/*
parse a krb5 GSS-API wrapper packet giving a ticket
*/
BOOL spnego_parse_krb5_wrap(DATA_BLOB blob, DATA_BLOB *ticket, uint8 tok_id[2])
{
BOOL ret;
ASN1_DATA data;
int data_remaining;
asn1_load(&data, blob);
asn1_start_tag(&data, ASN1_APPLICATION(0));
asn1_check_OID(&data, OID_KERBEROS5);
data_remaining = asn1_tag_remaining(&data);
if (data_remaining < 3) {
data.has_error = True;
} else {
asn1_read(&data, tok_id, 2);
data_remaining -= 2;
*ticket = data_blob(NULL, data_remaining);
asn1_read(&data, ticket->data, ticket->length);
}
asn1_end_tag(&data);
ret = !data.has_error;
asn1_free(&data);
return ret;
}
/*
parse a krb5 GSS-API wrapper packet giving a ticket
*/
static bool gensec_gssapi_parse_krb5_wrap(TALLOC_CTX *mem_ctx, const DATA_BLOB *blob, DATA_BLOB *ticket, uint8_t tok_id[2])
{
bool ret;
struct asn1_data *data = asn1_init(mem_ctx);
int data_remaining;
if (!data) {
return false;
}
asn1_load(data, *blob);
asn1_start_tag(data, ASN1_APPLICATION(0));
asn1_check_OID(data, GENSEC_OID_KERBEROS5);
data_remaining = asn1_tag_remaining(data);
if (data_remaining < 3) {
data->has_error = true;
} else {
asn1_read(data, tok_id, 2);
data_remaining -= 2;
*ticket = data_blob_talloc(mem_ctx, NULL, data_remaining);
asn1_read(data, ticket->data, ticket->length);
}
asn1_end_tag(data);
ret = !data->has_error;
asn1_free(data);
return ret;
}
ssize_t read_spnego_data(DATA_BLOB data, SPNEGO_DATA *token)
{
ASN1_DATA asn1;
ssize_t ret = -1;
ZERO_STRUCTP(token);
ZERO_STRUCT(asn1);
asn1_load(&asn1, data);
switch (asn1.data[asn1.ofs]) {
case ASN1_APPLICATION(0):
asn1_start_tag(&asn1, ASN1_APPLICATION(0));
asn1_check_OID(&asn1, OID_SPNEGO);
if (read_negTokenInit(&asn1, &token->negTokenInit)) {
token->type = SPNEGO_NEG_TOKEN_INIT;
}
asn1_end_tag(&asn1);
break;
case ASN1_CONTEXT(1):
if (read_negTokenTarg(&asn1, &token->negTokenTarg)) {
token->type = SPNEGO_NEG_TOKEN_TARG;
}
break;
default:
break;
}
if (!asn1.has_error) ret = asn1.ofs;
asn1_free(&asn1);
return ret;
}
/*
decode/process data
*/
static NTSTATUS ldapsrv_decode(void *private_data, DATA_BLOB blob)
{
NTSTATUS status;
struct ldapsrv_connection *conn = talloc_get_type(private_data,
struct ldapsrv_connection);
struct asn1_data *asn1 = asn1_init(conn);
struct ldap_message *msg = talloc(conn, struct ldap_message);
if (asn1 == NULL || msg == NULL) {
return NT_STATUS_NO_MEMORY;
}
if (!asn1_load(asn1, blob)) {
talloc_free(msg);
talloc_free(asn1);
return NT_STATUS_NO_MEMORY;
}
status = ldap_decode(asn1, samba_ldap_control_handlers(), msg);
if (!NT_STATUS_IS_OK(status)) {
asn1_free(asn1);
return status;
}
data_blob_free(&blob);
talloc_steal(conn, msg);
asn1_free(asn1);
ldapsrv_process_message(conn, msg);
return NT_STATUS_OK;
}
/*
parse a spnego NTLMSSP challenge packet giving two security blobs
*/
bool spnego_parse_challenge(TALLOC_CTX *ctx, const DATA_BLOB blob,
DATA_BLOB *chal1, DATA_BLOB *chal2)
{
bool ret = false;
ASN1_DATA *data;
ZERO_STRUCTP(chal1);
ZERO_STRUCTP(chal2);
data = asn1_init(talloc_tos());
if (data == NULL) {
return false;
}
if (!asn1_load(data, blob)) goto err;
if (!asn1_start_tag(data,ASN1_CONTEXT(1))) goto err;
if (!asn1_start_tag(data,ASN1_SEQUENCE(0))) goto err;
if (!asn1_start_tag(data,ASN1_CONTEXT(0))) goto err;
if (!asn1_check_enumerated(data,1)) goto err;
if (!asn1_end_tag(data)) goto err;
if (!asn1_start_tag(data,ASN1_CONTEXT(1))) goto err;
if (!asn1_check_OID(data, OID_NTLMSSP)) goto err;
if (!asn1_end_tag(data)) goto err;
if (!asn1_start_tag(data,ASN1_CONTEXT(2))) goto err;
if (!asn1_read_OctetString(data, ctx, chal1)) goto err;
if (!asn1_end_tag(data)) goto err;
/* the second challenge is optional (XP doesn't send it) */
if (asn1_tag_remaining(data)) {
if (!asn1_start_tag(data,ASN1_CONTEXT(3))) goto err;
if (!asn1_read_OctetString(data, ctx, chal2)) goto err;
if (!asn1_end_tag(data)) goto err;
}
if (!asn1_end_tag(data)) goto err;
if (!asn1_end_tag(data)) goto err;
ret = !asn1_has_error(data);
err:
if (asn1_has_error(data)) {
data_blob_free(chal1);
data_blob_free(chal2);
}
asn1_free(data);
return ret;
}
ssize_t spnego_read_data(TALLOC_CTX *mem_ctx, DATA_BLOB data, struct spnego_data *token)
{
struct asn1_data *asn1;
ssize_t ret = -1;
uint8_t context;
ZERO_STRUCTP(token);
if (data.length == 0) {
return ret;
}
asn1 = asn1_init(mem_ctx);
if (asn1 == NULL) {
return -1;
}
asn1_load(asn1, data);
if (!asn1_peek_uint8(asn1, &context)) {
asn1->has_error = true;
} else {
switch (context) {
case ASN1_APPLICATION(0):
asn1_start_tag(asn1, ASN1_APPLICATION(0));
asn1_check_OID(asn1, GENSEC_OID_SPNEGO);
if (read_negTokenInit(asn1, mem_ctx, &token->negTokenInit)) {
token->type = SPNEGO_NEG_TOKEN_INIT;
}
asn1_end_tag(asn1);
break;
case ASN1_CONTEXT(1):
if (read_negTokenTarg(asn1, mem_ctx, &token->negTokenTarg)) {
token->type = SPNEGO_NEG_TOKEN_TARG;
}
break;
default:
asn1->has_error = true;
break;
}
}
if (!asn1->has_error) ret = asn1->ofs;
asn1_free(asn1);
return ret;
}
/*
magic check a GSS-API wrapper packet for an Kerberos OID
*/
static bool gensec_gssapi_check_oid(const DATA_BLOB *blob, const char *oid)
{
bool ret;
struct asn1_data *data = asn1_init(NULL);
if (!data) return false;
asn1_load(data, *blob);
asn1_start_tag(data, ASN1_APPLICATION(0));
asn1_check_OID(data, oid);
ret = !data->has_error;
asn1_free(data);
return ret;
}
/*
parse a SPNEGO NTLMSSP auth packet. This contains the encrypted passwords
*/
BOOL spnego_parse_auth_response(DATA_BLOB blob, NTSTATUS nt_status,
DATA_BLOB *auth)
{
ASN1_DATA data;
uint8 negResult;
if (NT_STATUS_IS_OK(nt_status)) {
negResult = SPNEGO_NEG_RESULT_ACCEPT;
} else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
negResult = SPNEGO_NEG_RESULT_INCOMPLETE;
} else {
negResult = SPNEGO_NEG_RESULT_REJECT;
}
asn1_load(&data, blob);
asn1_start_tag(&data, ASN1_CONTEXT(1));
asn1_start_tag(&data, ASN1_SEQUENCE(0));
asn1_start_tag(&data, ASN1_CONTEXT(0));
asn1_check_enumerated(&data, negResult);
asn1_end_tag(&data);
if (negResult == SPNEGO_NEG_RESULT_INCOMPLETE) {
asn1_start_tag(&data,ASN1_CONTEXT(1));
asn1_check_OID(&data, OID_NTLMSSP);
asn1_end_tag(&data);
asn1_start_tag(&data,ASN1_CONTEXT(2));
asn1_read_OctetString(&data, auth);
asn1_end_tag(&data);
}
asn1_end_tag(&data);
asn1_end_tag(&data);
if (data.has_error) {
DEBUG(3,("spnego_parse_auth_response failed at %d\n", (int)data.ofs));
asn1_free(&data);
data_blob_free(auth);
return False;
}
asn1_free(&data);
return True;
}
/*
parse a negTokenInit packet giving a GUID, a list of supported
OIDs (the mechanisms) and a principal name string
*/
BOOL spnego_parse_negTokenInit(DATA_BLOB blob,
char *OIDs[ASN1_MAX_OIDS],
char **principal)
{
int i;
BOOL ret;
ASN1_DATA data;
asn1_load(&data, blob);
asn1_start_tag(&data,ASN1_APPLICATION(0));
asn1_check_OID(&data,OID_SPNEGO);
asn1_start_tag(&data,ASN1_CONTEXT(0));
asn1_start_tag(&data,ASN1_SEQUENCE(0));
asn1_start_tag(&data,ASN1_CONTEXT(0));
asn1_start_tag(&data,ASN1_SEQUENCE(0));
for (i=0; asn1_tag_remaining(&data) > 0 && i < ASN1_MAX_OIDS; i++) {
char *oid_str = NULL;
asn1_read_OID(&data,&oid_str);
OIDs[i] = oid_str;
}
OIDs[i] = NULL;
asn1_end_tag(&data);
asn1_end_tag(&data);
asn1_start_tag(&data, ASN1_CONTEXT(3));
asn1_start_tag(&data, ASN1_SEQUENCE(0));
asn1_start_tag(&data, ASN1_CONTEXT(0));
asn1_read_GeneralString(&data,principal);
asn1_end_tag(&data);
asn1_end_tag(&data);
asn1_end_tag(&data);
asn1_end_tag(&data);
asn1_end_tag(&data);
asn1_end_tag(&data);
ret = !data.has_error;
asn1_free(&data);
return ret;
}
/*
parse a negTokenTarg packet giving a list of OIDs and a security blob
*/
BOOL parse_negTokenTarg(DATA_BLOB blob, char *OIDs[ASN1_MAX_OIDS], DATA_BLOB *secblob)
{
int i;
ASN1_DATA data;
asn1_load(&data, blob);
asn1_start_tag(&data, ASN1_APPLICATION(0));
asn1_check_OID(&data,OID_SPNEGO);
asn1_start_tag(&data, ASN1_CONTEXT(0));
asn1_start_tag(&data, ASN1_SEQUENCE(0));
asn1_start_tag(&data, ASN1_CONTEXT(0));
asn1_start_tag(&data, ASN1_SEQUENCE(0));
for (i=0; asn1_tag_remaining(&data) > 0 && i < ASN1_MAX_OIDS; i++) {
char *oid_str = NULL;
asn1_read_OID(&data,&oid_str);
OIDs[i] = oid_str;
}
OIDs[i] = NULL;
asn1_end_tag(&data);
asn1_end_tag(&data);
asn1_start_tag(&data, ASN1_CONTEXT(2));
asn1_read_OctetString(&data,secblob);
asn1_end_tag(&data);
asn1_end_tag(&data);
asn1_end_tag(&data);
asn1_end_tag(&data);
if (data.has_error) {
DEBUG(1,("Failed to parse negTokenTarg at offset %d\n", (int)data.ofs));
asn1_free(&data);
return False;
}
asn1_free(&data);
return True;
}
/*
parse a spnego NTLMSSP challenge packet giving two security blobs
*/
BOOL spnego_parse_challenge(const DATA_BLOB blob,
DATA_BLOB *chal1, DATA_BLOB *chal2)
{
BOOL ret;
ASN1_DATA data;
ZERO_STRUCTP(chal1);
ZERO_STRUCTP(chal2);
asn1_load(&data, blob);
asn1_start_tag(&data,ASN1_CONTEXT(1));
asn1_start_tag(&data,ASN1_SEQUENCE(0));
asn1_start_tag(&data,ASN1_CONTEXT(0));
asn1_check_enumerated(&data,1);
asn1_end_tag(&data);
asn1_start_tag(&data,ASN1_CONTEXT(1));
asn1_check_OID(&data, OID_NTLMSSP);
asn1_end_tag(&data);
asn1_start_tag(&data,ASN1_CONTEXT(2));
asn1_read_OctetString(&data, chal1);
asn1_end_tag(&data);
/* the second challenge is optional (XP doesn't send it) */
if (asn1_tag_remaining(&data)) {
asn1_start_tag(&data,ASN1_CONTEXT(3));
asn1_read_OctetString(&data, chal2);
asn1_end_tag(&data);
}
asn1_end_tag(&data);
asn1_end_tag(&data);
ret = !data.has_error;
asn1_free(&data);
return ret;
}
/*
parse a SPNEGO auth packet. This contains the encrypted passwords
*/
BOOL spnego_parse_auth(DATA_BLOB blob, DATA_BLOB *auth)
{
ASN1_DATA data;
asn1_load(&data, blob);
asn1_start_tag(&data, ASN1_CONTEXT(1));
asn1_start_tag(&data, ASN1_SEQUENCE(0));
asn1_start_tag(&data, ASN1_CONTEXT(2));
asn1_read_OctetString(&data,auth);
asn1_end_tag(&data);
asn1_end_tag(&data);
asn1_end_tag(&data);
if (data.has_error) {
DEBUG(3,("spnego_parse_auth failed at %d\n", (int)data.ofs));
asn1_free(&data);
return False;
}
asn1_free(&data);
return True;
}
/*
parse a krb5 GSS-API wrapper packet giving a ticket
*/
bool spnego_parse_krb5_wrap(TALLOC_CTX *ctx, DATA_BLOB blob, DATA_BLOB *ticket, uint8 tok_id[2])
{
bool ret;
ASN1_DATA *data;
int data_remaining;
data = asn1_init(talloc_tos());
if (data == NULL) {
return false;
}
asn1_load(data, blob);
asn1_start_tag(data, ASN1_APPLICATION(0));
asn1_check_OID(data, OID_KERBEROS5);
data_remaining = asn1_tag_remaining(data);
if (data_remaining < 3) {
data->has_error = True;
} else {
asn1_read(data, tok_id, 2);
data_remaining -= 2;
*ticket = data_blob_talloc(ctx, NULL, data_remaining);
asn1_read(data, ticket->data, ticket->length);
}
asn1_end_tag(data);
ret = !data->has_error;
if (data->has_error) {
data_blob_free(ticket);
}
asn1_free(data);
return ret;
}
BOOL unwrap_pac(TALLOC_CTX *mem_ctx, DATA_BLOB *auth_data, DATA_BLOB *unwrapped_pac_data)
{
DATA_BLOB pac_contents;
ASN1_DATA data;
int data_type;
if (!auth_data->length) {
return False;
}
asn1_load(&data, *auth_data);
asn1_start_tag(&data, ASN1_SEQUENCE(0));
asn1_start_tag(&data, ASN1_SEQUENCE(0));
asn1_start_tag(&data, ASN1_CONTEXT(0));
asn1_read_Integer(&data, &data_type);
if (data_type != KRB5_AUTHDATA_WIN2K_PAC ) {
DEBUG(10,("authorization data is not a Windows PAC (type: %d)\n", data_type));
asn1_free(&data);
return False;
}
asn1_end_tag(&data);
asn1_start_tag(&data, ASN1_CONTEXT(1));
asn1_read_OctetString(&data, &pac_contents);
asn1_end_tag(&data);
asn1_end_tag(&data);
asn1_end_tag(&data);
asn1_free(&data);
*unwrapped_pac_data = data_blob_talloc(mem_ctx, pac_contents.data, pac_contents.length);
data_blob_free(&pac_contents);
return True;
}
static NTSTATUS check_spnego_blob_complete(uint16 smbpid, uint16 vuid, DATA_BLOB *pblob)
{
struct pending_auth_data *pad = NULL;
ASN1_DATA data;
size_t needed_len = 0;
pad = get_pending_auth_data(smbpid);
/* Ensure we have some data. */
if (pblob->length == 0) {
/* Caller can cope. */
DEBUG(2,("check_spnego_blob_complete: zero blob length !\n"));
delete_partial_auth(pad);
return NT_STATUS_OK;
}
/* Were we waiting for more data ? */
if (pad) {
DATA_BLOB tmp_blob;
size_t copy_len = MIN(65536, pblob->length);
/* Integer wrap paranoia.... */
if (pad->partial_data.length + copy_len < pad->partial_data.length ||
pad->partial_data.length + copy_len < copy_len) {
DEBUG(2,("check_spnego_blob_complete: integer wrap "
"pad->partial_data.length = %u, "
"copy_len = %u\n",
(unsigned int)pad->partial_data.length,
(unsigned int)copy_len ));
delete_partial_auth(pad);
return NT_STATUS_INVALID_PARAMETER;
}
DEBUG(10,("check_spnego_blob_complete: "
"pad->partial_data.length = %u, "
"pad->needed_len = %u, "
"copy_len = %u, "
"pblob->length = %u,\n",
(unsigned int)pad->partial_data.length,
(unsigned int)pad->needed_len,
(unsigned int)copy_len,
(unsigned int)pblob->length ));
tmp_blob = data_blob(NULL,
pad->partial_data.length + copy_len);
/* Concatenate the two (up to copy_len) bytes. */
memcpy(tmp_blob.data,
pad->partial_data.data,
pad->partial_data.length);
memcpy(tmp_blob.data + pad->partial_data.length,
pblob->data,
copy_len);
/* Replace the partial data. */
data_blob_free(&pad->partial_data);
pad->partial_data = tmp_blob;
ZERO_STRUCT(tmp_blob);
/* Are we done ? */
if (pblob->length >= pad->needed_len) {
/* Yes, replace pblob. */
data_blob_free(pblob);
*pblob = pad->partial_data;
ZERO_STRUCT(pad->partial_data);
delete_partial_auth(pad);
return NT_STATUS_OK;
}
/* Still need more data. */
pad->needed_len -= copy_len;
return NT_STATUS_MORE_PROCESSING_REQUIRED;
}
if ((pblob->data[0] != ASN1_APPLICATION(0)) &&
(pblob->data[0] != ASN1_CONTEXT(1))) {
/* Not something we can determine the
* length of.
*/
return NT_STATUS_OK;
}
/* This is a new SPNEGO sessionsetup - see if
* the data given in this blob is enough.
*/
asn1_load(&data, *pblob);
asn1_start_tag(&data, pblob->data[0]);
if (data.has_error || data.nesting == NULL) {
asn1_free(&data);
/* Let caller catch. */
return NT_STATUS_OK;
}
/* Integer wrap paranoia.... */
if (data.nesting->taglen + data.nesting->start < data.nesting->taglen ||
data.nesting->taglen + data.nesting->start < data.nesting->start) {
DEBUG(2,("check_spnego_blob_complete: integer wrap "
"data.nesting->taglen = %u, "
"data.nesting->start = %u\n",
(unsigned int)data.nesting->taglen,
(unsigned int)data.nesting->start ));
asn1_free(&data);
return NT_STATUS_INVALID_PARAMETER;
}
/* Total length of the needed asn1 is the tag length
* plus the current offset. */
needed_len = data.nesting->taglen + data.nesting->start;
asn1_free(&data);
DEBUG(10,("check_spnego_blob_complete: needed_len = %u, "
"pblob->length = %u\n",
(unsigned int)needed_len,
(unsigned int)pblob->length ));
if (needed_len <= pblob->length) {
/* Nothing to do - blob is complete. */
return NT_STATUS_OK;
}
/* Refuse the blob if it's bigger than 64k. */
if (needed_len > 65536) {
DEBUG(2,("check_spnego_blob_complete: needed_len too large (%u)\n",
(unsigned int)needed_len ));
return NT_STATUS_INVALID_PARAMETER;
}
/* We must store this blob until complete. */
pad = SMB_MALLOC(sizeof(struct pending_auth_data));
if (!pad) {
return NT_STATUS_NO_MEMORY;
}
pad->needed_len = needed_len - pblob->length;
pad->partial_data = data_blob(pblob->data, pblob->length);
if (pad->partial_data.data == NULL) {
SAFE_FREE(pad);
return NT_STATUS_NO_MEMORY;
}
pad->smbpid = smbpid;
pad->vuid = vuid;
DLIST_ADD(pd_list, pad);
return NT_STATUS_MORE_PROCESSING_REQUIRED;
}
/*
receive a cldap netlogon reply
*/
static int recv_cldap_netlogon(TALLOC_CTX *mem_ctx,
int sock,
uint32_t *nt_version,
union nbt_cldap_netlogon **reply)
{
int ret;
ASN1_DATA data;
DATA_BLOB blob = data_blob_null;
DATA_BLOB os1 = data_blob_null;
DATA_BLOB os2 = data_blob_null;
DATA_BLOB os3 = data_blob_null;
int i1;
/* half the time of a regular ldap timeout, not less than 3 seconds. */
unsigned int al_secs = MAX(3,lp_ldap_timeout()/2);
union nbt_cldap_netlogon *r = NULL;
blob = data_blob(NULL, 8192);
if (blob.data == NULL) {
DEBUG(1, ("data_blob failed\n"));
errno = ENOMEM;
return -1;
}
/* Setup timeout */
gotalarm = 0;
CatchSignal(SIGALRM, SIGNAL_CAST gotalarm_sig);
alarm(al_secs);
/* End setup timeout. */
ret = read(sock, blob.data, blob.length);
/* Teardown timeout. */
CatchSignal(SIGALRM, SIGNAL_CAST SIG_IGN);
alarm(0);
if (ret <= 0) {
DEBUG(1,("no reply received to cldap netlogon\n"));
data_blob_free(&blob);
return -1;
}
blob.length = ret;
asn1_load(&data, blob);
asn1_start_tag(&data, ASN1_SEQUENCE(0));
asn1_read_Integer(&data, &i1);
asn1_start_tag(&data, ASN1_APPLICATION(4));
asn1_read_OctetString(&data, &os1);
asn1_start_tag(&data, ASN1_SEQUENCE(0));
asn1_start_tag(&data, ASN1_SEQUENCE(0));
asn1_read_OctetString(&data, &os2);
asn1_start_tag(&data, ASN1_SET);
asn1_read_OctetString(&data, &os3);
asn1_end_tag(&data);
asn1_end_tag(&data);
asn1_end_tag(&data);
asn1_end_tag(&data);
asn1_end_tag(&data);
if (data.has_error) {
data_blob_free(&blob);
data_blob_free(&os1);
data_blob_free(&os2);
data_blob_free(&os3);
asn1_free(&data);
DEBUG(1,("Failed to parse cldap reply\n"));
return -1;
}
r = TALLOC_ZERO_P(mem_ctx, union nbt_cldap_netlogon);
if (!r) {
errno = ENOMEM;
data_blob_free(&os1);
data_blob_free(&os2);
data_blob_free(&os3);
data_blob_free(&blob);
return -1;
}
if (!pull_mailslot_cldap_reply(mem_ctx, &os3, r, nt_version)) {
data_blob_free(&os1);
data_blob_free(&os2);
data_blob_free(&os3);
data_blob_free(&blob);
TALLOC_FREE(r);
return -1;
}
data_blob_free(&os1);
data_blob_free(&os2);
data_blob_free(&os3);
data_blob_free(&blob);
asn1_free(&data);
if (reply) {
*reply = r;
} else {
TALLOC_FREE(r);
}
return 0;
}
/*
parse a negTokenInit packet giving a GUID, a list of supported
OIDs (the mechanisms) and a principal name string
*/
bool spnego_parse_negTokenInit(TALLOC_CTX *ctx,
DATA_BLOB blob,
char *OIDs[ASN1_MAX_OIDS],
char **principal,
DATA_BLOB *secblob)
{
int i;
bool ret;
ASN1_DATA *data;
data = asn1_init(talloc_tos());
if (data == NULL) {
return false;
}
asn1_load(data, blob);
asn1_start_tag(data,ASN1_APPLICATION(0));
asn1_check_OID(data,OID_SPNEGO);
/* negTokenInit [0] NegTokenInit */
asn1_start_tag(data,ASN1_CONTEXT(0));
asn1_start_tag(data,ASN1_SEQUENCE(0));
/* mechTypes [0] MechTypeList OPTIONAL */
/* Not really optional, we depend on this to decide
* what mechanisms we have to work with. */
asn1_start_tag(data,ASN1_CONTEXT(0));
asn1_start_tag(data,ASN1_SEQUENCE(0));
for (i=0; asn1_tag_remaining(data) > 0 && i < ASN1_MAX_OIDS-1; i++) {
asn1_read_OID(data,ctx, &OIDs[i]);
if (data->has_error) {
break;
}
}
OIDs[i] = NULL;
asn1_end_tag(data);
asn1_end_tag(data);
if (principal) {
*principal = NULL;
}
if (secblob) {
*secblob = data_blob_null;
}
/*
Win7 + Live Sign-in Assistant attaches a mechToken
ASN1_CONTEXT(2) to the negTokenInit packet
which breaks our negotiation if we just assume
the next tag is ASN1_CONTEXT(3).
*/
if (asn1_peek_tag(data, ASN1_CONTEXT(1))) {
uint8 flags;
/* reqFlags [1] ContextFlags OPTIONAL */
asn1_start_tag(data, ASN1_CONTEXT(1));
asn1_start_tag(data, ASN1_BIT_STRING);
while (asn1_tag_remaining(data) > 0) {
asn1_read_uint8(data, &flags);
}
asn1_end_tag(data);
asn1_end_tag(data);
}
if (asn1_peek_tag(data, ASN1_CONTEXT(2))) {
DATA_BLOB sblob = data_blob_null;
/* mechToken [2] OCTET STRING OPTIONAL */
asn1_start_tag(data, ASN1_CONTEXT(2));
asn1_read_OctetString(data, ctx, &sblob);
asn1_end_tag(data);
if (secblob) {
*secblob = sblob;
} else {
data_blob_free(&sblob);
}
}
if (asn1_peek_tag(data, ASN1_CONTEXT(3))) {
char *princ = NULL;
/* mechListMIC [3] OCTET STRING OPTIONAL */
asn1_start_tag(data, ASN1_CONTEXT(3));
asn1_start_tag(data, ASN1_SEQUENCE(0));
asn1_start_tag(data, ASN1_CONTEXT(0));
asn1_read_GeneralString(data, ctx, &princ);
asn1_end_tag(data);
asn1_end_tag(data);
asn1_end_tag(data);
if (principal) {
*principal = princ;
} else {
TALLOC_FREE(princ);
}
}
asn1_end_tag(data);
asn1_end_tag(data);
asn1_end_tag(data);
ret = !data->has_error;
if (data->has_error) {
int j;
if (principal) {
TALLOC_FREE(*principal);
}
if (secblob) {
data_blob_free(secblob);
}
for(j = 0; j < i && j < ASN1_MAX_OIDS-1; j++) {
TALLOC_FREE(OIDs[j]);
}
}
asn1_free(data);
return ret;
}
/*
parse a SPNEGO auth packet. This contains the encrypted passwords
*/
bool spnego_parse_auth_response(TALLOC_CTX *ctx,
DATA_BLOB blob, NTSTATUS nt_status,
const char *mechOID,
DATA_BLOB *auth)
{
ASN1_DATA *data;
uint8 negResult;
if (NT_STATUS_IS_OK(nt_status)) {
negResult = SPNEGO_ACCEPT_COMPLETED;
} else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
negResult = SPNEGO_ACCEPT_INCOMPLETE;
} else {
negResult = SPNEGO_REJECT;
}
data = asn1_init(talloc_tos());
if (data == NULL) {
return false;
}
asn1_load(data, blob);
asn1_start_tag(data, ASN1_CONTEXT(1));
asn1_start_tag(data, ASN1_SEQUENCE(0));
asn1_start_tag(data, ASN1_CONTEXT(0));
asn1_check_enumerated(data, negResult);
asn1_end_tag(data);
*auth = data_blob_null;
if (asn1_tag_remaining(data)) {
asn1_start_tag(data,ASN1_CONTEXT(1));
asn1_check_OID(data, mechOID);
asn1_end_tag(data);
if (asn1_tag_remaining(data)) {
asn1_start_tag(data,ASN1_CONTEXT(2));
asn1_read_OctetString(data, ctx, auth);
asn1_end_tag(data);
}
} else if (negResult == SPNEGO_ACCEPT_INCOMPLETE) {
data->has_error = 1;
}
/* Binding against Win2K DC returns a duplicate of the responseToken in
* the optional mechListMIC field. This is a bug in Win2K. We ignore
* this field if it exists. Win2K8 may return a proper mechListMIC at
* which point we need to implement the integrity checking. */
if (asn1_tag_remaining(data)) {
DATA_BLOB mechList = data_blob_null;
asn1_start_tag(data, ASN1_CONTEXT(3));
asn1_read_OctetString(data, ctx, &mechList);
asn1_end_tag(data);
data_blob_free(&mechList);
DEBUG(5,("spnego_parse_auth_response received mechListMIC, "
"ignoring.\n"));
}
asn1_end_tag(data);
asn1_end_tag(data);
if (data->has_error) {
DEBUG(3,("spnego_parse_auth_response failed at %d\n", (int)data->ofs));
asn1_free(data);
data_blob_free(auth);
return False;
}
asn1_free(data);
return True;
}
/*
receive a cldap netlogon reply
*/
static int recv_cldap_netlogon(int sock, struct cldap_netlogon_reply *reply)
{
int ret;
ASN1_DATA data;
DATA_BLOB blob;
DATA_BLOB os1, os2, os3;
uint32 i1;
char *p;
blob = data_blob(NULL, 8192);
ret = read(sock, blob.data, blob.length);
if (ret <= 0) {
d_printf("no reply received to cldap netlogon\n");
return -1;
}
blob.length = ret;
asn1_load(&data, blob);
asn1_start_tag(&data, ASN1_SEQUENCE(0));
asn1_read_Integer(&data, &i1);
asn1_start_tag(&data, ASN1_APPLICATION(4));
asn1_read_OctetString(&data, &os1);
asn1_start_tag(&data, ASN1_SEQUENCE(0));
asn1_start_tag(&data, ASN1_SEQUENCE(0));
asn1_read_OctetString(&data, &os2);
asn1_start_tag(&data, ASN1_SET);
asn1_read_OctetString(&data, &os3);
asn1_end_tag(&data);
asn1_end_tag(&data);
asn1_end_tag(&data);
asn1_end_tag(&data);
asn1_end_tag(&data);
if (data.has_error) {
d_printf("Failed to parse cldap reply\n");
return -1;
}
p = (char *)os3.data;
reply->type = IVAL(p, 0); p += 4;
reply->flags = IVAL(p, 0); p += 4;
memcpy(&reply->guid.info, p, UUID_FLAT_SIZE);
p += UUID_FLAT_SIZE;
p += pull_netlogon_string(reply->forest, p, (const char *)os3.data);
p += pull_netlogon_string(reply->domain, p, (const char *)os3.data);
p += pull_netlogon_string(reply->hostname, p, (const char *)os3.data);
p += pull_netlogon_string(reply->netbios_domain, p, (const char *)os3.data);
p += pull_netlogon_string(reply->netbios_hostname, p, (const char *)os3.data);
p += pull_netlogon_string(reply->unk, p, (const char *)os3.data);
if (reply->type == SAMLOGON_AD_R) {
p += pull_netlogon_string(reply->user_name, p, (const char *)os3.data);
} else {
*reply->user_name = 0;
}
p += pull_netlogon_string(reply->site_name, p, (const char *)os3.data);
p += pull_netlogon_string(reply->site_name_2, p, (const char *)os3.data);
reply->version = IVAL(p, 0);
reply->lmnt_token = SVAL(p, 4);
reply->lm20_token = SVAL(p, 6);
data_blob_free(&os1);
data_blob_free(&os2);
data_blob_free(&os3);
data_blob_free(&blob);
return 0;
}
/*
handle recv events on a cldap socket
*/
static bool cldap_socket_recv_dgram(struct cldap_socket *c,
struct cldap_incoming *in)
{
DATA_BLOB blob;
struct asn1_data *asn1;
void *p;
struct cldap_search_state *search;
NTSTATUS status;
if (in->recv_errno != 0) {
goto error;
}
blob = data_blob_const(in->buf, in->len);
asn1 = asn1_init(in);
if (!asn1) {
goto nomem;
}
if (!asn1_load(asn1, blob)) {
goto nomem;
}
in->ldap_msg = talloc(in, struct ldap_message);
if (in->ldap_msg == NULL) {
goto nomem;
}
/* this initial decode is used to find the message id */
status = ldap_decode(asn1, NULL, in->ldap_msg);
if (!NT_STATUS_IS_OK(status)) {
goto nterror;
}
/* find the pending request */
p = idr_find(c->searches.idr, in->ldap_msg->messageid);
if (p == NULL) {
if (!c->incoming.handler) {
TALLOC_FREE(in);
return true;
}
/* this function should free or steal 'in' */
c->incoming.handler(c, c->incoming.private_data, in);
return false;
}
search = talloc_get_type_abort(p, struct cldap_search_state);
search->response.in = talloc_move(search, &in);
search->response.asn1 = asn1;
search->response.asn1->ofs = 0;
DLIST_REMOVE(c->searches.list, search);
if (cldap_recvfrom_setup(c)) {
tevent_req_done(search->req);
return true;
}
/*
* This request was ok, just defer the notify of the caller
* and then just fail the next request if needed
*/
tevent_req_defer_callback(search->req, search->caller.ev);
tevent_req_done(search->req);
status = NT_STATUS_NO_MEMORY;
/* in is NULL it this point */
goto nterror;
nomem:
in->recv_errno = ENOMEM;
error:
status = map_nt_error_from_unix_common(in->recv_errno);
nterror:
TALLOC_FREE(in);
/* in connected mode the first pending search gets the error */
if (!c->connected) {
/* otherwise we just ignore the error */
return false;
}
if (!c->searches.list) {
return false;
}
/*
* We might called tevent_req_done() for a successful
* search before, so we better deliver the failure
* after the success, that is why we better also
* use tevent_req_defer_callback() here.
*/
tevent_req_defer_callback(c->searches.list->req,
c->searches.list->caller.ev);
tevent_req_nterror(c->searches.list->req, status);
return false;
}
static void ldapsrv_call_read_done(struct tevent_req *subreq)
{
struct ldapsrv_connection *conn =
tevent_req_callback_data(subreq,
struct ldapsrv_connection);
NTSTATUS status;
struct ldapsrv_call *call;
struct asn1_data *asn1;
DATA_BLOB blob;
call = talloc_zero(conn, struct ldapsrv_call);
if (!call) {
ldapsrv_terminate_connection(conn, "no memory");
return;
}
call->conn = conn;
status = tstream_read_pdu_blob_recv(subreq,
call,
&blob);
TALLOC_FREE(subreq);
if (!NT_STATUS_IS_OK(status)) {
const char *reason;
reason = talloc_asprintf(call, "ldapsrv_call_loop: "
"tstream_read_pdu_blob_recv() - %s",
nt_errstr(status));
if (!reason) {
reason = nt_errstr(status);
}
ldapsrv_terminate_connection(conn, reason);
return;
}
asn1 = asn1_init(call);
if (asn1 == NULL) {
ldapsrv_terminate_connection(conn, "no memory");
return;
}
call->request = talloc(call, struct ldap_message);
if (call->request == NULL) {
ldapsrv_terminate_connection(conn, "no memory");
return;
}
if (!asn1_load(asn1, blob)) {
ldapsrv_terminate_connection(conn, "asn1_load failed");
return;
}
status = ldap_decode(asn1, samba_ldap_control_handlers(),
call->request);
if (!NT_STATUS_IS_OK(status)) {
ldapsrv_terminate_connection(conn, nt_errstr(status));
return;
}
data_blob_free(&blob);
/* queue the call in the global queue */
subreq = ldapsrv_process_call_send(call,
conn->connection->event.ctx,
conn->service->call_queue,
call);
if (subreq == NULL) {
ldapsrv_terminate_connection(conn, "ldapsrv_process_call_send failed");
return;
}
tevent_req_set_callback(subreq, ldapsrv_call_process_done, call);
conn->active_call = subreq;
}
/*
handle recv events on a cldap socket
*/
static void cldap_socket_recv_dgram(struct cldap_socket *c,
struct cldap_incoming *in)
{
DATA_BLOB blob;
struct asn1_data *asn1;
void *p;
struct cldap_search_state *search;
NTSTATUS status;
if (in->recv_errno != 0) {
goto error;
}
blob = data_blob_const(in->buf, in->len);
asn1 = asn1_init(in);
if (!asn1) {
goto nomem;
}
if (!asn1_load(asn1, blob)) {
goto nomem;
}
in->ldap_msg = talloc(in, struct ldap_message);
if (in->ldap_msg == NULL) {
goto nomem;
}
/* this initial decode is used to find the message id */
status = ldap_decode(asn1, NULL, in->ldap_msg);
if (!NT_STATUS_IS_OK(status)) {
goto nterror;
}
/* find the pending request */
p = idr_find(c->searches.idr, in->ldap_msg->messageid);
if (p == NULL) {
if (!c->incoming.handler) {
goto done;
}
/* this function should free or steal 'in' */
c->incoming.handler(c, c->incoming.private_data, in);
return;
}
search = talloc_get_type(p, struct cldap_search_state);
search->response.in = talloc_move(search, &in);
search->response.asn1 = asn1;
search->response.asn1->ofs = 0;
tevent_req_done(search->req);
goto done;
nomem:
in->recv_errno = ENOMEM;
error:
status = map_nt_error_from_unix(in->recv_errno);
nterror:
/* in connected mode the first pending search gets the error */
if (!c->connected) {
/* otherwise we just ignore the error */
goto done;
}
if (!c->searches.list) {
goto done;
}
tevent_req_nterror(c->searches.list->req, status);
done:
talloc_free(in);
}