/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved. */ /* * glue routine gss_import_name * */ #include #include "gssapiP_generic.h" #include #ifdef HAVE_STDLIB_H #include #endif #include #include extern int get_der_length(unsigned char **, unsigned int, unsigned int *); /* local function to import GSS_C_EXPORT_NAME names */ static OM_uint32 importExportName(OM_uint32 *, gss_union_name_t); static OM_uint32 val_imp_name_args( OM_uint32 *minor_status, gss_buffer_t input_name_buffer, gss_name_t *output_name) { /* Initialize outputs. */ if (minor_status != NULL) *minor_status = 0; if (output_name != NULL) *output_name = GSS_C_NO_NAME; /* Validate arguments. */ if (minor_status == NULL) return (GSS_S_CALL_INACCESSIBLE_WRITE); if (output_name == NULL) return (GSS_S_CALL_INACCESSIBLE_WRITE); if (input_name_buffer == GSS_C_NO_BUFFER) return (GSS_S_CALL_INACCESSIBLE_READ | GSS_S_BAD_NAME); if (GSS_EMPTY_BUFFER(input_name_buffer)) return (GSS_S_CALL_INACCESSIBLE_READ | GSS_S_BAD_NAME); return (GSS_S_COMPLETE); } OM_uint32 gss_import_name(minor_status, input_name_buffer, input_name_type, output_name) OM_uint32 *minor_status; const gss_buffer_t input_name_buffer; const gss_OID input_name_type; gss_name_t *output_name; { gss_union_name_t union_name; OM_uint32 major_status = GSS_S_FAILURE, tmp; major_status = val_imp_name_args(minor_status, input_name_buffer, output_name); if (major_status != GSS_S_COMPLETE) return (major_status); /* * First create the union name struct that will hold the external * name and the name type. */ union_name = (gss_union_name_t)malloc(sizeof (gss_union_name_desc)); if (!union_name) return (GSS_S_FAILURE); union_name->mech_type = 0; union_name->mech_name = 0; union_name->name_type = 0; union_name->external_name = 0; /* * All we do here is record the external name and name_type. * When the name is actually used, the underlying gss_import_name() * is called for the appropriate mechanism. The exception to this * rule is when the name of GSS_C_NT_EXPORT_NAME type. If that is * the case, then we make it MN in this call. */ major_status = gssint_create_copy_buffer(input_name_buffer, &union_name->external_name, 0); if (major_status != GSS_S_COMPLETE) { free(union_name); return (major_status); } if (input_name_type != GSS_C_NULL_OID) { major_status = generic_gss_copy_oid(minor_status, input_name_type, &union_name->name_type); if (major_status != GSS_S_COMPLETE) { map_errcode(minor_status); goto allocation_failure; } } /* * In MIT Distribution the mechanism is determined from the nametype; * This is not a good idea - first mechanism that supports a given * name type is picked up; later on the caller can request a * different mechanism. So we don't determine the mechanism here. Now * the user level and kernel level import_name routine looks similar * except the kernel routine makes a copy of the nametype structure. We * do however make this an MN for names of GSS_C_NT_EXPORT_NAME type. */ if (input_name_type != GSS_C_NULL_OID && g_OID_equal(input_name_type, GSS_C_NT_EXPORT_NAME)) { major_status = importExportName(minor_status, union_name); if (major_status != GSS_S_COMPLETE) goto allocation_failure; } *output_name = (gss_name_t)union_name; return (GSS_S_COMPLETE); allocation_failure: if (union_name) { if (union_name->external_name) { if (union_name->external_name->value) free(union_name->external_name->value); free(union_name->external_name); } if (union_name->name_type) (void) generic_gss_release_oid(&tmp, &union_name->name_type); if (union_name->mech_name) (void) __gss_release_internal_name(minor_status, union_name->mech_type, &union_name->mech_name); if (union_name->mech_type) (void) generic_gss_release_oid(&tmp, &union_name->mech_type); free(union_name); } return (major_status); } /* * GSS export name constants */ static const char *expNameTokId = "\x04\x01"; static const int expNameTokIdLen = 2; static const int mechOidLenLen = 2; static const int nameTypeLenLen = 2; static OM_uint32 importExportName(minor, unionName) OM_uint32 *minor; gss_union_name_t unionName; { gss_OID_desc mechOid; gss_buffer_desc expName; unsigned char *buf; gss_mechanism mech; OM_uint32 major, mechOidLen, nameLen, curLength; unsigned int bytes; expName.value = unionName->external_name->value; expName.length = unionName->external_name->length; curLength = expNameTokIdLen + mechOidLenLen; if (expName.length < curLength) return (GSS_S_DEFECTIVE_TOKEN); buf = (unsigned char *)expName.value; if (memcmp(expNameTokId, buf, expNameTokIdLen) != 0) return (GSS_S_DEFECTIVE_TOKEN); buf += expNameTokIdLen; /* extract the mechanism oid length */ mechOidLen = (*buf++ << 8); mechOidLen |= (*buf++); curLength += mechOidLen; if (expName.length < curLength) return (GSS_S_DEFECTIVE_TOKEN); /* * The mechOid itself is encoded in DER format, OID Tag (0x06) * length and the value of mech_OID */ if (*buf++ != 0x06) return (GSS_S_DEFECTIVE_TOKEN); /* * mechoid Length is encoded twice; once in 2 bytes as * explained in RFC2743 (under mechanism independent exported * name object format) and once using DER encoding * * We verify both lengths. */ mechOid.length = get_der_length(&buf, (expName.length - curLength), &bytes); mechOid.elements = (void *)buf; /* * 'bytes' is the length of the DER length, '1' is for the DER * tag for OID */ if ((bytes + mechOid.length + 1) != mechOidLen) return (GSS_S_DEFECTIVE_TOKEN); buf += mechOid.length; if ((mech = __gss_get_mechanism(&mechOid)) == NULL) return (GSS_S_BAD_MECH); if (mech->gss_import_name == NULL) return (GSS_S_UNAVAILABLE); /* * we must now determine if we should unwrap the name ourselves * or make the mechanism do it - we should only unwrap it * if we create it; so if mech->gss_export_name == NULL, we must * have created it. */ if (mech->gss_export_name) { major = mech->gss_import_name(mech->context, minor, &expName, (gss_OID)GSS_C_NT_EXPORT_NAME, &unionName->mech_name); if (major != GSS_S_COMPLETE) map_error(minor, mech); else { major = generic_gss_copy_oid(minor, &mechOid, &unionName->mech_type); if (major != GSS_S_COMPLETE) map_errcode(minor); } return (major); } /* * we must have exported the name - so we now need to reconstruct it * and call the mechanism to create it * * WARNING: Older versions of __gss_export_internal_name() did * not export names correctly, but now it does. In * order to stay compatible with existing exported * names we must support names exported the broken * way. * * Specifically, __gss_export_internal_name() used to include * the name type OID in the encoding of the exported MN. * Additionally, the Kerberos V mech used to make display names * that included a null terminator which was counted in the * display name gss_buffer_desc. */ curLength += 4; /* 4 bytes for name len */ if (expName.length < curLength) return (GSS_S_DEFECTIVE_TOKEN); /* next 4 bytes in the name are the name length */ nameLen = (*buf++) << 24; nameLen |= (*buf++ << 16); nameLen |= (*buf++ << 8); nameLen |= (*buf++); /* * we use < here because bad code in rpcsec_gss rounds up exported * name token lengths and pads with nulls, otherwise != would be * appropriate */ curLength += nameLen; /* this is the total length */ if (expName.length < curLength) return (GSS_S_DEFECTIVE_TOKEN); /* * We detect broken exported names here: they always start with * a two-octet network-byte order OID length, which is always * less than 256 bytes, so the first octet of the length is * always '\0', which is not allowed in GSS-API display names * (or never occurs in them anyways). Of course, the OID * shouldn't be there, but it is. After the OID (sans DER tag * and length) there's the name itself, though null-terminated; * this null terminator should also not be there, but it is. */ if (nameLen > 0 && *buf == '\0') { OM_uint32 nameTypeLen; /* next two bytes are the name oid */ if (nameLen < nameTypeLenLen) return (GSS_S_DEFECTIVE_TOKEN); nameLen -= nameTypeLenLen; nameTypeLen = (*buf++) << 8; nameTypeLen |= (*buf++); if (nameLen < nameTypeLen) return (GSS_S_DEFECTIVE_TOKEN); buf += nameTypeLen; nameLen -= nameTypeLen; /* * adjust for expected null terminator that should * really not be there */ if (nameLen > 0 && *(buf + nameLen - 1) == '\0') nameLen--; } /* * Can a name be null? Let the mech decide. * * NOTE: We use GSS_C_NULL_OID as the name type when importing * the unwrapped name. Presumably the exported name had, * prior to being exported been obtained in such a way * that it has been properly perpared ("canonicalized," in * GSS-API terms) accroding to some name type; we cannot * tell what that name type was now, but the name should * need no further preparation other than the lowest * common denominator afforded by the mech to names * imported with GSS_C_NULL_OID. For the Kerberos V mech * this means doing less busywork too (particularly once * IDN is thrown in with Kerberos V extensions). */ expName.length = nameLen; expName.value = nameLen ? (void *)buf : NULL; major = mech->gss_import_name(mech->context, minor, &expName, GSS_C_NULL_OID, &unionName->mech_name); if (major != GSS_S_COMPLETE) { map_error(minor, mech); return (major); } major = generic_gss_copy_oid(minor, &mechOid, &unionName->mech_type); if (major != GSS_S_COMPLETE) { map_errcode(minor); } return (major); } /* importExportName */