Line data Source code
1 : /*-
2 : * Copyright (c) 2005 Doug Rabson
3 : * All rights reserved.
4 : *
5 : * Portions Copyright (c) 2009 Apple Inc. All rights reserved.
6 : *
7 : * Redistribution and use in source and binary forms, with or without
8 : * modification, are permitted provided that the following conditions
9 : * are met:
10 : * 1. Redistributions of source code must retain the above copyright
11 : * notice, this list of conditions and the following disclaimer.
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 : * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 : * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 : * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 : * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 : * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 : * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 : * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 : * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 : * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 : * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 : * SUCH DAMAGE.
27 : *
28 : * $FreeBSD: src/lib/libgssapi/gss_init_sec_context.c,v 1.1 2005/12/29 14:40:20 dfr Exp $
29 : */
30 :
31 : #include "mech_locl.h"
32 :
33 : gss_cred_id_t
34 47850 : _gss_mg_find_mech_cred(
35 : gss_const_cred_id_t cred_handle,
36 : gss_const_OID mech_type)
37 : {
38 47850 : struct _gss_cred *cred = (struct _gss_cred *)cred_handle;
39 1915 : struct _gss_mechanism_cred *mc;
40 :
41 47850 : if (cred == NULL)
42 42 : return GSS_C_NO_CREDENTIAL;
43 :
44 47808 : HEIM_TAILQ_FOREACH(mc, &cred->gc_mc, gmc_link) {
45 47808 : if (gss_oid_equal(mech_type, mc->gmc_mech_oid))
46 47808 : return mc->gmc_cred;
47 : }
48 0 : return GSS_C_NO_CREDENTIAL;
49 : }
50 :
51 : static void
52 0 : log_init_sec_context(struct _gss_context *ctx,
53 : struct _gss_name *target,
54 : OM_uint32 req_flags,
55 : struct _gss_cred *cred,
56 : gss_OID mech_type,
57 : gss_buffer_t input_token)
58 : {
59 0 : gssapi_mech_interface m;
60 :
61 0 : if (ctx)
62 0 : m = ctx->gc_mech;
63 : else
64 0 : m = __gss_get_mechanism(mech_type);
65 0 : if (m == NULL)
66 0 : return;
67 :
68 0 : mech_type = &m->gm_mech_oid;
69 :
70 0 : _gss_mg_log(1, "gss_isc: %s %sfirst flags %08x, %s cred, %stoken",
71 : m->gm_name,
72 : (ctx == NULL) ? "" : "not ",
73 : req_flags,
74 : (cred != NULL) ? "specific" : "default",
75 0 : (input_token != NULL && input_token->length) ? "" : "no ");
76 :
77 0 : _gss_mg_log_cred(1, cred, "gss_isc cred");
78 :
79 : /* print target name */
80 0 : _gss_mg_log_name(1, target, mech_type, "gss_isc: target");
81 : }
82 :
83 : /**
84 : * As the initiator build a context with an acceptor.
85 : *
86 : * Returns in the major
87 : * - GSS_S_COMPLETE - if the context if build
88 : * - GSS_S_CONTINUE_NEEDED - if the caller needs to continue another
89 : * round of gss_i nit_sec_context
90 : * - error code - any other error code
91 : *
92 : * @param minor_status minor status code.
93 : *
94 : * @param initiator_cred_handle the credential to use when building
95 : * the context, if GSS_C_NO_CREDENTIAL is passed, the default
96 : * credential for the mechanism will be used.
97 : *
98 : * @param context_handle a pointer to a context handle, will be
99 : * returned as long as there is not an error.
100 : *
101 : * @param target_name the target name of acceptor, created using
102 : * gss_import_name(). The name is can be of any name types the
103 : * mechanism supports, check supported name types with
104 : * gss_inquire_names_for_mech().
105 : *
106 : * @param input_mech_type mechanism type to use, if GSS_C_NO_OID is
107 : * used, Kerberos (GSS_KRB5_MECHANISM) will be tried. Other
108 : * available mechanism are listed in the @ref gssapi_mechs_intro
109 : * section.
110 : *
111 : * @param req_flags flags using when building the context, see @ref
112 : * gssapi_context_flags
113 : *
114 : * @param time_req time requested this context should be valid in
115 : * seconds, common used value is GSS_C_INDEFINITE
116 : *
117 : * @param input_chan_bindings Channel bindings used, if not exepected
118 : * otherwise, used GSS_C_NO_CHANNEL_BINDINGS
119 : *
120 : * @param input_token input token sent from the acceptor, for the
121 : * initial packet the buffer of { NULL, 0 } should be used.
122 : *
123 : * @param actual_mech_type the actual mech used, MUST NOT be freed
124 : * since it pointing to static memory.
125 : *
126 : * @param output_token if there is an output token, regardless of
127 : * complete, continue_needed, or error it should be sent to the
128 : * acceptor
129 : *
130 : * @param ret_flags return what flags was negotitated, caller should
131 : * check if they are accetable. For example, if
132 : * GSS_C_MUTUAL_FLAG was negotiated with the acceptor or not.
133 : *
134 : * @param time_rec amount of time this context is valid for
135 : *
136 : * @returns a gss_error code, see gss_display_status() about printing
137 : * the error code.
138 : *
139 : * @ingroup gssapi
140 : */
141 :
142 :
143 :
144 : GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
145 47850 : gss_init_sec_context(OM_uint32 * minor_status,
146 : gss_const_cred_id_t initiator_cred_handle,
147 : gss_ctx_id_t * context_handle,
148 : gss_const_name_t target_name,
149 : const gss_OID input_mech_type,
150 : OM_uint32 req_flags,
151 : OM_uint32 time_req,
152 : const gss_channel_bindings_t input_chan_bindings,
153 : const gss_buffer_t input_token,
154 : gss_OID * actual_mech_type,
155 : gss_buffer_t output_token,
156 : OM_uint32 * ret_flags,
157 : OM_uint32 * time_rec)
158 : {
159 1915 : OM_uint32 major_status;
160 1915 : gssapi_mech_interface m;
161 47850 : gss_const_name_t mn_inner = GSS_C_NO_NAME;
162 47850 : struct _gss_name *name = (struct _gss_name *) target_name;
163 1915 : struct _gss_mechanism_name *mn;
164 47850 : struct _gss_context *ctx = (struct _gss_context *) *context_handle;
165 1915 : gss_const_cred_id_t cred_handle;
166 1915 : int allocated_ctx;
167 47850 : gss_OID mech_type = input_mech_type;
168 :
169 47850 : *minor_status = 0;
170 :
171 47850 : _mg_buffer_zero(output_token);
172 47850 : if (actual_mech_type)
173 44387 : *actual_mech_type = GSS_C_NO_OID;
174 47850 : if (ret_flags)
175 47850 : *ret_flags = 0;
176 47850 : if (time_rec)
177 47808 : *time_rec = 0;
178 :
179 47850 : if (mech_type == GSS_C_NO_OID)
180 0 : mech_type = GSS_KRB5_MECHANISM;
181 :
182 47850 : _gss_mg_check_name(target_name);
183 :
184 47850 : if (_gss_mg_log_level(1))
185 0 : log_init_sec_context(ctx, name, req_flags,
186 : (struct _gss_cred *)initiator_cred_handle,
187 : input_mech_type, input_token);
188 :
189 : /*
190 : * If we haven't allocated a context yet, do so now and lookup
191 : * the mechanism switch table. If we have one already, make
192 : * sure we use the same mechanism switch as before.
193 : */
194 47850 : if (!ctx) {
195 24237 : ctx = malloc(sizeof(struct _gss_context));
196 24237 : if (!ctx) {
197 0 : *minor_status = ENOMEM;
198 0 : return (GSS_S_FAILURE);
199 : }
200 24237 : memset(ctx, 0, sizeof(struct _gss_context));
201 24237 : m = ctx->gc_mech = __gss_get_mechanism(mech_type);
202 24237 : if (!m) {
203 0 : free(ctx);
204 0 : *minor_status = 0;
205 0 : gss_mg_set_error_string(mech_type, GSS_S_BAD_MECH,
206 : *minor_status,
207 : "Unsupported mechanism requested");
208 0 : return (GSS_S_BAD_MECH);
209 : }
210 23202 : allocated_ctx = 1;
211 : } else {
212 23613 : m = ctx->gc_mech;
213 23613 : mech_type = &ctx->gc_mech->gm_mech_oid;
214 23613 : allocated_ctx = 0;
215 : }
216 :
217 : /*
218 : * Find the MN for this mechanism.
219 : */
220 47850 : if ((m->gm_flags & GM_USE_MG_NAME)) {
221 0 : mn_inner = target_name;
222 : } else {
223 47850 : major_status = _gss_find_mn(minor_status, name, mech_type, &mn);
224 47850 : if (major_status != GSS_S_COMPLETE) {
225 0 : if (allocated_ctx)
226 0 : free(ctx);
227 0 : return major_status;
228 : }
229 47850 : if (mn)
230 47850 : mn_inner = mn->gmn_name;
231 : }
232 :
233 : /*
234 : * If we have a cred, find the cred for this mechanism.
235 : */
236 47850 : if (m->gm_flags & GM_USE_MG_CRED)
237 0 : cred_handle = initiator_cred_handle;
238 : else
239 47850 : cred_handle = _gss_mg_find_mech_cred(initiator_cred_handle, mech_type);
240 :
241 47850 : if (initiator_cred_handle != GSS_C_NO_CREDENTIAL &&
242 1915 : cred_handle == NULL) {
243 0 : *minor_status = 0;
244 0 : if (allocated_ctx)
245 0 : free(ctx);
246 0 : gss_mg_set_error_string(mech_type, GSS_S_UNAVAILABLE,
247 : *minor_status,
248 : "Credential for the requested mechanism "
249 : "not found in credential handle");
250 0 : return GSS_S_UNAVAILABLE;
251 : }
252 :
253 47850 : major_status = m->gm_init_sec_context(minor_status,
254 : cred_handle,
255 : &ctx->gc_ctx,
256 : mn_inner,
257 : mech_type,
258 : req_flags,
259 : time_req,
260 : input_chan_bindings,
261 : input_token,
262 : actual_mech_type,
263 : output_token,
264 : ret_flags,
265 : time_rec);
266 :
267 47850 : if (major_status != GSS_S_COMPLETE
268 23202 : && major_status != GSS_S_CONTINUE_NEEDED) {
269 25 : if (allocated_ctx)
270 25 : free(ctx);
271 25 : _mg_buffer_zero(output_token);
272 25 : _gss_mg_error(m, *minor_status);
273 : } else {
274 47825 : *context_handle = (gss_ctx_id_t) ctx;
275 : }
276 :
277 47850 : _gss_mg_log(1, "gss_isc: %s maj_stat: %d/%d",
278 47850 : m->gm_name, (int)major_status, (int)*minor_status);
279 :
280 47850 : return (major_status);
281 : }
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