get GSS-EAP working again with TLV
[moonshot.git] / mech_eap / gssapiP_eap.h
1 /*
2  * Copyright (c) 2011, JANET(UK)
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  *
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  *
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  *
16  * 3. Neither the name of JANET(UK) nor the names of its contributors
17  *    may be used to endorse or promote products derived from this software
18  *    without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30  * SUCH DAMAGE.
31  */
32
33 #ifndef _GSSAPIP_EAP_H_
34 #define _GSSAPIP_EAP_H_ 1
35
36 #include "config.h"
37
38 #ifdef HAVE_HEIMDAL_VERSION
39 #define KRB5_DEPRECATED         /* so we can use krb5_free_unparsed_name() */
40 #endif
41
42 #include <assert.h>
43 #include <string.h>
44 #include <errno.h>
45 #include <unistd.h>
46 #include <stdlib.h>
47 #include <time.h>
48 #include <sys/param.h>
49
50 /* GSS headers */
51 #include <gssapi/gssapi.h>
52 #include <gssapi/gssapi_krb5.h>
53 #ifndef HAVE_HEIMDAL_VERSION
54 #include <gssapi/gssapi_ext.h>
55 #endif
56 #include "gssapi_eap.h"
57
58 /* Kerberos headers */
59 #include <krb5.h>
60
61 /* EAP headers */
62 #include <common.h>
63 #include <eap_peer/eap.h>
64 #include <eap_peer/eap_config.h>
65 #include <eap_peer/eap_methods.h>
66 #include <eap_common/eap_common.h>
67 #include <wpabuf.h>
68
69 /* FreeRADIUS headers */
70 #ifdef __cplusplus
71 extern "C" {
72 #define operator fr_operator
73 #endif
74 #include <freeradius/libradius.h>
75 #include <freeradius/radius.h>
76 #include <radsec/radsec.h>
77 #include <radsec/request.h>
78 #ifdef __cplusplus
79 #undef operator
80 }
81 #endif
82
83 #include "gsseap_err.h"
84 #include "radsec_err.h"
85 #include "util.h"
86
87 #ifdef __cplusplus
88 extern "C" {
89 #endif
90
91 /* These name flags are informative and not actually used by anything yet */
92 #define NAME_FLAG_NAI                       0x00000001
93 #define NAME_FLAG_SERVICE                   0x00000002
94 #define NAME_FLAG_COMPOSITE                 0x00000004
95
96 struct gss_eap_saml_attr_ctx;
97 struct gss_eap_attr_ctx;
98
99 #ifdef HAVE_HEIMDAL_VERSION
100 struct gss_name_t_desc_struct
101 #else
102 struct gss_name_struct
103 #endif
104 {
105     GSSEAP_MUTEX mutex; /* mutex protects attrCtx */
106     OM_uint32 flags;
107     krb5_principal krbPrincipal; /* this is immutable */
108     struct gss_eap_attr_ctx *attrCtx;
109 };
110
111 #define CRED_FLAG_INITIATE                  0x00010000
112 #define CRED_FLAG_ACCEPT                    0x00020000
113 #define CRED_FLAG_DEFAULT_IDENTITY          0x00040000
114 #define CRED_FLAG_PASSWORD                  0x00080000
115 #define CRED_FLAG_DEFAULT_CCACHE            0x00100000
116 #define CRED_FLAG_PUBLIC_MASK               0x0000FFFF
117
118 #ifdef HAVE_HEIMDAL_VERSION
119 struct gss_cred_id_t_desc_struct
120 #else
121 struct gss_cred_id_struct
122 #endif
123 {
124     GSSEAP_MUTEX mutex;
125     OM_uint32 flags;
126     gss_name_t name;
127     gss_buffer_desc password;
128     gss_OID_set mechanisms;
129     time_t expiryTime;
130     char *radiusConfigFile;
131     char *radiusConfigStanza;
132 #ifdef GSSEAP_ENABLE_REAUTH
133     krb5_ccache krbCredCache;
134     gss_cred_id_t krbCred;
135 #endif
136 };
137
138 #define CTX_FLAG_INITIATOR                  0x00000001
139 #define CTX_FLAG_KRB_REAUTH                 0x00000002
140
141 #define CTX_IS_INITIATOR(ctx)               (((ctx)->flags & CTX_FLAG_INITIATOR) != 0)
142
143 enum gss_eap_state {
144     GSSEAP_STATE_INITIAL        = 0x01,     /* initial state */
145     GSSEAP_STATE_AUTHENTICATE   = 0x02,     /* exchange EAP messages */
146     GSSEAP_STATE_INITIATOR_EXTS = 0x04,     /* initiator extensions */
147     GSSEAP_STATE_ACCEPTOR_EXTS  = 0x08,     /* acceptor extensions */
148     GSSEAP_STATE_ESTABLISHED    = 0x10,     /* context established */
149     GSSEAP_STATE_ALL            = 0x1F
150 };
151
152 #define GSSEAP_STATE_NEXT(s)    ((s) << 1)
153
154 /* state machine entry */
155 struct gss_eap_sm {
156     OM_uint32 inputTokenType;
157     OM_uint32 outputTokenType;
158     enum gss_eap_state validStates;
159     int critical;
160     int required;
161     OM_uint32 (*processToken)(OM_uint32 *,
162                               gss_cred_id_t,
163                               gss_ctx_id_t,
164                               gss_name_t,
165                               gss_OID,
166                               OM_uint32,
167                               OM_uint32,
168                               gss_channel_bindings_t,
169                               gss_buffer_t,
170                               gss_buffer_t,
171                               OM_uint32 *);
172 };
173
174 #define SM_FLAG_TRANSITION                  0x00000001
175 #define SM_FLAG_FORCE_SEND_TOKEN            0x00000002
176 #define SM_FLAG_STOP_EVAL                   0x00000004
177
178 #define CTX_IS_ESTABLISHED(ctx)             ((ctx)->state == GSSEAP_STATE_ESTABLISHED)
179
180 /* Initiator context flags */
181 #define CTX_FLAG_EAP_SUCCESS                0x00010000
182 #define CTX_FLAG_EAP_RESTART                0x00020000
183 #define CTX_FLAG_EAP_FAIL                   0x00040000
184 #define CTX_FLAG_EAP_RESP                   0x00080000
185 #define CTX_FLAG_EAP_NO_RESP                0x00100000
186 #define CTX_FLAG_EAP_REQ                    0x00200000
187 #define CTX_FLAG_EAP_PORT_ENABLED           0x00400000
188 #define CTX_FLAG_EAP_ALT_ACCEPT             0x00800000
189 #define CTX_FLAG_EAP_ALT_REJECT             0x01000000
190 #define CTX_FLAG_EAP_MASK                   0xFFFF0000
191
192 struct gss_eap_initiator_ctx {
193     unsigned int idleWhile;
194 #ifndef __cplusplus
195     struct eap_peer_config eapPeerConfig;
196     struct eap_sm *eap;
197     struct wpabuf reqData;
198 #endif
199 };
200
201 struct gss_eap_acceptor_ctx {
202     struct rs_context *radContext;
203     struct rs_connection *radConn;
204     char *radServer;
205     gss_buffer_desc state;
206     VALUE_PAIR *vps;
207 };
208
209 #ifdef HAVE_HEIMDAL_VERSION
210 struct gss_ctx_id_t_desc_struct
211 #else
212 struct gss_ctx_id_struct
213 #endif
214 {
215     GSSEAP_MUTEX mutex;
216     enum gss_eap_state state;
217     OM_uint32 flags;
218     OM_uint32 gssFlags;
219     gss_OID mechanismUsed;
220     krb5_cksumtype checksumType;
221     krb5_enctype encryptionType;
222     krb5_keyblock rfc3961Key;
223     gss_name_t initiatorName;
224     gss_name_t acceptorName;
225     time_t expiryTime;
226     uint64_t sendSeq, recvSeq;
227     void *seqState;
228     gss_cred_id_t defaultCred;
229     union {
230         struct gss_eap_initiator_ctx initiator;
231         #define initiatorCtx         ctxU.initiator
232         struct gss_eap_acceptor_ctx  acceptor;
233         #define acceptorCtx          ctxU.acceptor
234 #ifdef GSSEAP_ENABLE_REAUTH
235         gss_ctx_id_t                 kerberos;
236         #define kerberosCtx          ctxU.kerberos
237 #endif
238     } ctxU;
239 };
240
241 #define TOK_FLAG_SENDER_IS_ACCEPTOR         0x01
242 #define TOK_FLAG_WRAP_CONFIDENTIAL          0x02
243 #define TOK_FLAG_ACCEPTOR_SUBKEY            0x04
244
245 #define KEY_USAGE_ACCEPTOR_SEAL             22
246 #define KEY_USAGE_ACCEPTOR_SIGN             23
247 #define KEY_USAGE_INITIATOR_SEAL            24
248 #define KEY_USAGE_INITIATOR_SIGN            25
249
250 /* wrap_iov.c */
251 OM_uint32
252 gssEapWrapOrGetMIC(OM_uint32 *minor,
253                    gss_ctx_id_t ctx,
254                    int conf_req_flag,
255                    int *conf_state,
256                    gss_iov_buffer_desc *iov,
257                    int iov_count,
258                    enum gss_eap_token_type toktype);
259
260 OM_uint32
261 gssEapUnwrapOrVerifyMIC(OM_uint32 *minor_status,
262                         gss_ctx_id_t ctx,
263                         int *conf_state,
264                         gss_qop_t *qop_state,
265                         gss_iov_buffer_desc *iov,
266                         int iov_count,
267                         enum gss_eap_token_type toktype);
268
269 OM_uint32
270 gssEapWrapIovLength(OM_uint32 *minor,
271                     gss_ctx_id_t ctx,
272                     int conf_req_flag,
273                     gss_qop_t qop_req,
274                     int *conf_state,
275                     gss_iov_buffer_desc *iov,
276                     int iov_count);
277 OM_uint32
278 gssEapWrap(OM_uint32 *minor,
279            gss_ctx_id_t ctx,
280            int conf_req_flag,
281            gss_qop_t qop_req,
282            gss_buffer_t input_message_buffer,
283            int *conf_state,
284            gss_buffer_t output_message_buffer);
285
286 unsigned char
287 rfc4121Flags(gss_ctx_id_t ctx, int receiving);
288
289 /* display_status.c */
290 void
291 gssEapSaveStatusInfo(OM_uint32 minor, const char *format, ...);
292
293 #define IS_WIRE_ERROR(err)              ((err) > GSSEAP_RESERVED && \
294                                          (err) <= GSSEAP_RADIUS_PROT_FAILURE)
295
296 #ifdef __cplusplus
297 }
298 #endif
299
300 #endif /* _GSSAPIP_EAP_H_ */