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1 /*-
2  * Copyright (c) 2005 Doug Rabson
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  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  *
26  *      $FreeBSD$
27  */
28
29 #include <gssapi/gssapi.h>
30 #include <stdlib.h>
31 #include <string.h>
32 #include <errno.h>
33
34 #include "mech_switch.h"
35 #include "name.h"
36 #include "cred.h"
37 #include "context.h"
38 #include "utils.h"
39
40 static gss_cred_id_t
41 _gss_mech_cred_find(gss_cred_id_t cred_handle, gss_OID mech_type)
42 {
43         struct _gss_cred *cred = (struct _gss_cred *)cred_handle;
44         struct _gss_mechanism_cred *mc;
45
46         if (cred == NULL)
47                 return GSS_C_NO_CREDENTIAL;
48
49         SLIST_FOREACH(mc, &cred->gc_mc, gmc_link) {
50                 if (gss_oid_equal(mech_type, mc->gmc_mech_oid))
51                         return mc->gmc_cred;
52         }
53         return GSS_C_NO_CREDENTIAL;
54 }
55
56 OM_uint32
57 gss_init_sec_context(OM_uint32 * minor_status,
58     const gss_cred_id_t initiator_cred_handle,
59     gss_ctx_id_t * context_handle,
60     const gss_name_t target_name,
61     const gss_OID input_mech_type,
62     OM_uint32 req_flags,
63     OM_uint32 time_req,
64     const gss_channel_bindings_t input_chan_bindings,
65     const gss_buffer_t input_token,
66     gss_OID * actual_mech_type,
67     gss_buffer_t output_token,
68     OM_uint32 * ret_flags,
69     OM_uint32 * time_rec)
70 {
71         OM_uint32 major_status;
72         struct _gss_mech_switch *m;
73         struct _gss_name *name = (struct _gss_name *) target_name;
74         struct _gss_mechanism_name *mn;
75         struct _gss_context *ctx = (struct _gss_context *) *context_handle;
76         gss_cred_id_t cred_handle;
77         int allocated_ctx;
78         gss_OID mech_type = input_mech_type;
79
80         *minor_status = 0;
81
82         _gss_buffer_zero(output_token);
83         if (actual_mech_type)
84                 *actual_mech_type = GSS_C_NO_OID;
85         if (ret_flags)
86                 *ret_flags = 0;
87         if (time_rec)
88                 *time_rec = 0;
89
90         /*
91          * If we haven't allocated a context yet, do so now and lookup
92          * the mechanism switch table. If we have one already, make
93          * sure we use the same mechanism switch as before.
94          */
95         if (!ctx) {
96                 if (mech_type == GSS_C_NO_OID) {
97                         _gss_load_mech();
98                         if (_gss_mech_oids == GSS_C_NO_OID_SET
99                             || _gss_mech_oids->count == 0)
100                                 return (GSS_S_BAD_MECH);
101                         mech_type = &_gss_mech_oids->elements[0];
102                 }
103
104                 ctx = malloc(sizeof(struct _gss_context));
105                 if (!ctx) {
106                         *minor_status = ENOMEM;
107                         return (GSS_S_FAILURE);
108                 }
109                 memset(ctx, 0, sizeof(struct _gss_context));
110                 m = ctx->gc_mech = _gss_find_mech_switch(mech_type);
111                 if (!m) {
112                         free(ctx);
113                         return (GSS_S_BAD_MECH);
114                 }
115                 allocated_ctx = 1;
116         } else {
117                 m = ctx->gc_mech;
118                 mech_type = &ctx->gc_mech->gm_mech_oid;
119                 allocated_ctx = 0;
120         }
121
122         /*
123          * Find the MN for this mechanism.
124          */
125         major_status = _gss_find_mn(minor_status, name, mech_type, &mn);
126         if (major_status != GSS_S_COMPLETE) {
127                 if (allocated_ctx)
128                         free(ctx);
129                 return (major_status);
130         }
131
132         /*
133          * If we have a cred, find the cred for this mechanism.
134          */
135         cred_handle = _gss_mech_cred_find(initiator_cred_handle, mech_type);
136
137         major_status = m->gm_init_sec_context(minor_status,
138             cred_handle,
139             &ctx->gc_ctx,
140             mn->gmn_name,
141             mech_type,
142             req_flags,
143             time_req,
144             input_chan_bindings,
145             input_token,
146             actual_mech_type,
147             output_token,
148             ret_flags,
149             time_rec);
150
151         if (major_status != GSS_S_COMPLETE
152             && major_status != GSS_S_CONTINUE_NEEDED) {
153                 if (allocated_ctx)
154                         free(ctx);
155                 _gss_buffer_zero(output_token);
156                 _gss_mg_error(m, major_status, *minor_status);
157         } else {
158                 *context_handle = (gss_ctx_id_t) ctx;
159         }
160
161         return (major_status);
162 }