#include "krb5_locl.h"
KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_mk_rep(krb5_context context,
krb5_auth_context auth_context,
krb5_data *outbuf)
{
krb5_crypto crypto = NULL;
krb5_error_code ret;
uint8_t *buf = NULL;
EncAPRepPart body;
size_t buf_size;
size_t len = 0;
AP_REP ap;
memset (&ap, 0, sizeof(ap));
memset (&body, 0, sizeof(body));
ap.pvno = 5;
ap.msg_type = krb_ap_rep;
body.ctime = auth_context->authenticator->ctime;
body.cusec = auth_context->authenticator->cusec;
if (auth_context->flags & KRB5_AUTH_CONTEXT_USE_SUBKEY) {
if (auth_context->local_subkey == NULL) {
ret = krb5_auth_con_generatelocalsubkey(context,
auth_context,
auth_context->keyblock);
if(ret)
goto out;
}
ret = krb5_copy_keyblock(context, auth_context->local_subkey,
&body.subkey);
if (ret) {
ret = krb5_enomem(context);
goto out;
}
} else
body.subkey = NULL;
if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) {
if(auth_context->local_seqnumber == 0)
krb5_generate_seq_number (context,
auth_context->keyblock,
&auth_context->local_seqnumber);
ALLOC(body.seq_number, 1);
if (body.seq_number == NULL) {
ret = krb5_enomem(context);
goto out;
}
*(body.seq_number) = auth_context->local_seqnumber;
} else
body.seq_number = NULL;
ap.enc_part.etype = auth_context->keyblock->keytype;
ap.enc_part.kvno = NULL;
if (auth_context->pfs) {
ret = _krb5_pfs_mk_rep(context, auth_context, &ap);
if (ret)
goto out;
}
ASN1_MALLOC_ENCODE(EncAPRepPart, buf, buf_size, &body, &len, ret);
if(ret)
goto out;
if (buf_size != len)
krb5_abortx(context, "internal error in ASN.1 encoder");
ret = krb5_crypto_init(context, auth_context->keyblock,
0 , &crypto);
if (ret)
goto out;
ret = krb5_encrypt (context,
crypto,
KRB5_KU_AP_REQ_ENC_PART,
buf + buf_size - len,
len,
&ap.enc_part.cipher);
if (ret)
goto out;
ASN1_MALLOC_ENCODE(AP_REP, outbuf->data, outbuf->length, &ap, &len, ret);
if (ret == 0 && outbuf->length != len)
krb5_abortx(context, "internal error in ASN.1 encoder");
out:
if (buf)
free(buf);
if (crypto)
krb5_crypto_destroy(context, crypto);
free_EncAPRepPart (&body);
free_AP_REP (&ap);
return ret;
}