diff options
Diffstat (limited to 'src/asn1/asn1_alt.cpp')
| -rw-r--r-- | src/asn1/asn1_alt.cpp | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/src/asn1/asn1_alt.cpp b/src/asn1/asn1_alt.cpp new file mode 100644 index 000000000..035f918cb --- /dev/null +++ b/src/asn1/asn1_alt.cpp @@ -0,0 +1,226 @@ +/************************************************* +* AlternativeName Source File * +* (C) 1999-2007 Jack Lloyd * +* 2007 Yves Jerschow * +*************************************************/ + +#include <botan/asn1_obj.h> +#include <botan/der_enc.h> +#include <botan/ber_dec.h> +#include <botan/oids.h> +#include <botan/stl_util.h> +#include <botan/charset.h> +#include <botan/parsing.h> +#include <botan/loadstor.h> + +namespace Botan { + +/************************************************* +* 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 == "" || str == "") + return; + + typedef std::multimap<std::string, std::string>::iterator iter; + std::pair<iter, iter> range = alt_info.equal_range(type); + for(iter j = range.first; j != range.second; ++j) + if(j->second == str) + return; + + multimap_insert(alt_info, type, str); + } + +/************************************************* +* Add an OtherName field * +*************************************************/ +void AlternativeName::add_othername(const OID& oid, const std::string& value, + ASN1_Tag type) + { + if(value == "") + return; + multimap_insert(othernames, oid, ASN1_String(value, type)); + } + +/************************************************* +* Get the attributes of this alternative name * +*************************************************/ +std::multimap<std::string, std::string> AlternativeName::get_attributes() const + { + return alt_info; + } + +/************************************************* +* Get the otherNames * +*************************************************/ +std::multimap<OID, ASN1_String> AlternativeName::get_othernames() const + { + return othernames; + } + +/************************************************* +* Return all of the alternative names * +*************************************************/ +std::multimap<std::string, std::string> AlternativeName::contents() const + { + std::multimap<std::string, std::string> names; + + typedef std::multimap<std::string, std::string>::const_iterator rdn_iter; + for(rdn_iter j = alt_info.begin(); j != alt_info.end(); ++j) + multimap_insert(names, j->first, j->second); + + typedef std::multimap<OID, ASN1_String>::const_iterator on_iter; + for(on_iter j = othernames.begin(); j != othernames.end(); ++j) + multimap_insert(names, OIDS::lookup(j->first), j->second.value()); + + return names; + } + +/************************************************* +* Return if this object has anything useful * +*************************************************/ +bool AlternativeName::has_items() const + { + return (alt_info.size() > 0 || 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) + { + typedef std::multimap<std::string, std::string>::const_iterator iter; + + std::pair<iter, iter> range = attr.equal_range(type); + for(iter j = range.first; j != range.second; ++j) + { + if(type == "RFC822" || type == "DNS" || type == "URI") + { + ASN1_String asn1_string(j->second, IA5_STRING); + encoder.add_object(tagging, CONTEXT_SPECIFIC, asn1_string.iso_8859()); + } + else if(type == "IP") + { + u32bit ip = string_to_ipv4(j->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, alt_info, "RFC822", ASN1_Tag(1)); + encode_entries(der, alt_info, "DNS", ASN1_Tag(2)); + encode_entries(der, alt_info, "URI", ASN1_Tag(6)); + encode_entries(der, alt_info, "IP", ASN1_Tag(7)); + + std::multimap<OID, ASN1_String>::const_iterator i; + for(i = othernames.begin(); i != 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; + + 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(); + + 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) + { + u32bit ip = load_be<u32bit>(obj.value.begin(), 0); + add_attribute("IP", ipv4_to_string(ip)); + } + } + + } + } + +} |