Split asn1_obj.h into asn1_alt_name.h, asn1_attribute.h, and

asn1_time.h

1 files changed, 241 insertions, 0 deletions

diff --git a/src/asn1/asn1_alt_name.cpp b/src/asn1/asn1_alt_name.cpp
new file mode 100644
index 000000000..2e7116bac
--- /dev/null
+++ b/src/asn1/asn1_alt_name.cpp
@@ -0,0 +1,241 @@
+/*
+* AlternativeName
+* (C) 1999-2007 Jack Lloyd
+*     2007 Yves Jerschow
+*
+* Distributed under the terms of the Botan license
+*/
+
+#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/charset.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& str)
+   {
+   if(type == "" || str == "")
+      return;
+
+   auto range = alt_info.equal_range(type);
+   for(auto 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;
+
+   for(auto i = alt_info.begin(); i != alt_info.end(); ++i)
+      multimap_insert(names, i->first, i->second);
+
+   for(auto i = othernames.begin(); i != 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 (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)
+   {
+   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, 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));
+
+   for(auto 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;
+
+      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<u32bit>(&obj.value[0], 0);
+            add_attribute("IP", ipv4_to_string(ip));
+            }
+         }
+
+      }
+   }
+
+}