diff options
Diffstat (limited to 'src/lib/x509/asn1_alt_name.cpp')
| -rw-r--r-- | src/lib/x509/asn1_alt_name.cpp | 235 |
1 files changed, 235 insertions, 0 deletions
diff --git a/src/lib/x509/asn1_alt_name.cpp b/src/lib/x509/asn1_alt_name.cpp new file mode 100644 index 000000000..8b3d2d6e9 --- /dev/null +++ b/src/lib/x509/asn1_alt_name.cpp @@ -0,0 +1,235 @@ +/* +* AlternativeName +* (C) 1999-2007 Jack Lloyd +* 2007 Yves Jerschow +* +* Botan is released under the Simplified BSD License (see license.txt) +*/ + +#include <botan/asn1_alt_name.h> +#include <botan/der_enc.h> +#include <botan/ber_dec.h> +#include <botan/oids.h> +#include <botan/internal/stl_util.h> +#include <botan/parsing.h> +#include <botan/loadstor.h> + +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& value) + { + if(type.empty() || value.empty()) + return; + + auto range = m_alt_info.equal_range(type); + for(auto j = range.first; j != range.second; ++j) + if(j->second == value) + return; + + multimap_insert(m_alt_info, type, value); + } + +/* +* 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)); + } + +/* +* Return all of the alternative names +*/ +std::multimap<std::string, std::string> AlternativeName::contents() const + { + std::multimap<std::string, std::string> 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; + } + +bool AlternativeName::has_field(const std::string& attr) const + { + auto range = m_alt_info.equal_range(attr); + return (range.first != range.second); + } + +std::vector<std::string> AlternativeName::get_attribute(const std::string& attr) const + { + std::vector<std::string> results; + auto range = m_alt_info.equal_range(attr); + for(auto i = range.first; i != range.second; ++i) + results.push_back(i->second); + return results; + } + +/* +* 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<std::string, std::string>& 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.value()); + } + else if(type == "IP") + { + const uint32_t ip = string_to_ipv4(i->second); + uint8_t 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) + { + if(tag == 1) add_attribute("RFC822", ASN1::to_string(obj)); + if(tag == 2) add_attribute("DNS", ASN1::to_string(obj)); + if(tag == 6) add_attribute("URI", ASN1::to_string(obj)); + } + else if(tag == 7) + { + if(obj.value.size() == 4) + { + const uint32_t ip = load_be<uint32_t>(&obj.value[0], 0); + add_attribute("IP", ipv4_to_string(ip)); + } + } + + } + } + +} |