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re-structure code.

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remove limits on ASN1 generated bits.


git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@5215 ec53bebd-3082-4978-b11e-865c3cabbd6b
This commit is contained in:
Assar Westerlund
1998-11-22 05:54:37 +00:00
parent 03f3050d68
commit 84f21a8ac8
1 changed files with 156 additions and 62 deletions
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218
lib/krb5/get_cred.c
View File

@@ -40,6 +40,11 @@
RCSID("$Id$");
/*
* Take the `body' and encode it into `padata' using the credentials
* in `creds'.
*/
static krb5_error_code
make_pa_tgs_req(krb5_context context,
krb5_auth_context ac,
@@ -47,15 +52,39 @@ make_pa_tgs_req(krb5_context context,
PA_DATA *padata,
krb5_creds *creds)
{
unsigned char buf[1024];
u_char *buf;
size_t buf_size;
size_t len;
krb5_data in_data;
krb5_error_code ret;
encode_KDC_REQ_BODY(buf + sizeof(buf) - 1, sizeof(buf),
body, &len);
buf_size = 1024;
buf = malloc (buf_size);
if (buf == NULL)
return ENOMEM;
do {
ret = encode_KDC_REQ_BODY(buf + buf_size - 1, buf_size,
body, &len);
if (ret){
if (ret == ASN1_OVERFLOW) {
u_char *tmp;
buf_size *= 2;
tmp = realloc (buf, buf_size);
if (tmp == NULL) {
ret = ENOMEM;
goto out;
}
buf = tmp;
} else {
goto out;
}
}
} while (ret == ASN1_OVERFLOW);
in_data.length = len;
in_data.data = buf + sizeof(buf) - len;
in_data.data = buf + buf_size - len;
{
Ticket ticket;
ret = decode_Ticket(creds->ticket.data, creds->ticket.length,
@@ -74,17 +103,89 @@ make_pa_tgs_req(krb5_context context,
}
free_Ticket(&ticket);
ret = krb5_mk_req_extended(context, &ac, 0, &in_data, creds,
&padata->padata_value);
}
out:
free (buf);
if(ret)
return ret;
padata->padata_type = pa_tgs_req;
return 0;
}
/*
*
*/
static krb5_error_code
init_tgs_req1(krb5_context context,
krb5_authdata *authdata,
krb5_creds *krbtgt,
krb5_keyblock **subkey,
TGS_REQ *t)
{
krb5_error_code ret;
krb5_auth_context ac;
krb5_keyblock *key = NULL;
ret = krb5_auth_con_init(context, &ac);
if(ret)
return ret;
ret = krb5_generate_subkey (context, &krbtgt->session, &key);
if (ret)
goto out;
ret = krb5_auth_con_setlocalsubkey(context, ac, key);
if (ret)
goto out;
if(authdata->len){
size_t len;
unsigned char *buf;
krb5_enctype etype;
len = length_AuthorizationData(authdata);
buf = malloc(len);
if (buf == NULL) {
ret = ENOMEM;
goto out;
}
ret = encode_AuthorizationData(buf + len - 1, len, authdata, &len);
ALLOC(t->req_body.enc_authorization_data, 1);
if (t->req_body.enc_authorization_data == NULL) {
free (buf);
ret = ENOMEM;
goto out;
}
krb5_keytype_to_etype(context, key->keytype, &etype);
krb5_encrypt_EncryptedData(context, buf, len, etype, 0,
key, t->req_body.enc_authorization_data);
free (buf);
} else {
t->req_body.enc_authorization_data = NULL;
}
ret = make_pa_tgs_req(context,
ac,
&t->req_body,
t->padata->val,
krbtgt);
out:
if (ret == 0)
*subkey = key;
else
krb5_free_keyblock (context, key);
krb5_auth_con_free(context, ac);
return ret;
}
/*
* Create a tgs-req in `t' with `addresses', `flags', `second_ticket'
* (if not-NULL), `in_creds', `krbtgt', and returning the generated
* subkey in `subkey'.
*/
static krb5_error_code
init_tgs_req (krb5_context context,
krb5_ccache ccache,
@@ -103,19 +204,19 @@ init_tgs_req (krb5_context context,
t->pvno = 5;
t->msg_type = krb_tgs_req;
if (in_creds->session.keytype) {
krb5_enctype *foo;
krb5_enctype *etypes;
ret = krb5_keytype_to_etypes(context,
in_creds->session.keytype,
&foo);
&etypes);
if (ret)
return ret;
ret = krb5_init_etype(context,
&t->req_body.etype.len,
&t->req_body.etype.val,
foo);
free (foo);
etypes);
free (etypes);
} else {
ret = krb5_init_etype(context,
&t->req_body.etype.len,
@@ -123,27 +224,27 @@ init_tgs_req (krb5_context context,
NULL);
}
if (ret)
goto fail;
goto out;
t->req_body.addresses = addresses;
t->req_body.kdc_options = flags.b;
ret = copy_Realm(&in_creds->server->realm, &t->req_body.realm);
if (ret)
goto fail;
goto out;
ALLOC(t->req_body.sname, 1);
if (t->req_body.sname == NULL) {
ret = ENOMEM;
goto fail;
goto out;
}
ret = copy_PrincipalName(&in_creds->server->name, t->req_body.sname);
if (ret)
goto fail;
goto out;
/* req_body.till should be NULL if there is no endtime specified,
but old MIT code (like DCE secd) doesn't like that */
ALLOC(t->req_body.till, 1);
if(t->req_body.till == NULL){
ret = ENOMEM;
goto fail;
goto out;
}
*t->req_body.till = in_creds->times.endtime;
@@ -152,68 +253,33 @@ init_tgs_req (krb5_context context,
ALLOC(t->req_body.additional_tickets, 1);
if (t->req_body.additional_tickets == NULL) {
ret = ENOMEM;
goto fail;
goto out;
}
ALLOC_SEQ(t->req_body.additional_tickets, 1);
if (t->req_body.additional_tickets->val == NULL) {
ret = ENOMEM;
goto fail;
goto out;
}
ret = copy_Ticket(second_ticket, t->req_body.additional_tickets->val);
if (ret)
goto fail;
goto out;
}
ALLOC(t->padata, 1);
if (t->padata == NULL) {
ret = ENOMEM;
goto fail;
goto out;
}
ALLOC_SEQ(t->padata, 1);
if (t->padata->val == NULL) {
ret = ENOMEM;
goto fail;
goto out;
}
{
krb5_auth_context ac;
krb5_keyblock *key;
ret = krb5_auth_con_init(context, &ac);
if(ret)
return ret;
ret = krb5_generate_subkey (context, &krbtgt->session, &key);
ret = krb5_auth_con_setlocalsubkey(context, ac, key);
if(ret == ENOMEM)
/* XXX */;
ret = init_tgs_req1 (context, &in_creds->authdata, krbtgt, subkey, t);
if(in_creds->authdata.len){
size_t len;
unsigned char *buf;
krb5_enctype etype;
len = length_AuthorizationData(&in_creds->authdata);
buf = malloc(len);
ret = encode_AuthorizationData(buf + len - 1, len, &in_creds->authdata, &len);
ALLOC(t->req_body.enc_authorization_data, 1);
krb5_keytype_to_etype(context, key->keytype, &etype);
krb5_encrypt_EncryptedData(context, buf, len, etype, 0,
key, t->req_body.enc_authorization_data);
}else
t->req_body.enc_authorization_data = NULL;
ret = make_pa_tgs_req(context,
ac,
&t->req_body,
t->padata->val,
krbtgt);
if(ret)
goto fail;
*subkey = key;
krb5_auth_con_free(context, ac);
}
return 0;
fail:
free_TGS_REQ (t);
out:
if (ret)
free_TGS_REQ (t);
return ret;
}
@@ -311,8 +377,9 @@ get_cred_kdc(krb5_context context,
KRB_ERROR error;
krb5_error_code ret;
unsigned nonce;
unsigned char buf[1024];
krb5_keyblock *subkey = NULL;
u_char *buf = NULL;
size_t buf_size;
size_t len;
Ticket second_ticket;
@@ -342,13 +409,38 @@ get_cred_kdc(krb5_context context,
if (ret)
goto out;
ret = encode_TGS_REQ (buf + sizeof (buf) - 1, sizeof(buf),
&req, &enc.length);
buf_size = 1024;
buf = malloc (buf_size);
if (buf == NULL) {
ret = ENOMEM;
goto out;
}
do {
ret = encode_TGS_REQ (buf + buf_size - 1, buf_size,
&req, &enc.length);
if (ret) {
if (ret == ASN1_OVERFLOW) {
u_char *tmp;
buf_size *= 2;
tmp = realloc (buf, buf_size);
if (tmp == NULL) {
ret = ENOMEM;
goto out;
}
buf = tmp;
} else {
goto out;
}
}
} while (ret == ASN1_OVERFLOW);
/* don't free addresses */
req.req_body.addresses = NULL;
free_TGS_REQ(&req);
enc.data = buf + sizeof(buf) - enc.length;
enc.data = buf + buf_size - enc.length;
if (ret)
goto out;
@@ -402,6 +494,8 @@ out:
krb5_free_keyblock_contents(context, subkey);
free(subkey);
}
if (buf)
free (buf);
return ret;
}