#include "smb_krb5.h"
#include "../lib/util/asn1.h"
-/*
- generate a negTokenInit packet given a list of supported
- OIDs (the mechanisms) a blob, and a principal name string
-*/
-
-DATA_BLOB spnego_gen_negTokenInit(TALLOC_CTX *ctx,
- const char *OIDs[],
- DATA_BLOB *psecblob,
- const char *principal)
-{
- int i;
- ASN1_DATA *data;
- DATA_BLOB ret = data_blob_null;
-
- data = asn1_init(talloc_tos());
- if (data == NULL) {
- return data_blob_null;
- }
-
- if (!asn1_push_tag(data,ASN1_APPLICATION(0))) goto err;
- if (!asn1_write_OID(data,OID_SPNEGO)) goto err;
- if (!asn1_push_tag(data,ASN1_CONTEXT(0))) goto err;
- if (!asn1_push_tag(data,ASN1_SEQUENCE(0))) goto err;
-
- if (!asn1_push_tag(data,ASN1_CONTEXT(0))) goto err;
- if (!asn1_push_tag(data,ASN1_SEQUENCE(0))) goto err;
- for (i=0; OIDs[i]; i++) {
- if (!asn1_write_OID(data,OIDs[i])) goto err;
- }
- if (!asn1_pop_tag(data)) goto err;
- if (!asn1_pop_tag(data)) goto err;
-
- if (psecblob && psecblob->length && psecblob->data) {
- if (!asn1_push_tag(data, ASN1_CONTEXT(2))) goto err;
- if (!asn1_write_OctetString(data,psecblob->data,
- psecblob->length)) goto err;
- if (!asn1_pop_tag(data)) goto err;
- }
-
- if (principal) {
- if (!asn1_push_tag(data, ASN1_CONTEXT(3))) goto err;
- if (!asn1_push_tag(data, ASN1_SEQUENCE(0))) goto err;
- if (!asn1_push_tag(data, ASN1_CONTEXT(0))) goto err;
- if (!asn1_write_GeneralString(data,principal)) goto err;
- if (!asn1_pop_tag(data)) goto err;
- if (!asn1_pop_tag(data)) goto err;
- if (!asn1_pop_tag(data)) goto err;
- }
-
- if (!asn1_pop_tag(data)) goto err;
- if (!asn1_pop_tag(data)) goto err;
-
- if (!asn1_pop_tag(data)) goto err;
-
- if (!asn1_extract_blob(data, ctx, &ret)) {
- goto err;
- }
-
- asn1_free(data);
- data = NULL;
-
- err:
-
- if (data != NULL) {
- if (asn1_has_error(data)) {
- DEBUG(1, ("Failed to build negTokenInit at offset %d\n",
- (int)asn1_current_ofs(data)));
- }
-
- asn1_free(data);
- }
-
- return ret;
-}
-
/*
parse a negTokenInit packet giving a GUID, a list of supported
OIDs (the mechanisms) and a principal name string
return ret;
}
-
-/*
- generate a SPNEGO krb5 negTokenInit packet, ready for a EXTENDED_SECURITY
- kerberos session setup
-*/
-int spnego_gen_krb5_negTokenInit(TALLOC_CTX *ctx,
- const char *principal, int time_offset,
- DATA_BLOB *targ,
- DATA_BLOB *session_key_krb5, uint32_t extra_ap_opts,
- const char *ccname, time_t *expire_time)
-{
- int retval;
- DATA_BLOB tkt, tkt_wrapped;
- const char *krb_mechs[] = {OID_KERBEROS5_OLD, OID_KERBEROS5, OID_NTLMSSP, NULL};
-
- /* get a kerberos ticket for the service and extract the session key */
- retval = cli_krb5_get_ticket(ctx, principal, time_offset,
- &tkt, session_key_krb5,
- extra_ap_opts, ccname,
- expire_time, NULL);
- if (retval) {
- return retval;
- }
-
- /* wrap that up in a nice GSS-API wrapping */
- tkt_wrapped = spnego_gen_krb5_wrap(ctx, tkt, TOK_ID_KRB_AP_REQ);
-
- /* and wrap that in a shiny SPNEGO wrapper */
- *targ = spnego_gen_negTokenInit(ctx, krb_mechs, &tkt_wrapped, NULL);
-
- data_blob_free(&tkt_wrapped);
- data_blob_free(&tkt);
-
- return retval;
-}
-
-
-/*
- 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) > 0) {
- 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;
-}
-
-
-/*
- generate a SPNEGO auth packet. This will contain the encrypted passwords
-*/
-DATA_BLOB spnego_gen_auth(TALLOC_CTX *ctx, DATA_BLOB blob)
-{
- ASN1_DATA *data;
- DATA_BLOB ret = data_blob_null;
-
- data = asn1_init(talloc_tos());
- if (data == NULL) {
- return data_blob_null;
- }
-
- if (!asn1_push_tag(data, ASN1_CONTEXT(1))) goto err;
- if (!asn1_push_tag(data, ASN1_SEQUENCE(0))) goto err;
- if (!asn1_push_tag(data, ASN1_CONTEXT(2))) goto err;
- if (!asn1_write_OctetString(data,blob.data,blob.length)) goto err;
- if (!asn1_pop_tag(data)) goto err;
- if (!asn1_pop_tag(data)) goto err;
- if (!asn1_pop_tag(data)) goto err;
-
- if (!asn1_extract_blob(data, ctx, &ret)) {
- goto err;
- }
-
- err:
-
- 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_t negResult;
- bool ret = false;
-
- 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;
- }
-
- *auth = data_blob_null;
-
- 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, negResult)) goto err;
- if (!asn1_end_tag(data)) goto err;
-
- if (asn1_tag_remaining(data) > 0) {
- if (!asn1_start_tag(data,ASN1_CONTEXT(1))) goto err;
- if (!asn1_check_OID(data, mechOID)) goto err;
- if (!asn1_end_tag(data)) goto err;
-
- if (asn1_tag_remaining(data) > 0) {
- if (!asn1_start_tag(data,ASN1_CONTEXT(2))) goto err;
- if (!asn1_read_OctetString(data, ctx, auth)) goto err;
- if (!asn1_end_tag(data)) goto err;
- }
- } else if (negResult == SPNEGO_ACCEPT_INCOMPLETE) {
- asn1_set_error(data);
- goto err;
- }
-
- /* 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) > 0) {
- DATA_BLOB mechList = data_blob_null;
- if (!asn1_start_tag(data, ASN1_CONTEXT(3))) goto err;
- if (!asn1_read_OctetString(data, ctx, &mechList)) goto err;
- data_blob_free(&mechList);
- if (!asn1_end_tag(data)) goto err;
- DEBUG(5,("spnego_parse_auth_response received mechListMIC, "
- "ignoring.\n"));
- }
-
- 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)) {
- DEBUG(3, ("spnego_parse_auth_response failed at %d\n",
- (int)asn1_current_ofs(data)));
- asn1_free(data);
- data_blob_free(auth);
- return false;
- }
-
- asn1_free(data);
- return ret;
-}