gss_accept_sec_context.c revision 178692
11556Srgrimes/*- 21556Srgrimes * Copyright (c) 2005 Doug Rabson 31556Srgrimes * All rights reserved. 41556Srgrimes * 51556Srgrimes * Redistribution and use in source and binary forms, with or without 61556Srgrimes * modification, are permitted provided that the following conditions 71556Srgrimes * are met: 81556Srgrimes * 1. Redistributions of source code must retain the above copyright 91556Srgrimes * notice, this list of conditions and the following disclaimer. 101556Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111556Srgrimes * notice, this list of conditions and the following disclaimer in the 121556Srgrimes * documentation and/or other materials provided with the distribution. 131556Srgrimes * 141556Srgrimes * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 151556Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 161556Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 171556Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 181556Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 191556Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 201556Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 211556Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 221556Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 231556Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 241556Srgrimes * SUCH DAMAGE. 251556Srgrimes * 261556Srgrimes * $FreeBSD: head/lib/libgssapi/gss_accept_sec_context.c 178692 2008-04-30 11:29:22Z dfr $ 271556Srgrimes */ 281556Srgrimes 291556Srgrimes#include <gssapi/gssapi.h> 301556Srgrimes#include <stdlib.h> 311556Srgrimes#include <string.h> 321556Srgrimes#include <errno.h> 331556Srgrimes 341556Srgrimes#include "mech_switch.h" 3536149Scharnier#include "context.h" 36105269Smarkm#include "cred.h" 3736149Scharnier#include "name.h" 381556Srgrimes 3999110SobrienOM_uint32 gss_accept_sec_context(OM_uint32 *minor_status, 4099110Sobrien gss_ctx_id_t *context_handle, 411556Srgrimes const gss_cred_id_t acceptor_cred_handle, 421556Srgrimes const gss_buffer_t input_token, 431556Srgrimes const gss_channel_bindings_t input_chan_bindings, 441556Srgrimes gss_name_t *src_name, 451556Srgrimes gss_OID *mech_type, 461556Srgrimes gss_buffer_t output_token, 471556Srgrimes OM_uint32 *ret_flags, 481556Srgrimes OM_uint32 *time_rec, 491556Srgrimes gss_cred_id_t *delegated_cred_handle) 501556Srgrimes{ 511556Srgrimes OM_uint32 major_status, mech_ret_flags; 521556Srgrimes struct _gss_mech_switch *m; 531556Srgrimes struct _gss_context *ctx = (struct _gss_context *) *context_handle; 541556Srgrimes struct _gss_cred *cred = (struct _gss_cred *) acceptor_cred_handle; 551556Srgrimes struct _gss_mechanism_cred *mc; 561556Srgrimes gss_cred_id_t acceptor_mc, delegated_mc; 571556Srgrimes gss_name_t src_mn; 581556Srgrimes int allocated_ctx; 5990110Simp 601556Srgrimes *minor_status = 0; 611556Srgrimes if (src_name) *src_name = 0; 621556Srgrimes if (mech_type) *mech_type = 0; 631556Srgrimes if (ret_flags) *ret_flags = 0; 641556Srgrimes if (time_rec) *time_rec = 0; 651556Srgrimes if (delegated_cred_handle) *delegated_cred_handle = 0; 661556Srgrimes output_token->length = 0; 671556Srgrimes output_token->value = 0; 681556Srgrimes 691556Srgrimes /* 701556Srgrimes * If this is the first call (*context_handle is NULL), we must 711556Srgrimes * parse the input token to figure out the mechanism to use. 721556Srgrimes */ 731556Srgrimes if (*context_handle == GSS_C_NO_CONTEXT) { 7490110Simp unsigned char *p = input_token->value; 751556Srgrimes size_t len = input_token->length; 761556Srgrimes size_t a, b; 771556Srgrimes gss_OID_desc mech_oid; 781556Srgrimes 791556Srgrimes /* 801556Srgrimes * Token must start with [APPLICATION 0] SEQUENCE. 811556Srgrimes */ 821556Srgrimes if (len == 0 || *p != 0x60) 831556Srgrimes return (GSS_S_DEFECTIVE_TOKEN); 841556Srgrimes p++; 851556Srgrimes len--; 861556Srgrimes 871556Srgrimes /* 8890110Simp * Decode the length and make sure it agrees with the 891556Srgrimes * token length. 901556Srgrimes */ 911556Srgrimes if (len == 0) 921556Srgrimes return (GSS_S_DEFECTIVE_TOKEN); 931556Srgrimes if ((*p & 0x80) == 0) { 941556Srgrimes a = *p; 951556Srgrimes p++; 961556Srgrimes len--; 971556Srgrimes } else { 9880818Sobrien b = *p & 0x7f; 991556Srgrimes p++; 1001556Srgrimes len--; 1011556Srgrimes if (len < b) 1021556Srgrimes return (GSS_S_DEFECTIVE_TOKEN); 1031556Srgrimes a = 0; 1041556Srgrimes while (b) { 1051556Srgrimes a = (a << 8) | *p; 1061556Srgrimes p++; 1071556Srgrimes len--; 10890110Simp b--; 1091556Srgrimes } 1101556Srgrimes } 1117165Sjoerg if (a != len) 1121556Srgrimes return (GSS_S_DEFECTIVE_TOKEN); 1131556Srgrimes 1141556Srgrimes /* 1151556Srgrimes * Decode the OID for the mechanism. Simplify life by 1161556Srgrimes * assuming that the OID length is less than 128 bytes. 1171556Srgrimes */ 1188855Srgrimes if (len < 2 || *p != 0x06) 1191556Srgrimes return (GSS_S_DEFECTIVE_TOKEN); 1201556Srgrimes if ((p[1] & 0x80) || p[1] > (len - 2)) 12179452Sbrian return (GSS_S_DEFECTIVE_TOKEN); 1221556Srgrimes mech_oid.length = p[1]; 1231556Srgrimes p += 2; 1241556Srgrimes len -= 2; 1251556Srgrimes mech_oid.elements = p; 1261556Srgrimes 1271556Srgrimes /* 1281556Srgrimes * Now that we have a mechanism, we can find the 1291556Srgrimes * implementation. 1301556Srgrimes */ 1311556Srgrimes ctx = malloc(sizeof(struct _gss_context)); 1321556Srgrimes if (!ctx) { 1331556Srgrimes *minor_status = ENOMEM; 13490110Simp return (GSS_S_DEFECTIVE_TOKEN); 1351556Srgrimes } 1361556Srgrimes memset(ctx, 0, sizeof(struct _gss_context)); 1371556Srgrimes m = ctx->gc_mech = _gss_find_mech_switch(&mech_oid); 1381556Srgrimes if (!m) { 1391556Srgrimes free(ctx); 1401556Srgrimes return (GSS_S_BAD_MECH); 1411556Srgrimes } 1421556Srgrimes allocated_ctx = 1; 1431556Srgrimes } else { 1441556Srgrimes m = ctx->gc_mech; 1451556Srgrimes allocated_ctx = 0; 1461556Srgrimes } 1471556Srgrimes 1481556Srgrimes if (cred) { 1491556Srgrimes SLIST_FOREACH(mc, &cred->gc_mc, gmc_link) 1501556Srgrimes if (mc->gmc_mech == m) 1511556Srgrimes break; 1521556Srgrimes if (!mc) 1531556Srgrimes return (GSS_S_BAD_MECH); 1541556Srgrimes acceptor_mc = mc->gmc_cred; 1551556Srgrimes } else { 1561556Srgrimes acceptor_mc = GSS_C_NO_CREDENTIAL; 1571556Srgrimes } 158104130Sjmallett delegated_mc = GSS_C_NO_CREDENTIAL; 1591556Srgrimes 1601556Srgrimes major_status = m->gm_accept_sec_context(minor_status, 1611556Srgrimes &ctx->gc_ctx, 1621556Srgrimes acceptor_mc, 1631556Srgrimes input_token, 164 input_chan_bindings, 165 &src_mn, 166 mech_type, 167 output_token, 168 &mech_ret_flags, 169 time_rec, 170 &delegated_mc); 171 if (major_status != GSS_S_COMPLETE && 172 major_status != GSS_S_CONTINUE_NEEDED) 173 return (major_status); 174 175 if (!src_name) { 176 m->gm_release_name(minor_status, &src_mn); 177 } else { 178 /* 179 * Make a new name and mark it as an MN. 180 */ 181 struct _gss_name *name = _gss_make_name(m, src_mn); 182 183 if (!name) { 184 m->gm_release_name(minor_status, &src_mn); 185 return (GSS_S_FAILURE); 186 } 187 *src_name = (gss_name_t) name; 188 } 189 190 if (delegated_mc == GSS_C_NO_CREDENTIAL) 191 mech_ret_flags &= ~GSS_C_DELEG_FLAG; 192 193 if (mech_ret_flags & GSS_C_DELEG_FLAG) { 194 if (!delegated_cred_handle) { 195 m->gm_release_cred(minor_status, &delegated_mc); 196 mech_ret_flags &= ~GSS_C_DELEG_FLAG; 197 } else { 198 struct _gss_cred *cred; 199 struct _gss_mechanism_cred *mc; 200 201 cred = malloc(sizeof(struct _gss_cred)); 202 if (!cred) { 203 *minor_status = ENOMEM; 204 return (GSS_S_FAILURE); 205 } 206 SLIST_INIT(&cred->gc_mc); 207 mc = malloc(sizeof(struct _gss_mechanism_cred)); 208 if (!mc) { 209 free(cred); 210 *minor_status = ENOMEM; 211 return (GSS_S_FAILURE); 212 } 213 m->gm_inquire_cred(minor_status, delegated_mc, 214 0, 0, &cred->gc_usage, 0); 215 mc->gmc_mech = m; 216 mc->gmc_mech_oid = &m->gm_mech_oid; 217 mc->gmc_cred = delegated_mc; 218 SLIST_INSERT_HEAD(&cred->gc_mc, mc, gmc_link); 219 220 *delegated_cred_handle = (gss_cred_id_t) cred; 221 } 222 } 223 224 if (ret_flags) 225 *ret_flags = mech_ret_flags; 226 *context_handle = (gss_ctx_id_t) ctx; 227 return (major_status); 228} 229