2 Unix SMB/CIFS implementation.
3 kerberos authorization data (PAC) utility library
4 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2011
5 Copyright (C) Simo Sorce 2010.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>.
24 #include "auth/kerberos/pac_utils.h"
27 /* FIXME - need proper configure/waf test
28 * to determine if gss_mech_krb5 and friends
32 * These are not exported by Solaris -lkrb5
33 * Maybe move to libreplace somewhere?
35 static const gss_OID_desc krb5_gss_oid_array
[] = {
36 /* this is the official, rfc-specified OID */
37 { 9, "\052\206\110\206\367\022\001\002\002" },
38 /* this is the pre-RFC mech OID */
39 { 5, "\053\005\001\005\002" },
40 /* this is the unofficial, incorrect mech OID emitted by MS */
41 { 9, "\052\206\110\202\367\022\001\002\002" },
45 const gss_OID_desc
* const gss_mech_krb5
= krb5_gss_oid_array
+0;
46 const gss_OID_desc
* const gss_mech_krb5_old
= krb5_gss_oid_array
+1;
47 const gss_OID_desc
* const gss_mech_krb5_wrong
= krb5_gss_oid_array
+2;
50 #ifndef GSS_KRB5_INQ_SSPI_SESSION_KEY_OID
51 #define GSS_KRB5_INQ_SSPI_SESSION_KEY_OID_LENGTH 11
52 #define GSS_KRB5_INQ_SSPI_SESSION_KEY_OID "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02\x05\x05"
55 gss_OID_desc gse_sesskey_inq_oid
= {
56 GSS_KRB5_INQ_SSPI_SESSION_KEY_OID_LENGTH
,
57 (void *)GSS_KRB5_INQ_SSPI_SESSION_KEY_OID
60 #ifndef GSS_KRB5_SESSION_KEY_ENCTYPE_OID
61 #define GSS_KRB5_SESSION_KEY_ENCTYPE_OID_LENGTH 10
62 #define GSS_KRB5_SESSION_KEY_ENCTYPE_OID "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02\x04"
65 gss_OID_desc gse_sesskeytype_oid
= {
66 GSS_KRB5_SESSION_KEY_ENCTYPE_OID_LENGTH
,
67 (void *)GSS_KRB5_SESSION_KEY_ENCTYPE_OID
70 /* The Heimdal OID for getting the PAC */
71 #define EXTRACT_PAC_AUTHZ_DATA_FROM_SEC_CONTEXT_OID_LENGTH 8
72 /* EXTRACTION OID AUTHZ ID */
73 #define EXTRACT_PAC_AUTHZ_DATA_FROM_SEC_CONTEXT_OID "\x2a\x85\x70\x2b\x0d\x03" "\x81\x00"
75 NTSTATUS
gssapi_obtain_pac_blob(TALLOC_CTX
*mem_ctx
,
76 gss_ctx_id_t gssapi_context
,
77 gss_name_t gss_client_name
,
81 OM_uint32 gss_maj
, gss_min
;
82 #ifdef HAVE_GSS_GET_NAME_ATTRIBUTE
83 gss_buffer_desc pac_buffer
;
84 gss_buffer_desc pac_display_buffer
;
85 gss_buffer_desc pac_name
= {
86 .value
= discard_const("urn:mspac:"),
87 .length
= sizeof("urn:mspac:")-1
90 int authenticated
= false;
93 gss_maj
= gss_get_name_attribute(
94 &gss_min
, gss_client_name
, &pac_name
,
95 &authenticated
, &complete
,
96 &pac_buffer
, &pac_display_buffer
, &more
);
99 DEBUG(0, ("obtaining PAC via GSSAPI gss_get_name_attribute failed: %s\n",
100 gssapi_error_string(mem_ctx
, gss_maj
, gss_min
, gss_mech_krb5
)));
101 return NT_STATUS_ACCESS_DENIED
;
102 } else if (authenticated
&& complete
) {
103 /* The PAC blob is returned directly */
104 *pac_blob
= data_blob_talloc(mem_ctx
, pac_buffer
.value
,
107 if (!pac_blob
->data
) {
108 status
= NT_STATUS_NO_MEMORY
;
110 status
= NT_STATUS_OK
;
113 gss_maj
= gss_release_buffer(&gss_min
, &pac_buffer
);
114 gss_maj
= gss_release_buffer(&gss_min
, &pac_display_buffer
);
117 DEBUG(0, ("obtaining PAC via GSSAPI failed: authenticated: %s, complete: %s, more: %s\n",
118 authenticated
? "true" : "false",
119 complete
? "true" : "false",
120 more
? "true" : "false"));
121 return NT_STATUS_ACCESS_DENIED
;
124 #elif defined(HAVE_GSS_INQUIRE_SEC_CONTEXT_BY_OID)
125 gss_OID_desc pac_data_oid
= {
126 .elements
= discard_const(EXTRACT_PAC_AUTHZ_DATA_FROM_SEC_CONTEXT_OID
),
127 .length
= EXTRACT_PAC_AUTHZ_DATA_FROM_SEC_CONTEXT_OID_LENGTH
130 gss_buffer_set_t set
= GSS_C_NO_BUFFER_SET
;
132 /* If we didn't have the routine to get a verified, validated
133 * PAC (supplied only by MIT at the time of writing), then try
134 * with the Heimdal OID (fetches the PAC directly and always
136 gss_maj
= gss_inquire_sec_context_by_oid(
137 &gss_min
, gssapi_context
,
138 &pac_data_oid
, &set
);
140 /* First check for the error MIT gives for an unknown OID */
141 if (gss_maj
== GSS_S_UNAVAILABLE
) {
142 DEBUG(1, ("unable to obtain a PAC against this GSSAPI library. "
143 "GSSAPI secured connections are available only with Heimdal or MIT Kerberos >= 1.8\n"));
144 } else if (gss_maj
!= 0) {
145 DEBUG(2, ("obtaining PAC via GSSAPI gss_inqiure_sec_context_by_oid (Heimdal OID) failed: %s\n",
146 gssapi_error_string(mem_ctx
, gss_maj
, gss_min
, gss_mech_krb5
)));
148 if (set
== GSS_C_NO_BUFFER_SET
) {
149 DEBUG(0, ("gss_inquire_sec_context_by_oid returned unknown "
150 "data in results.\n"));
151 return NT_STATUS_INTERNAL_ERROR
;
154 /* The PAC blob is returned directly */
155 *pac_blob
= data_blob_talloc(mem_ctx
, set
->elements
[0].value
,
156 set
->elements
[0].length
);
157 if (!pac_blob
->data
) {
158 status
= NT_STATUS_NO_MEMORY
;
160 status
= NT_STATUS_OK
;
163 gss_maj
= gss_release_buffer_set(&gss_min
, &set
);
167 DEBUG(1, ("unable to obtain a PAC against this GSSAPI library. "
168 "GSSAPI secured connections are available only with Heimdal or MIT Kerberos >= 1.8\n"));
170 return NT_STATUS_ACCESS_DENIED
;
173 NTSTATUS
gssapi_get_session_key(TALLOC_CTX
*mem_ctx
,
174 gss_ctx_id_t gssapi_context
,
175 DATA_BLOB
*session_key
,
178 OM_uint32 gss_min
, gss_maj
;
179 gss_buffer_set_t set
= GSS_C_NO_BUFFER_SET
;
181 gss_maj
= gss_inquire_sec_context_by_oid(
182 &gss_min
, gssapi_context
,
183 &gse_sesskey_inq_oid
, &set
);
185 DEBUG(0, ("gss_inquire_sec_context_by_oid failed [%s]\n",
186 gssapi_error_string(mem_ctx
, gss_maj
, gss_min
, gss_mech_krb5
)));
187 return NT_STATUS_NO_USER_SESSION_KEY
;
190 if ((set
== GSS_C_NO_BUFFER_SET
) ||
192 #ifdef HAVE_GSSKRB5_GET_SUBKEY
193 krb5_keyblock
*subkey
;
194 gss_maj
= gsskrb5_get_subkey(&gss_min
,
198 DEBUG(1, ("NO session key for this mech\n"));
199 return NT_STATUS_NO_USER_SESSION_KEY
;
202 *session_key
= data_blob_talloc(mem_ctx
,
203 KRB5_KEY_DATA(subkey
), KRB5_KEY_LENGTH(subkey
));
206 *keytype
= KRB5_KEY_TYPE(subkey
);
208 krb5_free_keyblock(NULL
/* should be krb5_context */, subkey
);
211 DEBUG(0, ("gss_inquire_sec_context_by_oid didn't return any session key (and no alternative method available)\n"));
212 return NT_STATUS_NO_USER_SESSION_KEY
;
217 *session_key
= data_blob_talloc(mem_ctx
, set
->elements
[0].value
,
218 set
->elements
[0].length
);
225 if (set
->count
< 2) {
227 #ifdef HAVE_GSSKRB5_GET_SUBKEY
228 krb5_keyblock
*subkey
;
229 gss_maj
= gsskrb5_get_subkey(&gss_min
,
233 *keytype
= KRB5_KEY_TYPE(subkey
);
234 krb5_free_keyblock(NULL
/* should be krb5_context */, subkey
);
241 gss_maj
= gss_release_buffer_set(&gss_min
, &set
);
245 } else if (memcmp(set
->elements
[1].value
,
246 gse_sesskeytype_oid
.elements
,
247 gse_sesskeytype_oid
.length
) != 0) {
248 /* Perhaps a non-krb5 session key */
250 gss_maj
= gss_release_buffer_set(&gss_min
, &set
);
253 p
= set
->elements
[1].value
+ gse_sesskeytype_oid
.length
;
254 diflen
= set
->elements
[1].length
- gse_sesskeytype_oid
.length
;
256 gss_maj
= gss_release_buffer_set(&gss_min
, &set
);
257 return NT_STATUS_INVALID_PARAMETER
;
260 for (i
= 0; i
< diflen
; i
++) {
261 *keytype
= (*keytype
<< 7) | (p
[i
] & 0x7f);
262 if (i
+ 1 != diflen
&& (p
[i
] & 0x80) == 0) {
263 gss_maj
= gss_release_buffer_set(&gss_min
, &set
);
264 return NT_STATUS_INVALID_PARAMETER
;
269 gss_maj
= gss_release_buffer_set(&gss_min
, &set
);
274 char *gssapi_error_string(TALLOC_CTX
*mem_ctx
,
275 OM_uint32 maj_stat
, OM_uint32 min_stat
,
278 OM_uint32 disp_min_stat
, disp_maj_stat
;
279 gss_buffer_desc maj_error_message
;
280 gss_buffer_desc min_error_message
;
281 char *maj_error_string
, *min_error_string
;
282 OM_uint32 msg_ctx
= 0;
286 maj_error_message
.value
= NULL
;
287 min_error_message
.value
= NULL
;
288 maj_error_message
.length
= 0;
289 min_error_message
.length
= 0;
291 disp_maj_stat
= gss_display_status(&disp_min_stat
, maj_stat
,
292 GSS_C_GSS_CODE
, mech
,
293 &msg_ctx
, &maj_error_message
);
294 disp_maj_stat
= gss_display_status(&disp_min_stat
, min_stat
,
295 GSS_C_MECH_CODE
, mech
,
296 &msg_ctx
, &min_error_message
);
298 maj_error_string
= talloc_strndup(mem_ctx
,
299 (char *)maj_error_message
.value
,
300 maj_error_message
.length
);
302 min_error_string
= talloc_strndup(mem_ctx
,
303 (char *)min_error_message
.value
,
304 min_error_message
.length
);
306 ret
= talloc_asprintf(mem_ctx
, "%s: %s",
307 maj_error_string
, min_error_string
);
309 talloc_free(maj_error_string
);
310 talloc_free(min_error_string
);
312 gss_release_buffer(&disp_min_stat
, &maj_error_message
);
313 gss_release_buffer(&disp_min_stat
, &min_error_message
);
318 #endif /* HAVE_KRB5 */