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/*************************************************
* PKCS #10 Source File *
* (C) 1999-2006 The Botan Project *
*************************************************/
#include <botan/pkcs10.h>
#include <botan/der_enc.h>
#include <botan/ber_dec.h>
#include <botan/parsing.h>
#include <botan/x509stor.h>
#include <botan/x509_ext.h>
#include <botan/oids.h>
#include <botan/pem.h>
namespace Botan {
/*************************************************
* PKCS10_Request Constructor *
*************************************************/
PKCS10_Request::PKCS10_Request(DataSource& in) :
X509_Object(in, "CERTIFICATE REQUEST/NEW CERTIFICATE REQUEST")
{
do_decode();
}
/*************************************************
* PKCS10_Request Constructor *
*************************************************/
PKCS10_Request::PKCS10_Request(const std::string& in) :
X509_Object(in, "CERTIFICATE REQUEST/NEW CERTIFICATE REQUEST")
{
do_decode();
}
/*************************************************
* Deocde the CertificateRequestInfo *
*************************************************/
void PKCS10_Request::force_decode()
{
BER_Decoder cert_req_info(tbs_bits);
u32bit version;
cert_req_info.decode(version);
if(version != 0)
throw Decoding_Error("Unknown version code in PKCS #10 request: " +
to_string(version));
X509_DN dn_subject;
cert_req_info.decode(dn_subject);
info.add(dn_subject.contents());
BER_Object public_key = cert_req_info.get_next_object();
if(public_key.type_tag != SEQUENCE || public_key.class_tag != CONSTRUCTED)
throw BER_Bad_Tag("PKCS10_Request: Unexpected tag for public key",
public_key.type_tag, public_key.class_tag);
info.add("X509.Certificate.public_key",
PEM_Code::encode(
ASN1::put_in_sequence(public_key.value),
"PUBLIC KEY"
)
);
BER_Object attr_bits = cert_req_info.get_next_object();
if(attr_bits.type_tag == 0 &&
attr_bits.class_tag == ASN1_Tag(CONSTRUCTED | CONTEXT_SPECIFIC))
{
BER_Decoder attributes(attr_bits.value);
while(attributes.more_items())
{
Attribute attr;
attributes.decode(attr);
handle_attribute(attr);
}
attributes.verify_end();
}
else if(attr_bits.type_tag != NO_OBJECT)
throw BER_Bad_Tag("PKCS10_Request: Unexpected tag for attributes",
attr_bits.type_tag, attr_bits.class_tag);
cert_req_info.verify_end();
X509_Code sig_check = X509_Store::check_sig(*this, subject_public_key());
if(sig_check != VERIFIED)
throw Decoding_Error("PKCS #10 request: Bad signature detected");
}
/*************************************************
* Handle attributes in a PKCS #10 request *
*************************************************/
void PKCS10_Request::handle_attribute(const Attribute& attr)
{
BER_Decoder value(attr.parameters);
if(attr.oid == OIDS::lookup("PKCS9.EmailAddress"))
{
ASN1_String email;
value.decode(email);
info.add("RFC822", email.value());
}
else if(attr.oid == OIDS::lookup("PKCS9.ChallengePassword"))
{
ASN1_String challenge_password;
value.decode(challenge_password);
info.add("PKCS9.ChallengePassword", challenge_password.value());
}
else if(attr.oid == OIDS::lookup("PKCS9.ExtensionRequest"))
{
BER_Decoder sequence = value.start_cons(SEQUENCE);
while(sequence.more_items())
{
Extension extn;
sequence.decode(extn);
handle_v3_extension(extn);
}
sequence.verify_end();
}
}
/*************************************************
* Decode a requested X.509v3 extension *
*************************************************/
void PKCS10_Request::handle_v3_extension(const Extension& extn)
{
BER_Decoder value(extn.value);
if(extn.oid == OIDS::lookup("X509v3.KeyUsage"))
{
Key_Constraints constraints;
BER::decode(value, constraints);
if(constraints != NO_CONSTRAINTS)
info.add("X509v3.KeyUsage", constraints);
}
else if(extn.oid == OIDS::lookup("X509v3.ExtendedKeyUsage"))
{
BER_Decoder key_usage = value.start_cons(SEQUENCE);
while(key_usage.more_items())
{
OID usage_oid;
key_usage.decode(usage_oid);
info.add("X509v3.ExtendedKeyUsage", usage_oid.as_string());
}
}
else if(extn.oid == OIDS::lookup("X509v3.BasicConstraints"))
{
u32bit max_path_len = 0;
bool is_ca = false;
value.start_cons(SEQUENCE)
.decode_optional(is_ca, BOOLEAN, UNIVERSAL, false)
.decode_optional(max_path_len, INTEGER, UNIVERSAL,
NO_CERT_PATH_LIMIT)
.verify_end()
.end_cons();
info.add("X509v3.BasicConstraints.is_ca", (is_ca ? 1 : 0));
info.add("X509v3.BasicConstraints.path_constraint", max_path_len);
}
else if(extn.oid == OIDS::lookup("X509v3.SubjectAlternativeName"))
{
AlternativeName alt_name;
value.decode(alt_name);
info.add(alt_name.contents());
}
else
return;
value.verify_end();
}
/*************************************************
* Return the challenge password (if any) *
*************************************************/
std::string PKCS10_Request::challenge_password() const
{
return info.get1("PKCS9.ChallengePassword");
}
/*************************************************
* Return the name of the requestor *
*************************************************/
X509_DN PKCS10_Request::subject_dn() const
{
return create_dn(info);
}
/*************************************************
* Return the public key of the requestor *
*************************************************/
MemoryVector<byte> PKCS10_Request::raw_public_key() const
{
DataSource_Memory source(info.get1("X509.Certificate.public_key"));
return PEM_Code::decode_check_label(source, "PUBLIC KEY");
}
/*************************************************
* Return the public key of the requestor *
*************************************************/
X509_PublicKey* PKCS10_Request::subject_public_key() const
{
DataSource_Memory source(info.get1("X509.Certificate.public_key"));
return X509::load_key(source);
}
/*************************************************
* Return the alternative names of the requestor *
*************************************************/
AlternativeName PKCS10_Request::subject_alt_name() const
{
return create_alt_name(info);
}
/*************************************************
* Return the key constraints (if any) *
*************************************************/
Key_Constraints PKCS10_Request::constraints() const
{
return Key_Constraints(info.get1_u32bit("X509v3.KeyUsage", NO_CONSTRAINTS));
}
/*************************************************
* Return the extendend key constraints (if any) *
*************************************************/
std::vector<OID> PKCS10_Request::ex_constraints() const
{
std::vector<std::string> oids = info.get("X509v3.ExtendedKeyUsage");
std::vector<OID> result;
for(u32bit j = 0; j != oids.size(); ++j)
result.push_back(OIDS::lookup(oids[j]));
return result;
}
/*************************************************
* Return is a CA certificate is requested *
*************************************************/
bool PKCS10_Request::is_CA() const
{
return info.get1_u32bit("X509v3.BasicConstraints.is_ca");
}
/*************************************************
* Return the desired path limit (if any) *
*************************************************/
u32bit PKCS10_Request::path_limit() const
{
return info.get1_u32bit("X509v3.BasicConstraints.path_constraint", 0);
}
}
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