1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /*
28 * This contains miscellaneous functions moved from commands to the library.
29 */
30
31 #include "mt.h"
32 #include <stdlib.h>
33 #include <stdio.h>
34 #include <syslog.h>
35 #include <string.h>
36 #include <unistd.h>
37 #include <gssapi/gssapi.h>
38 #include <rpc/rpc.h>
39 #include <rpcsvc/nis.h>
40 #include <rpcsvc/nis_dhext.h>
41 #include <rpc/auth.h>
42 #include <rpc/auth_sys.h>
43 #include <rpc/auth_des.h>
44 #include <rpc/key_prot.h>
45 #include <netdir.h>
46 #include <netconfig.h>
47 #include <sys/socket.h>
48 #include <netinet/in.h>
49 #include <netdb.h>
50 #include <dlfcn.h>
51 #include <gssapi/gssapi.h>
52
53 extern int bin2hex(int len, unsigned char *binnum, char *hexnum);
54 extern int hex2bin(int len, char *hexnum, char *binnum);
55
56 #define MECH_LIB_PREFIX1 "/usr/lib/"
57
58 #ifdef _LP64
59
60 #define MECH_LIB_PREFIX2 "64/"
61
62 #else /* _LP64 */
63
64 #define MECH_LIB_PREFIX2 ""
65
66 #endif /* _LP64 */
67
68 #define MECH_LIB_DIR "gss/"
69
70 #define MECH_LIB_PREFIX MECH_LIB_PREFIX1 MECH_LIB_PREFIX2
71
72 #define MECHDH MECH_LIB_PREFIX MECH_LIB_DIR "mech_dh.so.1"
73 #define LIBGSS MECH_LIB_PREFIX "libgss.so.1"
74
75 static gss_OID_desc __dh_gss_c_nt_netname = {
76 9, "\053\006\004\001\052\002\032\001\001"
77 };
78
79 mutex_t gss_load_lock = DEFAULTMUTEX;
80 static gss_OID GSS_EXPORT_NAME = 0;
81 static gss_OID DH_NETNAME = &__dh_gss_c_nt_netname;
82
83 typedef OM_uint32 (*gss_fptr)();
84 OM_uint32 (*g_import_name)();
85 OM_uint32 (*g_display_name)();
86 OM_uint32 (*g_release_name)();
87 OM_uint32 (*g_release_buffer)();
88 OM_uint32 (*g_release_oid)();
89
90 /*
91 * gss_OID_load()
92 *
93 * This routine is called by __nis_gssprin2netname to define values for
94 * the gss-api-export-name OID, the Diffie-Hellman netname OID, and
95 * the gss support routines that it needs.
96 * The reason for this support routine is that libnsl cannot have an
97 * explicit dependency on libgss. Callers of __nisgssprin2netname are
98 * expected to have loaded libgss through the rpcsec layer. The work around
99 * is to dlopen the needed shared objects and grab the symbols with dlsym.
100 * This routine opens libgss RTLD_NOLOAD. If this fails then libgss.so.1
101 * is not loaded and we return error. Otherwise it uses dlsym to
102 * defines GSS_EXPORT_NAME to have the value of GSS_C_NT_EXPORT_NAME and
103 * to assign the above fuction pointers.
104 * If this succeeds then the routine will attempt to load mech_dh.so.1
105 * and over ride DH_NETNAME with the value of __DH_GSS_C_NT_NETNAME from
106 * that shared object. We don't consider it an error if this fails because
107 * its conceivable that another mechanism backend will support the netname
108 * name type and mech_dh.so.1 not be available.
109 *
110 * Return 0 on failer, 1 on success.
111 */
112
113 static int
gss_OID_load()114 gss_OID_load()
115 {
116 void *dh;
117 gss_OID *OIDptr;
118 int stat = 0;
119
120 (void) mutex_lock(&gss_load_lock);
121 if (GSS_EXPORT_NAME) {
122 (void) mutex_unlock(&gss_load_lock);
123 return (0);
124 }
125
126 /* if LIBGSS is not loaded return an error */
127 if ((dh = dlopen(LIBGSS, RTLD_NOLOAD)) == NULL) {
128 (void) mutex_unlock(&gss_load_lock);
129 return (0);
130 }
131
132 OIDptr = (gss_OID *)dlsym(dh, "GSS_C_NT_EXPORT_NAME");
133 if (OIDptr)
134 GSS_EXPORT_NAME = *OIDptr;
135 else
136 goto Done;
137
138 g_import_name = (gss_fptr)dlsym(dh, "gss_import_name");
139 if (g_import_name == 0)
140 goto Done;
141
142 g_display_name = (gss_fptr)dlsym(dh, "gss_display_name");
143 if (g_display_name == 0)
144 goto Done;
145
146 g_release_name = (gss_fptr)dlsym(dh, "gss_release_name");
147 if (g_release_name == 0)
148 goto Done;
149
150 g_release_buffer = (gss_fptr)dlsym(dh, "gss_release_buffer");
151 if (g_release_buffer == 0)
152 goto Done;
153
154 g_release_oid = (gss_fptr)dlsym(dh, "gss_release_oid");
155 if (g_release_oid == 0)
156 goto Done;
157
158 stat = 1;
159 /*
160 * Try and get the official netname oid from mech_dh.so.
161 * If this fails will just keep our default from above.
162 */
163
164 if ((dh = dlopen(MECHDH, RTLD_LAZY)) != NULL) {
165
166 OIDptr = (gss_OID *)dlsym(dh, "__DH_GSS_C_NT_NETNAME");
167 if (OIDptr)
168 DH_NETNAME = *OIDptr;
169 }
170
171 Done:
172 (void) mutex_unlock(&gss_load_lock);
173
174 if (stat == 0)
175 GSS_EXPORT_NAME = 0;
176
177 return (stat);
178 }
179
180
181 /*
182 * int
183 * __nis_gssprin2netname(rpc_gss_principal_t prin,
184 * char netname[MAXNETNAMELEN+1])
185 *
186 * This routine attempts to extract the netname from an rpc_gss_principal_t
187 * which is in { gss-api-exorted-name } format. Return 0 if a netname was
188 * found, else return -1.
189 */
190
191 /*
192 * This routine has a dependency on libgss.so. So we will pragma weak
193 * the interfaces that we need. When this routine is called libgss
194 * should have been loaded by the rpcsec layer. We will call gss_OID_load
195 * to get the value for GSS_EXPORT_NAME. If gss_OID_load failes return -1.
196 */
197
198 #define OID_IS_EQUAL(o1, o2) ((o1) && (o2) && \
199 ((o1)->length == (o2)->length) && \
200 (memcmp((o1)->elements, (o2)->elements, (o1)->length) == 0))
201
202 int
__nis_gssprin2netname(rpc_gss_principal_t prin,char netname[])203 __nis_gssprin2netname(rpc_gss_principal_t prin, char netname[])
204 {
205 gss_buffer_desc display_name;
206 gss_name_t name;
207 gss_OID name_type;
208 gss_buffer_desc expName;
209 int stat = -1;
210 OM_uint32 major, minor;
211
212 /* See if we already got the OID */
213 if (GSS_EXPORT_NAME == 0) {
214 /* Nope. See if GSS is loaded and get the OIDs */
215 if (!gss_OID_load())
216 return (-1); /* if libgss.so.1 isn't loaded */
217 }
218
219 expName.length = prin->len;
220 expName.value = prin->name;
221
222 major = (*g_import_name)(&minor, &expName,
223 (gss_OID) GSS_EXPORT_NAME, &name);
224
225 if (major == GSS_S_COMPLETE) {
226 major = (*g_display_name)(&minor, name,
227 &display_name, &name_type);
228
229 /* We're done with the gss_internal name */
230 (void) (*g_release_name)(&minor, &name);
231
232 if (major == GSS_S_COMPLETE) {
233 /*
234 * Check if we've got a netname. If we do we copy it
235 * and make sure that its null terminated.
236 */
237 if (OID_IS_EQUAL(DH_NETNAME, name_type)) {
238 (void) strncpy(netname,
239 (char *)display_name.value,
240 MAXNETNAMELEN);
241 netname[MAXNETNAMELEN] = '\0';
242 stat = 0;
243 }
244 /*
245 * If there are other display formats that can
246 * be converted to netnames easily, insert here.
247 *
248 * else if (OID_IS_EQUAL(OTHER_NT_OID, name_type)) {
249 * convert2netname(display_name.value, netname);
250 * } ...
251 */
252
253 /* Release temporty storage */
254 (void) (*g_release_buffer)(&minor, &display_name);
255 (void) (*g_release_oid)(&minor, &name_type);
256 }
257 }
258
259 if (stat == 0)
260 return (stat);
261
262 return (stat);
263 }
264
265 /*
266 * Extract a public key given a key length and alg. type from a packed
267 * netobj containing extended Diffie-Hellman keys.
268 */
269 char *
__nis_dhext_extract_pkey(netobj * no,keylen_t keylen,algtype_t algtype)270 __nis_dhext_extract_pkey(netobj *no, keylen_t keylen, algtype_t algtype)
271 {
272 char *hexkey;
273 /* LINTED pointer cast */
274 extdhkey_t *keyent = (extdhkey_t *)no->n_bytes;
275
276 /* LINTED pointer cast */
277 while (keyent < (extdhkey_t *)(no->n_bytes + no->n_len)) {
278 char *keyoffset;
279 size_t binlen = (ntohs(keyent->keylen) + 7) / 8;
280 size_t binpadlen = ((binlen + 3) / 4) * 4;
281 size_t hexkeylen = binlen * 2 + 1;
282
283 if (keylen == ntohs(keyent->keylen) &&
284 algtype == ntohs(keyent->algtype)) {
285
286 if (!(hexkey = malloc(hexkeylen)))
287 return (NULL);
288
289 (void) bin2hex(binlen, keyent->key, hexkey);
290 return (hexkey);
291 }
292 keyoffset = (char *)keyent + (sizeof (ushort_t) * 2) +
293 binpadlen;
294 /* LINTED pointer cast */
295 keyent = (extdhkey_t *)keyoffset;
296 }
297 return (NULL);
298 }
299