguishedName *out) {
while (parser->HasMore()) {
der::Parser attr_type_and_value;
if (!parser->ReadSequence(&attr_type_and_value)) {
return false;
}
// Read the attribute type, which must be an OBJECT IDENTIFIER.
der::Input type;
if (!attr_type_and_value.ReadTag(CBS_ASN1_OBJECT, &type)) {
return false;
}
// Read the attribute value.
CBS_ASN1_TAG tag;
der::Input value;
if (!attr_type_and_value.ReadTagAndValue(&tag, &value)) {
return false;
}
// There should be no more elements in the sequence after reading the
// attribute type and value.
if (attr_type_and_value.HasMore()) {
return false;
}
out->push_back(X509NameAttribute(type, tag, value));
}
// RFC 5280 section 4.1.2.4
// RelativeDistinguishedName ::= SET SIZE (1..MAX) OF AttributeTypeAndValue
return out->size() != 0;
}
bool ParseName(der::Input name_tlv, RDNSequence *out) {
der::Parser name_parser(name_tlv);
der::Input name_value;
if (!name_parser.ReadTag(CBS_ASN1_SEQUENCE, &name_value)) {
return false;
}
return ParseNameValue(name_value, out);
}
bool ParseNameValue(der::Input name_value, RDNSequence *out) {
der::Parser rdn_sequence_parser(name_value);
while (rdn_sequence_parser.HasMore()) {
der::Parser rdn_parser;
if (!rdn_sequence_parser.ReadConstructed(CBS_ASN1_SET, &rdn_parser)) {
return false;
}
RelativeDistinguishedName type_and_values;
if (!ReadRdn(&rdn_parser, &type_and_values)) {
return false;
}
out->push_back(type_and_values);
}
return true;
}
bool ConvertToRFC2253(const RDNSequence &rdn_sequence, std::string *out) {
std::string rdns_string;
size_t size = rdn_sequence.size();
for (size_t i = 0; i < size; ++i) {
RelativeDistinguishedName rdn = rdn_sequence[size - i - 1];
std::string rdn_string;
for (const auto &atv : rdn) {
if (!rdn_string.empty()) {
rdn_string += "+";
}
std::string atv_string;
if (!atv.AsRFC2253String(&atv_string)) {
return false;
}
rdn_string += atv_string;
}
if (!rdns_string.empty()) {
rdns_string += ",";
}
rdns_string += rdn_string;
}
*out = rdns_string;
return true;
}
} // namespace bssl