krb5_error_code KRB5_LIB_FUNCTION
krb5_get_forwarded_creds (krb5_context context,
krb5_auth_context auth_context,
krb5_ccache ccache,
krb5_flags flags,
const char *hostname,
krb5_creds *in_creds,
krb5_data *out_data)
{
krb5_error_code ret;
krb5_creds *out_creds;
krb5_addresses addrs, *paddrs;
KRB_CRED cred;
KrbCredInfo *krb_cred_info;
EncKrbCredPart enc_krb_cred_part;
size_t len;
unsigned char *buf;
size_t buf_size;
krb5_kdc_flags kdc_flags;
krb5_crypto crypto;
struct addrinfo *ai;
int save_errno;
krb5_creds *ticket;
char *realm;
realm = in_creds->client->realm;
addrs.len = 0;
addrs.val = NULL;
paddrs = &addrs;
{
krb5_boolean noaddr;
krb5_appdefault_boolean(context, NULL, realm,
"no-addresses", KRB5_ADDRESSLESS_DEFAULT,
&noaddr);
if (noaddr)
paddrs = NULL;
}
/*
* If tickets are address-less, forward address-less tickets.
*/
if (paddrs) {
ret = _krb5_get_krbtgt (context,
ccache,
realm,
&ticket);
if(ret == 0) {
if (ticket->addresses.len == 0)
paddrs = NULL;
krb5_free_creds (context, ticket);
}
}
if (paddrs != NULL) {
ret = getaddrinfo (hostname, NULL, NULL, &ai);
if (ret) {
save_errno = errno;
krb5_set_error_string(context, "resolving %s: %s",
hostname, gai_strerror(ret));
return krb5_eai_to_heim_errno(ret, save_errno);
}
ret = add_addrs (context, &addrs, ai);
freeaddrinfo (ai);
if (ret)
return ret;
}
kdc_flags.b = int2KDCOptions(flags);
ret = krb5_get_kdc_cred (context,
ccache,
kdc_flags,
paddrs,
NULL,
in_creds,
&out_creds);
krb5_free_addresses (context, &addrs);
if (ret) {
return ret;
}
memset (&cred, 0, sizeof(cred));
cred.pvno = 5;
cred.msg_type = krb_cred;
ALLOC_SEQ(&cred.tickets, 1);
if (cred.tickets.val == NULL) {
ret = ENOMEM;
krb5_set_error_string(context, "malloc: out of memory");
goto out2;
}
ret = decode_Ticket(out_creds->ticket.data,
out_creds->ticket.length,
cred.tickets.val, &len);
if (ret)
goto out3;
memset (&enc_krb_cred_part, 0, sizeof(enc_krb_cred_part));
ALLOC_SEQ(&enc_krb_cred_part.ticket_info, 1);
if (enc_krb_cred_part.ticket_info.val == NULL) {
ret = ENOMEM;
krb5_set_error_string(context, "malloc: out of memory");
goto out4;
}
if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_TIME) {
krb5_timestamp sec;
int32_t usec;
krb5_us_timeofday (context, &sec, &usec);
ALLOC(enc_krb_cred_part.timestamp, 1);
if (enc_krb_cred_part.timestamp == NULL) {
ret = ENOMEM;
krb5_set_error_string(context, "malloc: out of memory");
goto out4;
}
*enc_krb_cred_part.timestamp = sec;
ALLOC(enc_krb_cred_part.usec, 1);
if (enc_krb_cred_part.usec == NULL) {
ret = ENOMEM;
krb5_set_error_string(context, "malloc: out of memory");
goto out4;
}
*enc_krb_cred_part.usec = usec;
} else {
enc_krb_cred_part.timestamp = NULL;
enc_krb_cred_part.usec = NULL;
}
if (auth_context->local_address && auth_context->local_port && paddrs) {
ret = krb5_make_addrport (context,
&enc_krb_cred_part.s_address,
auth_context->local_address,
auth_context->local_port);
if (ret)
goto out4;
}
if (auth_context->remote_address) {
if (auth_context->remote_port) {
krb5_boolean noaddr;
krb5_const_realm srealm;
srealm = krb5_principal_get_realm(context, out_creds->server);
/* Is this correct, and should we use the paddrs == NULL
trick here as well? Having an address-less ticket may
indicate that we don't know our own global address, but
it does not necessary mean that we don't know the
server's. */
krb5_appdefault_boolean(context, NULL, srealm, "no-addresses",
FALSE, &noaddr);
if (!noaddr) {
ret = krb5_make_addrport (context,
&enc_krb_cred_part.r_address,
auth_context->remote_address,
auth_context->remote_port);
if (ret)
goto out4;
}
} else {
ALLOC(enc_krb_cred_part.r_address, 1);
if (enc_krb_cred_part.r_address == NULL) {
ret = ENOMEM;
krb5_set_error_string(context, "malloc: out of memory");
goto out4;
}
ret = krb5_copy_address (context, auth_context->remote_address,
enc_krb_cred_part.r_address);
if (ret)
goto out4;
}
}
/* fill ticket_info.val[0] */
enc_krb_cred_part.ticket_info.len = 1;
krb_cred_info = enc_krb_cred_part.ticket_info.val;
copy_EncryptionKey (&out_creds->session, &krb_cred_info->key);
ALLOC(krb_cred_info->prealm, 1);
copy_Realm (&out_creds->client->realm, krb_cred_info->prealm);
ALLOC(krb_cred_info->pname, 1);
copy_PrincipalName(&out_creds->client->name, krb_cred_info->pname);
ALLOC(krb_cred_info->flags, 1);
*krb_cred_info->flags = out_creds->flags.b;
ALLOC(krb_cred_info->authtime, 1);
*krb_cred_info->authtime = out_creds->times.authtime;
ALLOC(krb_cred_info->starttime, 1);
*krb_cred_info->starttime = out_creds->times.starttime;
ALLOC(krb_cred_info->endtime, 1);
*krb_cred_info->endtime = out_creds->times.endtime;
ALLOC(krb_cred_info->renew_till, 1);
*krb_cred_info->renew_till = out_creds->times.renew_till;
ALLOC(krb_cred_info->srealm, 1);
copy_Realm (&out_creds->server->realm, krb_cred_info->srealm);
ALLOC(krb_cred_info->sname, 1);
copy_PrincipalName (&out_creds->server->name, krb_cred_info->sname);
ALLOC(krb_cred_info->caddr, 1);
copy_HostAddresses (&out_creds->addresses, krb_cred_info->caddr);
krb5_free_creds (context, out_creds);
/* encode EncKrbCredPart */
ASN1_MALLOC_ENCODE(EncKrbCredPart, buf, buf_size,
&enc_krb_cred_part, &len, ret);
free_EncKrbCredPart (&enc_krb_cred_part);
if (ret) {
free_KRB_CRED(&cred);
return ret;
}
if(buf_size != len)
krb5_abortx(context, "internal error in ASN.1 encoder");
if (auth_context->flags & KRB5_AUTH_CONTEXT_CLEAR_FORWARDED_CRED) {
cred.enc_part.etype = ENCTYPE_NULL;
cred.enc_part.kvno = NULL;
cred.enc_part.cipher.data = buf;
cred.enc_part.cipher.length = buf_size;
} else {
/*
* Here older versions then 0.7.2 of Heimdal used the local or
* remote subkey. That is wrong, the session key should be
* used. Heimdal 0.7.2 and newer have code to try both in the
* receiving end.
*/
ret = krb5_crypto_init(context, auth_context->keyblock, 0, &crypto);
if (ret) {
free(buf);
free_KRB_CRED(&cred);
return ret;
}
ret = krb5_encrypt_EncryptedData (context,
crypto,
KRB5_KU_KRB_CRED,
buf,
len,
0,
&cred.enc_part);
free(buf);
krb5_crypto_destroy(context, crypto);
if (ret) {
free_KRB_CRED(&cred);
return ret;
}
}
ASN1_MALLOC_ENCODE(KRB_CRED, buf, buf_size, &cred, &len, ret);
free_KRB_CRED (&cred);
if (ret)
return ret;
if(buf_size != len)
krb5_abortx(context, "internal error in ASN.1 encoder");
out_data->length = len;
out_data->data = buf;
return 0;
out4:
free_EncKrbCredPart(&enc_krb_cred_part);
out3:
free_KRB_CRED(&cred);
out2:
krb5_free_creds (context, out_creds);
return ret;
}
static krb5_error_code
init_tgs_req (krb5_context context,
krb5_ccache ccache,
krb5_addresses *addresses,
krb5_kdc_flags flags,
Ticket *second_ticket,
krb5_creds *in_creds,
krb5_creds *krbtgt,
unsigned nonce,
const METHOD_DATA *padata,
krb5_keyblock **subkey,
TGS_REQ *t,
krb5_key_usage usage)
{
krb5_error_code ret = 0;
memset(t, 0, sizeof(*t));
t->pvno = 5;
t->msg_type = krb_tgs_req;
if (in_creds->session.keytype) {
ALLOC_SEQ(&t->req_body.etype, 1);
if(t->req_body.etype.val == NULL) {
ret = ENOMEM;
krb5_set_error_string(context, "malloc: out of memory");
goto fail;
}
t->req_body.etype.val[0] = in_creds->session.keytype;
} else {
ret = krb5_init_etype(context,
&t->req_body.etype.len,
&t->req_body.etype.val,
NULL);
}
if (ret)
goto fail;
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;
ALLOC(t->req_body.sname, 1);
if (t->req_body.sname == NULL) {
ret = ENOMEM;
krb5_set_error_string(context, "malloc: out of memory");
goto fail;
}
/* some versions of some code might require that the client be
present in TGS-REQs, but this is clearly against the spec */
ret = copy_PrincipalName(&in_creds->server->name, t->req_body.sname);
if (ret)
goto fail;
/* 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;
krb5_set_error_string(context, "malloc: out of memory");
goto fail;
}
*t->req_body.till = in_creds->times.endtime;
t->req_body.nonce = nonce;
if(second_ticket){
ALLOC(t->req_body.additional_tickets, 1);
if (t->req_body.additional_tickets == NULL) {
ret = ENOMEM;
krb5_set_error_string(context, "malloc: out of memory");
goto fail;
}
ALLOC_SEQ(t->req_body.additional_tickets, 1);
if (t->req_body.additional_tickets->val == NULL) {
ret = ENOMEM;
krb5_set_error_string(context, "malloc: out of memory");
goto fail;
}
ret = copy_Ticket(second_ticket, t->req_body.additional_tickets->val);
if (ret)
goto fail;
}
ALLOC(t->padata, 1);
if (t->padata == NULL) {
ret = ENOMEM;
krb5_set_error_string(context, "malloc: out of memory");
goto fail;
}
ALLOC_SEQ(t->padata, 1 + padata->len);
if (t->padata->val == NULL) {
ret = ENOMEM;
krb5_set_error_string(context, "malloc: out of memory");
goto fail;
}
{
int i;
for (i = 0; i < padata->len; i++) {
ret = copy_PA_DATA(&padata->val[i], &t->padata->val[i + 1]);
if (ret) {
krb5_set_error_string(context, "malloc: out of memory");
goto fail;
}
}
}
{
krb5_auth_context ac;
krb5_keyblock *key = NULL;
ret = krb5_auth_con_init(context, &ac);
if(ret)
goto fail;
if (krb5_config_get_bool_default(context, NULL, FALSE,
"realms",
krbtgt->server->realm,
"tgs_require_subkey",
NULL))
{
ret = krb5_generate_subkey (context, &krbtgt->session, &key);
if (ret) {
krb5_auth_con_free (context, ac);
goto fail;
}
ret = krb5_auth_con_setlocalsubkey(context, ac, key);
if (ret) {
if (key)
krb5_free_keyblock (context, key);
krb5_auth_con_free (context, ac);
goto fail;
}
}
ret = set_auth_data (context, &t->req_body, &in_creds->authdata,
key ? key : &krbtgt->session);
if (ret) {
if (key)
krb5_free_keyblock (context, key);
krb5_auth_con_free (context, ac);
goto fail;
}
ret = make_pa_tgs_req(context,
ac,
&t->req_body,
&t->padata->val[0],
krbtgt,
usage);
if(ret) {
if (key)
krb5_free_keyblock (context, key);
krb5_auth_con_free(context, ac);
goto fail;
}
*subkey = key;
krb5_auth_con_free(context, ac);
}
fail:
if (ret) {
t->req_body.addresses = NULL;
free_TGS_REQ (t);
}
return ret;
}
static krb5_error_code
init_as_req (krb5_context context,
KDCOptions opts,
const krb5_creds *creds,
const krb5_addresses *addrs,
const krb5_enctype *etypes,
AS_REQ *a)
{
krb5_error_code ret;
memset(a, 0, sizeof(*a));
a->pvno = 5;
a->msg_type = krb_as_req;
a->req_body.kdc_options = opts;
a->req_body.cname = malloc(sizeof(*a->req_body.cname));
if (a->req_body.cname == NULL) {
ret = ENOMEM;
krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
goto fail;
}
a->req_body.sname = malloc(sizeof(*a->req_body.sname));
if (a->req_body.sname == NULL) {
ret = ENOMEM;
krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
goto fail;
}
ret = _krb5_principal2principalname (a->req_body.cname, creds->client);
if (ret)
goto fail;
ret = copy_Realm(&creds->client->realm, &a->req_body.realm);
if (ret)
goto fail;
ret = _krb5_principal2principalname (a->req_body.sname, creds->server);
if (ret)
goto fail;
if(creds->times.starttime) {
a->req_body.from = malloc(sizeof(*a->req_body.from));
if (a->req_body.from == NULL) {
ret = ENOMEM;
krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
goto fail;
}
*a->req_body.from = creds->times.starttime;
}
if(creds->times.endtime){
ALLOC(a->req_body.till, 1);
*a->req_body.till = creds->times.endtime;
}
if(creds->times.renew_till){
a->req_body.rtime = malloc(sizeof(*a->req_body.rtime));
if (a->req_body.rtime == NULL) {
ret = ENOMEM;
krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
goto fail;
}
*a->req_body.rtime = creds->times.renew_till;
}
a->req_body.nonce = 0;
ret = krb5_init_etype (context,
&a->req_body.etype.len,
&a->req_body.etype.val,
etypes);
if (ret)
goto fail;
/*
* This means no addresses
*/
if (addrs && addrs->len == 0) {
a->req_body.addresses = NULL;
} else {
a->req_body.addresses = malloc(sizeof(*a->req_body.addresses));
if (a->req_body.addresses == NULL) {
ret = ENOMEM;
krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
goto fail;
}
if (addrs)
ret = krb5_copy_addresses(context, addrs, a->req_body.addresses);
else {
ret = krb5_get_all_client_addrs (context, a->req_body.addresses);
if(ret == 0 && a->req_body.addresses->len == 0) {
free(a->req_body.addresses);
a->req_body.addresses = NULL;
}
}
if (ret)
goto fail;
}
a->req_body.enc_authorization_data = NULL;
a->req_body.additional_tickets = NULL;
a->padata = NULL;
return 0;
fail:
free_AS_REQ(a);
memset(a, 0, sizeof(*a));
return ret;
}
static krb5_error_code
init_as_req (krb5_context context,
KDCOptions opts,
krb5_creds *creds,
const krb5_addresses *addrs,
const krb5_enctype *etypes,
const krb5_preauthtype *ptypes,
const krb5_preauthdata *preauth,
krb5_key_proc key_proc,
krb5_const_pointer keyseed,
unsigned nonce,
AS_REQ *a)
{
krb5_error_code ret;
krb5_salt salt;
memset(a, 0, sizeof(*a));
a->pvno = 5;
a->msg_type = krb_as_req;
a->req_body.kdc_options = opts;
a->req_body.cname = malloc(sizeof(*a->req_body.cname));
if (a->req_body.cname == NULL) {
ret = ENOMEM;
krb5_set_error_string(context, "malloc: out of memory");
goto fail;
}
a->req_body.sname = malloc(sizeof(*a->req_body.sname));
if (a->req_body.sname == NULL) {
ret = ENOMEM;
krb5_set_error_string(context, "malloc: out of memory");
goto fail;
}
ret = _krb5_principal2principalname (a->req_body.cname, creds->client);
if (ret)
goto fail;
ret = _krb5_principal2principalname (a->req_body.sname, creds->server);
if (ret)
goto fail;
ret = copy_Realm(&creds->client->realm, &a->req_body.realm);
if (ret)
goto fail;
if(creds->times.starttime) {
a->req_body.from = malloc(sizeof(*a->req_body.from));
if (a->req_body.from == NULL) {
ret = ENOMEM;
krb5_set_error_string(context, "malloc: out of memory");
goto fail;
}
*a->req_body.from = creds->times.starttime;
}
if(creds->times.endtime){
ALLOC(a->req_body.till, 1);
*a->req_body.till = creds->times.endtime;
}
if(creds->times.renew_till){
a->req_body.rtime = malloc(sizeof(*a->req_body.rtime));
if (a->req_body.rtime == NULL) {
ret = ENOMEM;
krb5_set_error_string(context, "malloc: out of memory");
goto fail;
}
*a->req_body.rtime = creds->times.renew_till;
}
a->req_body.nonce = nonce;
ret = krb5_init_etype (context,
&a->req_body.etype.len,
&a->req_body.etype.val,
etypes);
if (ret)
goto fail;
/*
* This means no addresses
*/
if (addrs && addrs->len == 0) {
a->req_body.addresses = NULL;
} else {
a->req_body.addresses = malloc(sizeof(*a->req_body.addresses));
if (a->req_body.addresses == NULL) {
ret = ENOMEM;
krb5_set_error_string(context, "malloc: out of memory");
goto fail;
}
if (addrs)
ret = krb5_copy_addresses(context, addrs, a->req_body.addresses);
else {
ret = krb5_get_all_client_addrs (context, a->req_body.addresses);
if(ret == 0 && a->req_body.addresses->len == 0) {
free(a->req_body.addresses);
a->req_body.addresses = NULL;
}
}
if (ret)
return ret;
}
a->req_body.enc_authorization_data = NULL;
a->req_body.additional_tickets = NULL;
if(preauth != NULL) {
int i;
ALLOC(a->padata, 1);
if(a->padata == NULL) {
ret = ENOMEM;
krb5_set_error_string(context, "malloc: out of memory");
goto fail;
}
a->padata->val = NULL;
a->padata->len = 0;
for(i = 0; i < preauth->len; i++) {
if(preauth->val[i].type == KRB5_PADATA_ENC_TIMESTAMP){
int j;
for(j = 0; j < preauth->val[i].info.len; j++) {
krb5_salt *sp = &salt;
if(preauth->val[i].info.val[j].salttype)
salt.salttype = *preauth->val[i].info.val[j].salttype;
else
salt.salttype = KRB5_PW_SALT;
if(preauth->val[i].info.val[j].salt)
salt.saltvalue = *preauth->val[i].info.val[j].salt;
else
if(salt.salttype == KRB5_PW_SALT)
sp = NULL;
else
krb5_data_zero(&salt.saltvalue);
ret = add_padata(context, a->padata, creds->client,
key_proc, keyseed,
&preauth->val[i].info.val[j].etype, 1,
sp);
if (ret == 0)
break;
}
}
}
} else
/* not sure this is the way to use `ptypes' */
if (ptypes == NULL || *ptypes == KRB5_PADATA_NONE)
a->padata = NULL;
else if (*ptypes == KRB5_PADATA_ENC_TIMESTAMP) {
ALLOC(a->padata, 1);
if (a->padata == NULL) {
ret = ENOMEM;
krb5_set_error_string(context, "malloc: out of memory");
goto fail;
}
a->padata->len = 0;
a->padata->val = NULL;
/* make a v5 salted pa-data */
add_padata(context, a->padata, creds->client,
key_proc, keyseed, a->req_body.etype.val,
a->req_body.etype.len, NULL);
/* make a v4 salted pa-data */
salt.salttype = KRB5_PW_SALT;
krb5_data_zero(&salt.saltvalue);
add_padata(context, a->padata, creds->client,
key_proc, keyseed, a->req_body.etype.val,
a->req_body.etype.len, &salt);
} else {
krb5_set_error_string (context, "pre-auth type %d not supported",
*ptypes);
ret = KRB5_PREAUTH_BAD_TYPE;
goto fail;
}
return 0;
fail:
free_AS_REQ(a);
return ret;
}
