/* * AlternativeName * (C) 1999-2007 Jack Lloyd * 2007 Yves Jerschow * * Botan is released under the Simplified BSD License (see license.txt) */ #include #include #include #include #include #include #include #include namespace Botan { namespace { /* * Check if type is a known ASN.1 string type */ bool is_string_type(ASN1_Tag tag) { return (tag == NUMERIC_STRING || tag == PRINTABLE_STRING || tag == VISIBLE_STRING || tag == T61_STRING || tag == IA5_STRING || tag == UTF8_STRING || tag == BMP_STRING); } } /* * Create an AlternativeName */ AlternativeName::AlternativeName(const std::string& email_addr, const std::string& uri, const std::string& dns, const std::string& ip) { add_attribute("RFC822", email_addr); add_attribute("DNS", dns); add_attribute("URI", uri); add_attribute("IP", ip); } /* * Add an attribute to an alternative name */ void AlternativeName::add_attribute(const std::string& type, const std::string& str) { if(type.empty() || str.empty()) return; auto range = m_alt_info.equal_range(type); for(auto j = range.first; j != range.second; ++j) if(j->second == str) return; multimap_insert(m_alt_info, type, str); } /* * Add an OtherName field */ void AlternativeName::add_othername(const OID& oid, const std::string& value, ASN1_Tag type) { if(value.empty()) return; multimap_insert(m_othernames, oid, ASN1_String(value, type)); } /* * Get the attributes of this alternative name */ std::multimap AlternativeName::get_attributes() const { return m_alt_info; } /* * Get the otherNames */ std::multimap AlternativeName::get_othernames() const { return m_othernames; } /* * Return all of the alternative names */ std::multimap AlternativeName::contents() const { std::multimap names; for(auto i = m_alt_info.begin(); i != m_alt_info.end(); ++i) multimap_insert(names, i->first, i->second); for(auto i = m_othernames.begin(); i != m_othernames.end(); ++i) multimap_insert(names, OIDS::lookup(i->first), i->second.value()); return names; } /* * Return if this object has anything useful */ bool AlternativeName::has_items() const { return (m_alt_info.size() > 0 || m_othernames.size() > 0); } namespace { /* * DER encode an AlternativeName entry */ void encode_entries(DER_Encoder& encoder, const std::multimap& attr, const std::string& type, ASN1_Tag tagging) { auto range = attr.equal_range(type); for(auto i = range.first; i != range.second; ++i) { if(type == "RFC822" || type == "DNS" || type == "URI") { ASN1_String asn1_string(i->second, IA5_STRING); encoder.add_object(tagging, CONTEXT_SPECIFIC, asn1_string.iso_8859()); } else if(type == "IP") { const u32bit ip = string_to_ipv4(i->second); byte ip_buf[4] = { 0 }; store_be(ip, ip_buf); encoder.add_object(tagging, CONTEXT_SPECIFIC, ip_buf, 4); } } } } /* * DER encode an AlternativeName extension */ void AlternativeName::encode_into(DER_Encoder& der) const { der.start_cons(SEQUENCE); encode_entries(der, m_alt_info, "RFC822", ASN1_Tag(1)); encode_entries(der, m_alt_info, "DNS", ASN1_Tag(2)); encode_entries(der, m_alt_info, "URI", ASN1_Tag(6)); encode_entries(der, m_alt_info, "IP", ASN1_Tag(7)); for(auto i = m_othernames.begin(); i != m_othernames.end(); ++i) { der.start_explicit(0) .encode(i->first) .start_explicit(0) .encode(i->second) .end_explicit() .end_explicit(); } der.end_cons(); } /* * Decode a BER encoded AlternativeName */ void AlternativeName::decode_from(BER_Decoder& source) { BER_Decoder names = source.start_cons(SEQUENCE); while(names.more_items()) { BER_Object obj = names.get_next_object(); if((obj.class_tag != CONTEXT_SPECIFIC) && (obj.class_tag != (CONTEXT_SPECIFIC | CONSTRUCTED))) continue; const ASN1_Tag tag = obj.type_tag; if(tag == 0) { BER_Decoder othername(obj.value); OID oid; othername.decode(oid); if(othername.more_items()) { BER_Object othername_value_outer = othername.get_next_object(); othername.verify_end(); if(othername_value_outer.type_tag != ASN1_Tag(0) || othername_value_outer.class_tag != (CONTEXT_SPECIFIC | CONSTRUCTED) ) throw Decoding_Error("Invalid tags on otherName value"); BER_Decoder othername_value_inner(othername_value_outer.value); BER_Object value = othername_value_inner.get_next_object(); othername_value_inner.verify_end(); const ASN1_Tag value_type = value.type_tag; if(is_string_type(value_type) && value.class_tag == UNIVERSAL) add_othername(oid, ASN1::to_string(value), value_type); } } else if(tag == 1 || tag == 2 || tag == 6) { const std::string value = Charset::transcode(ASN1::to_string(obj), LATIN1_CHARSET, LOCAL_CHARSET); if(tag == 1) add_attribute("RFC822", value); if(tag == 2) add_attribute("DNS", value); if(tag == 6) add_attribute("URI", value); } else if(tag == 7) { if(obj.value.size() == 4) { const u32bit ip = load_be(&obj.value[0], 0); add_attribute("IP", ipv4_to_string(ip)); } } } } }