gss_accept_sec_context.c revision 168340
1153838Sdfr/*- 2153838Sdfr * Copyright (c) 2005 Doug Rabson 3153838Sdfr * All rights reserved. 4153838Sdfr * 5153838Sdfr * Redistribution and use in source and binary forms, with or without 6153838Sdfr * modification, are permitted provided that the following conditions 7153838Sdfr * are met: 8153838Sdfr * 1. Redistributions of source code must retain the above copyright 9153838Sdfr * notice, this list of conditions and the following disclaimer. 10153838Sdfr * 2. Redistributions in binary form must reproduce the above copyright 11153838Sdfr * notice, this list of conditions and the following disclaimer in the 12153838Sdfr * documentation and/or other materials provided with the distribution. 13153838Sdfr * 14153838Sdfr * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15153838Sdfr * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16153838Sdfr * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17153838Sdfr * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18153838Sdfr * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19153838Sdfr * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20153838Sdfr * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21153838Sdfr * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22153838Sdfr * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23153838Sdfr * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24153838Sdfr * SUCH DAMAGE. 25153838Sdfr * 26153838Sdfr * $FreeBSD: head/lib/libgssapi/gss_accept_sec_context.c 168340 2007-04-04 02:40:59Z kan $ 27153838Sdfr */ 28153838Sdfr 29153838Sdfr#include <gssapi/gssapi.h> 30153838Sdfr#include <stdlib.h> 31168340Skan#include <string.h> 32153838Sdfr#include <errno.h> 33153838Sdfr 34153838Sdfr#include "mech_switch.h" 35153838Sdfr#include "context.h" 36153838Sdfr#include "cred.h" 37153838Sdfr#include "name.h" 38153838Sdfr 39153838SdfrOM_uint32 gss_accept_sec_context(OM_uint32 *minor_status, 40153838Sdfr gss_ctx_id_t *context_handle, 41153838Sdfr const gss_cred_id_t acceptor_cred_handle, 42153838Sdfr const gss_buffer_t input_token, 43153838Sdfr const gss_channel_bindings_t input_chan_bindings, 44153838Sdfr gss_name_t *src_name, 45153838Sdfr gss_OID *mech_type, 46153838Sdfr gss_buffer_t output_token, 47153838Sdfr OM_uint32 *ret_flags, 48153838Sdfr OM_uint32 *time_rec, 49153838Sdfr gss_cred_id_t *delegated_cred_handle) 50153838Sdfr{ 51153838Sdfr OM_uint32 major_status; 52153838Sdfr struct _gss_mech_switch *m; 53153838Sdfr struct _gss_context *ctx = (struct _gss_context *) *context_handle; 54153838Sdfr struct _gss_cred *cred = (struct _gss_cred *) acceptor_cred_handle; 55153838Sdfr struct _gss_mechanism_cred *mc; 56153838Sdfr gss_cred_id_t acceptor_mc, delegated_mc; 57153838Sdfr gss_name_t src_mn; 58153838Sdfr int allocated_ctx; 59153838Sdfr 60153838Sdfr *minor_status = 0; 61153838Sdfr if (src_name) *src_name = 0; 62153838Sdfr if (mech_type) *mech_type = 0; 63153838Sdfr if (ret_flags) *ret_flags = 0; 64153838Sdfr if (time_rec) *time_rec = 0; 65153838Sdfr if (delegated_cred_handle) *delegated_cred_handle = 0; 66153838Sdfr output_token->length = 0; 67153838Sdfr output_token->value = 0; 68153838Sdfr 69153838Sdfr /* 70153838Sdfr * If this is the first call (*context_handle is NULL), we must 71153838Sdfr * parse the input token to figure out the mechanism to use. 72153838Sdfr */ 73153838Sdfr if (*context_handle == GSS_C_NO_CONTEXT) { 74153838Sdfr unsigned char *p = input_token->value; 75153838Sdfr size_t len = input_token->length; 76153838Sdfr size_t a, b; 77153838Sdfr gss_OID_desc mech_oid; 78153838Sdfr 79153838Sdfr /* 80153838Sdfr * Token must start with [APPLICATION 0] SEQUENCE. 81153838Sdfr */ 82153838Sdfr if (len == 0 || *p != 0x60) 83153838Sdfr return (GSS_S_DEFECTIVE_TOKEN); 84153838Sdfr p++; 85153838Sdfr len--; 86153838Sdfr 87153838Sdfr /* 88153838Sdfr * Decode the length and make sure it agrees with the 89153838Sdfr * token length. 90153838Sdfr */ 91153838Sdfr if (len == 0) 92153838Sdfr return (GSS_S_DEFECTIVE_TOKEN); 93153838Sdfr if ((*p & 0x80) == 0) { 94153838Sdfr a = *p; 95153838Sdfr p++; 96153838Sdfr len--; 97153838Sdfr } else { 98153838Sdfr b = *p & 0x7f; 99153838Sdfr p++; 100153838Sdfr len--; 101153838Sdfr if (len < b) 102153838Sdfr return (GSS_S_DEFECTIVE_TOKEN); 103153838Sdfr a = 0; 104153838Sdfr while (b) { 105153838Sdfr a = (a << 8) | *p; 106153838Sdfr p++; 107153838Sdfr len--; 108153838Sdfr b--; 109153838Sdfr } 110153838Sdfr } 111153838Sdfr if (a != len) 112153838Sdfr return (GSS_S_DEFECTIVE_TOKEN); 113153838Sdfr 114153838Sdfr /* 115153838Sdfr * Decode the OID for the mechanism. Simplify life by 116153838Sdfr * assuming that the OID length is less than 128 bytes. 117153838Sdfr */ 118153838Sdfr if (len < 2 || *p != 0x06) 119153838Sdfr return (GSS_S_DEFECTIVE_TOKEN); 120153838Sdfr if ((p[1] & 0x80) || p[1] > (len - 2)) 121153838Sdfr return (GSS_S_DEFECTIVE_TOKEN); 122153838Sdfr mech_oid.length = p[1]; 123153838Sdfr p += 2; 124153838Sdfr len -= 2; 125153838Sdfr mech_oid.elements = p; 126153838Sdfr 127153838Sdfr /* 128153838Sdfr * Now that we have a mechanism, we can find the 129153838Sdfr * implementation. 130153838Sdfr */ 131153838Sdfr ctx = malloc(sizeof(struct _gss_context)); 132153838Sdfr if (!ctx) { 133153838Sdfr *minor_status = ENOMEM; 134153838Sdfr return (GSS_S_DEFECTIVE_TOKEN); 135153838Sdfr } 136153838Sdfr memset(ctx, 0, sizeof(struct _gss_context)); 137153838Sdfr m = ctx->gc_mech = _gss_find_mech_switch(&mech_oid); 138153838Sdfr if (!m) { 139153838Sdfr free(ctx); 140153838Sdfr return (GSS_S_BAD_MECH); 141153838Sdfr } 142153838Sdfr allocated_ctx = 1; 143153838Sdfr } else { 144153838Sdfr m = ctx->gc_mech; 145153838Sdfr allocated_ctx = 0; 146153838Sdfr } 147153838Sdfr 148153838Sdfr if (cred) { 149153838Sdfr SLIST_FOREACH(mc, &cred->gc_mc, gmc_link) 150153838Sdfr if (mc->gmc_mech == m) 151153838Sdfr break; 152153838Sdfr if (!mc) 153153838Sdfr return (GSS_S_BAD_MECH); 154153838Sdfr acceptor_mc = mc->gmc_cred; 155153838Sdfr } else { 156153838Sdfr acceptor_mc = GSS_C_NO_CREDENTIAL; 157153838Sdfr } 158153838Sdfr delegated_mc = GSS_C_NO_CREDENTIAL; 159153838Sdfr 160153838Sdfr major_status = m->gm_accept_sec_context(minor_status, 161153838Sdfr &ctx->gc_ctx, 162153838Sdfr acceptor_mc, 163153838Sdfr input_token, 164153838Sdfr input_chan_bindings, 165153838Sdfr &src_mn, 166153838Sdfr mech_type, 167153838Sdfr output_token, 168153838Sdfr ret_flags, 169153838Sdfr time_rec, 170153838Sdfr &delegated_mc); 171153838Sdfr if (major_status != GSS_S_COMPLETE && 172153838Sdfr major_status != GSS_S_CONTINUE_NEEDED) 173153838Sdfr return (major_status); 174153838Sdfr 175153838Sdfr if (!src_name) { 176153838Sdfr m->gm_release_name(minor_status, &src_mn); 177153838Sdfr } else { 178153838Sdfr /* 179153838Sdfr * Make a new name and mark it as an MN. 180153838Sdfr */ 181153838Sdfr struct _gss_name *name = _gss_make_name(m, src_mn); 182153838Sdfr 183153838Sdfr if (!name) { 184153838Sdfr m->gm_release_name(minor_status, &src_mn); 185153838Sdfr return (GSS_S_FAILURE); 186153838Sdfr } 187153838Sdfr *src_name = (gss_name_t) name; 188153838Sdfr } 189153838Sdfr 190153838Sdfr if (*ret_flags & GSS_C_DELEG_FLAG) { 191153838Sdfr if (!delegated_cred_handle) { 192153838Sdfr m->gm_release_cred(minor_status, &delegated_mc); 193153838Sdfr *ret_flags &= ~GSS_C_DELEG_FLAG; 194153838Sdfr } else { 195153838Sdfr struct _gss_cred *cred; 196153838Sdfr struct _gss_mechanism_cred *mc; 197153838Sdfr 198153838Sdfr cred = malloc(sizeof(struct _gss_cred)); 199153838Sdfr if (!cred) { 200153838Sdfr *minor_status = ENOMEM; 201153838Sdfr return (GSS_S_FAILURE); 202153838Sdfr } 203153838Sdfr mc = malloc(sizeof(struct _gss_mechanism_cred)); 204153838Sdfr if (!mc) { 205153838Sdfr free(cred); 206153838Sdfr *minor_status = ENOMEM; 207153838Sdfr return (GSS_S_FAILURE); 208153838Sdfr } 209153838Sdfr m->gm_inquire_cred(minor_status, delegated_mc, 210153838Sdfr 0, 0, &cred->gc_usage, 0); 211153838Sdfr mc->gmc_mech = m; 212153838Sdfr mc->gmc_mech_oid = &m->gm_mech_oid; 213153838Sdfr mc->gmc_cred = delegated_mc; 214153838Sdfr SLIST_INSERT_HEAD(&cred->gc_mc, mc, gmc_link); 215153838Sdfr 216153838Sdfr *delegated_cred_handle = (gss_cred_id_t) cred; 217153838Sdfr } 218153838Sdfr } 219153838Sdfr 220153838Sdfr *context_handle = (gss_ctx_id_t) ctx; 221153838Sdfr return (major_status); 222153838Sdfr} 223