*/
#include "mech_locl.h"
-RCSID("$Id: gss_accept_sec_context.c,v 1.6 2006/10/25 00:45:12 lha Exp $");
+RCSID("$Id$");
+
+static OM_uint32
+parse_header(const gss_buffer_t input_token, gss_OID mech_oid)
+{
+ unsigned char *p = input_token->value;
+ size_t len = input_token->length;
+ size_t a, b;
+
+ /*
+ * Token must start with [APPLICATION 0] SEQUENCE.
+ * But if it doesn't assume it is DCE-STYLE Kerberos!
+ */
+ if (len == 0)
+ return (GSS_S_DEFECTIVE_TOKEN);
+
+ p++;
+ len--;
+
+ /*
+ * Decode the length and make sure it agrees with the
+ * token length.
+ */
+ if (len == 0)
+ return (GSS_S_DEFECTIVE_TOKEN);
+ if ((*p & 0x80) == 0) {
+ a = *p;
+ p++;
+ len--;
+ } else {
+ b = *p & 0x7f;
+ p++;
+ len--;
+ if (len < b)
+ return (GSS_S_DEFECTIVE_TOKEN);
+ a = 0;
+ while (b) {
+ a = (a << 8) | *p;
+ p++;
+ len--;
+ b--;
+ }
+ }
+ if (a != len)
+ return (GSS_S_DEFECTIVE_TOKEN);
+
+ /*
+ * Decode the OID for the mechanism. Simplify life by
+ * assuming that the OID length is less than 128 bytes.
+ */
+ if (len < 2 || *p != 0x06)
+ return (GSS_S_DEFECTIVE_TOKEN);
+ if ((p[1] & 0x80) || p[1] > (len - 2))
+ return (GSS_S_DEFECTIVE_TOKEN);
+ mech_oid->length = p[1];
+ p += 2;
+ len -= 2;
+ mech_oid->elements = p;
+
+ return GSS_S_COMPLETE;
+}
+
+static gss_OID_desc krb5_mechanism =
+ {9, rk_UNCONST("\x2a\x86\x48\x86\xf7\x12\x01\x02\x02")};
+static gss_OID_desc ntlm_mechanism =
+ {10, rk_UNCONST("\x2b\x06\x01\x04\x01\x82\x37\x02\x02\x0a")};
+static gss_OID_desc spnego_mechanism =
+ {6, rk_UNCONST("\x2b\x06\x01\x05\x05\x02")};
+
+static OM_uint32
+choose_mech(const gss_buffer_t input, gss_OID mech_oid)
+{
+ OM_uint32 status;
+
+ /*
+ * First try to parse the gssapi token header and see if it's a
+ * correct header, use that in the first hand.
+ */
+
+ status = parse_header(input, mech_oid);
+ if (status == GSS_S_COMPLETE)
+ return GSS_S_COMPLETE;
+
+ /*
+ * Lets guess what mech is really is, callback function to mech ??
+ */
+
+ if (input->length > 8 &&
+ memcmp((const char *)input->value, "NTLMSSP\x00", 8) == 0)
+ {
+ *mech_oid = ntlm_mechanism;
+ return GSS_S_COMPLETE;
+ } else if (input->length != 0 &&
+ ((const char *)input->value)[0] == 0x6E)
+ {
+ /* Could be a raw AP-REQ (check for APPLICATION tag) */
+ *mech_oid = krb5_mechanism;
+ return GSS_S_COMPLETE;
+ } else if (input->length == 0) {
+ /*
+ * There is the a wierd mode of SPNEGO (in CIFS and
+ * SASL GSS-SPENGO where the first token is zero
+ * length and the acceptor returns a mech_list, lets
+ * hope that is what is happening now.
+ */
+ *mech_oid = spnego_mechanism;
+ return GSS_S_COMPLETE;
+ }
+ return status;
+}
+
OM_uint32 gss_accept_sec_context(OM_uint32 *minor_status,
gss_ctx_id_t *context_handle,
OM_uint32 *time_rec,
gss_cred_id_t *delegated_cred_handle)
{
- OM_uint32 major_status, mech_ret_flags;
+ OM_uint32 major_status, mech_ret_flags, junk;
gssapi_mech_interface m;
struct _gss_context *ctx = (struct _gss_context *) *context_handle;
struct _gss_cred *cred = (struct _gss_cred *) acceptor_cred_handle;
struct _gss_mechanism_cred *mc;
gss_cred_id_t acceptor_mc, delegated_mc;
gss_name_t src_mn;
- int allocated_ctx;
*minor_status = 0;
- if (src_name) *src_name = 0;
- if (mech_type) *mech_type = 0;
- if (ret_flags) *ret_flags = 0;
- if (time_rec) *time_rec = 0;
- if (delegated_cred_handle) *delegated_cred_handle = 0;
- output_token->length = 0;
- output_token->value = 0;
+ if (src_name)
+ *src_name = GSS_C_NO_NAME;
+ if (mech_type)
+ *mech_type = GSS_C_NO_OID;
+ if (ret_flags)
+ *ret_flags = 0;
+ if (time_rec)
+ *time_rec = 0;
+ if (delegated_cred_handle)
+ *delegated_cred_handle = GSS_C_NO_CREDENTIAL;
+ _mg_buffer_zero(output_token);
+
/*
* If this is the first call (*context_handle is NULL), we must
* parse the input token to figure out the mechanism to use.
*/
if (*context_handle == GSS_C_NO_CONTEXT) {
- unsigned char *p = input_token->value;
- size_t len = input_token->length;
- size_t a, b;
gss_OID_desc mech_oid;
- /*
- * Token must start with [APPLICATION 0] SEQUENCE.
- * But if it doesn't assume its DCE-STYLE Kerberos!
- */
- if (len == 0)
- return (GSS_S_DEFECTIVE_TOKEN);
- if (*p != 0x60) {
- mech_oid = *GSS_KRB5_MECHANISM;
- } else {
- p++;
- len--;
-
- /*
- * Decode the length and make sure it agrees with the
- * token length.
- */
- if (len == 0)
- return (GSS_S_DEFECTIVE_TOKEN);
- if ((*p & 0x80) == 0) {
- a = *p;
- p++;
- len--;
- } else {
- b = *p & 0x7f;
- p++;
- len--;
- if (len < b)
- return (GSS_S_DEFECTIVE_TOKEN);
- a = 0;
- while (b) {
- a = (a << 8) | *p;
- p++;
- len--;
- b--;
- }
- }
- if (a != len)
- return (GSS_S_DEFECTIVE_TOKEN);
-
- /*
- * Decode the OID for the mechanism. Simplify life by
- * assuming that the OID length is less than 128 bytes.
- */
- if (len < 2 || *p != 0x06)
- return (GSS_S_DEFECTIVE_TOKEN);
- if ((p[1] & 0x80) || p[1] > (len - 2))
- return (GSS_S_DEFECTIVE_TOKEN);
- mech_oid.length = p[1];
- p += 2;
- len -= 2;
- mech_oid.elements = p;
- }
+ major_status = choose_mech(input_token, &mech_oid);
+ if (major_status != GSS_S_COMPLETE)
+ return major_status;
+
/*
* Now that we have a mechanism, we can find the
* implementation.
free(ctx);
return (GSS_S_BAD_MECH);
}
- allocated_ctx = 1;
+ *context_handle = (gss_ctx_id_t) ctx;
} else {
m = ctx->gc_mech;
- allocated_ctx = 0;
}
if (cred) {
SLIST_FOREACH(mc, &cred->gc_mc, gmc_link)
if (mc->gmc_mech == m)
break;
- if (!mc)
+ if (!mc) {
+ gss_delete_sec_context(&junk, context_handle, NULL);
return (GSS_S_BAD_MECH);
+ }
acceptor_mc = mc->gmc_cred;
} else {
acceptor_mc = GSS_C_NO_CREDENTIAL;
&delegated_mc);
if (major_status != GSS_S_COMPLETE &&
major_status != GSS_S_CONTINUE_NEEDED)
+ {
+ _gss_mg_error(m, major_status, *minor_status);
+ gss_delete_sec_context(&junk, context_handle, NULL);
return (major_status);
+ }
- if (!src_name) {
- m->gm_release_name(minor_status, &src_mn);
- } else {
+ if (src_name && src_mn) {
/*
* Make a new name and mark it as an MN.
*/
if (!name) {
m->gm_release_name(minor_status, &src_mn);
+ gss_delete_sec_context(&junk, context_handle, NULL);
return (GSS_S_FAILURE);
}
*src_name = (gss_name_t) name;
+ } else if (src_mn) {
+ m->gm_release_name(minor_status, &src_mn);
}
if (mech_ret_flags & GSS_C_DELEG_FLAG) {
if (!delegated_cred_handle) {
m->gm_release_cred(minor_status, &delegated_mc);
*ret_flags &= ~GSS_C_DELEG_FLAG;
- } else {
+ } else if (delegated_mc) {
struct _gss_cred *dcred;
struct _gss_mechanism_cred *dmc;
dcred = malloc(sizeof(struct _gss_cred));
if (!dcred) {
*minor_status = ENOMEM;
+ gss_delete_sec_context(&junk, context_handle, NULL);
return (GSS_S_FAILURE);
}
SLIST_INIT(&dcred->gc_mc);
if (!dmc) {
free(dcred);
*minor_status = ENOMEM;
+ gss_delete_sec_context(&junk, context_handle, NULL);
return (GSS_S_FAILURE);
}
- m->gm_inquire_cred(minor_status, delegated_mc,
- 0, 0, &dcred->gc_usage, 0);
dmc->gmc_mech = m;
dmc->gmc_mech_oid = &m->gm_mech_oid;
dmc->gmc_cred = delegated_mc;
if (ret_flags)
*ret_flags = mech_ret_flags;
- *context_handle = (gss_ctx_id_t) ctx;
return (major_status);
}
git.samba.org / amitay / samba.git / blobdiff